2020 年 5 巻 p. 163-168
Tire cavity resonance is one source of noise inside cars. In the case of a deformed tire, this resonance splits into horizontal and vertical modes around the fundamental mode in the range of 180-280 Hz. The frequency difference between these two modes is derived theoretically using Thompson theory and modeling the tire cavity as a stepped tube. However, theoretical and experimental results do not agree in cases of substantial deformation. In this study, we expand the theory by using a multiple-stepped-tube model. The model geometrical parameters and the difference between the two modes are measured using a multi-microphone system. For the tire conditions of the tire load of 5 kN and the internal pressure of 200 kPa, the result of the expanded theory agrees with the experimental results comparing to other theories.
