Mechanical And Electrical Integrated Technology Research And Simulation Platform Design Of Modern Airliner

In this paper, we select two electrical subsystems——landing gear subsystem and Anti-skid braking subsystem the Boeing 757 as the research objects. In the whole system, we design the actuators of the two subsystems, use remote interface unit(RIU) to collect signals generated from the actuators, and transmit the collected datas to utility management computer(UMC) through CAN bus. In the UMC, while using the software fault-tolerant algorithms, we combine static priority and time slice scheduling algorithm together to achieve integrated management of the system and fault tolerance. In addition, in order to improve the system reliability, the system uses a double-double redundance, that is two CAN bus, and introduces hot redundancy of CAN bus; In the UMC, we design the condition monitoring programmes of the subsystems, in which two typical fault diagnosis——Fault Tree Analysis and Particle Filter are used to predict and diagnose the failure of the system. Once the fault occurs, it triggers the alarm function timely. When using Fault Tree Analysis, we establish the fault tree of the landing gear system and predict that which components are easier to be fault sources; we also establish the math model of the brake pressure, compare the faults appeared with unappeared and give the fault diagnosis simulation in the particle filter.The airborne electromachanical system's comprehensive management platform is enforced with the software of LabVIEW, combined with the functions of data acquisition, data transmission, data display, fault detection and isolation. Also, it can achieve semi-physical simulation and digital simulation, providing technical for the research of China-Made Big Aircraft.