飞机起落架收放疲劳实验系统设计及应用

On the Design and Application of a Fatigue Testing System for Landing-gear Retraction and Extension

研制了一套用于飞机起落架收放机构、锁机构疲劳寿命实验和可靠性验证的收放疲劳实验系统。提出和实现了精确模拟气动力的凸轮加载方案,并解决了收起、放下过程不对称加载的技术难题。应用PLC技术实现了实验过程的自动化。实验结果表明,该系统工作稳定可靠,可连续数小时工作,载荷模拟最大误差不大于10%,已成功进行7000多次实验循环。实验系统可用于起落架收放疲劳实验,收放动应力测量和锁机构可靠性考核。

A fatigue testing system for landing gear retraction and extension was developed, which can be applied to the fatigue test of retraction mechanisms and locking mechanisms, and its reliability validation was also carried out. Loading scheme that simulates aerodynamic load was brought forward and realized precisely. The problem of loading separation was solved in retraction and extension process of landing gear. Automatic process was realized based on PLC technology. Experimental results indicate that the practical design is reliable and feasible. The maximal error in loading simulation is less than 10%. This system can work several hours continuously. It has been completed experiment more than 7000 times. This system can be applied in fatigue experiment, and the measured dynamic stress and assess of locking mechanisms are reliable.