近场声全息重建参数对隔声测量精度的影响

doi:10.12141/j.issn.1000-565X.240029

华南理工大学学报(自然科学版) ›› 2024, Vol. 52 ›› Issue (11): 1-8.doi: 10.12141/j.issn.1000-565X.240029

• 土木建筑工程 • 下一篇

近场声全息重建参数对隔声测量精度的影响

王红卫¹^,²(), 张光耀¹, 沈涛³(), 李淑洁¹, 杨晨曦¹, 张阳¹

^1.华南理工大学建筑学院，广东广州 510640
^2.华南理工大学亚热带建筑与城市科学全国重点实验室，广东广州 510640
^3.华南理工大学基建处，广东广州 510640

收稿日期:2024-01-16 出版日期:2024-11-25 发布日期:2024-06-07
通信作者: 沈涛（1982—），男，工程师，主要从事文物建筑修缮研究。 E-mail:tshen@scut.edu.cn
作者简介:王红卫（1975—），男，教授，博士生导师，主要从事建筑声学和环境声学研究。E-mail:wanghw@scut.edu.cn
基金资助:
国家自然科学基金资助项目(52078218)

Influence of Near-Field Acoustic Holography Reconstruction Parameters on the Accuracy of Sound Insulation Measurement

WANG Hongwei¹^,²(), ZHANG Guangyao¹, SHEN Tao³(), LI Shujie¹, YANG Chenxi¹, ZHANG Yang¹

^1.School of Architecture，South China University of Technology，Guangzhou 510640，Guangdong，China
^2.State Key Laboratory of Subtropical Building and Urban Science，South China University of Technology，Guangzhou 510640，Guangdong，China
^3.Infrastructure Department，South China University of Technology，Guangzhou 510640，Guangdong，China

Received:2024-01-16 Online:2024-11-25 Published:2024-06-07
Contact: 沈涛（1982—），男，工程师，主要从事文物建筑修缮研究。 E-mail:tshen@scut.edu.cn
About author:王红卫（1975—），男，教授，博士生导师，主要从事建筑声学和环境声学研究。E-mail:wanghw@scut.edu.cn
Supported by:
the National Natural Science Foundation of China(52078218)

摘要/Abstract

摘要：

等效源法近场声全息可以开展建筑构件隔声测量的工作。采用近场声全息测量构件隔声量时，重建参数对声场重建结果影响显著。基于对等效源法近场声全息隔声测量理论的分析，利用传声器阵列测得构件表面的复声压信号，通过声场重建得到构件的隔声量和表面法向声强分布。为进一步探究重建参数对等效源法近场声全息隔声测量精度的影响，通过控制变量法在隔声室开展以传统声压法为对比的建筑构件隔声测量实验。结果表明：当等效源面位置从-2 cm变化至-5 cm时，表面法向声强的重建平均误差值由3.9 dB增大至5.6 dB，隔声量的重建平均误差值由5.2 dB增大至6.9 dB，测量误差随等效源面距离而增大，因此等效源面宜靠近声源面；当全息测量面距离为4、8和16 cm时，表面法向声强的重建平均误差值分别为0.6、1.9和5.5 dB，隔声量的重建平均误差值分别为0.9、1.4和4.6 dB，测量误差随全息测量面距离而增大，因此建议全息测量面距离保持在8 cm之内；当等效源点数目与全息面测点数目一致时，与传统声压法差异仅为0.84 dB，当二者数目不一致时，隔声量和表面法向声强平均误差值均增大至4.6~6.8 dB。通过对重建参数进行优选可以有效提高构件隔声测量精度，对实验室测量建筑构件隔声性能与方法有重要借鉴意义，同时在隔声测量技术的实际运用中有较高的参考价值。

关键词: 声全息术, 声场测量, 隔声测量, 重建参数, 等效源法

Abstract:

Equivalent source method near-field acoustic holography can be applied in sound insulation measurement of the building components. When near-field acoustic holography is used to measure the sound insulation volume of components, the reconstruction parameters significantly affect the acoustic field reconstruction results. Based on the theoretical analysis of near-field holographic acoustic insulation measurement by equivalent source method, the compound sound pressure signal of the surface of the component was measured by the microphone array, and the sound insulation volume and surface normal sound intensity distribution of the component were obtained through the acoustic field reconstruction. To further investigate the influence of reconstruction parameters on the accuracy of equivalent source method near-field acoustic holography, experiments on sound insulation measurement of building components were carried out in the sound insulation room by the control variable method in comparison with the traditional sound pressure method. The results show that when the position of the equivalent source surface changes from -2 cm to -5 cm, the average error value of the reconstruction of the surface normal sound intensity increases from 3.9 dB to 5.6 dB, and the average error value of the reconstruction of the sound insulation volume increases from 5.2 dB to 6.9 dB, and the measurement error increases with the distance of the equivalent source surface, so it is suitable for the equivalent surface to be close to the sound source surface. When the holographic measurement surface distance is 4, 8, and 16 cm, the average error values of the reconstruction of the surface normal sound intensity are 0.6, 1.9, and 5.5 dB, and the average error values of the reconstruction of the sound insulation volume are 0.9, 1.4, and 4.6 dB, respectively. The measurement errors increase with the holographic measurement surface distance, so it is recommended to keep the holographic measurement surface distance within 8 cm. When the number of equivalent source points is consistent with the number of measuring points on the holographic surface, the difference with the traditional sound pressure method is only 0.84 dB. When the number of equivalent source points is inconsistent with the number of measuring points on the holographic surface, the average error values of the reconstruction of the sound insulation volume and surface normal sound intensity distribution increase to 4.6~6.8 dB. By optimizing the reconstruction parameters, the accuracy of component sound insulation measurement can be effectively improved. It has important reference significance for laboratory measurement of sound insulation performance and methods of building components and has high reference value in the practical application of sound insulation measurement technology.

Key words: acoustic holography, acoustic field measurement, sound insulation measurement, reconstruction parameter, equivalent source method

中图分类号:

TU112.2

王红卫, 张光耀, 沈涛, 等. 近场声全息重建参数对隔声测量精度的影响[J]. 华南理工大学学报(自然科学版), 2024, 52(11): 1-8.

WANG Hongwei, ZHANG Guangyao, SHEN Tao, et al. Influence of Near-Field Acoustic Holography Reconstruction Parameters on the Accuracy of Sound Insulation Measurement[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(11): 1-8.

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频率/Hz	隔声量/dB		\|ΔR\|/dB
频率/Hz	声压法	等效源法	\|ΔR\|/dB
500	33.8	34.2	0.3
630	36.6	37.1	0.5
800	36.9	38.0	1.1
1 000	36.3	37.6	1.3
1 250	39.1	40.5	1.4
1 600	42.2	42.6	0.4
2 000	44.8	46.0	1.2
2 500	45.6	46.5	0.9
3 150	45.4	45.9	0.5

近场声全息重建参数对隔声测量精度的影响

Influence of Near-Field Acoustic Holography Reconstruction Parameters on the Accuracy of Sound Insulation Measurement

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