Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2227-2235.doi: 10.13229/j.cnki.jdxbgxb.20211166

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Impact dynamic modeling and simulation for ball joint with clearance considering nonlinear stiffness

Shu-pei ZHANG(),Ming-yue XIA,Wei ZHANG,Zhao CHEN,Yi-xiang CHEN   

  1. School of Automotive and Traffic Engineering，Jiangsu University，Zhenjiang 212013，China
  • Received:2021-11-08 Online:2023-08-01 Published:2023-08-21

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Abstract:

In order to improve the accuracy of analysis of ball joint with clearance， the coupling characteristics between the non-linear contact stiffness of the contact bodies and the mechanism in the impact were considered， and the contact-impact characteristics of the ball joint was studied under the conditions of different restitution coefficients and initial impact speed. The results show that the contact stiffness and hysteresis damping coefficient avoid the situation that remains constant during the real contact process； the improved model describes the impact characteristics of the spherical joint more currently； the peak contact force and deformation is greater with increase of coefficient of restitution， the longer time it takes to reach the peak and shorter time to complete an impact； the contact-impact force and deformation increase rapidly with the increase of initial velocity， and the time to complete the impact decreases. The accuracy of obtaining the impact characteristics of the spherical joint provides a mechanical basis for the precise control of vehicle handling stability.

Key words: vehicle engineering, clearance, spherical joint, contact-impact, finite element

CLC Number: 

  • U463.46

Fig.1

Geometric constraint model of spherical joint"

Fig.2

Impact process of ball pin and ball socket"

Fig.3

Relationship between spherical joint contact deformation coefficient and clearance"

Fig.4

Variation law of contact deformation coefficient with the change of clearance and deformation"

Fig.5

Fitting results of contact deformation coefficient"

Table 1

Simulation parameters"

参数数值参数数值
球销半径/mm14球铰间隙/mm0.1
球窝内表面半径14.1初始速度/（mm·s-1）1 000
球销弹性模量/GPa206球窝弹性模量/GPa2.6
球销泊松比0.3泊松比0.2
球销密度/（g·cm-3）7.82球销密度/（g·cm-3）0.139

Fig.6

Points selection of spherical joint"

Fig.7

Displacement and time curve of the contact point of contact surface between the ball pin and the ball socket"

Fig.8

Relationship curve of contact force and time"

Fig.9

Relationship curve of contact force and deformation"

Fig.10

Relationship curve of contact force，deformation and time during an impact"

Fig.11

Influence of different restitution coefficients on impact characteristics"

Fig.12

Influence of different initial velocities on impact characteristics"

Fig.13

Simulation results of three models with different clearance"

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