방음차륜의 소음진동 저감효과에 관한 연구

초록

Wheel/rail interaction has been known as a major source of railway noise. In this paper, a low noise wheel structure is developed and its effect on noise reduction is investigated. The developed low noise wheel employees a ruber material inserted into a steel rim or mounted on the wheel surface. Since the low noise wheel has low stiffness and high damping ratio compared to a solid wheel the measurement results show that it reduces the rolling and squeal noise. It turns out that the proposed wheel could reduce interior noise level by 4-5dB and vehicle vibration level by 7-10dB. Although the proposed structure seems to be promising in noise reduction of railway vehicles the low noise wheel is to be verified in endurance and cost effect.