Research On Optimization And Reliability Of Key Parts For Automotive Seat Angle-adjuster

The reliability of automobile seat angle-adjuster directly affects the safety of the vehicle.When the car has an accident,only if the seat angle-adjuster is safe and reliable can the seat back keep its original position and can the human body be protected.For improving the reliability of seat angle-adjuster,the quintic spline curve is used to optimize the cam profile.Thus the structure parameters of seat angle-adjuster are obtained.The bench test and finite element analysis of seat angle-adjuster are carried out,based on which the reliability analysis and evaluation of seat angle-adjuster are conducted.The main contents of this paper are stated as follows:(1)According to the load on seat angle-adjuster in the car accident,the static strength test of seat angle-adjuster is carried out.According to the structure and working principle of seat angle-adjuster,the quintic spline curve is used to optimize the cam profile.Then the profile curves of locking plate and leading plate are obtained.The structure parameters of new seat angle-adjuster are determined,which lays the foundation to the bench test and finite element analysis of seat angle-adjuster.(2)Finite element model of seat angle-adjuster is established based on the structure parameters of components.Then the stiffness and strength of key parts of seat angle-adjuster are analyzed and the stress distribution of it is obtained.The sample test of seat angle-adjuster is carried out according to the structure parameter of new seat angle-adjuster.(3)The reliability model of seat angle-adjuster is established,then the reliability of key parts of it is obtained based on the stress-strength interference model.According to the bench test and finite element analysis of seat angle-adjuster,the reliability analysis and evaluation of seat angle-adjuster are carried out based on the competition failure theory.The research results of this paper can provide a technical support for lightweight design and development of new seat angle-adjuster.This thesis can also provide the reference for optimization design and reliability research of other automobile systems.