ELECTRIC BOAT

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• ELECTRIC BOAT
• CORPORATION
• RESPONSE TO THE PPE WG RFI
• DOCUMENT mfg/2000-03-03
• Presenter Tabitha M. Hitchcock
• Author Steve Gordon

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Preview

• CAD-CAE Integration overview
• Use Case for CAD-centric process
• Use Case for CAE-centric process
• CAD/CAE Integration and STEP

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A CAD-CAE INTEGRATION PLAN WITH ISO STEP STANDARDS
Current DBT Process GDM 6.5 Architecture
CDM
CATIA (V4)
CAD-Centric Process
?
PATRAN COMMANDS FEMAP Pro/Engineer HYPERMESH
I-DEAS
Future 21st Century DBT Process GDM 8.1
Architecture
CAE Tools
STEP Files (AP209, AP203)
?
?
FESOL VIBES ABAQUS LS-DYNA NASTRAN MechanicaSABER
USA
Teaming Collaborator Vendor/Supplier PDM-CAD
Systems
CAE-Centric Process
PDM System
CAD Tool(s)
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NEED BOTH CAD-CENTRIC AND CAE-CENTRIC PROCESSES

• Global vs. local analysis and requirements
• Shock and acoustic needs still generally drive
  global analysis
• Type (gender) and detail in solid CAD models is
  not appropriate for most of our analysis
  idealization
• Automated mesh generation is not the bottleneck
  appropriate geometry is!
• Need to focus more on electronic exchange
  technologies
• Propose Categories for CAD-CAE Integration
  across all current projects and activities

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APPROACHES AND CATEGORIES FOR CAD-CAE INTEGRATION
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USE CASE 1
Name Analysis Confirmation/Approval of
Design Concepts CAD Centric Process
(Category I and II) Actor Designers,
Analysts, Project Engineers
Purpose Extract or exchange CAD geometry to
facilitate engineering analysis in order to
evaluate, confirm, optimize or approve some
aspect of a design captured on an enterprise
Computer Aided Design system
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USE CASE 1 CONT.
Definition This use case addresses the
interaction between design and analysis
personnel and the electronic (or other)
exchange of design data, geometry, materials,
requirements and criteria among all parties.
It also applies in a CAD-centric process, where
the design is initially captured on the CAD
system and the iterative design process
requires periodic analyses and design changes
to modify the design.
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CAD-CENTRIC APPROACHES
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USE CASE 2
Name Analysis Development of Design
Concepts CAE-Centric Process (Category
III) Actors Engineers, Analysts,
Designers Purpose Develop mature and
optimized design concepts employing idealized
(FEA- specific) geometry first. Next, transfer
model to design (CAD) system for addition of
details and features for design disclosure,
drawing creation, etc.
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USE CASE 2 CONT.

• Definition Engineering analyses are performed
  to define a design concept using an
  idealized geometry, prior to the creation
  of an enterprise CAD product model (created
  by design personnel). This idealized
  simulation-specific geometry (analysis models)
  are used for concept studies and early design
  optimization. The model is then modified, by
  adding details and features, to create a CAD
  model to support drawings and
  manufacturing.

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A CAE-CENTRIC APPROACH
More mature or optimized concept prior to CAD
geometry capture designers add detail later for
drawing creation and manufacturing
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CREATING ENGINEERING ANALYSIS MODELS
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The ISO STEP 10303 Standards are not just about
data exchange! Todays enterprises need to
capture and integrate design, analysis, and
CM/PDM information.
AP209
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AVAILABLE CODES WITH STEP AP203 GEOMETRY EXCHANGE
CAPABILITY
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AVAILABLE CODES WITH STEP AP209 FEA MODEL
RESULTS EXCHANGE CAPABILITY
I-DEAS
?
CATIA
Considering Support
STEP File (AP209)
FEMAP
Development Initiated
FEA Geom.
Pro/Engineer
Version 8 (Beta) Version 9 (10/99)
FEA Only
Considering Support
PATRAN
COMMANDS
HYPERMESH
?
PDES, Inc. AP209 Pilot Project is approaching
these code vendors for AP209 support Dassault
Systemes (CATIA), PTC (Pro/E), SDRC (I-DEAS), ESP
(FEMAP)
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ENGINEERING ANALYSIS AP209 PILOT PARTICIPANTS
P
D
E
S
,

I
n
c
.

• End Users
• Boeing
• Lockheed-Martin
• Electric Boat
• Rolls-Royce
• BAe
• Northrop Grumman

• Vendors/Developers
• MSC
• Dassault
• PTC
• SDRC
• ESP (FEMAP)
• Support Organizations
• NIST
• Ford (ISAP)
• NASA

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A SHIPBUILDING BUSINESS CASE AP209 PILOT
SCENARIO OUTLINE Multi-Company Design-Analysis
Collaboration using FEA Models for Shock and
Acoustic Evaluations

• Need to create and utilize global (large-scale)
  combined FEA models of ships and major equipment
  for use with in-fluid transient shock analysis
  for design iteration studies and confirmation
  analysis
• Vendors/suppliers of major equipment produce
  both CAD product models and FEA models for
  incorporation in EBs ship analysis models
• Results from fluid-structure interaction shock
  analyses (base motions, accelerations) are passed
  back to the vendors for refinement of equipment
  designs
• Examples
• Northrop-Grumman Marine Systems and Electric
  Boat
• Knolls Atomic Power Lab (KAPL) and Electric Boat

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Northrop-Grumman Marine Systems
Major Equipment
Test Vehicle
Hull, Tanks
Decks, Girders
Electric Boat Corporation
Foundations
Shipbuilding Business Case Multi-Company
Collaboration FEA Models for Shock and Acoustic
Evaluations
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CAD-CAE COLLABORATION DATA EXCHANGE TODAY
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EXAMPLE OF SHIPBUILDING COLLABORATION DATA
EXCHANGE TODAY
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PROPOSED CAD-CAE COLLABORATION EXCHANGE
Geometry
Analysis
CAD Tools
CAE Tools
Company A
STEP File (AP209)
Customer
CAD Tools
CAE Tools
Company B
STEP AP209 Repository and CAD-CAE Archive!