分流扬声器用于封闭空间降噪的布放研究

doi:10.13232/j.cnki.jnju.2023.05.001

南京大学学报(自然科学版) ›› 2023, Vol. 59 ›› Issue (5): 731–741.doi: 10.13232/j.cnki.jnju.2023.05.001

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分流扬声器用于封闭空间降噪的布放研究

徐陈淳, 王有藩, 陶建成()

教育部近代声学重点实验室，南京大学声学研究所，南京，210093

收稿日期:2023-06-03 出版日期:2023-09-30 发布日期:2023-10-13
通讯作者: 陶建成 E-mail:jctao@nju.edu.cn
基金资助:
国家自然科学基金(11874218)

A study of the placement of shunt loudspeakers for noise reduction in enclosed spaces

Chenchun Xu, Youfan Wang, Jiancheng Tao()

Institute of Acoustics of Nanjing University，Key Laboratory of Modern Acoustics，Ministry of Education，Nanjing，210093，China

Received:2023-06-03 Online:2023-09-30 Published:2023-10-13
Contact: Jiancheng Tao E-mail:jctao@nju.edu.cn

摘要/Abstract

摘要：

分流扬声器将入射声能转化成电能进行储存和耗散，可作为一种共振吸声体.对界面刚性的长方体封闭空间建立解析模型，分析在顶面布放分流扬声器时布放方式对空间内低频噪声的控制效果.数值仿真表明：在封闭空间本征频率附近，布放分流扬声器可有效降低空间内的平均声压级；当分流扬声器数目有限时，布放在初始声压级大的区域能产生更好的降噪效果；长方体顶角是所有模态响应较大的位置，因此是宽带降噪时布放分流扬声器的较优选择.地面铺设吸声材料后，封闭空间内平均声压级整体降低，但上述分流扬声器布放方式的影响规律依然存在.最后，实验验证了数值仿真结果.

关键词: 分流扬声器, 封闭空间噪声控制, 低频, 布放优化

Abstract:

The shunt loudspeaker can be used as a resonant sound absorber，as it can convert incident sound energy into electrical energy for storage and dissipation. In this paper，an analytical model is established for a rectangular rigid enclosure with shunt loudspeakers on the ceiling to analyze the noise reduction performance at low frequencies. Numerical simulations show that the sound pressure level inside the enclosure can be significantly reduced at its characteristic frequencies by using shunt loudspeakers. Better noise reduction is achieved when the shunt loudspeakers with limited numbers are placed at the locations with high initial noise level. Therefore，the top corners of the rectangle enclosure are optimal locations when employing shunt loudspeakers for broadband noise reduction，because large responses occur there for all the enclosure modes. If the ground is covered with sound absorption materials，the placement effects of the shunt loudspeakers on the noise reduction still remain although the overall sound pressure level in the enclosure decreases. Finally，experiments are conducted to verify the numerical simulation results.

Key words: shunt loudspeaker, noise control in enclosure, low frequency, placement optimization

中图分类号:

O429

徐陈淳, 王有藩, 陶建成. 分流扬声器用于封闭空间降噪的布放研究[J]. 南京大学学报(自然科学版), 2023, 59(5): 731–741.

Chenchun Xu, Youfan Wang, Jiancheng Tao. A study of the placement of shunt loudspeakers for noise reduction in enclosed spaces[J]. Journal of Nanjing University(Natural Sciences), 2023, 59(5): 731–741.

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频率	145 Hz			168 Hz
分流扬声器布放方式	不布放方式(a)	最优布放方式(d)	顶角布放方式(f)	不布放方式(a)	最优布放方式(e)	顶角布放方式(f)
SPL_s		65.0	64.5		65.3	64.7
SPL_r	62.3	56.1	56.6	62.7	56.7	57.3
ΔSPL_r		6.2	5.7		6.0	5.4

	分流扬声器布放方式	方式(a)	方式(b)	方式(c)	方式(d)	方式(e)	方式(f)
147 Hz	SPL_s		87.7	83.7	89.9	87.5	89.6
	SPL_r	87.4	74.4	84.1	77.0	80.7	77.7
	ΔSPL_r		13.1	3.3	10.5	6.7	9.7
171 Hz	SPL_s		86.2	82.6	85.9	88.2	87.9
	SPL_r	85.8	74.7	81.7	80.5	77.6	78.7
	ΔSPL_r		11.2	4.1	5.3	8.2	7.2

	分流扬声器布放方式	方式(a)	方式(b)	方式(c)	方式(d)	方式(e)	方式(f)
147 Hz	SPL_s		82.7	78.3	84.9	82.6	84.6
	SPL_r	82.8	73.6	81.0	75.8	78.6	76.4
	ΔSPL_r		9.3	1.9	7.0	4.3	6.4
169 Hz	SPL_s		82.4	78.9	82.6	84.5	84.0
	SPL_r	82.5	73.9	79.7	78.6	76.1	77.1
	ΔSPL_r		8.6	2.8	3.9	6.4	5.3

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分流扬声器用于封闭空间降噪的布放研究

A study of the placement of shunt loudspeakers for noise reduction in enclosed spaces

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