柔性隔振系统功率流传递特性研究

由于基础和隔振器存在着动力耦合,经典隔振理论的局限性日益突出,从而出现了将基础简化为欧拉梁、柔性板、圆柱壳等。本文将基础简化为两端固支弹性梁,运用四端参数法推导了单层柔性隔振系统传递功率流,并运用电力类比法对推导结果进行了验证。通过数值仿真,分析了偏心激励对功率流传递特性的影响,并将功率流与振级落差频谱曲线进行了比较。结果表明：偏心激励会激发系统的高阶模态,基础的刚性会影响振级落差对功率流的估计。

Researches on Flexible Isolation System Power Flow Transmission Characteristics

Since the dynamic coupling exists between the foundation and isolators, limitations of classical vibration theory is becoming more prominent, so the foundation simplified as Euler beam, the flexible plate and cylindrical shell comes into being. This article simplifys the foundation as elastic beam clamped at both ends, By using the method of four end parameter, the transmission power flow of single layer vibration isolation system is derived. To verify the result, the method of electric analogy analysis is adopted. A numerical simulation of the power flow is carried out to analyze the influence of the eccentric excitation on the transmission characteristics of the power flow. The results show that the eccentric excitation can arouse high order modals of the system, and the foundation rigidity can affect the estimation of power flow by the vibration level drop.