CHIMAERA a Modeling and Simulation Framework Ulf Sellgren Department of Machine Design Royal Institu

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CHIMAERA- a Modeling and Simulation Framework
Ulf Sellgren Department of Machine
Design Royal Institute of Technology (KTH)
Stockholm, Sweden
Product Models 2000, November 2000, Linköping
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Mechanical design - an effort and an iterative
process
A microprocessor with 3 million parts
Designed and brought to full production by 300
people in 3 years A car with 10000 parts
Requires the effort from 750-1500 people over
about 4 years An airplane with 3 million parts
May require 5000 people over 5 years

Whitney, D.E., 1996, Why Mechanical Design
Cannot be like VLSI Design, Research in
Engineering Design, Vol. 8, pp. 125-128,
Springer-Verlag.
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Models with different structures
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Product model based simulation of modularized
products
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The framework - three layers and a methodology
Design framework - computing environments that
operate at a higher level than the operating
system and integrate the application tools used
by designers, analysts, and managers (Baldwin and
Chung, 1995). Purpose - to support human
cognitive activity (Alshawi et al., 2000)
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Physical layer - the AMOS II DBMS

From Orsborn (1996)
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The AMOS data model - basic constructs and
relations
From Orsborn (1996)
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The AMOS II class structure
AMOS II Beta Release 3, v1
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An AMOS II example
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Logical layer - the MOSAIC information model
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Model management concepts
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Interface - a relational object
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Tool layer
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A modeling methodology
Methodology - a collection of methods and
tools, the use of which is governed by a process
superimposed on the whole (Coleman et al., 1994)
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Decomposition and structuring - a solution to a
relational problem
Base module
Behavior module
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Interface - a relational object
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Tunnel drilling in hard rock
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Mobile rig with two booms - hierarchical model
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Mobile rig with two booms - topological view
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Some design questions to a behavior model
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Hole pattern and drilling plan
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Positioning
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Basic problem Move drill from initial
position to target position Behavior model
Boom module Environment model Interaction with
rig Method Quasi-static nonlinear simulation
(temperature loaded
actuators) Optimization
(Minimize position and direction errors)
(DVs - Uniform temperature for each
actuator) Analysis Get actuator length at
initial and target positions
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Concept generation
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Problem Create concept shape for the boom
mounting plate Behavior model Mounting plate
base module Environment model Interaction with
boom and with rig Method Topological
optimization - concept selection - shape
optimization Analysis Evaluation of topological
candidates
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Some simulation examples
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Component design within a systems context
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Model structure variants
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Model data management
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Conclusions

• Engineering design is a complex process
• Technical systems are complex
• Modularization is one approach to reduce
  complexity
• Submodels, mating features, and interface
  features are elementary building blocks in
  modularized modeling
• Modular models and their attributes and
  relations can be managed by commercial
  PDM-technology

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Open issues

• Methods for model verification and validation
• Management of uncertainties
• Automatic identification and connection of
  interfaces
• Query-driven simulations
• Coordination with standards - ISO 10303 (STEP)

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Data base system and product data management

From Orsborn (1996)
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The AMOS data model - basic constructs and
relations
From Orsborn (1996)
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Interface feature - a relational object
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Tools
Generic Tools
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CHIMAERA - an Ansys view
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