典型起落架的通用载荷谱分析及传载计算

General Load Spectrum Analysis and Loads Transfer Calculation of the Typical Undercarriage Structure

为了对典型结构前起落架的一般受载、传载等情况进行研究,首先按照飞机地面操纵的不同阶段,分析起落架相应的多种工况,给出起落架载荷谱的分解模型及计算方法;然后建立通用前起落架的力学模型和载荷传递的数学模型,根据载荷谱上选取的受载严酷的工况点并结合一组具体可行的飞机参数,通过解析方法求解前起落架传力模型的节点载荷;最后通过载荷谱与传载数学模型相结合的方法,求解出起落架主承载点的极限载荷,该极限载荷可作为后期疲劳寿命评估的数据基础。本文的研究方法可为起落架的载荷谱求解、起落架承载性能分析等提供理论依据。

In order to do research on the typical structure of nose landing gear and the general loading actions, firstly, according to the multiple phases during the ground manoeuvre, different loading cases are analyzed, and the relevant breakdown models as well as the calculation method for the landing gear load spectrum are provid- ed. Then, the load model and the mathematic model are built based on the general nose landing gear structure. Critical loading case picked from the load spectrum is studied and real reasonable aircraft structure parameters are introduced in the calculation. Finally, by combining the load spectrum and the mathematic model the main joint loads are obtained. The results indicate that the method is feasible, which could be the support for the later fatigue life estimation. It provides the methods and theoretical support for load spectrum development and the loading analysis of undercarriages.