航空双联液压管路系统流固耦合振动特性研究

Study on fluid-solid coupling vibration characteristics of aviation parallel hydraulic pipeline system

中文关键词: 航空液压管路  流体压力脉动  流固耦合振动  双联管路

英文关键词: aviation hydraulic pipeline  pressure fluctuation  fluid-structure interaction vibration  parallel pipeline

中文摘要:

      针对航空液压管路在油液压力脉动下会产生流固耦合振动，并可能因振动响应过大引发故障的问题，文章建立了双联航空液压管路系统数值模型，基于CFD-FEM流固耦合方法研究了流体压力脉动下的结构振动响应特性，进一步探究了不同压力、频率的流体激励对振动响应的影响。结果表明：流体压力脉动下，管路位移峰值响应集中于结构低阶固有频率，位移大小受到流体激励、结构模态的共同影响，应力响应集中于流体激励频率，应力大小正相关于压力脉动强度。随流体压力升高，管路位移、应力响应均明显增加，流体激励引发共振时管路位移响应成倍放大并保持高幅值下的稳定振动。并联管路振动可通过双联卡箍实现传递并相互影响，最终呈现一致的位移响应频谱特性。

英文摘要:

      In response to the issue of fluid-structure interaction (FSI) vibration induced by fluid pressure pulsation in aviation hydraulic pipelines, which may lead to vibration faults due to excessive vibration response, this paper established a numerical model of a typical parallel hydraulic pipeline system. Utilizing the CFD-FEM method for fluid-structure coupling, the study investigated the structural vibration response characteristics under fluid pressure pulsation. Furthermore, the influence of fluid excitation at dif-ferent pressure and frequency on the vibration response was explored. The findings indicate that under the condition of fluid pressure pulsation, the peak displacement response of the pipeline is concentrated at the lower-order natural frequency. The magnitude of displacement is jointly influenced by the fluid excitation and structural modes. The stress response is focused on the frequency of fluid excitation, with the stress magnitude being positively correlated to the intensity of the pressure pulsation. As the fluid pressure increases, both the pipeline displacement and stress response are significantly increased. When fluid exci-tation triggers resonance, the pipeline displacement response is amplified multifold and maintains a high amplitude of stable vibration. The vibration of the parallel pipelines is transmitted and interrelated through the dual-clamp, ultimately showing con-sistent displacement response spectrum characteristics.