脉动流激励下液压管道振动特性分析

Analysis on Vibration Characteristics of Hydraulic Pipe by the Incentives of Pulsating Flow

管道是液压系统中不可缺少的元件,其结构的合理性直接影响液压系统减振降噪的实现。该研究结合在工程实际中常见的脉动流工况,建立液压管道的流固耦合振动模型,模型充分考虑了非恒定摩阻的影响,并探讨了流体脉动频率以及壁厚等因素对液压管道振动响应的影响。研究的结果表明:与传统摩阻经验模型相比,采用与流体频率相关的非恒定摩阻衡量管道摩擦损失时,液压管道的振动幅值较小。

A pipe is an indispensable element in the hydraulic system, and the rationality of its structure has a great effect on reducing vibration and noise of hydraulic system. With the common phenomenon of pulsating flow in engineering practice, a fluid-structure coupling mathematical model of hydraulic pipe by the incentives of pulsating flow is set up. And the established model fully considers the effect of unsteady friction. And the influence of the pulse frequency and the wall thickness on pipe vibration response is analyzed. The results prove that the pipe vibra- tion amplitude is smaller when using the unsteady friction model to measure the pipe friction loss, compared with the traditional friction model.