南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (2): 205–212.doi: 10.13232/j.cnki.jnju.2022.02.003

• • 上一篇    

QRD位置对房间声场均匀度的影响研究

荣宁宁1, 贾尚宏2, 闵鹤群1()   

  1. 1.东南大学建筑学院，南京，210096
    2.安徽建筑大学建筑与规划学院，合肥，230022
  • 收稿日期:2021-02-03 出版日期:2022-03-30 发布日期:2022-04-02
  • 通讯作者: 闵鹤群 E-mail:hqmin@seu.edu.cn
  • 作者简介:E⁃mail：hqmin@seu.edu.cn
  • 基金资助:
    国家自然科学基金(51408113);江苏省自然科学基金(BK20140623)

Research on the influence of QRD position on room sound field uniformity

Ningning Rong1, Shanghong Jia2, Hequn Min1()   

  1. 1.School of Architecture, Southeast University, Nanjing, 210096, China
    2.School of Architecture and Planning, Anhuijianzhu University, Hefei, 230022, China
  • Received:2021-02-03 Online:2022-03-30 Published:2022-04-02
  • Contact: Hequn Min E-mail:hqmin@seu.edu.cn

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摘要：

QRD（Quadratic Remainder Diffuser）作为调控房间声场均匀度的常见材料，其在房间中的分布位置影响房间声场均匀度的调控效果.研究了QRD在房间中不同的位置分布对房间声场均匀度的影响.通过混响室实验测试的方法，改变QRD在混响室中的分布位置，测试了六种布置方案，研究频域、时域分析QRD位置的改变对不同测点间声压级关系的影响.结果发现：频域内，Sp（声压级平方的标准差）比SL（声压级的标准差）描述声场均匀度更加合适，尤其适用于低频声场；随着频率的升高，SL对声场均匀度的描述准确度提高；时域内，当房间内QRD的面积一定时，其均匀分布于房间的天花板或者侧墙时，声场内各点的声压级标准差较小，声场均匀度较好；为发挥QRD低频吸声的优势，应将其布置于房间低频模式声压值极大位置，即降低由于共振频率引起房间声场不均匀的影响程度.

关键词: QRD, 声场均匀度, 位置, 频域, 时域

Abstract:

QRD (Quadratic Remainder Diffuser) is a common material to control the sound field uniformity which of the distribution affects the uniformity of sound field in the room. This article describes the influence of QRD's different position distribution on the room's sound field uniformity through the method of experimental testing in the reverberation room. In the frequency and time domain,there are six layout schemes of the different distribution of QRD in the reverberation room,analyzing the influence of the change of QRD position through the sound pressure level relationship between different measuring points. In the frequency domain,the results show that Sp (standard deviation of the square of sound pressure level) is more suitable than SL (standard deviation of sound pressure level) to describe the uniformity of the sound field,especially suitable for low?frequency sound fields. With the increase of frequency, the accuracy of SL's description of sound field uniformity is improved. In the time domain,when the QRDs are evenly distributed on the ceiling or side wall with the constant area in the room,the standard deviation of sound pressure level at each point in the sound field is smaller and the sound field uniformity is better. To take the advantage of low?frequency sound absorption of QRD,it should be arranged at the position where the sound pressure value is maximum in the low?frequency mode of the room,which can reduce the influence degree of uneven sound field in the room caused by resonance frequency.

Key words: QRD, sound field uniformity, position, frequency, time domain

中图分类号: 

  • TU112

图1

隔声实验室中安装的QRD材料"

图2

实验室中QRD安装构造"

图3

实验中QRD扩散系数曲线"

图4

实验环境"

图5

实验仪器"

图6

实验测试系统连接"

图7

混响室实验测点布置"

图8

混响室中QRD六种布置方案"

图9

0~100 Hz，100~1000 Hz，1~10 kHz频率段分别对应的SL,SP曲线与声压级曲线关系"

图10

0~100 Hz,100~1000 Hz,1~10 kHz频率段（1/3倍频程）QRD不同布置方案的SP曲线"

图11

时域中QRD不同布置方案对应的测点声压级与标准差"

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