液压式动力反共振隔振器带宽分析

Analysis on the bandwidth of hydraulic anti-resonant vibration isolators

液压式动力反共振隔振器由大、小波纹管、惯性质量和并联弹簧构成,在特定频率的激励下,流体运动产生的惯性力和弹簧的弹性力相平衡从而实现反共振隔振,特别适用于对线谱振动的隔离。建立了两种液压式动力反共振隔振器模型,讨论了隔振带宽与惯性元件质量、放大比等参数的关系;给出了一种双层隔振器设计思路,基于最优化设计方法实现宽频带动力反共振隔振。

The hydraulic anti-resonant vibration isolator mounted in the helicopter isolation system can effectively attenuate the excitation force induced by the helicopter rotor.It possesses the advantages of easy installation,low damping over the lever-type anti-resonant vibration isolators which are facing the problems of high noise and serious wear.It is composed of two metal bellows and a supplementary spring and possesses an anti-resonance frequency,at which the pressure vibration in the fluid induced by the inertial force is in opposite phase to the spring force of the isolator,specially suiting for the isolation of line-spectrum vibrations.In the paper,two types of hydraulic anti-resonant vibration isolator models were built and isolation bandwidths were developed which are related to the inertia mass and magnification ratio.Furthermore,a train of thought about a2-dof hydraulic anti-resonant vibration isolator was put forward to obtain larger bandwidths.