摘要
为解决现有低频高声强发生器声压低、装置复杂、声学性能可调性与重复性差等问题,设计了以压缩空气为能源、电机调谐的低频射流高声强发生器。按照气体动力学一维行波理论、守恒方程、伯努利方程与声学理论对其进行声学设计。按理想可压缩气体定常流流体动力学控制方程模型,采用三维结构化网格、压力耦合方程半隐式算法,计算得到流场的压力分布特性。为验证其声学特性,进行了现场发声测试试验。实验结果与设计值基本一致,验证了该低频高声强发生器具有50 Hz低声频、181dB高声强、声特性重复可调的特点,可以为噪声伤害、高声强声源工业应用及声学武器的研究提供实验基础与声源。
To solve the problems of the fluidic low-frequency and high-intensity sound generator, such as lower sound pressure, more complex equipments, worse acoustic character tune and repetition, a new low-frequency and high-intensity sound generator is designed. The generator is powered by compressed air and adjusted by electromotor. It is acoustically designed by one-dimensional traveling-wave theory of aerodynamics, conservation equations, Bernoulli＇s equations and acoustic theory. Flow field＇s pressure distribution character is obtained by computation fluid dynamics （CFD） controlled equations model of ideal-compressible-gas steady flow, structure mesh, semi-implicit method for pressure-linked equations （SIMPLE） algorithm. To validate its acoustic character, an onsite sound generation test is experimented. The test results and design values are consistent, which verifies that this low-frequency and high-intensity generator has 50 Hz low frequency, 181 dB high intensity, repetitive and adjustable acoustic characteristics. The results offers test sound source for yawp hurt, high-intensity sound source industry appliance and acoustic weapons.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2009年第3期344-347,共4页
Journal of Nanjing University of Science and Technology
基金
南京理工大学科研发展基金(XKF05030)
关键词
声学发生器
射流
低频
高声强
气体动力学
acoustic generators
fluidics
low frequency
high intensity sound
gas dynamics
