飞机起落架收放系统建模与故障仿真

针对某型支线客机的起落架收放系统,分析了其主要故障类型和故障原因。应用AMESim仿真平台建立了起落架收放系统模型,对该系统的正常收放过程进行了仿真,得到作动筒行程和液压泵出口压力、流量变化情况,并进行了结果分析,仿真结果满足起落架收放系统的基本性能指标。研究了液压泵泄漏、作动筒泄漏、油滤堵塞、节流阀堵塞等对系统工作特性影响较大的故障模式。仿真并分析了不同部件性能参数变化对系统工作性能的影响,为起落架收放系统故障诊断和健康状态监测在工程中的应用提供了有益的参考。

Modeling and fault simulation of the landing gear extension and retraction system

We analyze the main fault types and their causes of the landing gear retraction/extension system of a typical regional aircraft, establish a model of this system on the AMESim simulation platform and simulate the normal retraction extension process. The variation processes of the displacement of an actuator movement, the pressure and flow rate of the pump output are provided, and the simulation results are analyzed. The simulation results show that the system can meet the basic performance indexes of the landing gear system. The fault modes of the hydraulic pump leakage, the internal leakage of the actuator, the clogging of oil filter and throttle etc. are studied, which have significant effect on system performance. The impact of varying performance parameters of different components on system performance is simulated and analyzed. These investigations are beneficial and valuable for solving fault diagnosis and health monitoring problems of the landing gear retraction/extension system in engineering practice.