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The “IMPAC” Program for Collision Analysis
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English
Abstract
The “IMPAC” collision algorithm is a comparatively simple application of momentum conservation in a collision. This 2-D model may be used in a number of applications: to reconstruct car to car collisions, to study car to barrier collisions, to evaluate proposed crash test conditions, to refine and check reconstruction calculations made using the “damage” option of “Crash3”, or as a predictor for the “SMAC” program to reduce the number of runs required to obtain a reconstruction. The program also provides a means of rapidly evaluating questions of sensitivity of results to changes in input. The essential features of the model are reviewed herein and two collision configurations are examined. The most recent version of the program provides output for purposes of comparison with the method employed by the “Damage” option of the “Crash3” program.
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Citation
Woolley, R., "The “IMPAC” Program for Collision Analysis," SAE Technical Paper 870046, 1987, https://doi.org/10.4271/870046.Also In
References
- Woolley, Ronald. L. “The IMPAC Computer Program for Accident Reconstruction” SAE 850254 Field Accidents: Data Collection, Analysis, Methodologies, and Crash Injury Reconstructions February 1985
- Solomon, Paul J. “The Simulation Model of Automobile Collisions (SMAC) Operations Manual” Accident Investigations Division, NHTSA Washington, D.C. October 4 1974
- 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
- Anderson, Dale O. “The VTS Single-Vehicle Trajectory Simulation” SAE 850252 Field Accidents: Data Collection, Analysis, Methodologies, and Crash Injury Reconstructions February 1985
- Strother, Charles E. Woolley, Ronald L. James, Michael B. Warner, Charles Y. “Crush Energy in Accident Reconstruction” SAE 860371 Passenger Comfort, Convenience and Safety: Test Tools and Procedures February 1986
- Woolley, Ronald. L. “Inaccuracies in the CRASH3 Program” SAE 850254 Field Accidents: Data Collection, Analysis, Methodologies, and Crash Injury Reconstructions February 1985
- Woolley, Ronald L. “User's Guide to Program CRUSH” CSE December 1984
- 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, 10017 November 1980
- Woolley, Ronald L. “IMPAC User's Guide and Technical Manual” CSE December 1984
- McHenry, Raymond “User's Manual for the CASH3 Computer Program” CALSPAN Report ZQ.5708-V-3 January 1976
- Smith, Gregory C. “Plastic Collision Momentum Conservation for Angled Impacts” Programmed for HP41CX Calculator Collision Safety Engineering Library August 1986