Abstract
This study presents a new dynamic modeling of a vehicle by considering the engine dynamics. By selecting the vehicle coordinate system as the reference frame, all the force-torque equations of the sprung mass and unsprung masses are derived in this coordinate system by using the Newton’s equations of motion. Unlike the previous researches, in this work the sprung mass of the vehicle is not considered as a rigid body. The dynamics of the sprung mass components, such as gyroscopic effects of the engine crankshaft, is considered. In order to study the vehicle's dynamic behavior, in the J-turn maneuver, the governing equations of the full-car model are evaluated and validated by the numerical simulation method and ADAMS/Car software. Based on the results, the maximum roll angle and roll rate of a vehicle reach about 8 degrees and 40 degrees per second, respectively.
Highlights
Safety assessment is one of the most important issues in the automotive industry
This study presents the dynamics of a 15-DOF model of a vehicle by performing simulations to investigate the vehicle’s dynamic behavior in the J-turn maneuver under the supervision of the phase IV of National Highway Traffic Safety Administration (NHTSA)’s light vehicle rollover research program
Using the Newton’s equations of motion, the equations of motion for the sprung and unsprung masses are all written in the vehicle coordinate system
Summary
Safety assessment is one of the most important issues in the automotive industry. The safety of vehicles can be examined from two perspectives: the pre-crash safety and post-crash safety. Understanding the dynamic behavior of a vehicle in standard maneuvers can be effective in assessing its stability. A set of experimental examinations was performed to evaluate the actual dynamic behavior of a vehicle in various standard maneuvers [1], from which the phase IV rollover tests of the National Highway Traffic Safety Administration (NHTSA) [2] can be pointed out. This study, by presenting a 15-DOF model of the vehicle dynamics, considers reducing the complexity of the model to the extent that it would be acceptable for the dynamic behavior of the vehicle studying and modeling the necessary subsystems, such as tire and engine, with sufficient accuracy. Dynamic behavior and stability of a vehicle in the J-turn maneuver is simulated by the Newmark numerical method under the supervision of the NHTSA, [25]
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