User Manual OCTOPUS-OFFICE SHIP MOTION ANALYSIS SOFTWARE

OCTOPUS Office User Manual

Software version 6.1.6 Date: 2010-09-29

© Copyright 2007 – AMARCON BV

OCTOPUS Office 6User Manual

Status: Version 6.0.1

Date: September 2010




CONTENTS

1. DEFINITIONS ..................................................................................................................................41.1. Definition Coordinate System.......................................................................................................41.2. Definition Heading .........................................................................................................................41.3. Definition Statistical Operators ....................................................................................................5

2. INTRODUCTION OCTOPUS OFFICE. ...........................................................................................62.1. OCTOPUS-OFFICE 6 Modules. .....................................................................................................7

3. INTRODUCTION TO THE USER GUIDE........................................................................................83.1. Projects ...........................................................................................................................................8

3.1.1. Create New Project ...................................................................................................................83.1.2. Open Existing Project ................................................................................................................93.1.3. Using the Workspace ................................................................................................................9

3.2. Tools ............................................................................................................................................93.2.1. 2D Hull Modeller ........................................................................................................................93.2.2. 3D Hull Modeller ......................................................................................................................113.2.3. Create 2d CHDB (Compiled Hydrodynamic Database) ..........................................................12

3.3. Introduction Common ..............................................................................................................143.3.1. Wave Scatter diagram .............................................................................................................143.3.2. Sea States. ..............................................................................................................................163.3.3. Voyages...................................................................................................................................19

3.4. Introduction Compiled Hydrodynamic Database (CHDB) ....................................................193.4.1. Create CHDB (Compiled Hydrodynamic Database) ...............................................................203.4.2. Add CHDB (Compiled Hydrodynamic Database)....................................................................213.4.3. View CHDB (Compiled Hydrodynamic Database). .................................................................22

3.5. Introduction Working with RAO's ...........................................................................................263.5.1. Prepare RAO Calculation ........................................................................................................27

3.5.1.1. Configure RAO..................................................................................................................273.5.1.2. Define Loading Condition..................................................................................................343.5.1.3. Define External Condition .................................................................................................37

3.5.2. Calculate / View RAO ..............................................................................................................423.5.3. Export to Seaway results.........................................................................................................44

3.6. Statistics ....................................................................................................................................453.6.1. Configure Statistics Responses...............................................................................................453.6.2. Sea States ...............................................................................................................................463.6.3. Scatter Diagrams.....................................................................................................................503.6.4. W3C Wave Database ..............................................................................................................54

4. QUICK GUIDE ...............................................................................................................................59

5. FREQUENTLY ASKED QUESTIONS ...........................................................................................69




© 2008 Amarcon B.V. All rights reserved. No portion of the contents of this publication may be reproduced or transmitted in any form or by any means without the express written permission of Amarcon B.V.

For more information on OCTOPUS Office, see http://www.amarcon.com

Contact details AMARCON BV

Address: Korenstraat 377722 RS DalfsenThe Netherlands

Phone: +31-(0)529-436876

Fax: +31-(0)529-436842

E-mail: [email protected]

Internet: www.amarcon.com




1. DEFINITIONS

1.1. Definition Coordinate System

All the coordinates are defined relative to a coordinate system with: x-axis pointing to bow y-axis pointing to Portside z-axis pointing upward

Origin x=0 at APP (Aft Perpendicular) Origin y=0 at CL (Centerline) Origin z=0 at BL (Baseline)

See Also:

Definition Heading Definition Statistical Operators

1.2. Definition Heading

There are two definitions for directions in OCTOPUS-Office. In general all directions are relative to the vessel. But in case of performing a voyage analysis all directions are relative to north.

In general all headings are defined relative to the vessel. The direction of approaching waves is in this case 180 degrees.

An exception is made in W3C Calculation, where the directions of waves are relative to north.




See Also:

Definition Coordinate System Definition Statistical Operators Envelopes sea state statistics

1.3. Definition Statistical Operators

In the statistical analyses it is assumed that the responses are linear or Gaussian, and that the extremes follow a Rayleigh probability distribution. From this the following relations can be derived:

Spectral moments:The spectral moments of the responses are the basis Spectral moments of the responses are calculated as follows:

Where is the response spectrum, omega the radian frequency and beta the wave direction. A special case is m0 which is the spectral moment or variance of the response.

Zero-upcrossing period.The zero-upcrossing period is defined as the:

Significant single amplitudeThe significant amplitude of a response is given by:

Significant double amplitudeThe significant double amplitude of a response is given by:

MaximumThe maximum is defined as the Most Probable Extreme (MPE), given by

where t is the reference period of a sea state, in seconds, typically 3 hours or 10400 seconds. This reference period can be defined by the user.

Rayleigh distributionThe probability density of the amplitudes, a, and its cumulative probability (or probability distribution) follow the Rayleigh density and distribution. This can be written as:




See Also:

Definition Coordinate System Definition Heading

2. INTRODUCTION OCTOPUS OFFICE.

Because of the complexity and value of marine transports and operations at sea, it is not only required but also beneficial to carry out dedicated motion analyses. The results of such an analysis are primarily required during the transport preparation phase, from quotation to the design and engineering of the stowage plan, cribbing and sea fastenings. Traditionally, marine transports are engineered to satisfy design criteria in terms of allowable wave heights. The 'Allowable wave height' can be calculated as the 'Allowable response level' divided by the 'Response level per unit wave height'. It follows that different responses may result in different allowable wave heights, depending on the allowable response level.

It is obvious that the allowable wave height also depends on the other wave parameters, like the wave period, spectrum shape and spreading.

Operational parameters like the vessel heading and vessel speed may have a large effect on the response level in a certain sea state, and thus on the allowable wave height. The same applies for the vessel's voyage plan. That's why weather routing is commonly applied. In general favorable wave headings for roll are unfavorable headings for pitch and the related accelerations. Detailed knowledge about the vessel's seakeeping behavior makes it possible to do more advanced weather routing, namely by evaluating and optimizing for ship responses in the forecasted weather (=waves).

In fact we are not talking about one allowable wave height, but about many allowable response levels. Each allowable response level implies a related allowable wave height, which again may depend on wave heading etc. This results in a "minimum allowable wave height". A balanced design of for example sea fastenings should therefore be based on the calculation of the expected levels of the relevant responses in the most likely wave environment

The analysis sequence as applied in Octopus Office is shown in Figure 1. The obtained design values may serve as the criteria which should not be exceeded during the transport or operation. The calculated models and design values can be used in Octopus Onboard, which give onboard operational support using the same methods and results as used in design value calculation procedure




2.1. OCTOPUS-OFFICE 6 Modules.

OCTOPUS-OFFICE 6 is available in different modules, depending on the license:

OCTOPUS-OFFICE 6 "BASIC"OCTOUS-OFFICE 6 "BASIC" is used to calculate the transfer functions of ship responses in waves (absolute and relative motions, velocities, accelerations, hull girder loads and linear combinations of responses).

The program has a built-in geometry-modeler to prepare 2D- and 3D-models as input for the hydrodynamic calculations (2D-strip theory or a 3D-diffraction database can be used). Nonlinear sea state dependent transfer functions are solved by means of stochastic linearization. The program features extensive possibilities for graphical and textual reporting and presentation, including export functions to MS Word and Excel.

EXTENSION "STATISTICS"The extension "STATISTICS" is used to calculate short- and long-term response statistics in arbitrary wave environments; including environment modeling tools (from single parametric sea state to fully-directional wave spectra; editable route- or site-specific scatter diagrams, multi-directional seas).Single response statistics (most probable maxima, significant values, out-crossing statistics, etc), envelope curves or workability in scatter diagrams is just a selection of the quantities that can be analyzed.

EXTENSION "W3C"More elaborate voyage-specific seakeeping analyses can be carried out when time series of waves are available. Using spectral data instead of derived wave parameters such as significant wave height, mean direction or zero-upcrossing period, ensures more accurate results, especially in multi-directional seas. Moreover, persistency effects are automatically included.

Using "W3C" voyage simulations can be carried out by using the Argoss w3c-database (www.argoss.nl). This historical world-wide wave database is the product of satellite observations and a 3rd generation




wave model. It covers a period of 15 years with a time resolution of 3 hours. The wave condition at a particular date, time and location is described by a distribution of the energy, the direction and the directionality, as a function of the frequency. The position list of an indicative voyage can be used as input for voyage simulations. The simulations are carried out for different dates and time of departure, and repeated until convergence is obtained after 'N' simulations.

See Also:

Definition Coordinate System

3. INTRODUCTION TO THE USER GUIDE

The User Guide contains the following information: Explanation of the different items:

Projects Tools Common Compiled Hydrodynamic Databases (CHDB) RAO’s Statistics

3.1. Projects

3.1.1. Create New Project

1. Start OCTOPUS Office2. To create a new project, click File, New...

Type a new name at 'Project Name'.Because OCTOPUS Office registers projects by name, use a unique name for each project.

Type a new description at 'Project Description'.

'Location' specifies the directory where the new project is located.Type a path or select one by using the browse button to the right of the 'Location' box.

3. Click OK to create the project.

See Also:

Open Existing Project Using the Workspace




3.1.2. Open Existing Project

1. Start OCTOPUS Office2. To open an existing project, click File, Open... or select a project from the Recent File List

See Also:

Create New Project Using the Workspace

3.1.3. Using the Workspace

The OCTOPUS Office workspace has two areas as shown in the picture below:

The left area is used to display the project tree; the right area is used to hold the opened documents.The project tree consists of calculation results done by the user and one folder with common used files such as Voyages, Sea States and Scatter Diagrams.

Open the items in the left area by right mouse click.

The selected item in the right plane is marked bold in the left plane.

An item becomes red if the conditions for a calculation have been changed. In that case the calculation has to be calculated and saved again before the item becomes black again.

3.2. Tools

3.2.1.2 D Hull Modeller

To open the 2D Hull Modeller, click Tools, 2D Hull Modeller...




A set of hulls is available within Octopus Office. By saving an hull under a different file name and scaling the main dimensions it is possible to define a hull by the user. Frames can be added, removed or changed, click Edit,...

The hull file can be saved in a normalized hull file, click File, Save Normalized Hull File as..A normalized hull file is made non-dimensional, in such a way that it has a length, a breadth and a draught of 1.00 meter. Then - to obtain its actual dimensions again - these normalized hull forms are resized by using the numerical values of L, B and d as scale factors at the end of the hull form data file.

See Also:

3D Hull Modeller Create 2D CHDB




3.2.2. 3D Hull Modeller

To open the 3D Hull Modeller, click Tools, 3D Hull Modeller...

To create a CHDB-file a grid file is needed. This can be done with the 3D Hull Modeler: Below the steps are described which are needed to create a grid file (*.glv)

Open the hull file, click File, Open and select the *.hul file. Create a mesh, click Geometry, Mesh. The following

dialog appears:

o 'Draft Aft': Fill in draft Aft o 'Draft Forward': Fill in draft Forwardo 'Baseline': Fill in the position of the baseline in the

coordinate system in which the hull file is specified. For the Amarcon hull files this is 0.

o 'No Parts Longitudinal': Fill in the required number of parts

o 'No Parts Girthwise': Fill in the required number of parts

o Click button OK to create the mesh. Check if the (0,0,0) position is equal to (APP,CL,BL). If so,

Save the mesh as a *.glv file: Click File, Save as.. and save the file as *.glv file.If the (0,0,0) position is not equal to (APP,CL,BL), use the translate function to translate the origin to the required

location. Click Geometry, Translate.




To view the hull: o Left mouse pressed and move the mouse to change the position of the hull. o Right mouse pressed and move the mouse to rotate the hull. o Left and Right mouse pressed and move the mouse to zoom in or out.

See Also:

2D Hull Modeller Create 2D CHDB

3.2.3. Create 2d CHDB (Compiled Hydrodynamic Database)

To create a 2D- CHDB, click Tools, Create 2D CHDB...An Hull and Grid file should be available. These files can be created with 2D Hull Modeler and 3D Hull Modeler

'Hull file' specifies the location of the hull file. To select a location, click button Browse. The Hull Browser is opened, within the Hull Browser one gets a view of the hull. Click again button Browse in the Hull Browser to select a different location. Finally click button Open in the Hull Browser.

'Grid file' specifies the location of the grid file.




'Name' Type the name of the vessel and eventually a description.

'Water depth' Specifies the water depth for which the CHDB will be calculated. 'X-position of 0-point relative to APP' specifies the longitudinal position which is the reference

point for wave forces calculation. Phase of a wave is the phase with respect to this point. 'No. of headings' Enter the number of headings used for CHDB calculation. The heading

resolution is 180 degree divided by the number of headings. A number of 19 gives a 10 degree resolution in the calculated CHDB.

The minimum and maximum values are calculated from the hull file, but can also be entered manually.

'Solution method' Select the required solution method. See Octopus Seaway Theory at www.amarcon.com/support/documentation for more information.

'CHDB file' type the name and the location of the CHDB file which will be created after clicking button Create.

To change the Draft Settings select the Draft tab.(The settings for Speed and Heading are done in the same way.)

Default the minimum and maximum draft value are calculated from the hull file. To define a range of drafts change 'No. of Drafts', 'Minimum Draft' and 'Maximum Draft" and click on Use. It is also possible to define a range of draft values manually.

See Also:

Introduction CHDB Add CHDB 2D Hull Modeller




3D Hull Modeller

3.3. Introduction Common

Under ‘Common’ data is stored is not related to one particular ship. Typically this data describes in some way the wave environment. Either by means of a voyage, which can be matched in space and time with a wave climate database, or by a scatter diagram, or simply a set of design sea states.

See Also:

Wave Scatter Diagram Sea States Voyages

3.3.1. Wave Scatter diagram

Browse in the project tree to 'Scatter Diagrams' (via Common) Create a new scatter diagram by right mouse click Create and type the name of the new scatter diagramAdd an existing scatter diagram by right mouse click Add and browse to the existing scatter diagram

A wave scatter diagram shows the probability for a wave combination of Hs and Tz. The scatter diagram is used for statistical analysis. The following spectra definitions are available:- Neumann- Bretschneider (equals Pierson-Moskowitz)- Jonswap

The spectrum spreading is defined as a cosinen function, where n is the number entered at 'Spreading'

The scatter diagram can be created in different ways:- Manually, by entering numbers in the particular grid field. - From different databases, click Scatter DB see Wave Scatter from database

Change the settings of the grid by entering button Settings. Be careful, changing the grid settings will clear the actual scatter diagram! see Wave Scatter Grid Settings

See Also:




Wave Scatter from database Wave Scatter Grid Settings

Wave Scatter Grid Settings.

To change the grid settings for Hs and Tz, enter the required numbers in the particular fields. Be careful, changing the grid settings will clear the actual scatter diagram!

See Also:

Wave Scatter Diagram

Get scatter data from database.To select data from a scatter database:

Select the required Scatter Database in the field 'Scatter database' Select a voyage or select areas manually in the map. (select multiple areas by holding the <ctrl>

key pressed)

When a voyage is selected, the weights for the different areas are created automatically. When necessary, these weights can be adjusted. See Voyages how to create a voyage.




See Also:

Wave Scatter Diagram

3.3.2. Sea States.

- Browse in the project tree to 'Sea States' (via Common)- Add an existing sea state by right mouse click Add and browse to the existing sea state.- Create a new sea state by right mouse click Create and type the name of the new sea state.




A sea state consists out of 1 or 2 wave systems, where the second wave system is defined with an angle with respect to the first wave system. Typical use of 2 wave systems is when a combination of sea and swell should by applied.

Different spectra are implemented:

Bretschneider (equals Pierson-Moskowitz) Jonswap Neumann

The period definition is either Peak Period (Tp) or Zero Crossing Period (Tz)

Generate a sea state by entering numbers manually, or generate a range of sea states by clicking button Define Sea States.

See Also:

Define Range of Sea States Import Sea States

Define Range of Sea States.

The range of sea states can be generated for:

Constant Steepness Constant wave height Constant wave height according to Noble Denton Definition

See Also:

Sea States Import Sea States

Import Sea States




To import a sea states file:

Right click at 'Sea States' in the tree at Common.

Choose Import from the menu. Type the name of the sea states

file. Browse to a 3rd party sea states

file. Select the type of decoder. Click OK

See Also:

Sea States Define Range of Sea States




3.3.3. Voyages

- A voyage is created by clicking on a specific location while holding the <ctrl> key pressed. Once a waypoint is generated its position can be changed by changing the values in the fields 'Latitude' and 'Longitude' manually.- Assign a specific port to a waypoint by clicking button Port List.- Change the layout of the map by clicking 'Map Options'.

- Enter tab 'Track' in the Map Options screen to change the default values for the voyage.The speed at a specific waypoint can also be changed manually by changing the number in field 'Speed (kn)'

See also:

Wave Scatter from database

3.4. Introduction Compiled Hydrodynamic Database (CHDB)

In OCTOPUS, a hydrodynamic analysis starts with the calculation of a hydrodynamic database. This database does not depend on the loading condition. The procedure is as follows:

At first a detailed hydrodynamic database is to be calculated. This extensive hydrodynamic database contains all the relevant hydrodynamic properties of the vessel for a range of drafts, speeds, headings and frequencies. The database contains:




A definition of the geometry (3D) Radiation pressure distributions for the six modes of motion Diffraction pressure distributions for all wave headings.

A hydrodynamic database can be calculated in 2d or 3d:

The 2d hydrodynamic database can be calculated using Octopus Office. Use is made of the 2d strip theory. The strip theory solves the three-dimensional problem of the hydro mechanical and exciting wave forces and moments on the ship by integrating the two-dimensional potential solutions over the ship's length. Interactions between the cross sections are ignored for the zero-speed case. So, each cross section of the ship is considered to be part of an infinitely long cylinder.The strip theory is a slender body theory, so one should expect less accurate predictions for ships with low length to breadth ratios. However, experiments showed that the strip theory appears to be remarkably effective for predicting the motions of ships with length to breadth ratios down to about 3.0, or even sometimes lower.

The 3d hydrodynamic database can be calculated using any 3rd-party 3D radiation/diffraction program. This is not a part of Octopus Office. Amarcon is able to deliver a 3d CHDB for ships and offshore structures.

See Also:

Create CHDB Add CHDB View CHDB

3.4.1. Create CHDB (Compiled Hydrodynamic Database)

A 2D- CHDB file can be created within Octopus Office.To create a 2D- CHDB, an Hull and Grid file should be available. The hull file can be created with the 2D Hull Modeller.The grid file can be created with the 3D Hull Modeller.The 2D-CHDB file can be created with 2D CHDB Creator.

The 3D hydrodynamic database can be calculated using any 3rd-party 3D radiation/diffraction program. This is not a part of Octopus Office. Amarcon is able to deliver a 3d CHDB for ships and offshore structures

See Also:

Create 2D CHDB 2D Hull Modeller 3D Hull Modeller Add CHDB




3.4.2. Add CHDB (Compiled Hydrodynamic Database).

To add a chdb right click at the top of the project tree.The following window appears:

'Name': type the name which will appear in the project tree.

After clicking OK select the required CHDB file in the following window by clicking the Browse button:

See Also:

Create CHDB View CHDB




3.4.3. View CHDB (Compiled Hydrodynamic Database).

Once the CHDB is added, the properties of the vessel are shown in different tabs. Be careful when selecting another CHDB file, the calculations which are located below in the tree (left pane) have to be calculated again!

General properties like drafts, speeds, directions and frequencies for which the CHDB is valid are shown in the tab 'General'Trans X, Trans Y and Trans Z specifies the position which is the reference point for wave forces calculation. Phase of a wave is the phase with respect to this point.

Tab Geometry Tab Wave Forces Tab Added Mass & Damping Tab Motion Equation Coefficients

See Also:

Add CHDB




Geometry.The properties of the geometry are shown.

The properties of the geometry can be viewed for the different drafts by clicking in the cell displaying the draft. A list is shown with the different drafts in the file from where a selection can be made.

See Also:

View CHDB




Wave Forces.The Response Amplitude Operator (RAO) of the wave loads is shown in a colormap.

By left click and drag in the color map the heading for the diagrams at the right can be changed. Right click in the color map or diagrams gives the following options:

Copy to Clipboard (puts figure in clipboard) Show Cursor Full Screen Settings (change z-axis scale)

By clicking button the numerical values are displayed in a table. Right click in the table copies the

numerical values to the clipboard. Clicking button displays the diagrams again.

See Also:

View CHDB




Added Mass & Damping.The frequency dependent added mass and damping coefficients are shown.

Left click in the diagram shows the numerical value of the cursor position.Right click in the diagram gives the following options:

Copy to Clipboard (puts figure in clipboard) Show Cursor Full Screen Settings (change axis scale)



See Also:

View CHDB




Motion Equation Coefficients.The frequency dependent added mass and damping coefficients are shown.

- Right click in the table copies the numerical values to the clipboard.

See Also:

View CHDB

3.5. Introduction Working with RAO's

This chapter explains how to create the RAO's (Response Amplitude Operators)The RAO delivers the response motion per unit wave height.

To create a RAO, take the following steps:

Generate a mathematic model of the vessel, including anti roll tanks, bilge keels, methods for tuning roll motion.

Add a loading condition.

See Also:

RAO Responses Bilge Keel Roll Damping Anti Roll Tanks Stochastic Linearization Loading Condition Calculate RAO View RAO




3.5.1.Prepare RAO Calculation

Configure RAO

RAO Responses.Octopus Office can calculate so-called 'primary' or 'basic' responses, 'user-defined' responses, 'combined' responses and sectional loads.

- To create a RAO configuration: Right mouse click in the tree (left pane) at CHDB

- Type a name which is assigned to the RAO configuration

Basic responses are always required. The basic responses are motions of the motion reference point (surge, sway, heave, roll, pitch, yaw)

Sectional Loads are the forces and moments acting on a point in a sectional plane of the hull. Relative motions are the relative motions at different positions of the vessel. The vertical position

of these points is in the waterline. User defined responses are absolute motions, velocities and accelerations in user-defined points

on the ship. User-defined responses are derived from the primary motion responses by taking single and double time-derivates.

Combined responses are responses which are a linear combination of 'basic' and/or 'user-defined' responses. Using this feature you can define any kind of response, which can be expressed as a linear combination of other responses. Please note that all the phase information is maintained.




- Enter the required motion reference point for which the RAO's are calculated in the fields 'Motion Reference Point'. Coordinates are defined with respect to (APP,CL,BL).

- Configuration of the sectional loads is done by clicking button Sectional Loads. The following dialog appears:

Sectional loads can be calculated in the X-plane, Y-plane and Z-plane. The first coordinate defines the plane, the second and third coordinate specifies a point on the selected plane.

- Configuration of the relative motions is done by clicking button Add Relative Motion. The following dialog appears:

'Name' : Type the name for this response 'Acting point' : Definition of the x,y,z-coordinates of the

point of interest.

- Configuration of the user-defined responses is done by clicking button Add User Response. The following dialog appears:

'Name' : Type the name for this response 'Type' : The type of response to be analyzed (motion,

velocity or acceleration, with or without contribution of gravity acceleration)

'Mode' : The direction of the response (longitudinal, transverse or vertical)

'Acting point' : Definition of the x,y,z-coordinates of the point of interest.

- Configuration of the combined responses is done by clicking button Add Combined Response.

The simplest application of this feature is a combined response with only one scaled response component. This way you can define responses in any unit. For example: a conversion from [deg] to [rad]




is made by scaling the roll motion with a factor pi/180, = 0.01745 (see dialog below).

See Also:

Definition Coordinate System Introduction RAO Bilge Keel Roll Damping Anti Roll Tanks Stochastic Linearization

Bilge Keel.Add a bilge keel:

Enter the distance from APP to aft end of bilge keel and enter the distance from APP to fore end of bilge keel.

Enter the bilge keel height in [m]. (Height is the distance from tip of bilge keel perpendicular to the hull.)

Check the positions of the bilge keel as displayed in the hull view.

Move a bilge keel:

Modify the distances in the edit boxes.

Hold the CTRL-key and the SHIFT-key and press the left mouse button on the bilge keel aft end or fore end and then move the mouse while holding these three buttons pressed, to the new location.

- Select the "Use defaults" button to use the default settingsBe aware, the bilge keel only is taken in account when the Roll Damping method 'Ikeda' is selected (and within the Ikeda method the 'bilge keel roll damping coefficient (B44k)' is selected). See also Roll Damping. Tuning by means of changing height bilge keel.It may be difficult to achieve the required degree of correlation between measured and calculated roll motion, or the related transverse accelerations. If model tests or full scale results are available, a further tuning of roll motion or transverse acceleration can be applied.

This tuning can be done by modification of the viscous damping contribution. Tuning can be done of roll angles or transverse accelerations.

A practical way to increase the viscous damping is to increase the height of the bilge keel. This has an immediate effect on the magnitude of the total roll damping in a given sea state. The physical explanation for increasing the bilge keel height to a much larger artificial bilge keel is to account for effects which have




not been modeled in a common seakeeping model. By varying the bilge keel height roll motion or transverse accelerations can be tuned. Of course this procedure can only be applied if reference material in the form of measurements is available.

See Also:

Introduction RAO RAO Responses Roll Damping Anti Roll Tanks Stochastic Linearization

Roll Damping.The following roll damping methods are available:

No viscous roll damping Frequency-dependent potential

damping, viscous damping calculated at natural frequency

Ikeda method

Frequency-dependent potential damping

The non-dimensional total roll damping coefficients 1

and 2 at forward ship speed V have been determined at the natural frequency 0: = 1 + 2a by model tests.

The non-linear part of this damping, 2a, is assumed to be proportional to the frequency of oscillation.

So, at each frequency of encounter, e, the total roll damping coefficient is defined by:




The non-dimensional non-linear total roll-damping coefficient , found from free rolling tests, as given in figure-d, is expressed by:

In which a is the roll amplitude in radians, e is the frequency of oscillation (encounter frequency) and 0

is the natural roll frequency in radians per second.

The coefficients 1 and 2 will provide an equivalent total coefficient . From this coefficient

and the calculated potential damping coefficient , an equivalent additional roll damping

coefficient can be found:

The non-dimensional total roll damping coefficients 1 and 2 at forward ship speed V have been determined at the natural frequency 0: = 1 + 2a by model tests. The non-linear part of this damping, 2a, is assumed to be proportional to the frequency of oscillation. At the natural frequency, the additional damping coefficient, N44a(0,a), will be determined and the non-linear part will be added for the other frequencies of oscillation. So, at each frequency of encounter, e, the roll damping coefficients are defined by:




Ikeda method

The additional roll damping coefficient, N44a(we,fa)Ikeda, is estimated by the empirical method of Ikeda and the potential damping, N44p(we), will be added:

This method can not be used for unusual ship forms, for very full ship forms and for ships with a large breadth to draught ratio. Even a few cross-sections with a large breadth to draught ratio can result in an extremely large eddy-making component of the roll damping. So, always judge the components of this damping. See Octopus Seaway Theory at www.amarcon.com/support/documentation for more information.

The 'correction on the potential damping coefficient due to forward speed (B44s)' component should only be selected when a 2D CHDB is used. When a 3D CHDB is used, this component is already included in the CHDB.

See Also:

Introduction RAO RAO Responses Bilge Keel Anti Roll Tanks Stochastic Linearization Introduction CHDB




Anti Roll Tanks.Configuration Anti Roll Tanks:

'Name': name of the anti roll tank 'Position Aft': Position of the anti roll tank with respect to aft perpendicular 'Height Bottom': Position of the bottom of anti roll tank with respect to keel 'Length': Length of the anti roll tank in m 'Width': Width of the anti roll tank in m, usually almost equal to the beam of the vessel 'Fluid Level': Level in m of the still water level of the anti roll tank 'Density': Density of the fluid in the anti roll tank

The anti roll tanks also influence the mass. So in the loading condition should the mass and the free surface moment of the anti roll tanks be added.

For the mathematical implementation of anti roll tanks see Octopus Seaway Theory at www.amarcon.com/support/documentation for more information.

See Also:

Introduction RAO RAO Responses Bilge Keel Roll Damping Stochastic Linearization

Loading Condition Stochastic Linearization.




- Define the different sea states for which the linearization should be done. The spectrum used is a Jonswap spectrum. Remember, Jonswap with gamma = 1 is equal to the Pierson Moscowitz spectrum.

Since the viscous roll damping coefficient itself is a function of the roll amplitude and frequency, it results in a roll transfer function which is nonlinear in the wave height. This implies that the linearized roll transfer function varies per sea state.To account for the nonlinear viscous damping behavior, the sea state dependent roll RAO's are solved in an iterative manner by applying the principle of stochastic linearization, as shown below. The viscous damping is estimated using a start-value for the roll motion. The result is a roll RAO. This RAO is used to calculate the roll angle in a particular sea state. If the roll angle is equal to the assumed roll, convergence has been achieved. Else a new roll damping is computed using a larger or smaller roll angle, the roll RAO is re-calculated and a new roll response in the particular sea state is calculated. This loop is repeated until convergence has been obtained.

See Also:

Introduction RAO RAO Responses Bilge Keel Roll Damping Anti Roll Tanks

Define Loading Condition

Loading Condition.To add a loading condition:

Right click at 'Loading Conditions' in the tree at CHDB. Since a loading condition is vessel specific, the loading conditions are located under a chdb

Type the name of the loading condition.

Select tab 'Mass Details' Right click at 'All Mass Items' to

add a mass group Select the created mass group

by left click Add a mass by clicking one of the buttons:

o Add GMPo Add 1Do Add 2Do Add 3D




Or right click on 'All Mass Items' or mass group to Import Mass Groups from other Loading Condition files.

Select tab 'Summary' Press button Calculate to calculate the mass distribution

The result after pressing Calculate is presented in a numerical and graphical way, see the picture below:

Add GMP

Fill in the required numbers for draft, KG or GM.When the box is closed by clicking OK the corresponding mass distribution is calculated.




Add 1D

Fill in the required mass items. Positions have to be entered in the coordinated system with 0 point at (APP,CL,BL)

Add 2D Fill in the required mass items. Positions have to be entered in the coordinated system with 0 point at (APP,CL,BL)

Add 3D Fill in the required mass items. Positions have to be entered in the coordinated system with 0 point at (APP,CL,BL)




Import Mass Groups

Click Browse to select a loading condition file.Check the required mass groups and click OK.

See Also:

Definition Coordinate System Introduction RAO

Import Loading ConditionTo import a loading condition:

Right click at 'Loading Conditions' in the tree at CHDB. Since a loading condition is vessel specific, the loading conditions are located under a chdb.

Choose Import from the menu. Type the name of the loading

condition. Browse to a 3rd party loading

condition file. Select the type of decoder. Click OK

See Also:

Introduction RAO

Define External Condition

External Condition. To add an external condition:

Right click at 'Loading Conditions' in the tree at CHDB. Since a loading condition is vessel specific, the loading conditions are located under a chdb.

Type the name of the external condition.

Right click at 'All External Conditions' to add a external condition




External Conditions:External condition can be defined in one mass matrix(6x6) and matrixes(6x6) for added mass, damping and restoring coefficients. Added mass, damping and restoring coefficients matrixes can be defined for each combination of speed and encounter frequency. If an external condition is not defined relative to the coordinated system with 0 point at (APP,CL,BL) than is not necessary to recalculate all matrixes. The translation to (APP,CL,BL) can be given at the Definition of the coordinate system.

To define matrixes for combinations of speed and encounter frequency define speeds and encounter frequencies first by clicking the Define... button. Note that the check Independent from speed and frequency must be unchecked.




Linear Springs:A spring condition can be defined as one restoring matrix.

The linear spring coefficients in the three directions in a certain point (xp, py, pz) are defined by (Cpx, Cpy, Cpz). The units of these coefficients are kN/m. This results in the following restoring matrix:

� Surge

� Sway




� Heave

� Roll

� Pitch

� Yaw

See Also:

Definition Coordinate System Introduction RAO




External Condition File Description

EXTCON - External condition

NFIELD No. of data fields in this record (incl. this field)ICON Internal condition reference no.ICONTY Condition typeNLABEL Label lengthLABEL Condition label (character string with length=NLABEL)REFX X acting point APPREFY Y acting point CLREFZ Z acting point BLNUMSPD No. of speedsISPDTY Speed unitNUMRAD No. of encounter frequenciesIRADTY Frequency unitRepeat for I=1,NUMSPD SPEED SpeedNext IRepeat for I=1,NUMRAD RAD FrequencyNext I

Comment:ICONTY Condition type

0 other1 spring

ISPDTY Speed unit1 m/s2 kn

IRADTY Frequency unit1 s2 1/s3 rad/s

EXTMAT - External 6 - 6 matrix

NFIELD No. of data fields in this record (incl. this field)ICON Internal condition reference no.IMATRIX Internal matrix reference no.ISPD Speed indexIRAD Frequency indexIMATTY Matrix typeIGLOBAL Dependency typeRepeat for I=1,6 Repeat for J=1,6 MAT(I,J) Hydrodynamic matrix Next I




Next J

Comment:IMATTY Matrix type

11 Mass matrix12 Added mass matrix21 Damping matrix31 Restoring matrix

IGLOBAL Dependency type0 speed and frequency dependent1 speed and frequency independent

3.5.2. Calculate / View RAO

Calculate RAO

After the RAO configuration is prepared, by defining bilge keel, anti roll tanks and so on, do the following steps to create a RAO calculation:

. Right mouse click in the tree (left pane) at RAO Config: Type a name which is

assigned to the calculation

Select the loading condition for which the RAO should be calculated, browse to the loading condition by clicking button Browse:

Optionally select a external condition for which the RAO should be calculated, browse to the external condition by clicking button Browse:

Fill in the motion reference point (in the example: the center of gravity for the given Loading Condition).

Click button Calculateand the RAO is calculated.




See Also:

Introduction RAO View RAO

View Rao.The properties which are valid for the RAO are visible in tab 'General':

Motion reference point Selected Responses Speed & Heading Wave frequencies Sea States

The calculated RAO is presented in a graphical way, select tab "RAO's", the following window appears:




By left click and drag in the color map the heading for the diagrams at the right can be changed.Right click in the color map or diagrams gives the following options:




See Also:

Introduction RAO Calculate RAO

3.5.3. Export to Seaway results.

OCTOPUS Office is able to make an export to Seaway output. To export a RAO:

- Right mouse click in the tree (left pane) at RAO

- Select the required load case and the sea state (used for stochastic linearization).- Browse for an export file and click 'Convert'.

The results are stored in a readable text file.




3.6. Statistics

3.6.1. Configure Statistics Responses.

Before statistical calculations can be done, assign the responses and reference period.

Right mouse click in the tree (left pane) at RAO:

Type a name which is assigned to the statistical calculation

Define the reference period in the field 'Reference Period' Define the number of directions at one side. Select the responses for which the statistics should be calculated, by selecting the response and

clicking button Use the Up and Down buttons to order the responses.

Once the configuration of the statistics is ready, the following statistical calculations can be performed:

Sea State Statistics W3C Wave Database Statistics Wave Scatter Diagram Statistics




See Also:

Sea State Statistics Wave Scatter Diagram Statistics W3C Wave Database Statistics Definition Statistical Operators

3.6.2. Sea States

Calculate Sea State StatisticsTo create sea state statistics:

Right mouse click in the tree (left pane) at Statistics Configuration:

Type a name which is assigned to the sea state statistics calculation, after doing this the following window appears:




Select the sea states for which the statistics should be calculated, browse to the environment file by clicking button Browse:

Click button Calculate and the statistics is calculated.

In tab 'Spectral Moments' the spectral moments of the different sea states, speeds and headings are visible.The results are visible in a graphical way, see: tabs Statistics and Envelope Sea States

See Also:

Configure Statistics Responses Sea States Definition Statistical Operators

Short Term Sea State StatisticsShort term statistics can be shown for different responses, sea states and operator. Level is used as a maximum value for the diagram. By default level has the value of criterion as configured in Statistics Configuration. To view the envelope of all responses check All, all responses that have a level value will contribute to the envelope.

By left click and drag in the colormap the heading and speed for the diagrams at the right can be




changed.

Right click in the color map or diagrams gives the following options:


By clicking button the numerical values are displayed in a table. - Right click in the table copies the


By clicking button a polar plot is shown:

Different operators are available:

Most Probable Maximum P Outcrossing N Outcrossing Significant (Single) Significant (Double)




Rayleigh

See Also:

Create Sea State Statistics Configure Statistics Responses Create Sea States Definition Statistical Operators

Envelopes sea state statistics.Envelopes can be shown for different responses and operator.The tab Sea States gives the envelope for all sea states where the values are calculated for the selected speeds and headings, the tab Speed gives the envelope for all speeds and sea states using the selected headings and the tab Headings gives the envelope for all headings and sea states for all selected speeds.

Right click in the diagrams gives the following options:

Copy to Clipboard (puts figure in clipboard)




Show Cursor Full Screen Settings (change axis scale)

In the fields 'Select Speeds' and 'Select Headings' a particular speed or heading is shown in the envelope. For instance, when directionality and heading control is possible, a range of headings can be excluded. This is only the case for self-propelled vessels with redundant propulsion systems.

See Also:

Create Sea State Statistics Configure Statistics Responses Create Sea States Definition Heading Definition Statistical Operators

3.6.3. Scatter Diagrams

Wave Scatter Diagram Statistics.To create wave scatter diagram statistics:


Type a name which is assigned to the scatter diagram statistics calculation, after doing this the following window appears:




Select the scatter diagram for which the statistics should be calculated, browse to the environment file by clicking button Browse:

Click button Calculate and the statistics is calculated.

The results are visible in a graphical way, see: tabs Short Term and Long Term

See Also:

Configure Statistics Responses Wave Scatter Diagram Definition Statistical Operators

Short Term Wave Scatter Diagram StatisticsShort term statistics can be shown for different responses, sea states and operator. Level is used as a maximum value for the diagram. By default level has the value of criterion as configured in Statistics Configuration. To view the envelope of all responses check All at the left of the response combo box, all responses that have a level value will contribute to the envelope. To view the envelope for all speeds check All at the left of the speed combo box and to view the envelope for all headings check All at the left of the heading combo box. Any combination of envelope is possible.




The right column gives the workability per sea height. The combined probability of all the sea states, where the response values do not exceeds the given level, results in the workability. In the above example the workability for seas up to 8 meters is 86%.

Right click in the color map or diagrams gives the following options:

Copy to Clipboard (puts numerical values in clipboard)


Most Probable Maximum P Outcrossing N Outcrossing Significant (Single) Significant (Double) Rayleigh

Double click in the scatter diagram displays a polar plot for the given sea state.

See Also:

Create Wave Scatter Diagram Statistics Configure Statistics Responses Wave Scatter Diagram Definition Statistical Operators




Long Term Wave Scatter Diagram Statistics

Right click in the diagram gives the following options:


Different return periods are defined. It's possible to define a user defined return period, by entering a number. Enter the number in Years.

By clicking button Config the following dialog appears:

It is possible to assign a probability for each heading. For instance, when directionality and heading control is possible, a range of headings can be weighted less. This is only the case for self-propelled vessels with redundant propulsion systems.

See Also:

Create Wave Scatter Diagram Statistics Configure Statistics Responses Wave Scatter Diagram Definition Statistical Operators




3.6.4. W3C Wave Database

Statistical W3C AnalysisMore elaborate analyses can be carried out when time series of waves are available. Using spectral data instead of derived wave parameters such as significant wave height, mean direction or zero-upcrossing period, ensures more accurate results, especially in multi-directional seas. Moreover, persistency effects are automatically included.

In Octopus Office, voyage simulations can be carried out by using the Argoss w3c-database. This historical world-wide wave database is the product of satellite observations and a 3rd generation wave model. It covers a period of 15 years with a time resolution of 3 hours. The wave condition at a particular date, time and location is described by a distribution of the energy, the direction and the directionality, as a function of the frequency. The position list of the voyage is used as input for voyage simulations. These simulations are carried out for different dates and time of departure, and repeated until convergence is obtained after 'N' simulations. The design values can be derived by defining a required success rate after simulating N voyages.

The W3C database is not part of Octopus Office 6, but is sold separately.

To create W3C statistics:


Type a name which is assigned to the W3C statistics calculation, after doing this the following window appears:




Configure the analysis by clicking button Configure, after doing this the following window appears:

Select the path where the Argoss Database is located by clicking button Browse.

Select the voyage by clicking button Browse.

Select the interval of the start date of the voyages by entering numbers in the fields 'Start Every'.

Select the number of starts by entering a number in the fields 'No. of Starts'. The start dates for each start will be incremented with the interval as specified.

Select the time between the waypoints by entering a number in the field 'Time between waypoints [h]'. The minimum value is 3 hours, since the resolution

of the wave data in the Argoss database is 3 hours. Select years for which the voyage should be calculated. The total number of starts for which

statistics is calculated is in this case : 1 x 13 = 13 starts. Close the dialog by clicking button OK. Click button Calculate and the statistics is calculated.

The results are visible in a numerical and graphical way, see tabs: General, Sea Condition, Short Termand Long Term

See Also:

Configure Statistics Responses Voyages




General W3C Statistics

The level (single amplitude), probability, return period and mean Tz is shown for every response. The results are visible in a numerical and graphical way, see tabs: Sea Condition, Short Term and Long Term

See Also:

Statistical W3C Analysis Configure Statistics Responses Voyages

Sea condition W3C statistics




For each simulated voyage the sea condition during time is shown.- Select a voyage in the field 'Voyage'. Voyages are ordered with respect to start date.- Select a response in the field 'Response'.





The results are visible in a numerical and graphical way, see tabs: General, Short Term and Long TermSee Also:

Statistical W3C Analysis Configure Statistics Responses Voyages Definition Statistical Operators

Short term W3C statistics.

For each simulated voyage the short term statistics during time is shown.- Select a voyage in the field 'Voyage'. Voyages are ordered with respect to start date.- Select a response in the field 'Response'.





Most Probable Maximum P Outcrossing N Outcrossing Significant (Single) Significant (Double) Rayleigh





The results are visible in a numerical and graphical way, see tabs: General, Sea Condition and Long Term

See Also:

Statistical W3C Analysis Configure Statistics Responses Voyages Definition Statistical Operators

Long term W3C statistics






Different return periods are defined. It's possible to define a user defined return period, by entering a number. Enter the number in Years.

The results are visible in a numerical and graphical way, see tabs: General, Sea Condition, Short Term

See Also:

Statistical W3C Analysis Configure Statistics Responses Voyages

4. QUICK GUIDEIntroduction to the Quick GuideThe Quick Guide describes the steps needed to get started with Octopus Office.

To get a real quick start an example project is included in Octopus Office. Click File, Open... and select the 'Example Project' and browse through the project.

See Introduction Octopus Office for an introduction regarding the basic idea of Octopus Office.

The user InterfaceWhen the tree-items in the left pane are Right Clicked on, the different options, available to that specific section, are displayed.To save any settings or results, use the "save" option from the file menu, or close the dialog and confirm the changes.The active dialog is marked in bold in the tree in the left pane.Tree-items can be marked in red. The reason is, that settings on a higher level on the branch have been changed. The changes are not automatically updated in the lower levels. The items, marked in red, have to be recalculated or updated manually, to display the correct results, according to the changed settings. After recalculation or updating the red marked items, Save the settings to unmark the items. See also Using the Workspace in the User Guide

Create a new project

To get a quick start, an example of a project which uses the Container_Ship_014 has been included in Octopus Office. To create this project by yourself, take the following steps:

Start OCTOPUS Office Create a new project

To create a new project, click File, New...

See also Create New Project in the User Guide




Create Compiled HDB (Hydrodynamic DataBase) To create a CHDB an Hull and Grid file should be available.These files can be viewed or created with 2D Hull Modeller and 3D Hull Modeller.

o Click Tools, 2D Hull Modeller..., File, Open to view the Container_Ship_014 hull file. When necessary, edit the hull.

Close the 2D Hull Modeller.

o Click Tools, 3D Hull Modeller... to create the Container_Ship_014.glv file, which is needed to create a 2D CHDB.




o Open the hull file, click File, Open and select the Container_Ship_014.hul file. o Create a mesh, click Geometry,

Mesh. The following dialog appears:

'Draft Aft': Fill in draft Aft (15m)

'Draft fwd': Fill in draft Aft (15m)

Click button OK to create the mesh.

o Check if the (0,0,0) position is equal to (APP,CL,BL). If so, Save the mesh as a Container_Ship_014.glv file: Click File, Save as.. and save the glv file.

o Close the 3D Hull Modeller. o To create a 2D- CHDB, click

Tools, Create 2D CHDB...

o 'Hull file' specifies the location of the hull file. To select a location, click button Browse. The Hull Browser is opened. Select Container_Ship_014. Finally click button Open in the Hull Browser.

o 'Grid file' specifies the location of the grid (Container_Ship_014.glv) file. o 'Name' Type the name of the vessel and eventually a description. o 'CHDB file' type the name and the location of the CHDB file which will be created after

clicking button Create.




See also 2D Hull Modeller in the User GuideSee also 3D Hull Modeller in the User GuideSee also Create 2D CHDB in the User GuideSee also View CHDB in the User Guide

Add Compiled HDB

- At the top of the project tree, "Right click" the newly created project name and select "Add Compiled HDB" - Enter a name and select "OK" - At "Select CHDB file" , use the "Browse" button to locate to the CHDB file. - By selecting the various tabs at the top of this screen, different types of information stored in the CHDB, can be displayed.

See also View CHDB in the User Guide

Define Environment

Expand the "Common" item from the tree to define Sea States, Wave Scatter Diagrams and Voyages.

o Sea State Section Right Click "Sea States" and select "Create Sea States" Enter a name and select OK Generate the sea states by entering numbers manually, or generate a range of sea states by clicking the "Define Sea States" button.




A sea state consists out of 1 or 2 wave systems, where the second wave system is defined with an angle with respect to the first wave system. Typical use of 2 wave systems is when a combination of sea and swell should by applied.Sea States created or added in this section are used as Environment file in the Statistics Configuration.See also Sea States in the User Guide

o Voyages Section Right click "Voyages" and select "Create Voyage" Enter a name and select OK. A voyage is created by clicking on a specific location while holding the <ctrl> key pressed. Once a waypoint is generated its position can be changed by changing the values in the fields 'Latitude' and 'Longitude' manually. Assign a specific port to a waypoint by clicking button Port List.




From the file menu, select "save" or close the Voyage Section dialog. The created voyage file can now be used in the Wave Scatter Statistics or in the W3C statistics. See also Voyages in the User Guide

o Wave Scatter SectionRight click "Wave Scatter Diagram" and select the "Create Wave scatter Diagram" option. Enter a name and select OK.At the bottom of this screen, change the settings which define the spectra, when necessary.




Click the "Scatter DB" button. At the bottom, select the applicable map and Scatter Database. Select the applicable area in the map, keep the <ctrl> pressed to select multiple areas.A voyage can also be imported. See the "Voyages" section on how to create a voyage.

When a voyage is selected, the weights for the different areas are created automatically.




When necessary, these weights can be adjusted. See also Wave Scatter Diagram in the User Guide

Loading ConditionIn the left pane, right click Loading Condition. See Loading Condition how to create a loading condition.

See also Loading Condition in the User Guide

Configure RAO calculation

First, a RAO configuration has to be created. In the left pane, right click the chdb in the tree and select the Create RAO Configuration option. Enter a name and select OK.

Edit the different settings like bilge keel, anti roll tanks for the RAO calculation, when necessary. Also define the motion reference point.See also RAO Responses in the User Guide




Calculate RAOIn the tree in the left pane, right click the RAO Config and select the Create RAO Calculation option. Enter a name, and select OK. Browse to a Loading Condition and select "Calculate".

After finishing the calculations, the tabs display information stored in the RAO.See also Calculate RAO or View RAO in the User Guide

Create a Statistics ConfigurationRight click on the RAO in the tree to create a Statistics Configuration.

Select the required responses. Use the left and right arrows to remove and add responses from




the selection list. (User defined responses or combined responses can be created or edited at the Create RAO Configuration section). Click the "Update All Responses" button if User defined or combined responses are not displayed in the "All Responses" list. See also Config Statistics Responses in the User Guide

StatisticsRight click the Statistics Configuration to create Scatter Calculations, Sea States calculation or W3C calculations.

o Sea State Calculation:

Right Click the "statistics config" in the left pane and select Create Sea State Calculation. Enter a name and select OK. Browse to a Wave Sea State file. (See the Sea State Section on how to create or add a Sea State file). Select "calculate" to display the results. The calculation can take several seconds.See also Sea State Statistics in the User Guide

o Scatter Calculation:

Right Click the "statistics config" in the left pane and select Create Scatter Calculation. Enter a name and select OK. Browse to a Wave scatter diagram file. (See the Wave Scatter Section on how to create or add a Wave scatter diagram file). Select "calculate" to display the results. The calculation can take several seconds.See also Wave Scatter Diagram Statistics in the User Guide

o W3C Calculation:

The W3C calculation requires the Argoss W3C database. This database is not part of Octopus Office 6, but is sold separately.Right Click the "statistics config" in the left pane and select Create W3C Calculation. Enter a name and select OK. Select "Config…" and browse to the Argoss database and Voyage/Route file (See Voyage Section on how to create or add a Voyage/Route file).Change the other settings for the voyage analysis and select OK. Select "Calculate" to start the calculation. Depending on the settings, the calculation can take several hours.

See also Statistical W3C Wave Analysis in the User Guide




5. FREQUENTLY ASKED QUESTIONSQ: When I try to open Octopus Office I get the message: CM-Stick Entry not found, Error.A: This happens if the license key isn’t found. Make sure you have plugged in the license key, or make sure the license key is available by the network. Q: Octopus Office doesn't see the license stick, however it is plugged into the computer.A: Make sure the following applications have access to the internet, make sure they are excluded in the firewall settings:

CodeMeter Runtime Server CodeMeter Control Center AMARCON OCTOPUS Office

Q: In the motion RAO, I get very high responses (peaks) for Surge, Sway, and Yaw motions at high speeds.A: The reason for this is the singularity which occurs because the encounter frequency approaches zero. Q: My heave motion is extremely high, while roll and pitch seem reasonable. What’s going on?A: Maybe you have forgotten to specify your motion reference point in RAO Responses. Default, the motion reference point is equal to (0,0,0), which means (aft, centerline, baseline), see also Definition Coordinate System.

User Manual OCTOPUS-OFFICE SHIP MOTION ANALYSIS SOFTWARE

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