Design Of Double Redundant Flight Control System Based On Rigid-tie Rod

The aircraft flight control system is one of the most important and core systems for transmitting the pilot’s command to the rudder surface to completing the maneuvering and stability control of the aircraft.The flight control system plays a key role in ensuring the performance of the aircraft and flight safety.In recent years,with the increasing requirements for aircraft safety,many aircraft using a single-duty hard-rod mechanical flight control system cannot meet the system safety requirements.In this paper,the design and research of the dual-redundancy flight control system based on the hard tie rod was carried out for a certain domestic turboprop regional aircraft,so as to provide an improved idea for the existing aircraft flight control system.The main research contents of this paper are as follows:First chapter is introduction,introduces the research background and significance of thesis,Through the analysis of the development status of the dual-duty mechanical flight control system at home and abroad,the main research objectives of improving the safety level of the aircraft by using the double-duty rigid tie rod mechanical flight control system are determined,and lays the foundation for the later research content.basis.In the second chapter,the overall layout design of the dual redundancy flight control system based on the hard tie rod is completed,and the detailed design of the system is carried out on the basis of CATIA software.The release mechanism of ailerons and elevators in the double redundant flight control system based on hard tie rod is designed,and the release force is determined by calculation.The natural frequencies and instability characteristics of the tie rod of the newly designed flight control system are calculated and analyzed.In the third chapter 3,the transmission characteristics of the system were analyzed by MSC.ADAMS multi-body dynamics analysis software.The optimization target and design variables are determined.After repeated iterations,the transmission ratio of the system is optimized,which makes the new transmission line system more fitting with the original transmission line system.In the fourth chapter,the principle test was carried out on a flight test system integrated test rig based on a real aircraft.Through the principle test,the rationality of the design scheme is verified.The optimization effect of multi-body dynamics software MSC.ADAMS was further verified.In the fifth chapter,safety analysis was carried out by means of functional safety analysis(FHA),fault tree analysis(FTA)and common cause failure impact analysis(CCA),and the safety analysis of the double-traffic flight control system based on hard rod was carried out.Explain the significance of the design scheme to improve the safety of the flight control system.The sixth chapter summarizes the research work of this paper and prospects the future research content.