机电作动系统非指令振荡信号的故障影响分析

多电/全电飞机的发展使得机电作动系统（EMA）逐渐应用于飞机舵面的作动，其故障模式和故障影响问题是适航审查的重点。为解决机电作动系统中非指令振荡信号导致的故障模式及故障影响不明确的问题，分析了振荡信号的产生机理、产生位置及表现形式，对变频率、变幅值的振荡信号在机电作动系统中的故障传播和影响展开研究。结果表明：系统架构会改变振荡信号波形，传感器输出振荡信号对系统的故障影响最大，系统舵偏角输出与振荡信号同频率变化，且频率在0.2~3 Hz、8~10 Hz的振荡信号会引发电磁转矩与舵偏角不可接受的振荡，振荡信号幅值影响系统跟踪指令的速度。

Failure effect analysis of uncommand oscillation signals in electromechanical actuation system

Moving towards the development of more electric aircraft, advanced electromechanical actuation system (EMA) is developed for aircraft control surface as one of new technologies. The failure mode and failure effect of EMA are the focus of airworthiness review. In order to solve the problem of uncertain failure mode and failure effect caused by uncommand oscillation signal in EMA, this paper analyzes the generation mechanism, the generation position and the expression form of the oscillation signal. At the same time, the fault propagation and influence of oscillation signal with variable frequency and amplitude in EMA were researched. The results show that the system architecture will change the waveform of the oscillation signal, and the oscillation signal of the sensor makes the greatest fault influence on the system; the control surface deflection angle output of the system has the same frequency as the oscillation signal, and the oscillation signal with frequency between 0.2-3 Hz and 8-10 Hz will cause unacceptable oscillation of the electromagnetic torque and the deflection angle of surface. Finally, the amplitude of the oscillation signal affects the response speed of the system.