Analysis And Evaluation Platform For Front Wheel Shimmy System

According to the current research, there are many factors influencing the front wheel shimmy, in order to systematically analysis the main causes which cause the front wheel shimmy and easy to take measures to control the front wheel shimmy, in this study,the tire mechanics model which applied to the dynamics analysis model of Shimmy system is fixed and in order to satisfy the requirements of engineering application, an analysis and evaluation platform for front wheel shimmy system is established.Vehicle front wheel shimmy often occurs in terms of non-steady state, using the steady state tire model for dynamic analysis may cause error. In this paper, in order to identify the parameters of the "magic formula" tire model and unified steady state tire mode, a six-component test of tire is conducted. In order to reduce the error, the precision of the two tire model are verified. Based on this, the nonlinear dynamics analysis model of the front wheel shimmy which contains unsteady state tire model is established.In this paper,in order to improve the efficiency of shimmy analysis and form a more complete dynamics analysis system of the vehicle shimmy, an analysis and evaluation platform for front wheel shimmy system is established. The platform covers the experimental data processing, shimmy model selection, the results of numerical algorithm selection, model parameter setting, shimmy analysis and evaluation, etc.Using the analysis and evaluation platform for front wheel shimmy system to analyze the non-steady state vehicle shimmy system under different tire Vertical load、front wheel alignment parameter、steering system parameters、clearance of the Steering system, etc. The analysis show that under tire’s non-steady state, the quasi-periodic motion and the jump of shimmy amplitude appear earlier compared with tire’s steady state, but the shimmy amplitude smaller. On the basis of calculating parts energy, we find that the influence on the tire energy and the impact on the shimmy amplitude are coincident.