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Technical Paper

2018-04-03
2018-01-0523
Technical Paper

An Examination of Equations Relating Motorcycle Impact Speed to Struck Vehicle Post-Impact Rotational Displacement

2021-04-06
2021-01-0895
The most general and comprehensive solution will be to use one of the widely-accepted accident reconstruction simulation programs – PC-Crash, HVE (the EDSMAC4 or SIMON modules), or Virtual CRASH. These software packages incorporate equations for calculating the velocity changes that occur when the vehicles collide and equations for calculating the post-impact motion of the vehicles.
Technical Paper

Post-Impact Dynamics for Vehicles with a High Yaw Velocity

2016-04-05
2016-01-1470
Calculating the speed of a yawing and braked vehicle often requires an estimate of the vehicle deceleration. During a steering induced yaw, the rotational velocity of the vehicle will typically be small enough that it will not make up a significant portion of the vehicle’s energy. However, when a yaw is impact induced and the resulting yaw velocity is high, the rotational component of the vehicle’s kinetic energy can be significant relative to the translational component. In such cases, the rotational velocity can have a meaningful effect on the deceleration, since there is additional energy that needs dissipated and since the vehicle tires can travel a substantially different distance than the vehicle center of gravity. In addition to the effects of rotational energy on the deceleration, high yaw velocities can also cause steering angles to develop at the front tires. This too can affect the deceleration since it will influence the slip angles at the front tires.