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对典型的减振结构建立等效的质量 刚度集中参数模型 ,推导在基础随机激励下该模型的振动响应谱解析公式 ,并对它们在不同刚度参数下的振动响应变化特点进行了分析。通过分析可知 :在质量和阻尼一定的情况下 ,减振结构的刚度越小 ,对高频的过滤作用越明显 ;无论系统或减振结构刚度如何变化 ,其位移响应谱总均方根值主要都集中在低频段 ,因此对于需严格控制线位移或角位移的系统 ,应重点考虑低频段减振问题
The equivalent mass stiffness concentration parameter model is established for the typical vibration-damping structure. The analytical formula of the vibration response spectrum of the model under the basic random excitation is deduced. The variation characteristics of the vibration response under different stiffness parameters are analyzed. The analysis shows that under certain conditions of mass and damping, the smaller the stiffness of the vibration-damping structure is, the more obvious the filtering effect is to the high-frequency filter. The total rms value of the displacement response spectrum is mainly no matter the stiffness of the system or damping structure changes Are concentrated in the low frequency band, so for the system to strictly control the line displacement or angular displacement, should focus on low-frequency vibration damping issues