Abstract
In this study, the parameters of the MacPherson front suspension and the E-type multilink rear suspension are matched to enhance the vehicle ride comfort on bump road. Vehicle vibration and suspension stiffness are analyzed theoretically. In the simulation study, the influence of the front and rear wheels on the vehicle vibration is considered, so the time-domain curves of the front and rear seat rail accelerations are processed by adding windows with two different window functions. The resulting ΔRmsLocal and ΔRmsGlobal are used as evaluation indexes of the vehicle ride comfort. The sensitivity analysis yields the magnitude of the influence of the suspension parameters on the evaluation indexes. In addition, the trends of ΔRmsLocal and ΔRmsGlobal with bushing stiffness at different vehicle speeds are discussed. The results show that longitudinal ΔRmsLocal and ΔRmsGlobal of the seat rails are influenced by the bushings mostly, while the vertical ΔRmsLocal and ΔRmsGlobal of the seat rails are influenced by the spring and shock absorber mostly. The trends of ΔRmsLocal and ΔRmsGlobal with bushing stiffness are influenced by the speed of the vehicle. Finally, the vehicle ride comfort is enhanced after optimization and matching of the suspension parameters by NSGA-II optimization algorithm.
Highlights
Vehicle ride comfort refers to keeping the impact of vibrations and shocks within certain ranges when the vehicle is excited by the road. e study of vehicle ride comfort has always been a subject of interest for scholars
Zhao et al [6] established a vibration simulation model of a three-axle goods vehicle passing through a speed bump. e vibration characteristics of the vehicle at different speeds were studied through the simulation, the vibration decay time at different speeds was obtained, and the minimum distance between the speed bump and the vehicle scale was determined
The parameters of the MacPherson front suspension and the E-type multilink rear suspension are matched reasonably to enhance the vehicle ride comfort on bump road. e following conclusions are drawn: (1) e longitudinal stiffness of the front suspension is influenced by the stiffness TYB of the bushing B mostly. e longitudinal stiffness of the rear suspension is influenced by the stiffness TXA4 of the bushing A4 mostly
Summary
Vehicle ride comfort refers to keeping the impact of vibrations and shocks within certain ranges when the vehicle is excited by the road. e study of vehicle ride comfort has always been a subject of interest for scholars. Rough simulation studies, the proposed optimal controller is shown to have the advantages of less power and faster convergence He et al [18] developed and simulated a multibody dynamics model based on nonlinear damping and equivalent damping and optimized with an optimization method based on nonlinear damping and intelligent algorithms to improve the vehicle ride comfort. Most of the studies improve vehicle ride comfort only by matching spring stiffness of suspension and damping coefficient of shock absorber. E paper is organized as follows: Section 2 develops a vehicle vibration model and discusses the ride comfort characteristics of the vehicle.
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