低频用周期性结构管道的研究  

The study of periodical structure tube for low-frequency

作　　者：薛政[1] 沈勇[1] 朱舸[1] 夏洁[1] XUE Zheng;SHEN Yong;ZHU Ge;XIA jie(Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University, Nanjing 210093, China)

机构地区：[1]南京大学声学研究所近代声学教育部重点实验室,南京210093

出　　处：《应用声学》2017年第3期200-204,共5页Journal of Applied Acoustics

基　　金：有限长近似线声源声学特性研究(11274172)

摘　　要：在扬声器单元的一侧耦合管道是解决声短路,实现低频下潜的有效方法。本文研究了一种周期性结构管道,对其低频辐射特性进行理论分析,提出了使用周期性结构管道代替传统均匀管道以缩短长度。在实际的扬声器单元上分别耦合传统的均匀管道和周期性结构管道,实验结果与理论计算基本吻合。结果表明,为实现相同的低频下潜,合理的周期性结构可以有效地缩短管道长度,从而具有更高的实用价值。It is an effective method to solve the problem of acoustical shortcut and deep low frequency limit to couple a tube to a loudspeaker driver.This article studies a new kind of tube with periodical structure and analyzes the low frequency radiation characteristic theoretically.It is proposed that replace the traditional tube with the new tube to shorten the length of tube.Experiment is consistent with theoretical calculations that add uniform tube and periodical structure respectively to a loudspeaker driver.Results show that,to realize the same low frequency depth,reasonable periodical structure can shorten the length of the tube efficiently,therefore,it has more practical value.

关 键 词：传输线 周期性结构 低频下潜 

分 类 号：O42[理学—声学]