摘要
在大学物理实验中,关于声的实验较少,比较常见的实验是利用超声波的波动特性来测量声速,而对次声声源以及声场分布情况的研究少见.我们设计的"分立推挽气流激励式"次声发生器可作次声声源及相关声场测量的实验,能让学生了解次声波的特点、调制式气流次声发生器的换能机理和基本的声场测量方法.使用MATLAB对所测数据进行分析和处理,运用COMSOL对声场进行数值仿真,能让学生了解声场的分布和声源的指向性.从而拓宽学生的知识面、提高学生的实验能力以及数据处理和分析能力.
In college physics experiment, experiment on sound is less, more common is the use of the characteristics of ultrasonic wave to measure the sound velocity, and the study of infrasound source and the acoustic field distribution are rare. The ＂separation of push-pull flow modulation＂ infrasound generator we designed can do experiments of infrasound source and relevant acoustic field measurement, which can make students understand the characteristics of infrasound, the mechanism of energy conversion of the air-modulated infrasound source, and the basic method of sound field measurement. Using MATLAB to analyze the data measured in experiments and COMSOL to do sound field numerical simulation, can make the students know the distribution of sound field and directivity of the sound source. Thus which can broaden the students＇ knowledge, improve the students＇ ability of experiment and data processing and analysis.
出处
《大学物理》
北大核心
2016年第12期26-29,41,共5页
College Physics
关键词
分立推挽
次声
教学实验
separated push-pull
infrasound
instructional experiment
