Comprehensive Analysis and Optimization of Dynamic Vibration-Absorbing Structures for Electric Vehicles Driven by In-Wheel Motors

Abstract

Distributed-drive electric vehicles (EVs) replace internal combustion engine with multiple motors, and the novel configuration results in new dynamic-related issues. This paper studies the coupling effects between the parameters and responses of dynamic vibration-absorbing structures (DVAS) for EVs driven by in-wheel motors (IWM). Firstly, a DVAS-based quarter suspension model is developed for distributed-drive EVs, from which nine parameters and five responses are selected for the coupling effect analysis. A two-stage global sensitivity analysis is then utilized to investigate the effect of each parameter on the responses. The control of the system is then converted into a multiobjective optimization problem with the defined system parameters being the optimization variables, and three dynamic limitations regarding both motor and suspension subsystems are taken as the constraints. A particle swarm optimization approach is then used to either improve ride comfort or mitigate IWM vibration, and two optimized parameter sets for these two objects are provided at last. Simulation results provide in-depth conclusions for the coupling effects between parameters and responses, as well as a guideline on how to design system parameters for contradictory objectives. It can be concluded that either passenger comfort or motor lifespan can be reduced up to 36% and 15% by properly changing the IWM suspension system parameters.This section introduces the two-step GSA and analyzes the effects each parameter has on the system response characteristics.

Pavement grade recognition algorithm based on sprung mass acceleration

“…The hybrid control algorithm combines the ideas of ceiling control and floor control [6][7][8] . Canopy control model is a semiactive suspension control algorithm proposed by Karnopp.…”

In-Wheel Motor Vibration Control for Distributed-Driven Electric Vehicles: A Review

“…The DVAS consists of a spring and an internal damper, and the DVAS damper can be continuously adjusted to reduce the motor stator vibration and isolate the force transmitted to the motor bearing [29]. Compared with the conventional IWM structure, DVAS can effectively improve ride comfort and reduce IWM vibration [27,30].…”

“…Furthermore, when the IWMs electro-mechanical-magnetic coupling dynamics are considered, the unbalanced electromagnetic force (UEMF), which is induced by the airgap vibration, was modelled and its effect on vehicle dynamics was investigated [27]. In addition, a large number of studies focused on the vibration reduction for IWMsuspension systems, such as motor-structure optimization, controller development, and the application of controllable suspension-components [23,[28][29][30]. Currently, most of such research is based on finite element method and numerical simulation, and the adoption of a simplified vehicle model leaves the comprehensive description of the coupling effect between IWM and vehicle an open question.…”

Dynamic Performance Analysis of Semiactive Vehicle ISD Suspension Based on the Power-Driven-Damper Strategy

“…Vehicle suspension is an essential component of the chassis system, and it can bufer the impact of road roughness [1,2] and play a decisive role in providing passengers with excellent ride comfort performance [3,4]. Terefore, improving the performance of suspension has important engineering signifcance.…”