典型航空液压管路的流固耦合动力学分析-机械电子工程专业论文.docxVIP

摘 要 飞机在总装试飞前需要对飞机各项性能进行地面模拟测试，机载液压系统的测 试尤为重要，因此，有必要研制一种结构简单，而又能够模拟飞行中机翼振动对 其上液压管路影响效果的试验系统，对机翼液压管路的安全性进行合理试验评估。 鉴于此，本文研究了航空管路流固耦合动力学响应的影响因素，最终对试验平台 上的一段航空管路进行流固耦合动力学分析。 首先，本文研究了流固耦合模态分析方法，并研究讨论了不同流体对航空管路 流固耦合模态的影响和不同压力对航空管路流固耦合模态的影响。 其次，研究了流固耦合瞬态动力学分析方法，并研究讨论了不同壁厚和不同入 口流速对管路单双向流固耦合分析结果的差异，为正确选择流固耦合方式提供依 据。 最后，对振动试验平台上的一段航空管路进行流固耦合模态分析，并研究了该 管路在试验平台振动激励条件下的流固耦合瞬态动力学响应，校核液压管路强度， 预测评估了设计的安全性。 关键词：航空液压管路 流固耦合 模态分析 瞬态分析 Abstract The ground simulation tests should be proceeded on the aircraft performances before the aircraft assembling and flight-test. The test of airborne hydraulic system is particularly important. Therefore, it is necessary to develop a test system which is able to simulate the effect on the hydraulic lines caused by flight wing vibration, to access the safety of the flight wing hydraulic lines reasonably. In this paper, the factors affect on the air pipeline dynamic response are being studied. The effects on the air pipeline mode caused by various fluid and the effects on the air pipeline fluid-structure interaction mode caused by various pressure are being discussed. First of all, this paper studies the fluid-structure interaction modal analysis method, and discuss the effects of different fluid on air pipeline fluid-structure interaction mode and the one of different pressure on line fluid-structure interaction mode. Secondly, the fluid-structure interaction transient dynamics analysis method is studied, the differences on one-way and two-way coupling results for the pipeline by various wall thicknesses and inlet velocities are discussed. The basis for selecting the fluid-structure interaction mode correctly is provided. Finally, a fluid-structure interaction modal analysis for the air pipeline carried out on the vibration test platform is proceeded. Then the transient dynamic response of fluid-structure interaction for the pipeline under the vibration excitation condition on the test platform is studied. The security of design is forecasted and eva