DTO VH presentation - · PDF fileHolds or Complete Ship Model) by finite element calculation...

© - Copyright Bureau Veritas

VeriSTAR Hull O. Degrand

Manager of 3D Modeling section VeriSTAR Hull Project Leader

[email protected]

Tel: +33(0)1 55 24 74 54

Development Department June 2016

mailto:[email protected]


Overview Last achievements

Action plan


Overview

4

VeriSTAR Hull © - Copyright Bureau Veritas

►Rule tool to perform strength assessment of three dimensional models (3 Holds or Complete Ship Model) by finite element calculation method.

►Available with the latest edition of rules:

BV Rules for Offshore Units (FPSO, FNLG, Drilling Ships),

BV Rules for Steel Ships (Container ships, LNG, LPG),

CSR Bulk Carrier,

CSR Double Hull Oil Tankers,

CSR-H.

Scope

5


► 3 types of analysis can be performed :

Global strength analysis:

Local fine mesh analysis:

Fatigue analysis:

Scope

6


Tools

► Based on the efficient modeling tool FEMAP and open to various F.E. and solvers : NX Nastran and MSC Nastran.

►All packaged in a single program.

►VH benefits of all FEMAP capacity for :

Geometry modeling and import / export from various CAD format.

Import / export from other software such as Patran, Ideas ….

Import / export solver files from NX Nastran and MSC Nastran.

7


► The Finite Element Pre & Post Processor FEMAP is fully integrated into VeriSTAR Hull :

Tools

All packaged

into a

single program

8


VeriSTAR Hull Modeling

►Specific tools to help the user during the model generation and to reduce the time of pre-processing:

►Check tool: mesh quality check to get more reliable results with the finite element analysis:

9


►BV View: very useful tool to manage the view of the model

►Automatic tool to fill in the panels


10



►Compartment definition with friendly tools:

11


VeriSTAR Hull Modeling ► Automatic detection of the buckling panels from the topology and the

element’s connectivity:

12


VeriSTAR Hull Analysis ► Including a lot of powerful automatic processes for :

Corrosion deduction:

Application of the boundary conditions:

13


VeriSTAR Hull Analysis ► Including a lot of powerful automatic processes for :

Loads:

Balancing:

14


VeriSTAR Hull Post-processing

► Yielding and buckling ratio check and envelope for all loading conditions.

► Efficient tool to identify the critical locations and the loading condition associated.

15


► Post-processing tool to facilitate the buckling analysis and to identify the buckling failure mode.


16


• Integrated tool to manage fatigue details and compute lifetime :


17


VeriSTAR Hull Sub-modeling

Reduce the time of the solver and the size of the database.

In the early stage, different designs-solutions can be analysed very quickly for:

Local Fine Mesh Structural Strength Analysis,

Fatigue Analysis.

Full integration of the sub modeling process in VeriSTAR Hull from automatic link generation:

18


Top Down Analysis

Automatic Identification of master-slave nodes:

Automatic generation of the corrosion addition, loads and the boundary conditions in

the local fine mesh from the global mesh results.

Full integration of the sub modeling process in VeriSTAR Hull from automatic link generation: Automatic Identification of parent elements:


Last achievements

20


Material / Property ►Added new material type:

Stainless

Aluminium

► Update of the corrosion process,

► Update of the post-processing process to apply specific criteria for aluminium.

►Property editor: to manage easily all the materials and properties through tables.

21


Buckling / User load set

► Update of the automatic buckling panel definition to compute buckling data for irregular and triangular plate panel based on the Common Structural Rules for Bulk carriers and Oil Tankers approach.

► User load set: new feature to input specific nodal forces and moments (e.g. to take into account the mooring loads).

22


Scantling evaluation / CSR-H

► Purpose: to estimate the required scantling for all elements (plates and stiffeners) which don’t follow the yielding and/or buckling requirements.

► Based on iterative calculations: • Plate: thickness increase (step = 0.5mm), • Stiffener: increase of all dimensions (step = 10%).

► Automatic updating the stress:

∆−=

τ

σ

σ

τ

σ

σ

y

x

y

x

tt1

'

'

'

23


Reporting ► Automatic report generation to save time during the post-

processing with:

Presentation of the FEM model and the assumptions used in the calculations,

Reporting of the loads with intermediate results (highest points, accelerations),

Results presentations (yielding, buckling and fatigue).

24


Rules

► Implementation of new BV Rules for container ship:

►Corrosion

►Loads

►Balancing process

►Yielding and buckling assessment

►Fatigue analysis

► Implementation of the service notation: Asphalt carrier with independent tank. Contact issue is introduced with GAP elements. Updating of the interface and the load calculation to manage the

independent tank specific load cases. Updating of the post-processing to perform the assessment of the

keys based on NR 622.


Action plan

26


Action Plan ► Automatic hotspot generation:

27


Action Plan ► New approach to take into account the non-linear behaviour of the independent tanks

based on surface to surface contact:

28


Action Plan

► Complete ship model analysis:

Improve the link between VeriSTAR Hull and the hydro-structure HOMER solution:

► Extreme loading cases for yielding and buckling checks:

► Generation of the input files (finite element model, compartment definition)

► Import pressure computed by HOMER

► Import Nastran results

► Spectral fatigue analysis:

► Generation of the input files (finite element models, compartment definition)

► Import and review of RAO computed by HOMER

► Damage computation (definition of input data, results display)

used for the post-processing

29


Action Plan ► Updating of VeriSTAR Hull to be compatible with the last version of FEMAP V 11.3.

DTO VH presentation - · PDF fileHolds or Complete Ship Model) by finite element calculation...

Documents

Transcript of DTO VH presentation - · PDF fileHolds or Complete Ship Model) by finite element calculation...