关键词: 机电作动系统, 故障模式, 故障注入, 故障影响, 适航验证

Abstract: The application of electromechanical actuation in the flight control system has become the main feature of multi-electric/all-electric aircraft.The fault modes of the flight control electromechanical actuation system are complex and the influence of the fault is uncertain,which is the focus of conformity verification and airworthiness examination.In order to solve the problem that the level of fault injection test is uncertain for different fault modes, the fault mechanism and modeling method of typical fault modes in electromechanical actuation system were studied, fault injection and effect simulation analysis considering the influence of non-linearity and different system designs were carried out.The results show that the effects of bearing jam and load path structure fault on the system are only related to this type of fault, fault injection is from the system level.However,the effects of winding short circuit and excessive gap of mechanical transmission on the system are uncertain and related to the non-linear and specific system design.Therefore,fault injection within the system is required.