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The “IMPAC” Computer Program for Accident Reconstruction
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English
Abstract
The computer program “IMPAC” (impact Momentum of a Planar Angled Collision) was developed for use in accident reconstruction to study the impact phase of a collision. It may be used for vehicle to vehicle or vehicle to fixed object impacts. Collisions are modeled as a vector impulse in two-dimensions taking place at a specified point in each two-dimensional vehicle. A common velocity is reached at this point for the inelastic collision with complete lockup. An optional condition is available to study sideswipe type collisions in which the colliding points are permitted to slide relative to each other at a prescribed speed along a defined plane of slip. The program has been validated by comparison with the data from 16 staged crash tests conducted by the NHTSA.
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Citation
Woolley, R., "The “IMPAC” Computer Program for Accident Reconstruction," SAE Technical Paper 850254, 1985, https://doi.org/10.4271/850254.Also In
References
- NHTSA “CRASH-3 user's Guide and Technical Manual” U.S. Department of Transportation, National Highway Traffic Safety Administration, National Center for Statistics and Analysis, Accident Investigation Division Washington, D.C. 29590
- Solomon, Paul J. “The Simulation Model of Automobile Collisions (SMAC) Operations Manual” Accident Investigations Division, NHTSA Washington, D.C October 4 1974
- Burden, Richard L. Faires J. Douglas Reynolds Albert C. “Numerical Analysis” Prindle, Weber & Schmidt Boston, Mass.
- Smith, R.A. Noga, J.T. “Examples of Staged Collisions in Accident Reconstruction” Highway Collision Reconstruction ASME 345 East 47th Street, New York, New York November 1980
- Woolley, Ronald L. “IMPAC User's Guide and Technical Manual” CSE December 1984
- Anderson, Dale O. “VTS User's Manual” CSE August 1984
- Woolley, Ronald L. “User's Guide to Program CRUSH” CSE December 1984