前起落架锁撑杆结构承载特性研究

Research on Bearing Characteristics of Nose Landing Gear Locking Bar Structure

前起落架主承力结构包括主支柱和撑杆两部分。大型飞机前起落架撑杆采用锁撑杆结构代替上位锁和下位锁,维持起落架收起和放下时的姿态。由于锁撑杆设计目的为维持撑杆形态,锁撑杆载荷与起落架撑杆载荷不耦合,无法采用工程算法或有限元分析准确计算锁撑杆载荷。本文基于前起落架锁撑杆的结构特点,采用试验方法获得试验数据,通过试验数据对比分析对锁撑杆结构的承载特性进行研究,为前起落架结构设计及优化提供支撑。

The main bearing structure of nose landing gear includes two parts:main strut and brace.The nose landing gear brace of large aircraft adopts the locking bar structure instead of upper lock and lower lock to maintain the attitude of nose landing gear when retracted and lowered.Because the design purpose of the locking bar is to maintain the shape of the brace,the load of the locking bar is not coupled with the load of the brace,so the engineering algorithm or finite element analysis can not be used to accurately calculate the load of the locking bar.In this paper,based on the characteristics of the nose landing gear locking bar structure,the test method is used to obtain the test data.Through the comparative analysis of the test data,the bearing characteristics of the locking bar structure are studied,so as to provide support for the design and optimization of the nose landing gear structure.