Page 104 - 《应用声学》2023年第1期

第 42 卷 第 1 期 Vol. 42, No. 1
2023 年 1 月 Journal of Applied Acoustics January, 2023

⋄ 研究报告 ⋄

电动式换能器声源级起伏改善实验研究

杨 洋 1 桑永杰 1,2,3† 刘茂伊 1 蓝 宇 1,2,3

(1 哈尔滨工程大学水声工程学院 哈尔滨 150001)
(2 海洋信息获取与安全工信部重点实验室 (哈尔滨工程大学) 工业和信息化部 哈尔滨 150001)
(3 哈尔滨工程大学水声技术重点实验室 哈尔滨 150001)

摘要：电动式换能器由于存在内部声腔，导致辐射面上的负载在频域上出现极值，使得电动式换能器的声源级
响应出现起伏，给电动式换能器在宽带噪声模拟领域的应用带来了挑战。依据电动式换能器含有声腔的等效
电路分析结果，针对无声腔、有声腔、在声腔底部设置吸声棉和在声腔内充入氦气 4 种情况，使用加速度计测试
了辐射面的输出振速，归算出声源级曲线并加以比较。实验结果验证了声腔谐振导致电动式换能器频响曲线
出现起伏；在声腔内充入特性阻抗小的气体可有效地将声腔的谐振频率调节至工作频段以外，从而实现电动
式换能器在质量控制区平坦的响应输出。
关键词：电动式换能器；声腔；声源级；氦气；测试
中图法分类号: O427.9; O421+.2; O421+.4 文献标识码: A 文章编号: 1000-310X(2023)01-0100-07
DOI: 10.11684/j.issn.1000-310X.2023.01.013

Experimental research on improving source level fluctuation of
moving coil projector

YANG Yang 1 SANG Yongjie 1,2,3 LIU Maoyi 1 LAN Yu 1,2,3

(1 College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China)
(2 Key Laboratory of Marine Information Acquisition and Security Harbin Engineering University, Ministry of Industry and
Information Technology, Harbin 150001, China)
(3 Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China)

Abstract: Due to the acoustic cavity in moving coil projector, the load on the radiation surface has extreme
values in the frequency domain, which makes the source level response of the projector fluctuate. It is harmful
to the application of the projector in the field of broadband noise simulation. Base on the analysis result of the
equivalent circuit of moving coil projector containing the acoustic cavity, experimental research is carried out
in this paper. The output vibration velocity on the radiation surface was tested with the accelerometer for the
four cases: without acoustic cavity, with acoustic cavity, setting sound-absorbing cotton at the bottom of the
acoustic cavity, and filling helium gas in the acoustic cavity. Then the source level curves for the four cases are
calculated and compared. The experimental results verify that the resonance of the acoustic cavity can lead to
source level fluctuations; filling low characteristic impedance gas in the acoustic cavity can effectively improve
the fluctuation of the source level in the quality control area.
Keywords: Moving coil projector; Acoustic cavity; Source level; Helium gas; Test

2021-11-06 收稿; 2021-12-17 定稿
作者简介: 杨洋 (2000– ), 男, 山东人, 本科生。
† 通信作者 E-mail: sangyongjie@hrbeu.edu.cn