1994-03-01

Conservation of Momentum Analysis of Two-Dimensional Colliding Bodies, With or Without Trailers 940566

This paper presents a method of automobile collision analysis based on conservation of momentum. The analysis is applied to the collision of two two-dimensional bodies, either or both of which may be attached to a trailer.
Newton's laws of motion are employed to determine changes in linear and angular velocities for the two-dimensional colliding bodies. Knowing the masses and rotational inertias and the initial velocities of all bodies at impact, the post-impact velocities can be calculated if appropriate constraints are applied to the bodies' post-collision motion. Various motion constraints, including lock-up, slip, and restitution are examined, and a methodology for modeling vehicle motion experienced during a collision is presented. The full set of basic equations characterizing this conservation-of-momentum analysis is presented with sufficient detail to allow their implementation on a programmable calculator or personal computer.
A Windows™-based computer program written to implement the method is introduced. Called PLASMO, the program's accuracy is briefly examined by comparison to previously published reconstructions of instrumented crash tests.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X