针对振动敏感型通信器件的低频减振问题,研究一种多孔流体阻尼式动力吸振器.通过建立吸振器动力学模型,确定动力吸振器刚度和阻尼的最优参数,分析阻尼孔参数对沿程阻尼力和局部阻尼力的影响规律,给出吸振器阻尼的设计方法.在介质分别为水和硅油的情况下,对动力吸振器减振性能进行实验验证,结果显示动力吸振器的吸振频率在1.6 Hz~2 Hz之间,随流体粘度增加,减振效果降低.主振质量吸振后的振动传递率最大可衰减53 %左右,表明多孔流体阻尼动力吸振器对于低频振动有较好的抑制效果.%The low-frequency vibration reduction problem of vibration-sensitive communication components is studied.A type of dynamic vibration absorbers with porous fluid damping is proposed.The dynamical model of the vibration absorber is established, and the stiffness parameters and optimal damping parameters are determined. The influence of damping hole parameters on frictional damping and local damping forces are analyzed, and the design method for the damping of the absorbers is given. Experiments are also conducted to verify the vibration reduction performance of the absorbers. The acceleration transmissibility of the vibration absorber is tested in different media of water and silicone oil respectively.The test results demonstrate that the working frequency of dynamic vibration absorber is in the range of 1.6 Hz-2 Hz.With the increase of fluid viscosity,the vibration absorption effect is reduced.The acceleration transmissibility can be attenuated by about 53 % in the water medium. It shows that the porous fluid damping dynamic vibration absorber has a good inhibitory effect for low-frequency vibration.
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