Capability Description

8/3/2019 Capability Description

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www.maestromarine.com

Overview of the MAESTRO System

1 MAESTRO 2010


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www.maestromarine.comMAESTRO 20102

Historical Highlights

Early Stages of Development and Fielding

Professor Owen Hughes conceived and developed MAESTRO Wrote and published (Wylie/SNAME) textbook Ship Structural Design 1982 1983 Began moving MAESTRO into user community

Initial Cycle of Distribution, 1983 1989 Navies: United States, The Netherlands, The United Kingdom

Commercial design organizations

Middle Period of Distribution, 1990 - 1999 Navies total of 16 including Canada, Australia, Germany Ship Classification Societies American Bureau of Shipping, Lloyds Register,

Bureau Veritas, China Class, Croatian Register of Shipping Commercial User Base expanded to 40-50 companies

University Licenses 20+ universities worldwide

Recent Highlights, 2000 - 2010 Continued distribution throughout commercial industry Established links with Professor Jeom Paik and ALPS limit states analyses Expanded to handle larger models, faster, with improved solvers


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What is MAESTRO?

Beam Coarse Mesh Full-Ship Detail Full-Ship


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www.maestromarine.comMAESTRO Academic Conference 20104

Rationally-based Structural Design

design directly and entirely based on structural theory and computer-based methods of structural

analysis and optimization to achieve an optimum structure based on a designer-selected measure of

merit.

A true design process must be capable of accepting an objective, of actively moving towards it, and

of achieving it to the fullest extent possible.


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Main Capabilities

MAESTRO is a complete ship structural design system.

Global Design Analysis

Rapid Structural Modeling

Ship-based Loading

Finite Element Analysis

Structural Failure Evaluation Structural Scantling

Optimization

Hull Girder Ultimate Strength

Natural Frequency

Corrosion

Local Design Analysis

Integrated Coarse Mesh/Fine

mesh Analysis

3rd Party Import/Export

Automated Global BCs3rd Party Data Exchange

Hydrodynamic Load Interface

Import/Export Nastran Data

Geometry Import


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Structural Modeling

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Ship hull consists of a series of segments: cargo holds, compartments

FEMs are large and complex, and construction should be done in a carefully planned

levels and sequences

Modules are helpful as they are ideal high-level building blocks


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The MAESTRO Module

Modeling Components

Reference/Opposite Ends Section Spacing/Number

Endpoints

Frames, Girders, & Strakes

Stiffener Layout/Spacing



Ship Hull Girder Properties

Basic Ship Structural Properties

Hull girder properties, e.g.Inertias, Cross-sectional Area,Neutral Axis, Section Modulus,etc., can be recovered from themodel.

Longitudinal Effectiveness On/Off



Ship Based Loading

Lightship mass distribution

Structural weight Weight distribution

Hydrostatic Loads Still water

Waves

Tank Loads External bending moment and

shear force

Cargo Masses Forces

Moments Accelerations (6 d.o.f.)

Pressure Loads

Mass/Inertia Based Loads

Hydrodynamic Loads



Ship-based Loading



Finite Element Analysis

Obtain the stresses throughout the

model for all defined load cases.



Structural Failure Evaluation (Limit States)

Evaluation Types

MAESTRO

ALPS/ULSAP

ALPS/HULL

Evaluate the entire ship for all of thedifferent possible failure modes for

each load case.




Limit State Analysis The formulation of MAESTROs limit states is covered in Ship Structural Analysis and

Design and Ultimate Limit State Design of Steel-Plated Structures

These constitute the theoretical manual for MAESTROs limit state




Evaluation is automatic - all structural members areevaluated to the factors of safety chosen by the user

Different factors of safety can be specified for all

collapse limit states and for all serviceability limit

states, or specified on a limit state-by-limit state basis. In addition to the strakes, frames, and girders which

receive full evaluation... Additional panels, triangles, and additional beams receive limited evaluation

Struts and pillars are evaluated for Euler buckling

Evaluation Patches


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MAESTRO Adequacy Parameters ALPS/ULSAP Adequacy Parameters


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Automatic Evaluation Patch (Panel) Generation

A patch is a collection of elements with its boundary supported by

bulkheads or beams.


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Collects plate and beam elements

Automatic (or Manual) Evaluation Patch Generation

Represents the stiffened panels and correct panel parameters


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Hull Girder Ultimate Strength

ALPS/HULL, 2D (available now)

ALPS/HULL, 3D (near term implementation)


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Optimization

Uses sequential linear programing (SLIP2)

Optimization eliminates any structuralinadequacies

While achieving user-specified objectives

Least Weight

Least Cost

Weighted combination

Rationally-based Design Process(Optimization)

Iterates structure through design cycles torevise scantlings

Re-runs the finite element analysis

Re-evaluates the structural adequacy of eachmember for all failure modes and load cases

Process continues unit the structure hasconverged to an optimum design that has nostructural inadequacies

SLIP2 is able to solve problems involving

a large number of constraints of various

types and in which the objective may be

any user-specified non-linear function of

the design variables.

CostUnits

Cycles


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Rationally-based Structural Design

1CONSTRUCTION OF THEFINITE ELEMENT MODEL

FINITE ELEMENT ANALYSISCalculate Load Effect (Q)

LIMIT STATE ANALYSISCalculate Limit Values of

Load Effects (QL)

OPTIMIZATION OBJECTIVE

DESIGN EVALUATIONConstraints satisfied?Objectives achieved?

2

3

4

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SPECIFICATION OF LOADS,LOAD PARAMETERS,AND DESIGN WAVES

FORMULATE CONSTRAINTSg1 g2 g3 Q QL


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Fine Mesh Analysis

Fully integrated fine mesh modeling andanalysis capability. Ability to import

FEMAP/NASTRAN detailed models.


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Fine Mesh Analysis

MAESTRO Embedded Analysis

Integrated local models into the global modelthrough Rspline elements

Solve coarse mesh model and fine mesh models

MAESTRO Top-Down Analysis

Multiple models in a region

(1) solve coarse mesh model, (2) impose coarse

mesh model nodal displacements as boundary

conditions, (3) solve fine mesh models

3rd Party Top-Down Analysis

Export fine mesh models with boundary conditions


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Natural Frequency Analysis

Perform a natural frequency analysis

with or without added mass


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Corrosion

Corrosion is defined as an additive property to the original structure Associated via a Load Case

Net thickness is automatically used in FEA and Limit State Analysis


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3rd Party Data Exchange

Hydrodynamic Code Interface, such asPreCal, Wamit, VERES, Lamp, Mora, etc.


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3rd Party Data Exchange

Import/Export Nastran Data


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MAESTRO Benefits

Easy to create, modify, and maintain coarsemesh model

Ship based loading

Tanks

Hydrostatics

Hydrodynamic Interface

Structural Panel Evaluation Paradigm

Integrated & Switchable Structural Criteria

Coarse mesh / Fine mesh coexistence


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Contact US

DRS Defense Solutions, LLCAdvanced Marine Technology Center (AMTC)

Stevensville, MD 21666

Phone: 410-604-8006

Fax: 410-643-5370

Email: [email protected]

Web: www.maestromarine.com
mailto:[email protected]://www.maestromarine.com/http://www.maestromarine.com/mailto:[email protected]

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