飞机起落架收放系统动力学分析与试验
Dynamics Analysis and Testing of an Aircraft′s Landing Gear Retraction System

采用虚拟仿真及物理试验相结合的方法对飞机起落架收放系统性能进行研究。基于收放系统工作原理，推导了动力学数学模型，建立了结合起落架动力学和液压系统的多学科协同仿真模型，通过试验结果对虚拟样机模型进行验证。基于虚拟模型和试验平台对液压系统阻尼特性进行了分析,结果表明,联合仿真模型的压力曲线与试验实测数据吻合良好，为起落架收放系统提供了准确的设计方法。仿真及试验表明，阻尼孔径的缩小使压力变化缓慢同时振荡较严重，液压缸作动滞后较为明显。
In order to study landing gear retraction performance, research on an aircraft′s landing gear retraction system was carried out that combines a simulation and laboratory test. The working principle of the system was analyzed, and the dynamic mathematics model were derived in detail. A simulation model was established that combines the landing gear dynamics with the hydraulic system, and a laboratory test was carried out to verify the accuracy of the simulation model. Then, the damping characteristic of the hydraulic system were analyzed based on the simulation model and the test. The results show that the pressure curves of the co-simulation model agree with the test data, which verifies the accuracy of the co-simulation model. Moreover, both the simulation and test show that narrowing the damping hole makes the pressure change slowly and oscillate violently, leading to an obvious lagging stroke.