摘要
根据城市轨道交通车站的结构特点和噪声特性,设计并制作有空腔的吸声体;将1/4波长声管设置于吸声体中,以提高其对中低频轮轨噪声的吸收能力。通过单传声器脉冲响应法测试吸声体样品的吸声性能,结果表明:加装空腔和布置声管后,吸声体的中低频吸声能力明显提高。最后应用ANSYS和SYSNOISE软件,分别计算出安装该吸声体前后的车站声场,结果显示:安装吸声体后,候车点的声压降低2～5 dB。
Based on the structural and noise characteristics of urban railway stations, a sound absorber with wooden cavity structure was designed and 1/4 wavelength sound tube was installed in the absorber to increase its absorption capacity for the noises of middle and low frequencies. The Impulse Response Method （IRM） with single microphone was used to test the sound absorber＇ s absorption coefficient. The result shows that absorption capacity of the absorber for the noise of low and middle frequencies is greatly enhanced after the cavity and sound tube have been placed in. The sound fields of an urban rail transit station before and after sound absorber installation was calculated respectively by means of the software ANSYS and SYSNOISE. The results show that sound pressure of waiting point on the platform can be reduced by 2 -5 dB.
出处
《噪声与振动控制》
CSCD
2012年第3期163-165,176,共4页
Noise and Vibration Control
基金
江苏省高校自然科学研究基金(10KJD140002)
苏州大学青年教师自然科学基金
关键词
声学
车站噪声
吸声体
声管
空腔结构
吸声系数
acoustics
urban railway station noise
sound absorber
sound robe
cavity structure
absorptioncoefficient
