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Technical Paper

Validation of a PC-Crash Multibody Sport Bike Motorcycle Model

2021-04-06
2021-01-0893
PC-Crash is an accident reconstruction program that allows the user to run simulations with multibody objects that collide or interact with 3D vehicle mesh models. ...The current motorcycle models in PC-Crash are limited to generic-type motorcycles. Furthermore, they are only globally scalable such that you cannot adjust length, width, or height independently. ...The testing results were compared to parameters calculated in the PC-Crash program. Results such as Delta-V, yaw rate and overall post impact trajectories of the motorcycle, rider, and movement of the target vehicle were compared.
Technical Paper

Characterizing Regenerative Coast-Down Deceleration in Tesla Model 3, S, and X

2020-04-14
2020-01-0883
Tesla Motors vehicles utilize a regenerative braking system to increase mileage per charge. The system is designed to convert the vehicles’ kinetic energy during coast-down into electrical potential energy by using rotational wheel motion to charge the batteries, resulting in moderate deceleration. During this coast-down, the system will activate the brake lights to notify following vehicles of deceleration. The goals of this study were to analyze and quantify the regenerative braking behavior of the Tesla Model 3, S, and X, as well as the timing and activation criteria for the brake lights during the coast-down state. A total of seven Tesla vehicles (two Model 3, three Model S and two Model X) were tested in both Standard and Low regenerative braking modes. All three Tesla models exhibited similar three-phase behavior: an initial ramp-up phase, a steady-state phase, and a non-linear ramp-down phase at low road speeds. Phase 1 was less than one second in length.
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