飞机起落架动力学建模及着陆随机响应分析

针对飞机起落架弹性结构特征的动力学建模及其离散结构简化响应分析问题,利用哈密顿变分原理,提出并建立了弹性结构的起落架动力学模型。根据此动力学模型,可自由选择起落架的结构离散数量进行动力学方程的求解和响应分析。以某型飞机着陆过程为研究实例,使用随机模拟方法,通过模拟飞机着陆下沉速度、初始位移和路面不平度,分析了飞机着陆过程起落架的随机响应特征,确定了起落架的实际动力学性能和应力应变特性,为后续起落架的结构参数优化及其疲劳性能分析提供了基础参考依据。

Dynamic modeling of landing gear and its random response analysis

For the elastic structure characteristics of aircraft landing gear, a dynamic model is established. Meanwhile, the problem is analyzed with the discrete structure simplified response. The Hamilton's variation principle is used for putting forward the landing dynamic model containing the elastic structure. According to the dynamic model, the number of discrete structures of landing gear can be free to choose for solving the dynamics equation and analyzing the response. Taking the analysis of aircraft landing process as an example, with the use of random simulation, through the simulation of the aircraft landing sinking speed, initial displacement and runway unevenness, the random response characteristics of the aircraft are analyzed on the landing. The actual dynamic performance and the stress-strain characteristics of landing gear are determined, providing a basic reference for the optimization of structure parameters and fatigue analysis of landing gear.