Zhou Changcheng

Stress analytic computation of variable-thickness slice of shock absorber for special vehicle suspension and its application

To meet the requirements of throttle slice stress intensity and damping characteristics for special vehicle, the shock absorber needs to adopt variable-thickness throttle slice, but there is no accurate stress analytic computation formula for it, thus, the fracture failure of the valve often occurrs. Based on the mechanics model of variable-thickness throttle slice, the general solutions of the differential equation of throttle slice on uniform pressure was given, and the deformation analytic formula was established. With the relations of the deformation, the inner force, and the stress of the throttle slice, the analytic formulae of radial, circumferential and compound stress at any radius were given, and the slice stress coefficients were built. The stress of variable-thickness throttle slice on uniform pressure at any radius was computed, and was testified by ANSYS, the value computed was close to that simulated, and the maximum of the relative deviation was less than 0.8%. With a practical example, by test, the stress analytic computation formula was validated. The test results showed the valve designed met the requirements of stress intensity and stiffness and the stress computation method was reliable, which has important reference value for variable-thickness throttle slice design and intensity analysis.

Radial deformation computation and test of axial symmetry rubber bushing for vehicle suspension

To facilitate the initial design and stiffness matching of rubber bushing, according to the elastic mechanics theory, based on the analysis of the measured curve of radial deformation, by imposing virtual constraint stress on both ends of the bushing, the deformation analytic formula of rubber bushing on a radial concentrated force was established. With a practical example, the radial static deformation formula was computed and verified by simulation using ANSYS and test, and the analytical value is close to the simulated and the tested. The results show that the method of radial deformation analytic computation of rubber bushing under small deformation assumption is reliable and this method has important reference value for suspension design of vehicles.