Dynamic Properties Of Rubber Isolatorsin Power-train System

This thesis comprises three parts. Firstly mechanical property of elastomer is overviewed and then the testing to explore dynamic behavior of rubber isolators is presented. Finally modeling of power-train system and analysis of system frequency response corresponding to different dynamic scenarios are demonstrated.Maxwell model and Kelvin-Voigt model are employed to describe the rubber static viscoelasticity exhibits as stress release and creep. Being represented as hysteresis and energy loss, dynamic viscoelasticity of rubber material is viewed having correlation with conditions such as temperature,frequency and vibration amplitude,etc under which material works.Testing indicates that dynamic stiffness and loss factor of the rubber isolators relies on frequency and vibration amplitude as well. Dynamic stiffness is sensitive to the variation of vibration amplitude. Loss factor generally increases following the increasing of the excitation frequency.Six(6) Degree Of Freedom model is established to simulate the dynamic behavior of the power train system concentrating on understanding the frequency response. The nonlinear system simulated presents particular characteristics in frequency response aspect. The profile of the vibration transmissibility curve relates with the direction of the frequency sweeping and which reflects the typical skipping and hysteresis phenomena possessed by the nonlinear system.