| 一体化有源吸声终端实现及其在行波管测量中的应用 |
| |
| 引用本文： | 王晓琳,刘碧龙,杨军,刘经纬,王冉.一体化有源吸声终端实现及其在行波管测量中的应用[J].声学学报,2019,44(2):258-264. |
| |
| 作者姓名： | 王晓琳 刘碧龙 杨军 刘经纬 王冉 |
| |
| 作者单位： | 1. 中国科学院噪声与振动重点实验室 北京 100190; |
| |
| 基金项目： | 国家自然科学基金项目(11404368,11474307)资助国家重点研发计划课题项目(2016YFB1200503)国家重大项目(613247) |
| |
| 摘 要： | 提出了一种利用矢量水听器在声管中实现一体化有源吸声终端的方法。该吸声终端采用矢量水听器作为传感元件,以实现入射波和反射波的分离,克服了传统双水听器声波分离方法中传感器间距及测量频率的限制,显著拓宽了一体化有源吸声终端的低频吸声频段。由声管中水声材料的测试原理出发,重点分析了吸声终端中传感元件灵敏度误差对吸声终端性能的影响,并给出了反射、透射系数的修正方法。实验结果表明:该有源吸声终端在100~2000 Hz频段内吸声系数可以达到0.98以上,测量得到材料的声压反射系数、声压透射系数及理论计算基本一致。
|
| 关 键 词： | 有源吸声终端 矢量水听器 水声材料 吸声系数 |
| 收稿时间： | 2017-03-13 |
Utilizing vector hydrophones to achieve an active anechoic terminal in an acoustic tube |
| |
| Institution: | 1. Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190;2. University of Chinese Academy of Sciences, Beijing 100049;3. School of Mechanical Engineering, Qingdao University of Technology, Qingdao 266520 |
| |
| Abstract: | A new vector hydrophones based active absorbing terminal used for the anechoic terminal of impedance tube is presented in this paper. Based on this, the reflected and the incident waves can be separated, and hence the absorbing spectrum can be achieved in a wider low-frequency band. The method overcomes the limit of frequency and size by using the traditional two-hydrophone method. The effect of hydrophone sensitivity on the terminal's absorbing performance is evaluated, and a correction method of reflection and transmission coefficients is also provided. Experimental results show that the absorbing coefficient in the frequency band of 100~2000 Hz is over 0.98, which is agree well with the theoretical results. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《声学学报》浏览原始摘要信息 |
| 点击此处可从《声学学报》下载免费的PDF全文 |
|
