Mechanics Analysis Of A New Reduced Dof Hybrid Mechanism

The new reduced DOF hybrid mechanism come from auto-tilt device of thehelicopter’s main rotor and suitable for the ball-and-socket bearing fatigue testing machine.The study of the hybrid mechanism is a necessary means for the design and developmentof the ball-and-socket bearing fatigue testing machine and has important theoretical andpractical significance. In this paper, the analysis of the reduced DOF hybrid mechanism iscommitted to provide a theoretical basis for the design of the ball-and-socket bearingfatigue testing machine.Firstly, a new reduced DOF hybrid mechanism of inner and outer ring nesteddynamic connection mechanism is proposed in this paper. The article is mainly composedof: using the EDF method to analyze the DOF; positive and inverse displacement solutionand argument; by using the mechanism’s influence coefficient matrices, the mechanism’sinput speed and acceleration are obtained and differential coefficient method is testified; indifferent position and orientation of the hybrid mechanism, the kinetic characteristiccurves of hydraulic boosters, springs and ball-and-socket bearing are obtained by usingPro-e software; modal analysis of hybrid mechanism get10modal natural frequency;according to maximum stress state which comes from the dynamics simulation, staticanalysis of deformation and stress of hybrid mechanism prove the integrity of the hybridmechanism design.A theory model of ball-and-socket bearing fatigue testing machine of helicopter isproposed in this paper. Mechanical analysis to verify the mechanical design is reasonable,reliability and integrity. This paper provides a reference for the design of the newball-and-socket bearing fatigue testing machine.