Vehicle simulation and subjective and objective evaluation based on the nonlinear air spring model

doi:10.3969/j.issn.1674-8484.2024.01.002

Abstract

Abstract:

As the application of the nonlinear air spring model, this paper conducted the dynamic simulation and subjective evaluation of the air suspension vehicle. Combined with frequency and amplitude dependency of the dynamic stiffness model of the air spring and Simulink simulation, a 7 degree-of-freedom model for vehicle with air suspension system was proposed. The root mean square value and power spectral density of suspension dynamic travel and sprung acceleration under different road conditions were compared. The dynamic characteristics of the air suspension vehicle under different speeds, road surfaces and shock absorber damping conditions were analyzed from the perspectives of time and frequency domain. The subjective and objective tests were carried out on the vehicle equipped with different air springs. The results show that the prediction error of suspension dynamic travel is less than 7%, and the prediction error of sprung position acceleration resonance peak value and resonance frequency is less than 6%. Therefore, the results verify the universality and accuracy of the proposed model. The model can reflect the dynamic characteristics of the vehicle with air suspension, and can provide mechanism explanations for subjective and objective ride comfort tests.

Key words: vehicle structure, air spring model, air suspension, dynamic characteristics, ride comfort, subjective and objective evaluation

CLC Number:

TK402

WU Mingyu, GUO Peilin, LI Yaochao, WANG Shiwei, HOU Jie, WEI Yintao. Vehicle simulation and subjective and objective evaluation based on the nonlinear air spring model[J]. Journal of Automotive Safety and Energy, 2024, 15(1): 20-28.

Figures/Tables 10

References 22

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车身高度	1.80 m
车身长度	5.04 m
车身宽度	1.76 m
质心高度	0.73 m
质心距前轴距离	1.44 m
质心距左侧轮距离	0.86 m
轮距	1.69 m
轴距	3.01 m
簧上质量	2.22 t
簧下(单悬架)质量	75 kg
前轴轮胎刚度	314 kN/m
俯仰转动惯量	4.80 t·m^-2
侧倾转动惯量	920 kg·m^-2
后轴轮胎刚度	301 kN/m

车身高度	1.80 m
车身长度	5.04 m
车身宽度	1.76 m
质心高度	0.73 m
质心距前轴距离	1.44 m
质心距左侧轮距离	0.86 m
轮距	1.69 m
轴距	3.01 m
簧上质量	2.22 t
簧下(单悬架)质量	75 kg
前轴轮胎刚度	314 kN/m
俯仰转动惯量	4.80 t·m^-2
侧倾转动惯量	920 kg·m^-2
后轴轮胎刚度	301 kN/m

路面	几何平均值 / cm³
水泥路	64
沥青路	87
不平路	256
卵石路A	512
卵石路B	748
比利时路C1	986
比利时路C2	1 024

路面	几何平均值 / cm³
水泥路	64
沥青路	87
不平路	256
卵石路A	512
卵石路B	748
比利时路C1	986
比利时路C2	1 024

路面	位移均方根值 / mm
	左前		右前		左后		右后
	理论	试验	理论	试验	理论	试验	理论	试验
沥青路	5.09	5.38	5.58	6.15	4.71	5.42	5.19	5.48
水泥路	4.33	4.90	5.10	5.96	5.00	4.62	5.35	4.90
不平路	5.58	6.54	6.44	7.02	5.00	4.62	5.35	4.90
卵石路A	7.02	7.50	8.08	7.89	6.54	6.92	6.54	7.49
卵石路B	8.85	9.04	10.05	9.76	8.46	8.94	9.90	9.65
比利时C1	10.00	10.39	11.54	11.15	9.71	10.29	11.06	10.87
比利时C2	10.48	10.03	11.55	11.34	9.90	10.29	10.67	11.44