Method of Experimental Identification of Change in Dynamic Characteristics of Rolling Tires

Development of simulation technology for road noise while a vehicle is in operation has become an important issue. Because a fixed technological architecture has been established for simulation of the body and the suspension, the issue in realizing road noise simulation is how to accurately identify the force transmitted to the suspension through the tires and wheels by vibration input due to contact between the road surface and the tires. The issue here is that there are significant variations between static state characteristics, which are easy to measure, and vibration characteristics of tires in motion, which are challenging to measure. A variety of expertise regarding the sources of this discrepancy has been published. Among these, the effects of Coriolis and centrifugal forces resulting from the rolling motion are known. However, knowledge is still lacking in areas such as the specifics of how the input from the tires changes due to these fluctuations in characteristics. In this project, a simple method was proposed that makes it possible to verify fluctuations of transmission force in the range from 0 to 200Hz, using mass-production tires and wheels. The method also describes the contents of research in which fluctuations in characteristics were evaluated and analyzed with a particular focus on characteristics that contribute significantly to the road noise performance of the tires. The results of this method were verified using a CAE model implementing physical formulas for gyro moment and Coriolis force.