流体特性对周期管路弯曲振动带隙的影响

Effects of Fluid Property on Flexural Vibration Band Gap of Periodic Pipe

基于声子晶体理论,将液压管路设计成由钢管和挠性软管组成的周期结构,利用其带隙特性实现液压系统的振动控制。分别采用传递矩阵法和有限元法对周期管路的能带结构和振动传递特性进行了计算,同时深入研究了压力和黏度对周期管路带隙特性的影响。结果表明,周期管路在1 000 Hz以下的低频范围内具有良好的减振性能,能够有效的抑制液压管路中弯曲振动的传播;流体压力导致周期管路弯曲振动带隙升高,而流体黏度则其没有任何影响。文中的研究为液压管路的振动控制提供了一条新的技术途径。

According to the theory of phononic crystals （PCs）, the hydraulic pipe was designed to be a periodic structure which is composed of steel pipe and hose. The vibration of hydraulic system was suppressed by using the characteristics of band gaps （BGs） of the periodic pipe. The band structure and FRF of the periodic pipe was calculated by the transfer method and finite element method （FEM）, respectively. And the effects of pressure and viscosity on the flexural BGs of periodic pipe were studied deeply. The results show the periodic pipe has vibration BGs below 1 000 Hz, and it can suppress the vibration of the hydraulic system effectively. Transmission of flexural vibration of hydraulic pipe can be suppressed effectively. The BGs of the periodic pipe is increased with the increasing of the fluid pressure, but the effect of viscosity on the BGs is limited. The study provides an effective new technical way to control the vibration of hydraulic system.