文章摘要
毛燕蓉,沈勇.微型扬声器摆动模态对其辐射声场的影响*[J].,2019,38(2):217-222
微型扬声器摆动模态对其辐射声场的影响*
Analysis of the influence of rocking modes on the sound field radiated by micro speakers
投稿时间:2018-08-28  修订日期:2019-03-01
中文摘要:
      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。本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。
英文摘要:
      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.
DOI:10.11684/j.issn.1000-310X.2019.02.010
中文关键词: 微型扬声器单元,摆动模态,声压级,指向性
英文关键词: Micro speakers, Rocking modes, SPL, Directivity.
基金项目:有限长近似线声源声学特性研究 (11274172)
作者单位E-mail
毛燕蓉 南京大学声学研究所 近代声学教育部重点实验室 myrnju@163.com 
沈勇 南京大学声学研究所 近代声学教育部重点实验室 njuyshen@126.com 
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