CRASH-97 - Refinement of the Trajectory Solution Procedure

970949

02/24/1997

Event
SAE International Congress and Exposition
Authors Abstract
Content
The trajectory solution procedures of the original CRASH program included both the SPIN routine and an exploratory trajectory simulation option to approximate and refine the linear and angular velocities at separation. The resulting separation speeds were then used to determine the impact speeds by means of application of the principle of conservation of linear momentum.
This paper presents a detailed review of the logic, rationale and limitations of the trajectory solution procedures of the original CRASH program and discusses a number of refinements including: incorporation of the principle of conservation of angular momentum, approximations of the effects of changes during collision in the positions and orientations of the two vehicles and of the effects of external forces and moments that act on the two-body system during the collision, and adaptations of optimization techniques for error reduction and convergence in iterative solutions.
The overall effects of the refinements to the CRASH trajectory algorithm on reconstruction results are illustrated by direct comparisons of results with SMAC reconstructions of full scale collision tests.
Meta TagsDetails
DOI
https://doi.org/10.4271/970949
Pages
21
Citation
McHenry, B., and McHenry, R., "CRASH-97 - Refinement of the Trajectory Solution Procedure," SAE Technical Paper 970949, 1997, https://doi.org/10.4271/970949.
Additional Details
Publisher
Published
Feb 24, 1997
Product Code
970949
Content Type
Technical Paper
Language
English