Research on Test and Parameter Identification for Nonlinear Stiffness Characteristics of Leaf Spring

摘要

The leaf spring is a key component of heavy vehicle suspension. The stiffness characteristic has an important influence on vehicle ride comfort and road friendliness. Firstly, the structural features and working principle of leaf spring are introduced. Secondly the detail testing scheme of the leaf spring is proposed and the stiffness characteristics are tested through cascaded loading and unloading. The tested results show that the leaf spring has the typical features of non-linearity and hysteresis. In order to satisfy the vehicle dynamics simulation, the Fancher model is chosen to describe leaf spring nonlinear characteristics. Finally, the LSM (Least Squares Method) is utilized to identify five parameters of Fancher model based on experiment results.