00464606

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http://onlinepubs.trb.org...trr/1987/1111/1111-017.pdf

https://scholar.google.co...ONDA&publication_year=1987

A complete rederivation of the computer program CRASH is presented, with confirmation of its theoretical basis, elimination of many of its actual or supposed restrictions, and additions to its useful outputs. The physics and algebra, although clarified, are for the most part unchanged. However, in the trajectory solution, a closed-loop iteration replaces a best-fit form of solution. In the impulse solution, the physical basis of the common velocity check is clarified, the check is revised so that more cases can be treated, and the coefficient of restitution is found. In the damage solution, delta-V accuracy is improved by better fits to crash test data, corrected treatment of oblique impact, and inclusion of the energies of restitution and inter-vehicular sliding. Yaw rates and impact forces are found from the impulse solution and again from the damage solution; these and other paired output comparisons indicate the quality of the reconstruction and facilitate its refinement.

Publication of this paper sponsored by Committee on Traffic Records and Accident Analysis. 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

00496549

pp 138-149

1987

Transportation Research Record

0-309-04463-4

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Figures (2) ; References (18) ; Tables (2)

Accuracy; Computer programs; Crash reconstruction; Functions (Mathematics); Impacts; Improvements; Loss and damage; Traffic crashes; Trajectory; Vehicle trajectories; Yaw

Coefficient of restitution

Highways; Safety and Human Factors; I81: Accident Statistics

TRIS, TRB

Dec 31 1987 12:00AM

• A METHOD OF CALCULATING THE EFFECTIVE INTENSITY OF MULTIPLE-FLICK FLASHTUBE SIGNALS
• A STUDY OF ROUTE SELECTION FROM HIGHWAY MAPS (ABRIDGMENT)
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• ANALYSIS OF HIGH-HAZARD LOCATIONS: IS AN EXPERT SYSTEMS APPROACH FEASIBLE?
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• EVALUATION OF OPPORTUNITY-BASED ACCIDENT RATE EXPRESSIONS
• EVALUATION OF THE EFFECTIVENESS OF CRASH CUSHION DELINEATION
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• VALIDATION OF A NONAUTOMATED SPEED DATA COLLECTION METHODOLOGY
• VIDEO COLLISION RECONSTRUCTION USING PHYSICAL EVIDENCE