Study on the Generation of the Tonal Noise Emitted from an Automobile Wheel

抄録

Due to the increase in wheel diameter and improvement in braking force recently, the tonal noise generated around the wheel at extremely low speed owing to the frictional vibration generated in the brake disc has become one of the problems. Research on the noise generation from the disk brake system of the vehicle have been carried out by many researchers but there are few researches focused on the noise generation by the resonation of the wheel. In this study, we used a commercial vehicle and measured the tonal noise generated around the wheel when the vehicle was moving low speed and the braking force was slightly working. Further, we simultaneously measured the vibrational acceleration on the wheel surface and performed modal analysis and operational transfer path analysis to investigate the mechanism of the noise generation. Results showed that the generated noise had the tonal peak at the harmonic frequency of 250 Hz. The vibration that contributed to the generation of the fundamental frequency of 250Hz noise was generated by the wheel near the ground and that contributed to the generation of the third harmonic noise was generated at the spoke of the wheel based on the natural frequency of the wheel.