基于橡胶热氧老化规律的压缩机隔振脚垫动态特性研究

以某空调器压缩机橡胶隔振脚垫为研究对象,考虑热氧老化对橡胶隔振脚垫的动态特性影响,采用Arrhenius模型、分数导数Kelvin-Voigt模型和库仑摩擦模型对橡胶隔振脚垫进行动态特性建模,建立了橡胶隔振脚垫热氧老化-动态特性数学模型。基于MTS831弹性体试验台搭建了隔振脚垫静、动态特性测试装置,给出了模型参数的辨识方法,试验验证了热氧老化-动态特性数学模型的正确性。结果表明,在100℃热氧老化7天后,橡胶隔振脚垫静刚度增长19.35%,动刚度最大增长5.3%,损耗因子最大减小11.6%。热氧老化-动态特性模型能够有效地表征橡胶隔振脚垫动态特性的振幅相关性、频率相关性和热氧老化相关性,为深入研究计及外界环境温度因素导致橡胶热氧老化的隔振脚垫服役后动态特性演化规律提供基础。

Dynamic characteristics of compressor vibration isolation padbased on rubber thermal oxygen aging law

Here,taking rubber vibration isolation pad of a certain air conditioner compressor as the study object,considering effects of thermal oxygen aging on its dynamic characteristics,the pad’s dynamic characteristics were modeled with Arrhenius model,fractional derivative Kelvin Voigt one and Coulomb friction one,and the pad’s thermal oxygen aging-dynamic characteristics mathematical model was established.Based on MTS831 elastomer test platform,the static and dynamic characteristics test device of the pad was built,and the identification method of model parameters was given.The correctness of the mathematical model for the pad’s thermal oxygen aging-dynamic characteristics was verified with tests.The results showed that after 7 days of thermal oxygen aging at 100℃,the pad’s static stiffness increases by 19.35%,the maximum increase in its dynamic stiffness is 5.3%,and the maximum decrease in loss factor is 11.6%;the thermal oxygen aging-dynamic characteristics model can effectively characterize amplitude correlation,frequency correlation and thermal oxygen aging correlation of the pad’s dynamic characteristics,and provide a basis for deeply studying post service dynamic characteristics evolution law of the pad considering external environment and temperature factors.