某型机尾起缓冲支柱动态特性研究分析

Study on the Dynamic Characteristics of Some Kind of Aircraft Tail Undercarriage Damper Strut

利用理论与试验相结合的方法建立了一种刚度-阻尼系数的数学表达式模型,着重揭示了激励频率和压缩量的变化对缓冲支柱动态刚度和阻尼的影响,运用最小二乘拟合法确定函数中包含的未知参数,重构了动态参数与压缩量和激励频率的关系曲线,并将拟合曲线与试验曲线进行比较。研究结果表明:起落架缓冲支柱的动态参数与频率和压缩量呈现复杂的曲面关系,动态参数表达式的建立可为起落架缓冲支柱的动态分析和优化设计提供一定的理论支持。

This article built a dynamic stiffness and damper factor model combining theory with test,and stressed the influence on the dynamic parameter of buffering support by the changing of excitation frequency and reduction. Least square method has been used to determine the unknown parameters included in dynamic stiffness,dynamic parameters to compression and exciting frequency curve has been reconstituted. Comparing with test result curve,the results showed that a complicated curve displayed between the dynamic stiffness and frequency of landing gear buffering support and the reduction. Besides that,dynamic function of parameters model could provide certain theory support for dynamic analysis and design optimization of landing gear buffering support.