Bionic Design And Finite Element Analysis Of The Working Surface Of The Ball Hinge Of The Thrust Rod Of The Automobile

The thrust rod is a key component of commercial vehicles,which can transmit forces and moments during vehicle movement and play the role of a flexible connection.The thrust rod can cushion the vibration and shock generated by the vehicle during the driving process,which plays an important role in the comfort of the occupants and the stability of the vehicle.The optimal design of the working surface of the thrust rod ball hinge is the focus of the research work in this paper.In this thesis,we take the foot pad structure of locust hind legs as the bionic object,and make a comparative study of the working surface of the thrust rod ball hinge with or without the foot pad structure of locust hind legs,and design bionic flexible projections on the rubber body surface of the thrust rod ball hinge.The accurate 3D model was established using Catia software,the model was reasonably simplified and meshed using Hypermesh software,and finite element analysis was performed using Abaqus software.This thesis also compares and analyzes the experimental results and simulation results of the static stiffness of the original thrust rod ball hinge to verify the validity and accuracy of the finite element modeling and analysis.The thrust rod ball hinge is subjected to four main types of loads during operation:radial,axial,deflection and torsion.In this thesis,the four parameters of radius,height,spacing and number of groups of bionic projections are used as experimental variables to investigate the effects on the static stiffness of thrust rod ball hinge under the above four loads.At the same time in the process of vehicle driving,the thrust rod ball hinge will be affected by the superposition of road vibration and the vehicle’s own mechanical vibration.Therefore,this thesis also explores the effect of the above four loads on the dynamic stiffness of the thrust rod ball hinge,and sets four vibration amplitude curves at 5 Hz,10 Hz,15 Hz and 20 Hz,and also investigates the dynamic stiffness of the thrust rod ball hinge at different frequencies.In order to determine the effect of each variable on the stiffness of the ball hinge of the thrust rod,the orthogonal experimental method is used in this thesis to analyze the variation law of radial static stiffness under four influencing factors(radius,height,spacing,and number of groups of bumps).Combined with the extreme difference analysis to determine the primary and secondary relationship between the four influencing factors for affecting the radial static stiffness,the bionic optimization design scheme is proposed for the thrust rod ball-hinged rubber working surface.