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Title:

HIERARCHY OF SYMBOLIC COMPUTER-GENERATED REAL-TIME VEHICLE DYNAMICS MODELS

Accession Number:

00639992

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Symbolic multibody code generation technology enables a new approach for developing vehicle models for driving simulators. Rather than assembling terms in the equations of motion, a modeler can concentrate on modeling issues such as degrees of freedom (df), joint constraints, and kinematical assumptions. An automated code generator makes it practical to test many modeling assumptions to determine their influence on computation time and simulation fidelity, leading to a model that offers the most fidelity while running in real time on available hardware. The new methodology is illustrated by (a) describing seven vehicle handling models, with various levels of complexity, ranging from 4 to 10 df; (b) comparing the computational requirements for their use; and (c) presenting example comparisons of predicted motions. All of the models can be simulated in real time on a fast personal computer. The simplest (4-df) model runs more than 40 times faster than the more complex 10-df one, yet it predicts overall vehicle motions that agree closely. Among the 10-df models, the fastest runs 2.3 times quicker than the slowest. The methodology illustrated can be used to extend the models to include additional mechanical characteristics of interest.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1403, Driver Performance: Measurement and Modeling, IVHS, Information Systems, and Simulation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

00669186

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Sayers, Michael W
Fancher, Paul

Pagination:

p. 88-97

Publication Date:

1993

Serial:

Transportation Research Record

Issue Number: 1403
Publisher: Transportation Research Board
ISSN: 0361-1981

Features:

Figures (14) ; References (14) ; Tables (2)

Old TRIS Terms:

Subject Areas:

Highways; Safety and Human Factors; I83: Accidents and the Human Factor

Files:

TRIS, TRB, ATRI

Created Date:

Dec 20 1993 12:00AM

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