Journal Article Title: Barrier Equivalent Speed and Delta-V
Article Author(s): HICKMAN, ROY S., PH.D., P.E.
Volume: 12
Volume #: 2
Month: December
Year: 1995

Download this paper

Abstract:

An analysis is presented for a collision in which only linear momentum must be treated. Thus, the principle direction of forces must pass through or near the center of mass of each vehicle. The analysis utilizes the well-known linear crush model. Linear momentum, energy, and continuity of crush forces allow the change of velocity of an impacting vehicle to be computed independently of the EBS speed. In general, the EBS speed is not equal to the change of velocity (Delta V) for a vehicle. An explicit formula is presented to compare Delta V and the EBS speed... This paper addresses a crash in which the crush data for one car is unavailable or in which the loading on one vehicle is very dissimilar to that produced by a barrier test. A way of estimating the change of velocity of both vehicles is presented. An energy balance, a momentum balance and the requirement that contact forces are equal will be used. Neptune et al have presented a numerical method based upon the CRASH 3 program in which this type of accident can be analyzed. The analysis presented here is analytical in approach and cannot be applied to accidents in which significant rotation of the vehicles occur, If the vehicles rotate more than about 10 degrees, one must account for angular momentum and a computer analysis based upon a program like EDSMACs is necessary.