Vehicle dynamics

About: Vehicle dynamics is a research topic. Over the lifetime, 12909 publications have been published within this topic receiving 204091 citations.

A methodology for the design of robust rollover prevention controllers for automotive vehicles: Part 2-Active steering

Abstract: In this paper we apply recent results from robust control to the problem of rollover prevention in automotive vehicles. Specifically, we exploit the results of Pancake, Corless and Brockman, which provide controllers to robustly guarantee that the peak magnitudes of the performance outputs of an uncertain system do not exceed certain values. We use the dynamic Load Transfer Ratio LTRd as a performance output for rollover prevention, and design active-steering based rollover controllers to keep the magnitude of this quantity below a certain level, while we use control input u as an additional performance output to limit the maximum amount of control effort. We present numerical simulations to demonstrate the efficacy of our controllers.

Two-Stage Trajectory Optimization for Autonomous Ground Vehicles Parking Maneuver

Abstract: This paper proposes a two-stage optimization framework for generating the optimal parking motion trajectory of autonomous ground vehicles. The motivation for the use of this multilayer optimization strategy relies on its enhanced convergence ability and computational efficiency in terms of finding optimal solutions under the constrained environment. In the first optimization stage, the designed optimizer applies an improved particle swarm optimization technique to produce a near-optimal parking movement. Subsequently, the motion trajectory obtained from the first stage is used to start the second optimization stage, where gradient-based techniques are applied. The established methodology is tested to explore the optimal parking maneuver for a car-like autonomous vehicle with the consideration of irregularly parked obstacles. Simulation results were produced and comparative studies were conducted for different mission cases. The obtained results not only confirm the effectiveness but also reveal the enhanced performance of the proposed optimization framework.

Interoperable EV Detection for Dynamic Wireless Charging With Existing Hardware and Free Resonance

Abstract: The implementation of wireless charging for electric vehicles (EVs) in dynamic charging applications such as on highways typically requires extra hardware both in the vehicle and on the ground to detect the oncoming EV and energize the appropriate ground pads. A detection scheme is proposed in this paper that utilizes free resonant currents in the pad windings to detect small changes in coupling between neighboring ground pads as the EV moves over them. The detection scheme can be made to be interoperable with all magnetic pad topologies and utilizes components that already exist in most popular electronic converters and tuning networks. Specific implementation details with several different electronic topologies are discussed and the simulation results are presented showing the detection scheme working with a vehicle driving at 100 km/h. The experimental results demonstrating the vehicle detection with a dynamic charging system operating at 3.3 kW are also presented.

Simulation of Dynamic Effects of Vehicles on Pavement Using a 3D Interaction Model

Abstract: The present study formulated a three-dimensional (3D) vehicle-pavement coupled model to simulate the pavement dynamic loads induced by the vehicle-pavement interaction where both the vehicle vibration and pavement deformation were considered. Based on this model, the effects of road surface conditions, vehicle parameters, and driving speed on pavement dynamic loads were analyzed. The impact factor, dynamic load coefficient, and frequency distribution of pavement loads were mainly concerned in this study. The simulated results indicated that under rough road conditions the dynamic loads of vehicles are significantly higher than the static loads. The developed methodology can be used to further study the vehicle-induced pavement response, and the loading information will be useful in analyzing vehicle-induced pavement damage.