摘要
轮轨噪声是轨道交通噪声的主要组成部分,车轮振动声辐射是轮轨噪声主要声源之一,因此,低噪声车轮的研究是降低轨道交通噪声的研究重点。以国内现有某直型辐板地铁车轮为基体,设计并安装一种新型辐板屏蔽式阻尼装置,针对该阻尼车轮,在半消声室内进行试验研究。试验中采用力锤及落球两种激励方式,分析辐板屏蔽式阻尼车轮振动声辐射特性。研究结果表明,该新型阻尼车轮的模态阻尼比显著提高,对于800 Hz以上各阶模态阻尼比均提高一个数量级;阻尼车轮在整个频域范围(0～6 400 Hz),振动频响函数幅值明显低于标准车轮,尤其在中高频区域;阻尼车轮在径向和轴向激励条件下的总辐射声能量级分别降低12.4～13.5 dB和12.4～14.7 dB。在车轮辐射噪声显著频带内,双侧阻尼车轮辐射声能量降低15 dB左右。
The wheel/rail noise is the main component of the urban rail traffic noise. Low noise wheel is a key measure for reducing noise of train. A new type of web-mounted noise shielded and vibration damped device is designed and installed on a straight web metro wheel Acoustic experiments of this new type damped wheels are carried out in a semi-anechoic chamber. Using a force-hammer and a 25 mm diameter steel ball to hit the wheel as the excitations, the frequency response and the acoustic radiation characteristics of the damped wheel can be obtained through the tests. The experimental results show that the damping ratio of the damped wheel increases significantly. The modal damping ratio increases by more than 10 times above 800 Hz, compared to the original wheel. The amplitude of the frequency response function reduces significantly in the frequency range of 0-6 400 Hz. Under the radial and axial excitations, the sound energy level of the damped wheel decreases by 12.4-13.5 dB and 12.4-14.7 dB, respectively. In some significant frequency bands, the sound energy level of the damped wheel decreases about 15riB.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第10期1-7,共7页
Journal of Mechanical Engineering
基金
教育部创新团队(IRT1178
SWJTU12ZT01)
四川省科技支撑计划(2010GZ0226)
西南交通大学牵引动力国家重点实验室自主研究课题(2012TPL-T17)资助项目
关键词
轮轨噪声
阻尼车轮
声学试验
辐板屏蔽式阻尼装置
Wheel/rail noise Damped wheel Acoustic experiments Noise shielded and vibration damping device
