Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 389-398.doi: 10.13229/j.cnki.jdxbgxb20190172

   

Influence of anisotropic stiffness on tire mechanical properties and vehicle handling characteristics under combined slip situations

Xiao-yu LI1(),Nan XU1(),Tao QIU2,Kong-hui GUO1   

  1. 1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
    2.KH Automotive Technologies Co. Ltd. , Changchun 130012, China
  • Received:2019-02-22 Online:2020-03-01 Published:2020-03-08
  • Contact: Nan XU E-mail:lixiaoyuhy@foxmail.com;xunan@jlu.edu.cn

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Abstract:

In order to reveal the influence of anisotropic stiffness on tire mechanical properties and vehicle handling characteristics under combined slip situations. Firstly, the direction factor is introduced to describe the direction of resultant shear force in the contact patch, which improves the modeling accuracy of UniTire for combined slip tire forces; Secondly, the influence of anisotropy degree on tire mechanical properties is analyzed based on test data, and the expression of effective cornering stiffness considering the influence of tire anisotropy is constructed; Then a vehicle handling analysis model considering the influence of tire anisotropy is established, and the influence of longitudinal acceleration on vehicle handling characteristics is analyzed with different anisotropy values; Finally, the analysis results are simulated and validated with CarSim. The results show that with the strong anisotropy value, different braking/driving torque distribution modes have little effect on vehicle handling characteristics under combined slip situations. However, with the weak anisotropy value, the vehicle handling characteristics under combined slip situations are significantly affected by different braking/driving torque distribution modes.

Key words: vehicle engineering, UniTire tire model, anisotropic stiffness, combined slip situations, vehicle handling characteristics

CLC Number: 

  • U461.1

Fig.1

Tire axis system"

Fig.2

Normalized tire forces"

Fig.3

MTS Flat Trac plus steel belt high speed tire test bench"

Fig.4

Resultant forces at α=1° "

Fig.5

Direction of resultant force with direction factor λ"

Fig.6

Comparisons of lateral forces according to different direction"

Fig.7

Lateral force vs brake force according to different direction."

Fig.8

Contrast of UniTire model and test data under combined slip situations at 7 440 N load"

Fig.9

Direction of resultant force with different anisotropic degree"

Fig.10

Effective cornering stiffness with different anisotropic degree"

Fig.11

Effective cornering stiffness K ye expressed by Eq.(19) "

Fig.12

Schematic of single-track vehicle model"

Table 1

Parameters for tire contrast and analysis"

参数强各向异性刚度弱各向异性刚度
胎压/kPa150350
K y/K x0.2480.540
ρ10.0200.480
ηc[0.15,0.55,0.90]
a x/ g-0.4~0.4

Table 2

Vehicle parameters specification"

参数值
簧载质量 Ms/kg 1 800
前轴距质心距离 lf/m 1.016
后轴距质心距离 lr/m 1.524
轮距 d/m 1.5
质心高度 h/m 0.75
前轴/后轴非簧载质量（ muf/mur）/kg 80
前轴侧倾中心高度 hrcf/m 0.65
后轴侧倾中心高度 hrcr/m 0.6

Fig.13

Effect of longitudinal acceleration on steering radius during quasi-steady steering"

Fig.14

Diagram of CarSim and Simulink joint simulation"

Fig.15

Simulation of braking and steering combined slip situation"

Fig.16

Simulation of driving and steering combined slip situation"

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