一种强声气动声源的理论与实验研究  

Theoretical and experimental investigation of a kind of pneumatic intensive sound source

作　　者：张世功[1] 周红生[1] 时海波[2] 叶天明[3] 杨长庚[1] 刘逍逸[1] 

机构地区：[1]中国科学院声学研究所东海研究站,上海200032 [2]上海交通大学附属第六人民医院耳鼻咽喉科,上海200233 [3]同济大学声学研究所,上海200092

出　　处：《声学技术》2016年第1期1-5,共5页Technical Acoustics

摘　　要：为实现强声的气动发声,设计了一种基于喷注型和谐振型组合的复合式气动声源,仅对喷注型声源进行了详细研究。利用高压气体对声源的气室充气,形成高压气体腔室,接通牵引电磁铁电路,电磁铁带动连动轴和堵头使高压气体高速喷出,高速气流在谐振管内形成湍流,从而产生强声。仿真结果显示了湍流的产生,并可得到168 d B的强声。利用B&K 3560 Pulse多分析系统对自制的气动声源进行测试,结果显示:在距离出气口10 cm处,声压级可达146 d B,这样可推导出在距离出气口1 cm处,声压级可超过164 d B,测量结果与仿真结果较为接近。最后,对非线性声波形成的激波进行了分析。研制的强声气动声源可用作动物实验的声源。A kind of composite pneumatic sound source based on jet and resonant model is designed in order to obtain intensive sound. This paper just concentrates on the jet model source. Compressed gas is injected into high pressure chamber, when switching on the electric circuit, the electromagnet pulls the cap, the high pressure gas spouts from the exit. The high velocity airflow can form turbulence and the intensive sound can be generated. Numerical simulation shows that the turbulence exists and the sound of 168 d B（Sound Pressure Level, SPL） can be obtained. The experiment is conducted with the self-designed pneumatic sound source. The measurement with multi-function system（Denmark, BK 3560 Pulse） result shows that the sound SPL can reach 146 d B at the position of 10 cm from the sound source. It can be deduced that the SPL measured at the position of 1 cm from the sound pressure level will be greater than 164 d B. The experimental result is close to the simulation result. Finally, the shock wave and the distortion wave are analyzed in the paper. The pneumatic sound source can be used to test some effects of animals.

关 键 词：气动声源 湍流 激波 

分 类 号：O422.7[理学—声学]