月球着陆器典型故障模式分析

为提高月球着陆器着陆可靠性，需识别潜在的故障模式对稳定性着陆带来的影响。建立了着陆器的动力学模型，给出了着陆器着陆时的七种极限工况，作为故障模式分析的基础；针对动力下降段三种典型故障模式，即主发动机延时关机、储箱残留液体着陆和触月信号延迟发出，建立与延时关机对应的上抛、平抛运动和数学关系，与残留液体着陆等效的单摆模型，施加触月信号延迟发出所产生的推力曲线，利用Adams软件进行动力学仿真；结果表明储箱残留液体着陆影响较小，另外两种故障模式使着陆时抗倾倒性能和缓冲性能恶化，增加着陆不稳定性。

Analysis of Typical Failure Modes for Lunar Lander

In order to improve the landing reliability of lunar lander，it’s need to identify influence caused by potential failure modes. The dynamics model of the lander is established, and seven kinds of extreme working conditions during the landing phase are given out as a basis of the failure mode analysis, aiming at three typical failure modes at powered descending phase, i.e. delay shutdown of the main engine, landing with remaining liquid in the liquid storage and delayed signal of the touch switch, up projectile motion, flat projectile motion and their mathematical models corresponding to delay shutdown, a single pendulum model related to landing with remaining liquid, and thrust force curve generated by delayed signal of the touch switch applied to the lander are built. And Adams software is used to make dynamics simulation. The results show that landing with remaining liquid has little influence on landing stability, while other two failure modes make landing increase instability, and anti dumping performance and cushioning performance worsened.