Page 71 - 应用声学2019年第2期

第 38 卷 第 2 期 Vol. 38, No. 2
2019 年 3 月 Journal of Applied Acoustics March, 2019

⋄ 研究报告 ⋄

微型扬声器摆动模态对其辐射声场的影响 ∗

毛燕蓉 沈 勇 †

(南京大学声学研究所 近代声学教育部重点实验室 南京 210093)

摘要 与传统电动式扬声器单元相比，微型扬声器单元由于缺少定位支片等部件，更容易受到摆动模态的影
响。该文利用激光传感器采集微型扬声器单元振膜各点振动位移，通过理论计算，从辐射声压级、辐射指向性
等角度探究矩形微型扬声器单元摆动模态对其辐射声场的影响。经过研究发现，摆动模态会造成微型扬声器
单元频响凹陷、中低频存在指向性等现象，对其辐射声场产生明显的影响。
关键词 微型扬声器单元，摆动模态，声压级，指向性
中图法分类号: O42 文献标识码: A 文章编号: 1000-310X(2019)02-0217-06
DOI: 10.11684/j.issn.1000-310X.2019.02.010

The influence of rocking modes on the sound field radiated
by micro speakers

MAO Yanrong SHEN Yong

(Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing 210093, China)

Abstract Due to the lack of the spider, micro-speakers are more susceptible to the influence of rocking modes
compared with the conventional electro-dynamic loudspeaker. In this paper, the influence of rocking modes on
micro speakers is analyzed in consideration of the sound pressure response and the radiation directivity. The
displacement of the diaphragm is collected using laser sensors and the sound field radiated by micro-speakers
with rocking is obtained by theoretical calculation. It is found that rocking modes have a significant impact on
the sound field radiated by causing unusual dips on the sound pressure responses and resulting in directivity
at low frequency.
Key words Micro speakers, Rocking modes, Sound pressure level, Directivity

2018-08-28 收稿; 2018-11-02 定稿
有限长近似线声源声学特性研究 (11274172)
∗
作者简介: 毛燕蓉 (1994- ), 女, 甘肃兰州人, 硕士研究生, 研究方向: 声学。
† 通讯作者 E-mail: yshen@nju.edu.cn