金属橡胶阻尼三向减振器力学特性与环境效应OA北大核心CSTPCD

Driven by vibration and noise reduction needs of precision weapons under multi-directional periodic loading conditions and multi-field service environments,a novel three-directional vibration isolator combined metal-rubber damper and inclined rectangular spring was developed.The dynamic model and the corresponding experimental test systems were established.The evolution laws of mechanical performances such as natural frequency,dynamic stiffness and damping ratio under various operating conditions were analyzed.The influences of excitation force on the dynamic performances of three-directional vibration isolator were investigated by means of theoretical and experimental methods.The evolutions of dynamic performances and the mechanism of damping energy dissipation under normal temperature,high and low temperatures,slat-fog and hygrothermal environments were performed respectively.The results indicate that the dynamic performances of three-directional vibration isolator such as natural frequency,dynamic stiffness and damping ratio have been attenuated with the increase of excitation force,and the stiffness softening phenomenon has occurred.The corresponding performance evolutions predicted by theoretical model are consistent with the experimental results.Under the working conditions of each service environment,the maximum rate of change in the dynamic mechanical properties of the vibration isolator combined metal-rubber damper and inclined spring can be seen that the vibration isolator have high stability and consistency.