Research For Ride Comfort Of Passenger Vehicle Based On Finite Element Method

Use of passenger vehicles not only brought great convenience to people’s travel, but also greatly alleviated the urban traffic pressure. On the premise of meeting passenger safety, people put forward higher requirements to the passenger vehicle’s ride comfort. Passenger vehicle’s ride comfort of the stand or fall not only affects passengers’ comfortableness and health, but also affects the dynamic performance and steering stability, what is worse, the poor passenger vehicle’s ride comfort may cause damage to parts and shorten service life.Factors that affect passenger vehicle’s ride comfort have engine unbalance, wheel unbalance and road surface irregularity. Based on the above three factors, passenger vehicle finite element model was established by the finite element software ANSYS. Ride comfort analysis and evaluation of passenger vehicle were based on the finite element technology. The following works were mainly studied in this paper.(1) Free modal analysis for the finite element model of the passenger vehicle frame was made in order to examine the rigidity of body frame level and natural characteristics. Constraint modal analysis for the finite element model of the whole passenger vehicle was made in order to get the natural characteristics of passenger vehicle under actual condition, namely inherent frequency and mode of vibration. Finally dynamic performance of passenger vehicle was evaluated in the light of constraint modal analysis results.(2) Passenger vehicle by engine and wheel unbalance excitation were simulated analysis by harmonic response analysis, vertical and horizontal two kinds of working condition were analyzed for the engine unbalance. By the harmonic response analysis results, wheel unbalance excitation had little impact on passenger vehicle’s ride comfort and may not be considered, engine unbalance excitation had large impact on passenger vehicle’s ride comfort when the engine was idling,some improvement measures to improve the smooth performance of passenger vehicle were put forward.(3) The passenger vehicle vibration by road surface irregularity was carried out using the spectrum analysis method. The passenger vehicle of spectrum analysis was made when passenger vehicle was driving in grade B road and C road. According to the response of acceleration power spectral density curve, passenger vehicle’s root mean square values of weighted acceleration were0.46m/s2in grade B road and0.78m/s2in grade C road. The seat above the left side of the nearest to the rear axle was selected as test point. Passenger vehicle meet passenger vehicle’s ride comfort evaluation threshold by passenger vehicle ride comfort evaluation.