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一、经典隔振理论的局限性在经典(刚性)隔振理论中,假设被隔振设备或机器是一个理想质量,隔离器是一个理想无质量弹簧并联一个理想粘性阻尼器,基础则认为是绝对刚性.这个刚性隔振理论给出,只要激振频率ω比系统的固有频率ω_n大(?)倍,就有隔振效果.激振频率越高,则隔振效果越好.根据这个理论,予期可以提供40～60dB的衰减,但实际上单级隔振很少能提供大于20dB的衰减.而且激振频率越高.实际和予期的差值越大.究其原因是因设备本身不是一个理想的集中质量,它在声频范围内有许多共振频率;隔离器也并不是一个理想弹簧并联一个理想阻尼器在高频条件
First, the classic vibration isolation theory In classical (rigid) vibration isolation theory, the assumption that the vibration isolation device or machine is an ideal mass, the isolator is an ideal massless spring parallel viscous damper, the foundation is that The rigid isolation theory gives the vibration isolation effect as long as the excitation frequency ω is greater than the natural frequency ω_n of the system, and the higher the excitation frequency, the better the vibration isolation effect.According to this theory , The expected can provide 40 ~ 60dB of attenuation, but in fact single-stage isolation is rarely able to provide greater than 20dB attenuation. And the higher the excitation frequency. The actual and the greater the difference between the expected. The reason is because the device itself is not An ideal focused quality, it has many resonant frequencies in the audible range; the isolator is also not an ideal spring in parallel with an ideal damper in high frequency conditions