A New Model And The Static And Dynamic Characteristic Studying For Leaf Spring

The leaf spring is an elastic part of the suspension, which is widely used for its simple structure and mature technology. It is an important safety component burdening high load and plays an important role in automobile production and application. So that, it is one of the key factors for vehicle design to determine the performance and structural parameters of the leaf spring rationally. This is of great significance to increasing the service life of a vehicle and improving its ride comfort and safety. In traditional methods of the leaf spring, it is usually considered as a straight beam. Their analyses are based on some assumptions. But there is a bigger gap between the assumptions and the actual force and deformation of the leaf spring. Thus, the accuracy of their analyses is not high. For this reason, the search for a precise semi-analytical method to solve the poor precision and low efficiency issues of the leaf spring is necessary.Firstly, this paper introduced the traditional calculation methods of the leaf spring, and analyzed and compared them simply. Then the curved beam theory and precise integration method were introduced systematically. Based on them, a new model– the layered curve beam model of the leaf-spring was constructed.After that, by neglecting or considering interleaf friction, two layered curve beam models of the multi-leaf spring with equal section were established. On the basis of above models, the static and dynamic characteristics of the multi-leaf spring were analyzed by the MATLAB software. The comparisons between the results of present method and the CAE finite element method and the traditional calculation methods verified the accuracy of the proposed method strangely. By considering the interleaf friction, the precision of the spring computation model was further enhanced.In addition, the layered curve beam model of a few-leaf-spring with variable section was built and their static and dynamic characteristics were analyzed. The paper also compared with the results of present method and the CAE finite element method and the traditional calculation method. It shows the accuracy and advantages of the present model.For the big deformation problem of the leaf spring (geometric nonlinear) in the work process, a gradual approximation method based on the linear model is adopted to analyze and discuss the stiffness of the multi-leaf spring with equal section. It provides a certain theoretical reference for the practical application.