Finite Element Analysis For Main Shaft System Of Experimental Bench

Failure rate of the helicopter is far beyond the fixed wing aircraft. The reasons for it are that design features of helicopter itself, working conditions and environment. There are two main reasons for the high failure rate. The first is vibration and fatigue caused by cyclic loading of rotor wing and tail rotor. The second is mal-condition of using and formidable natural conditions. Rotor wing has enormous function on the improvements of helicopter, and bring a series of influence to mobility, maneuverability, velocity, vibration, longevity, security, maintainability, and so on. Every country in the world regards rotor wing as key technology of helicopter.Experimental bench of rotor wing system is a kind of way extensive used both at home and abroad for test of rotor wing. It is mainly used to experimental investigation for pneumatic, dynamics, flight dynamics of rotor wing. By test, it can guarantee dynamical equilibrium of the wing group. Nanjing University of Aeronautics and Astronautics took lead in related field. The lab of it built an experimental bench for prototype of rotor wing. This dissertation analyzes the main shaft system of experimental bench by finite element method.This dissertation is mainly about the analysis of main shaft during the process of working. During the process of working, the main shaft is under acting on together by periodic exciting forces and torque. The exciting forces include lifting force and lateral force generated by rotor wing. The process of it is building a finite element model to simulate the main shaft, and get dynamic response (include modal analysis and response in harmony), longevity, fatigue. It has meaning both in theory and realistic for development of similar main shaft system.