摘要
全、半封闭声屏障具有很好的降噪效果,但在铁路上应用较少。京雄城际桥梁地段全封闭声屏障为国内外首例时速350 km高速铁路桥梁全封闭声屏障,为研究其降噪效果,建立声学有限元-无限元模型、设立边界条件和等效声源等,通过全真仿真模拟对全封闭声屏障降噪效果进行预测。结果表明,实施全封闭声屏障后,其插入损失值在20.2~20.5 dB(A)之间;同时发现在声屏障内侧设置吸附材料后,全封闭声屏障内部混响场总噪声级降低了8.3 dB(A),其中对高频噪声有更加显著的降噪效果。通过对京雄城际(K81+718)全封闭声屏障设置段进行现场测试,测试显示:当动车组以350 km/h速度通过全封闭声屏障时,插入损失值为19.8~20.1 dB(A),满足设计降噪效果要求和国家相关标准。
Full and semi enclosed sound barriers have good noise reduction effect, but they are rarely used in railway. The fully enclosed sound barrier in the bridge section of Beijing-Xiong’an Intercity Railway is used the first time for 350 km/h high-speed railway bridges at home and abroad. In order to study the noise reduction effect, the acoustic finite element infinite element model, boundary conditions and equivalent sound source are established, and the noise reduction effect of the fully closed sound barrier is predicted through full truth simulation. The results show that after the implementation of the fully enclosed sound barrier, the insertion loss is between 20.2~20.5 dB(A). Meanwhile, it is found that the total noise level of the reverberation field inside the barrier is reduced by 8.3 dB(A) after the adsorption material is put in place inside the sound barrier, which obtains more significant noise reduction effect on high-frequency noise. The field test on the barrier setting section of Beijing-Xiong ’an Intercity Railway(K81+718) shows that when the EMU passes through the fully enclosed sound barrier at the speed of 350 km/h, the insertion loss value is 19.8~20.1 dB(A), which meets the requirements of design noise reduction effect and relevant national standards.
作者
辛思远
张世峰
王晓伟
XIN Siyuan;ZHANG Shifeng;WANG Xiaowei(China Railway Economic and Planning Research Institute Co.,Ltd.,Beijing 100038,China;China Railway Design Group Co.,Ltd.,Tianjin 300308,China;Energy Saving and Environmental Protection and Occupational Safety and Health Research Institute,China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China)
出处
《铁道标准设计》
北大核心
2022年第6期163-168,共6页
Railway Standard Design
基金
中国铁路总公司科技研究开发计划系统性重大项目(P2018G004)。
关键词
城际铁路
全封闭声屏障
降噪
仿真模拟
现场测试
intercity railway
totally enclosed sound barrier
noise reduction
analogue simulation
field test
