7
Fenyes 4/14/04 Multidisciplinary Analysis and Optimization of Vehicle Architectures Peter A. Fenyes General Motors R&D and Planning Vehicle Development Research Laboratory Presented at MIT 4/14/04 for 16.888/ESD.77J Multidisciplinary System Design Optimization (MSDO) Prof. Olivier de Weck and Prof. Karen Willcox …. Designing Great GM Cars and Trucks !

Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

  • Upload
    others

  • View
    3

  • Download
    0

Embed Size (px)

Citation preview

Page 1: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

1

Fenyes4/14/04

Multidisciplinary Analysis and Optimization of Vehicle Architectures

Peter A. FenyesGeneral Motors R&D and Planning

Vehicle Development Research Laboratory

Presented at MIT 4/14/04 for

16.888/ESD.77JMultidisciplinary System Design Optimization

(MSDO)Prof. Olivier de Weck and Prof. Karen Willcox

Fenyes4/14/04

…. Designing Great GM Cars and Trucks !

Page 2: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

2

Fenyes4/14/04

Multidisciplinary Analysis and Optimization of Vehicle Architetctures

Outline

• The vehicle design process– Early stage vehicle design– Vehicle architecture

• Parametric vehicle representation to support MAO• Multidisciplinary analysis and optimization

– Engineering, manufacturing, business

• Example vehicle design problem• MAO challenges

Fenyes4/14/04

General Motors R&Dhttp://www.gm.com/company/careers/career_paths/rnd/lab.html

Chemical & Environmental SciencesReaffirming GM's environmental principles

Electrical & Controls IntegrationEnabling electronics-based, driver-friendly, smart GM cars and trucks

Manufacturing Systems ResearchTransforming the enterprise through math-based processes and systems

Materials and ProcessesAdapting tomorrow's materials for

today's automobiles

Powertrain Systems ResearchDeveloping high-value, energy-efficient, high-

performance powerplants and drivetrains

Vehicle Development ResearchSpeeding and enhancing engineering

design and development

Page 3: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

3

Fenyes4/14/04

Vehicle Development Research Lab

• What do we work on?– Safety Systems– Lightweight Materials– Work Systems– CAE Methods– Vehicle Design– Virtual Reality– Mechametronics– Quality Methods

Fenyes4/14/04

Vehicle Design Design and Analysis Timeline

Des

ign

freed

om

Des

ign

deta

il (#

des

ign

para

met

ers)

Conceptual design Detail design

HIGH ARMS LANON-DRIVEN

STRUTSW/COILS

Componentselection

Topology design Parametric geometry

WBL

FO RO

GC

FH RH

LA

LF

LB

LR

LD

LH

h

b

Structures

Aerodynamics

Solar Load

OccupantDynamics

Ride & Handling

FuelEconomy

Crashworthiness

OtherAnalyses*

Representation

System Analysis

Time

Balance requirements

Detailed Analysis

Part design Manufacturing design

Page 4: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

4

Fenyes4/14/04

How Can MAO be Applied in Vehicle Design?

• Most effective application during early vehicle development– Vehicle “balance and integration”– This will be the focus of our discussion

• Can be applied in more detailed phases of design– Example: tradeoffs for aerodynamics and structure– Example: tradeoffs in component design

Fenyes4/14/04

Example: Architecture Selection Problem

New vehicle requirements

#1#2

#3#4

#5

Populated Databases- Architectures- Materials- Processes

0

1

2

3

4

Arch#1

Arch#3

Arch#5

Concept Description

- Fuel economy

- Wheelbase

- Interior volume

- Bending stiffness

Profit by ArchitectureDesign

Representation(Unigraphics)

Database(MS Access)

Multidisciplinary Optimization

(iSIGHT)

Structural Analysis

(NASTRAN)

Fuel Economy(EconoSTRAT)

Market Share(InSight)

Aerodynamics(ASD)

Interior Roominess

(Excel)

BIW Cost(IBIS)

Facilities Investment

(QuickStudy)

Profitability(Excel)

Summary of Results(Excel)

Design for profit

Considerations

• Multiple derivatives/multiple requirements

• Vehicle performance

• Material/process strategy

• Financial/marketing

ParametricArchitectures

Page 5: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

5

Fenyes4/14/04

Consider the Key Components of an MDO System

Elastic Structures

External Aerodynamics

Solar Load

Occupant Dynamics

Suspension Loads

Fuel Economy

Crashworthiness

Other Analyses*

ResultsDatabase

VehicleDatabase

Para

met

ric

Mod

eler

Dis

cipl

ine

M

odel

ers

Library Data

Library Data

TemplatesTemplates

User Input

Mul

tidis

cipl

inar

y

Opt

imiz

atio

n

Dis

cipl

ine

Ana

lysi

s &

S

ensi

tivity

Cal

cula

tions

Par

amet

ric R

epre

sent

atio

n

Fenyes4/14/04

Parametric Design Representation

• The shared common representation is used to generate analysis input for ALL disciplines

• Need a single consistent representation for architecture and derivatives• Combine UG geometry with non-geometric database

– UG parametric model– BOM data - available/allowable components– Marketing data

Page 6: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

6

Fenyes4/14/04

Consistent Parametric Design RepresentationThe shared common representation used to generate analysis input for ALL disciplines

• Geometric, non-geometric data

– Templates• Data to be varied parametrically

– Stored in parametric CAD system

– Library data• Data remains fixed (components) - location, orientation/location may change

– Parametric CAD system– Auxiliary database information

– User input• Selection and location of components, settings of dimensional parameters

HIGH ARMSLANON-DRIVEN

P=125

P=63

Fenyes4/14/04

Parametric Design Representation

• Combines– Parametric geometry (Unigraphics)– Non-geometric configuration data (MS Access)

• Many parameters available– High level architecture variables– Detail level component variables

WBL

FO RO

GC

FH RH

LA

LF

LB

LR

LD

LH

h

b

W

T

H

WR

BL

Page 7: Multidisciplinary Analysis and Optimization of Vehicle ... · – Library data • Data remains fixed (components) - location, orientation/location may change – Parametric CAD system

7

Fenyes4/14/04

Parametric Geometry Driving Discipline Analysis

High level input parametersWheel baseOverhangsAxle positionsWidth...

Packaging Occupant, section dimensions, BOM items, …

MeasuresAreas, lengths, volumes, angles, …

Aerodynamics….

Resulting geometry used for:

Fenyes4/14/04

Parametric GeometryParametric Dimensions and Occupant Placement