橡胶热氧老化条件下不同预载的压缩机隔振脚垫动态特性研究

RESEARCH ON DYNAMIC CHARACTERISTICS OF RUBBER ISOLATION PAD FOR COMPRESSOR UNDER DIFFERENT PRELOADS AND THERMAL OXYGEN AGING CONDITIONS

揭示热氧老化条件下不同预载的隔振脚垫动态特性机理是空调器压缩机隔振系统匹配的关键所在。该文引入Peck模型表征热氧老化因子,并运用包含热氧老化因子的分数导数Kelvin-Voigt摄动模型和Coulomb摩擦摄动模型分别描述其频率依赖性和振幅依赖性,建立了考虑变预载影响的隔振脚垫热氧老化-动态特性模型。进一步辨识了不同预载条件下的模型参数,通过试验数据验证了模型的正确性,创新提出了刚度转变点和刚度转变频率的概念以更好地描述服役后变预载、变振幅工况下橡胶隔振脚垫的软化效应。为深入研究空调压缩机与隔振脚垫的刚度匹配与橡胶配方的优化设计奠定理论基础。

Revealing the dynamic characteristic mechanism of the rubber isolation pad(RIP)with different preloads and thermal oxygen aging conditions is the key to match the vibration isolation system of the air conditioner compressor.The Peck model is first introduced to characterize the thermal oxygen aging factor,and the fractional derivative Kelvin-Voigt perturbation model and the Coulomb friction perturbation model including the thermal oxygen aging factor are established to describe the frequency dependence and the amplitude dependence,respectively.The model for the thermal oxygen aging-dynamic characteristic of the RIP is built by considering the influence of variable preloads.The model parameters under different preloads are further identified,and the correctness of the model is verified by the experimental data.The concepts of stiffness transition points and stiffness transition frequencies are innovatively proposed to better describe the softening effect of the RIP under variable preload and amplitude conditions after service.These can lay a theoretical foundation for the in-depth study on the stiffness matching of an air conditioner compressor with the RIP and on the optimization design of rubber formula.