Structual Analysis And Experimental Study Of High Stress Taper Leaf Spring

Leaf spring is an important part of automobile.Compared with the traditional multi-leaf spring,the taper leaf spring has the advantages of light weight and better ride comfort,and is gradually applied to the truck.The structual optimization design and reliability improvement of the taper leaf spring are beneficial to reduce the use of resources and meet to the development trend of light weight.Therefore,this paper carries on the structual optimization design,the simulation analysis,the test verification and the research to the taper leaf spring with high stress,and the main research contents are as follows:The optimal design parameters are obtained by optimizing the calculation based on the optimization of quality and using the MATLAB software.Compared with several modeling methods,a simple and accurate modeling method-precompression modeling method is proposed.combined with the requirement of tight fitting of the two ends of each leaf spring after assembly,the end of each leaf spring in free state is reasonably designed.Based on CAE analysis software,the strength and stiffness of the designed taper leaf spring were analyzed and compared with the subsequent test to verify that the designed meets the strength and stiffness requirements.A flexible body model of leaf spring was established to verify that the dynamic stiffness of the designed leaf spring meets the design requirements,and the influence of loading frequency on the dynamic characteristics of leaf spring was analyzed.Friction was added to the spring-eye of main leaf spring to adjust the friction contact parameters,and the influence of dry friction on the dynamics of leaf spring was analyzed,so as to pave the way for the subsequent anlysis of the influence of dry friction at the spring-eye on the fatigue life of the single leaf spring.The fatigue characteristics of leaf spring were analyzed,and the fatigue life was corrected according to the influence of processing technology.compared with the test,the fatigue life of the design leaf spring was verified to meet the requirements.On the basis of verifying that the designed leaf spring meets the requirements of strength,static and dynamic stifness and fatigue characteristics,the influence of dry friction at spring-eye on the fatigue life of the single-piece spring is analyzed by using the fatigue analysis method in the previous chapter,and the friction coefficient was changed by using the knurled pin,and the fatigue test was carried out after assemblingwith the single leaf spring.On the basis of summarizing and analyzing the failure of the single taper leaf spring test,the test is modified and perfected.the test results basically verify the conclusion that the fatigue life of the main leaf spring decreases with the increase of the friction coefficient at the spring-eye.then,the reliability and stability of the test are discussed and analyzed based on the test results and according to the actual machining process of the leaf spring...