航空复杂液压管路系统流致振动机理研究

The aero hydraulic pipeline system, spanning from the pump, valve, and oil filter to actuator for the delivery of fluid power, is one of the most important part for electromechanical system to guarantee the flight safety. The vibration faults of pipeline system often occur in the practice engineering field duo to flow induced vibration, causing serious loss of life and property. .Since the coupled vibration mechanism for complex pipeline system under multi-excitation is not clear, the numerical method for studying the unsteady flow characteristic is proposed in this project, which considering unsteady flow caused by the spatial arrangement of pipeline, the complex structure and constraints, the pump, valve and actuator. The dynamic model of complex pipeline including the coupling factors of pump and valve are established. Moreover, the solving approach for complex model of pipeline under multi-excitations are proposed which can reduce the computational cost significantly with sufficient accuracy. Then the mechanism of flow induced vibration and the transfer law of vibration energy are obtained. Finally, the coupling vibration mechanism of pipeline will be studied under complex multi-excitations and structure parameters, then the vibration of complex pipeline system and its key structure will be accurately simulated..This project can provide a valuable support for the dynamic design of aero hydraulic pipeline system. Some achievements will be obtained on modeling method of complex pipeline system, the mechanism of flow induced vibration and the transfer law of vibration energy under multi-excitation.

航空液压管路系统连接高压力柱塞泵、阀、油滤和作动器等，是保障飞机飞行安全的重要机电系统之一，在工程实际中由于流致振动导致的失效经常发生，造成严重损失。.本项目针对复杂管路系统在多源载荷激励下耦合振动机理不明确等难题，考虑航空液压管路系统空间分布、结构形式复杂和约束复杂导致的非定常流动以及泵、阀、作动器等产生的非定常流动等因素，提出复杂管路系统非定常流体特性分析方法，建立复杂考虑复杂管路空间分布和泵、阀等元件耦合效应的整体系统动力学模型与分析方法，突破多源载荷联合作用下管路系统耦合振动高效高精度分析技术，揭示非定常流体下管路结构振动产生机理和振动能量的传递规律，实现复杂管路系统整体及关键部件振动的精准模拟。.本项目研究可为航空复杂液压管路系统动态设计提供支持。预期在复杂管路系统的建模方法、流致振动机理和多源载荷下振动能量的传递规律等方面取得突破性进展。

航空液压管路系统是保障飞机安全飞行的重要机电系统之一，在工程实际中由于流致振动导致的故障经常发生，造成了严重损失。本项目面向航空液压管路系统结构形式复杂、约束复杂、非定常流动以及多源载荷条件下耦合振动机理分析中存在的难题，提出了复杂液压管路系统及关键部件的动力学建模方法，揭示了非定常流体作用下管路结构振动产生机理，探明了多源载荷作用下管路系统振动响应机制，实现了复杂管路系统整体及关键部件振动的高效振动预估。.本项目提出了复杂管路系统及关键部件的多层次建模方法，实现了关键结构零件级、部件级到系统级的多层次快速建模。提出了特征线与有限元相结合的方法分析泵源非定常流动下管路系统振动响应，给出了泵源流体脉动的快速提取与表征方法，理论和试验分析表明，管路系统在泵源激励下产生多个谐波阶次的振动响应。发现了管路系统在泵源激励和基础激励下产生的复杂共振和拍振行为，揭示了管路高频振动对低频振动诱发机理，即流体压力脉动谐波频率与机体基础激励频率接近时引发的拍振现象。本项目对提高我国机载液压管路系统设计水平具有重要指导意义。.本项目完成了项目任务计划书的内容，达到了预期目标，在国内外重要期刊上发表了论文11篇（均标注本基金项目资助），其中SCI论文8篇，EI论文3篇，部分成果发表在航空航天专业期刊《Chinese Journal of Aeronautics》、《航空学报》、《航空动力学报》。申请了国家发明专利2项（已受理），授权了实用新型专利1项、软件著作权登记1项，培养了硕士研究生6人。

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