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Essential Considerations in Delta-V Determination
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 1, 2001 by SAE International in United States
Annotation ability available
While Delta-V has been one of the most used indicators of accident severity for vehicle occupants, its actual determination remains a mystery to many who refer to it and use it. Delta-V is a term of art applied to a rapid change in vehicle velocity caused by impact forces during a collision. The Delta-V is associated with the high decelerations, which cause it and are applied to the occupants through restraint systems and collisions with the interior of the vehicle.
This paper will serve as a primer for those new to the subject and a review for those who are familiar with the subject. Previous works by the authors will be referenced and other pertinent literature and data sources will be discussed. The analytical methods and test data used to calculate Delta-V will be presented and the relationship between Delta-V and other measures of impact severity, such as Barrier Equivalent Velocity and Energy Equivalent Speed will be discussed. The use of air bag sensor data will be included. The paper will discuss how various parameters and variables can affect the Delta-V, such as relative mass and stiffness of vehicles in vehicle-to-vehicle collisions, the collision geometry and the pre-impact motions of the vehicles.
CitationFay, R. and Scott, J., "Essential Considerations in Delta-V Determination," SAE Technical Paper 2001-01-3165, 2001, https://doi.org/10.4271/2001-01-3165.
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
- Crash3 User's Guide and Techincal Manual. US Department of Transportation, National Highway Traffic Safety Administration. Revised, April, 1982.
- Robinette, Ric D., Fay, Richard J., and Paulsen, Rex E. “Delta-V: Basic Concepts, Computational Methods, and Misunderstandings.” SAE Paper No. 940915, February, 1994.
- EDCRASH User Manual, Engineering Dynamics Corp., Beaverton, OR, USA.
- Fay, Richard J., et. al. “The Effect of Vehicle Rotation on the Occupant's Delta-V.” SAE Paper No. 960649.
- Emori, R. “Mechanics of Automobile Collisions.” First International Conference on Vehicle Mechanics, Wayne State University, Detroit, MI, 1968.
- Brach, Raymond, “Energy Loss in Vehicle Collisions.” SAE Paper No. 871993, February, 1987.
- Woolley, Ronald L., “Non-Linear Damage Analysis in Accident Reconstruction.” SAE Paper No. 2001-01-0504, 2001.
- Campbell, K., “Energy Basis for Collision Severity.” SAE Paper no. 740565, 1974.
- Kerkhoff, J. F., Varat, M.S., Busenga, A.M., Hamilton, K., and Husher, S.E., “An Investigation into Vehicle Frontal Impact Stiffness, BEV and Repeated Testing for Reconstruction.” SAE Paper No. 930889, 1993.
- PC-Crash Technical Manual, Version 5.1.
- PC-Crash User Manual, Version 5.1.
- SMAC is a public domain computer program for studying automotive collisions. It was developed by CALSPAN under contract to the National Highway Traffic Safety Administration in the early 1970's.
- EDSMAC is a product of Engineering Dynamics Corp., which has been presented in SAE papers.
- EDSMAC4 is a product of Engineering Dynamics Corporation, which has been presented in SAE papers.
- WinSMAC and WinCRASH are products of ARSoftware, Redmond, WA, USA.
- CRASHEX is a product of Fonda Engineering Associates, King of Prussia, PA, USA.
- m-crash is a product of McHenry Software, Cary, NC, USA.
- m-smac is a product of McHenry Software, Cary, NC, USA.
- AR-98 is a product of Maine Computer Group, Sarasota, Florida, USA.
- LARM, Linear and Rotational Momentum, and LARM II are products of ProSource Software, Provo, Utah, USA.
- Fay, Richard; Robinette, Ric; Scott, John and Fay, Patrick, “PC-Crash and HVE, an Overview of Similarities and Differences,” SAE Paper No. 2001-01-0505.
- “Vehicle Crush Stiffness Coefficients for Model Years 1970-1984.” Engineering Dynamics Corp. Library Reference No. 1043, Beaverton, Oregon.
- “Stiffness Coefficients for Vehicle Model Years 1960-1992,” Neptune Engineering, Inc.
- Siddal, Day, “Updating the Vehicle Crush Stiffness Coefficients.” SAE Paper No. 960897.
- “NHTSA Crash Test Data on CD,” KEVA Engineering, Somis, CA.
- FHWA/NHTSA National Crash Analysis Center, George Washington University, USA.
- Hargens, Randall L., and Day, Terry D., “Vehicle Data Sources for Accident Reconstruction.” SAE Paper No. 880070, 1988.
- Neptune, James A., Blair, George Y., and Flynn, James E., “A Method for Quantifying Vehicle Crush Stiffness Coefficients.” SAE Paper No. 920607, 1992.
- Neptune, James A., and Flynn, James E., “A method for Determining Accident Specific Crush Stiffness Coefficients.” SAE Paper No. 940913, 1994.
- Tumbas, Nicholas S., and Smith, Russel A., “Measuring Protocol for Quantifying Vehicle Damage from an Energy Basis Point of View.” SAE Paper No. 880072, 1988.