位移和速度三次非线性因素对金属橡胶干摩擦系统幅频特性的影响

金属橡胶是一种新型材料。文中运用谐波平衡法对金属橡胶千摩擦系统的振动响应进行研究，发现当同时考虑位移三次非线性因素和速度三次非线性因素时，速度三次非线性因素对金属橡胶幅频特性的影响可忽略，而当仅考虑位移三次非线性因素时，随着位移三次非线性因素的增大，幅频特性曲线的振幅逐渐减小，且当位移三次非线性因素较大时，幅频曲线出现弯曲跳跃现象，对金属橡胶减振器作动态响应实验，发现减振器的固有频率和传递率幅值都表现出非线性特性。本文工作对金属橡胶材料的理论建模及其特性的了解有重要的参考价值。

EFFECT OF THE CUBIC NONLINEAR FACTORS FOR DISPLACEMENT AND VELOCITY ON AMPLITUDE FREQUENCY CHARACTERISTICS OF DRY FRICTION SYSTEM FOR METAL RUBBER

Metal rubber is a new material. The vibration response of dry friction system was investigated under harmonic excitation by harmonic balancing technique. There were some conclusions given. When the cubic nonlinear factors of displacement and velocity were simultaneonsly considered, the effect of the cubic nonlinear factor of velocity on amplitude-frequency characteristics of metal rubber could be neglected. However when the cubic nonlinear factor of displacement was alone considered, the amplitudes of amplitude-frequency curves were reduced along with increasing the cubic nonlinear factor of displacement. If the cubic nonlinear factor of displacement was higher, amplitude-frequency curves had phenomenon of bend and leap. The experiment on the dynamic response of tile damper for metal rubber was studied. It was shown that natural frequency and transmissibility amplitude for the damper had nonlinear characteristics. The achievements of the paper will have important reference value for building up model and comprehending characteristics for metal rubber.