Failure effect analysis of uncommand oscillation signals in electromechanical actuation system
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摘要:
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。
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关键词:
- 机电作动系统(EMA) /
- 非指令振荡 /
- 故障模式 /
- 故障影响 /
- 功率电传
Abstract: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.
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图 8 控制器输出端注入振荡信号
Figure 8. Controller output terminal injected with oscillation signal
图 10 驱动器输入端注入振荡信号
Figure 10. Motor driver input terminal injected with oscillation signal
图 11 不同位置注入振荡信号后的电机转速
Figure 11. Motor speed after injecting oscillation signal in different positions
图 12 不同位置注入振荡信号后的输出转矩
Figure 12. Output torque after injecting oscillation signal in different positions
图 13 不同位置注入振荡信号后的舵偏角输出
Figure 13. Surface deflection angle output after injecting oscillation signal in different positions
图 14 控制器输出变幅值振荡信号
Figure 14. Oscillation signal of varied amplitude injected in controller output
图 15 传感器输出变幅值振荡信号
Figure 15. Oscillation signal of varied amplitude injected in sensor output
图 16 控制器与传感器振荡信号故障影响比较
Figure 16. Comparison of oscillation signal failure effect between controller and sensor
图 17 控制器输出变频率振荡信号
Figure 17. Oscillation signal of varied frequency injected in controller output
图 18 传感器输出变频率振荡信号
Figure 18. Oscillation signal of varied frequency injected in sensor output
图 20 不同振荡信号频率对输出舵偏角的影响
Figure 20. Influence of different oscillation signal frequencies on output control surface deflection angle
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