次声实验系统及其声学性能分析

为了从环境保护和劳动卫生学的角度研究次声对人的影响 ,本研究基于亥姆霍兹谐振器的基本原理研制了一个次声试验系统。该系统由亥姆霍兹谐振器、电声驱动部分和测控分析部分组成 ,通过对该系统的声学性能进行测试和分析 ,确定了系统所能发出的次声频率和次声级范围 ,讨论了系统发出次声时所产生的高次谐波对系统性能的影响及系统的频响特性 ,检验了谐振腔内部次声场空间分布的均匀性 ,结果表明该系统的声学性能是令人满意的 ,能够满足研究次声及其对人影响的实验要求。

AN INFRASOUND EXPERIMENT SYSTEM AND ITS ACOUSTIC PERFORMANCE ANALYSIS

In order ot study the effects of infrasound on human beings from the viewpoint of labor hygiene and environmental protection, an infrasound experiment system has been developed based on the fundamental principle of Helmholtz resonator. The system consists of a Helmholtz resonator, the electro-acoustic driving systems, measur- ing and controling analytic systems. Some measurements are carried out to evaluate the acoustic performance of the system in the infrasonic frequency range. It is determined that the system can reproduce the infrasonic frequency and sound pressure level range. When the system reproduces infrasound with the loudspeakers, influence of generating the higher harmonies on system performance and frequency response characteristic of the system are discussed. Spatial distribution uniformity of sound pressure level in resonating cavity is analyzed. The results indicate that the acoustic performance of the infrasound experiment system is satisfactory. It can Be used for studying the effects of infrasound on human Beings.