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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。
A mathematical expression model of stiffness-damping coefficient was established by combining theory and experiment. The influence of the variation of excitation frequency and compression on the dynamic stiffness and damping of cushion pillars was revealed. The least square fitting method was used to determine the function Contains the unknown parameters, reconstructs the relationship between dynamic parameters and compression and excitation frequency, and compares the fitted curve with the experimental curve. The results show that the dynamic parameters of the landing gear cushion pillars exhibit a complicated curved relationship with the frequency and the amount of compression, and the establishment of dynamic parameter expressions can provide some theoretical support for the dynamic analysis and optimization design of the landing gear cushion pillars.