Research On Tire In-plane Mechanical Properties By High-frequency Excitation

During the running process of the vehicle, the tire will show different mechanicalproperties caused by different input conditions. Low-frequency mechanical properties ofthe vehicle has been deeply researched and some important results have been achieved,but there is less research on the mechanical properties by high-frequency excitation, andmost of the research is based on the tire ring model. When the vehicle is running passsmall size obstacles such as uneven road, or undergoing emergency braking or driving, thetire mechanical properties will have a big difference with that by low-frequency excitation,which is because the high-frequency excitation causes the tire belt vibration relatively tothe wheel, resulting in the changes and fluctuations of forces. In this paper, we use theFEM tire model to research on the tire mechanical properties by high-frequency excitation,and also do some mechanism analysis. Finally we do some exploitation on thesimplification of the FEM tire model due to the low efficiency of the FEM model. Weincrease the computational efficiency and keep the accuracy at the same time.The first chapter is the introduction, which mainly introduces the developmentbackground of mechanical properties of tire, and also introduces the recent research statusof tire mechanical properties by high-frequency excitation. The methods used on tiremechanical properties by high-frequency excitation by the FTire model and SWIFT modelare also introduced.The second chapter is about the FEM tire model, which mainly introduces the basictheory of FEM and choice of the nonlinear FEM software, the modeling process of FEMtire model used in this paper is also included.The third chapter is the cleat simulation of the FEM tire model under different kindsof conditions such as different load, tire pressure and speed, the result is the response of vertical force and longitudinal force response to time. The results of the simulation and thetest are compared and analyzed.The fourth chapter is the mechanism analysis of the tire in-plane mechanicalproperties using the FEM simulation results. Through the tire modal analysis, theinfluence of the tire parameters on natural frequency is analyzed.The fifth chapter is simplification of the FEM tire model, the side is simplified to thespring of radial and tangential and lateral directions. The belt is also simplified.The sixth chapter is the summary and prospect.