摘要
为提高气流扬声器的发声强度,基于共振原理,通过实验研究了不同尺寸的变截面和等截面管对其发声特性的影响.结果表明,变截面管起到喇叭的作用,而1/4波长的等截面管具有共振作用.含声波的气流周期性地通过变截面管在其出口1 m处能产生声压级为137.2 dB的高声强行波,而通过等截面管能形成最高声压级为120dB的声波.
Based on the principle of resonance to improve the sound intensity of loudspeaker, the effect of the sound characteristics of loudspeaker with different size of varying and constant cross- section tubes was studied by experiments. The results showed that the varying cross-section tubes are good radiators and the constant cross-section tubes of 1/4 wave length are good resonators. Air flow with sound periodically pass through varying cross-section tubes generating 137.2 dB high intensity sound at lm distance from the outlet of the tube, whereas 120 dB for constant cross-section.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2008年第8期715-718,共4页
Transactions of Beijing Institute of Technology
基金
国家部委预研项目(51326030103B)
关键词
气流扬声器
谐振管
低频
高声强
loudspeaker
resonance tube
low frequency
high intensity sound
