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Pulse Shape and Duration in Frontal Crashes
Technical Paper
2007-01-0724
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Understanding of events within the history of a crash, and estimation of the severity of occupant interior collisions depend upon an accurate assessment of crash duration. Since this time duration is not measured independently in most crash test reports, it must usually be inferred from interpretations of acceleration data or from displacement data in high-speed film analysis. The significant physical effects related to the crash pulse are often essential in reconstruction analyses wherein the estimation of occupant interior “second collision” or airbag sensing issues are at issue.
A simple relation is presented and examined which allows approximation of the approach phase and separation phase kinematics, including restitution and pulse width. Building upon previous work, this relation allows straightforward interpretation of test data from related publicly available test reports. The relation constitutes a closed-form model called BSAN, which represents the entire crash pulse by the specification of five readily available reconstruction parameters: closing velocity, approach time, maximum crush, coefficient of restitution, and total contact time. Of these, all but the time estimates are generally part of a normal crash reconstruction process. Relationships between the pulse shape, the “characteristic length” (or the “centroid time”) for a pulse representing a typical structure and test condition are explored as a means for improving time parameter estimates. Data from various crash tests of similar structures are compared to show examples of the selection of test parameters and applications of the estimation process. In representation of essential crash kinematics the BSAN model is shown for the test cases investigated to be manifestly superior to the rectangular, triangular, half-sine, and haversine approximations often used to represent the crash pulse.
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Citation
Warner, C., Warner, M., Crosby, C., and Armstrong, M., "Pulse Shape and Duration in Frontal Crashes," SAE Technical Paper 2007-01-0724, 2007, https://doi.org/10.4271/2007-01-0724.Also In
References
- [AAMA] American Automobile Manufacturers ’ Association … Sled Test Pulse Recommendations
- Agaram V. Xu L. We J. Kostyniuk G. Nusholtz G. “Comparison of Frontal Crashes in Terms of Average Acceleration” SAE Technical Paper 2000-01-0880 , Society of Automotive Engineers Warrendale, PA 2000
- Brach R.M Brach R.M. Vehicle Accident Analysis and Reconstruction Methods SAE International Warrendale, PA 2005
- Brach R.M. “Impact Analysis of Two-Vehicle Collisions” SAE Paper 830468 , Society of Automotive Engineers Warrendale, PA 1983
- Chan C.Y. Fundamentals of Crash Sensing in Automotive Air Bag Systems SAE International Warrendale, PA 2000
- Cheng P. H. Tanner C. B. Chen H. F. Durisek N. J. Guenther D. A. “Delta-V, Barrier Equivalent Velocity and Acceleration Pulse of a Vehicle During an Impact” SAE Technical Paper 2005-01-1187 , Society of Automotive Engineers Warrendale, PA 2005
- Cheva W. Yasuki T. Gupta V. Mendis K. “Vehicle Development for Frontal/Offset Crash Using Lumped Parameter Modeling” SAE Paper 960437 , Society of Automotive Engineers Warrendale, PA 1996
- Emori R. I. Baird J. D. “Data Retrieval by Accident Reconstruction for Safer Vehicle Design” SAE Paper 720284 , Society of Automotive Engineers Warrendale, PA 1972
- Emori R. I. “Analytical Approach to Automobile Collisions” SAE Paper 680016 , Society of Automotive Engineers Warrendale, PA 1968
- Fileta B. Liu X. “Predicting Vehicle Crash Performance in Offset Barrier Impact” 218 Crashworthiness and Occupant Protection in Transportation Systems, ASME 1996
- Grime G. Jones I. “Car Collisions – The Movement of Cars and Their Occupants in Accidents” Proceedings of the Institution of Mechanical Engineers 184 5 1969 70
- Huang M. Vehicle Crash Mechanics, See Chapter 2 SAE International/CRA Press New York, NY
- Huang M. Cuddihy M. A. Drummond J. B. Jr “Effects of Vehicle Impact Mode and Speed on Air Bag Single Point Sensing Requirements” ASME Winter Annual Meeting New Orleans, LA Nov. 28 Dec. 3 1993
- Huang M. Lawson G. P. Powell B. K. Walker J. H. “Characterization of Vehicle Deceleration Time Histories in the Analysis of Impact Dynamics” SAE Paper 770013 , SAE International Automotive Engineering Congress and Exposition February 28 March 4 Detroit, Michigan 1977
- James M. B. Smith G. C. Kent R. W. Perl T. R. “Residual Crush and Δ V as Post-collision Evaluators of Airbag System Performance” SAE Paper 99SF034, Society of Automotive Engineers Warrendale, PA., 1994
- Lawrence J.M. Wilkinson C.C. King D.J. Heinrichs B.E. Siegmund G.P. “The Accuracy and Sensitivity of Event Data Recorders in Low-Speed Collisions” SAE Technical Paper 2002-01-0679 , Society of Automotive Engineers Warrendale, PA 2005
- Lundstrom L. C. “The Safety Factor in Automotive Design” Highway Vehicle Safety, (Collected SAE Papers, 1961-1967, # 660539 ), Society of Automotive Engineers Warrendale, PA 1966
- Martin D. E. Lundstrom L. L. “Analysis of Occupant Restraint Systems” SAE Paper 750396 , Society of Automotive Engineers Warrendale, PA 1975
- McHenry R. R. McHenry B. G. “Effects of Restitution in the Application of Crush Coefficients” SAE Paper 970960 , Society of Automotive Engineers Warrendale, PA 1997
- McHenry R. R. “A Revised Damage Analysis Procedure for the CRASH Computer Program” SAE 861894 , Technical Paper 960887 , Society of Automotive Engineers Warrendale, PA 1986
- McHenry R. R. “The CRASH Program - A Simplified Collision Reconstruction Program” Paper prepared for the Motor Vehicle Collision Investigation Symposium Calspan Corporation Buffalo, New York 10 October 1975
- R & D Vehicle Database & Software < http://www-nrd.nhtsa.dot.gov >
- Prasad A. K. “Coefficients of Restitution of Vehicle Structures and its Use in Estimating the Total Δ V in Automobile Collisions”, AMD” 126 19 Crashworthiness and Occupant Protection in Transportation Systems, ASME New York, NY 1991
- Rose N.A. Fenton S. J. Beauchamp G. “Restitution Modeling for Crush analysis: Theory and Validation” SAE Technical Paper 2006-01-0908 , Society of Automotive Engineers Warrendale, PA 2006
- SAE Handbook, Recommended Practice J 1980, Society of Automotive Engineers Warrendale, PA 2003
- Siegmund G. King D. Montgomery D. “Using Barrier Impact Data to Determine Speed Change in Aligned, Low-Speed Vehicle-to-Vehicle Collisions” SAE Technical Paper 960887 , Society of Automotive Engineers Warrendale, PA 1996
- Strother C. Woolley R. James M. Warner C. “Crush Energy in Accident Reconstruction” SAE Paper 860371 , Society of Automotive Engineers Warrendale, PA 1986
- Tanner C. B. Wiechel J. Bixel R. Cheng P. Guenther D. Cassidy M. “Coefficients of Restitution for Low and Moderate Speed Impacts with Non-Standard Impact Configurations” SAE Technical Paper 2001-01-0891 , Society of Automotive Engineers Warrendale, PA 2001
- Varat M. S. Husher S. E. “Crash Pulse Modeling for Vehicle Safety Research” 18 th ESV Paper 2003
- Varat M. S. Husher S. E. “Vehicle Impact Response Analysis Through the Use of Accelerometer Data” SAE Paper 2000-01-0850 , Society of Automotive Engineers Inc., Warrendale, Pa March 2000
- Warner C. Y. Allsop D. Germane G. “A Repeated-Crash Test Technique for Assessment of Structural Impact Behavior” SAE Paper 860208 , Society of Automotive Engineers Warrendale, PA 1986
- Warner C. Y. Anderson D. Albrecht H. “A Critique of the CRASH Accident Reconstruction Computer Program” International Symposium on Automotive Technology and Automation Wolfsburg, Germany September 1978
- Warner C. Y. Perl T. R. “Accuracy and Usefulness of SMAC” SAE Paper 780902 , 22 nd STAPP, Ann Arbor, MI October 1978
- Warner C. Y. Warner M. H. Crosby C. L. Armstrong M. J. Characterization of Crash Pulse Physics in Reconstructed Frontal Crashes” copyright Delta-V Technology LC, Orem, Utah 2007
- Warner C. Y. et.al. “The KINETAU Program for Vehicle-to-Vehicle Crash Kinematics Computations” copyright BCM LC, Orem, Utah 2007