摘要
某高校原有混响室存在本底噪声过大,声场均匀性较差及检测数据不完整等问题,在不拆除原有基础建设的前提下,本文旨在优化设计使其符合国家规范,并获得检测数据相对标准的混响室.利用声场扩散理论对声学混响室的空间进行改造设计,最终将其空间尺寸的长、宽、高定为7.76 m、5.56 m、4.50 m,使其在满足规范GB/T 20247—2006要求的最大线度小于1.6倍体积前提下,保证长、宽、高的比值不成整数倍,以此来消除矩形空间的声简并共振现象.对混响室内表面进行隔声处理,使各个频率的最小吸声量满足现行规范GB/T 20247—2006的要求;对混响室内墙体进行弧形改造,对墙面涂刷金刚石颗粒,在顶部布置扩散体,使声场扩散时达到理想状态,并依照规范JJF 1143—2006对混响室进行校准.以某高校研发的吸音板作为标准试件进行测试,最后得到较完整的吸声系数曲线及平均吸声系数,用于分析材料在不同频率范围内的吸声特性.
The original reverberation room at an university exists many problems,such as excessive background noise,poor sound field uniformity,and incomplete test data.This paper aims to optimize the design of this reverberation room to conform with national standards.In this paper,the acoustic field diffusion theory is used to transform and design the space of acoustic reverberation room.The length,width and height of the space dimension are set as 7.76 m×5.56 m×4.50 m,which ensures that the ratio of length and width and height is not an integer multiple under the premise that the maximum linearity required by the standard GB/T 20247-2006 is less than 1.6 times of the volume.In this way,the phenomenon of acoustic degeneracy resonance in rectangular space can be eliminated.Sound insulation treatment is carried out on the surface of reverberation room to make the minimum sound ab‐sorption of each frequency meet the requirements of the current standard GB/T 20247-2006.The reverberation room wall was transformed with arc shape,the wall was coated with diamond particles,and the diffusion body was arranged on the top,so that the sound field diffusion reached the ideal state,and the reverberation room was calibrated in accordance with the standard JJF 1143-2006.A sound absorption board developed by an university was used as a standard test block,and a complete sound absorption coefficient curve and average sound absorption coefficient were obtained,and the sound absorption characteristics of the material in different frequency ranges were analyzed.
作者
梁新健
周红梅
LIANG Xinjian;ZHOU Hongmei(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处
《广西科技大学学报》
2021年第4期93-99,共7页
Journal of Guangxi University of Science and Technology
基金
广西自然科学基金项目(2018GXNSFAA281284)资助.
关键词
建筑声学
混响室
混响时间
降噪效果
声场扩散
吸声系数
building acoustics
reverberation room
reverberation time
noise reduction effect
acoustic field diffusion
absorption coefficient
作者简介
梁新健,在读硕士研究生;通信作者:周红梅,教授级高工,研究方向:新型建筑材料研发,E-mail:289953835@qq.com.
