基于非线性静力学模型的飞机系留载荷计算方法研究

由于飞机在强风下系留时，机体承受各方向的载荷较大，因此需对系留结构及系留索是否具有足够的承载能力进行分析，而其中系留载荷的计算就显得异常重要。采用MSC．Nastran软件，针对飞机存系留情况下，系留索的单向承载性及起落架与地面的非线性接触特性，通过应用非线性间隙单元，建立了非线性静力仿真模型，并计算了飞机在系留状况下，各系留索承受的张力及各系留点所受的载荷，计算中同时考虑了起落架缓冲支柱空气弹簧力对于系留载荷的影响，从而为飞机系留载荷提供了一种新的有限元计算方法。

Research of the Method for Tie-Down Loads Calculation Based on Nonlinearstatical Model

When the airplane is tied-down at high wind velocity, it wilt be subjected to the large loads. So the carrying capacity of mooring structures and mooring cables should be analyzed, and the calculation of fie-down loads becomes very important. The software of MSC. Nastran is used to establish the nonlinear static model by the application of nonlinear gap elements, in which the one-way bearing characteristics of mooring cables, the nonlinear contact characteristics of landing gear with the ground and the influence of the shock absorber loads on tie-down loads are took into account. Then the tension of mooring cables and the loads at mooring points are calculated. The finite element analysis provides a new method for calculation of the tie-down loads.