中南大学学报（自然科学版）2018，Vol.49Issue(1)：253-260,8.DOI:10.11817/j.issn.1672-7207.2018.01.032
多孔材料声学参数辨识及其在城轨列车顶板隔声中的应用
Parameter identification of acoustic porous materials and its application in sound insulation of metro ceilings
摘要
Abstract
Structure optimization of adding porous materials to the double-layer hollow ceiling of metro trains with weak sound insulation ability was proposed to alleviate the serious interior noise when the metro trains were running in tunnels. Considering the difficulty of direct measurement of sound absorption characteristic of the porous materials, acoustic parameters were tested and then identified by the impedance tube tests and the acoustic parameters identification method. Sound insulation characteristics analysis model for a lightweight metro ceiling was established based on the transfer matrix method. The improvement of the sound insulation performance of metro ceilings filled with three typical porous materials was analyzed, and the effects of the porous materials' thickness and installation location on the sound insulation properties were investigated. The results show that the ceiling structure without noise reduction porous material has a sound insulation valley at 315 Hz. Adding porous material can not only effectively improve sound insulation performance at the sound insulation valley but also improve the overall sound insulation performance. It is shown that the noise reduction increases nonlinearly with the increase of the layer thickness of the porous materials. Taking cost into consideration, the optimal thickness of porous material is 16.5 mm. The effects of the porous material installation location on the sound insulation is not significant. It is recommended that the porous material should be placed close to either side of aluminum plate. The results of this study can provide a quantitative reference for the noise reduction of the typical lightweight metro train.关键词
声学参数辨识/城轨列车/顶板/隔声/多孔材料Key words
parameter identification/metro train/ceilings/transmission loss/porous materials分类
建筑与水利引用本文复制引用
姚丹,杜几平,张捷,王衡禹,肖新标..多孔材料声学参数辨识及其在城轨列车顶板隔声中的应用[J].中南大学学报（自然科学版）,2018,49(1):253-260,8.基金项目
国家自然科学基金资助项目(U1434201,51475390) （U1434201,51475390）
"十二五"国家科技支撑计划项目(2015BAG13B01-03) （2015BAG13B01-03）
牵引动力国家重点实验室自主探索课题(2015TPL_T08) (Projects(U1434201, 51475390) supported by the National Natural Science Foundation of China （2015TPL_T08）
Project(2015BAG13B01-03) supported by the National Science and Technology Pillar Program during the 12th "Five-Year" Plan Period of China, Project(2015TPL_T08) supported by the Scientific Research Foundation of State Key Laboratory of Traction Power, China) （2015BAG13B01-03）
