激光诱导单空泡溃灭噪声频谱特性研究  

Spectrum Characteristics of Laser-Induced Single Bubble Collapse Noise

作　　者：张婷婷[1] 曹国翔 王彦佼 夏婷婷[1] 蔡强[1] 王攀达 李贝贝[1] 刘秀梅[1] 

机构地区：[1]中国矿业大学机电工程学院

出　　处：《激光与光电子学进展》2014年第3期135-140,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51209203;51005231);江苏省自然科学基金(BK2012131);中国矿业大学大学生实践创新训练计划(X1029012066);国家大学生创新性实验计划(201310290016);江苏省优势学科平台资助项目

摘　　要：采用压电陶瓷水听器对液体中激光诱导单空泡溃灭噪声进行了信号检测实验。描述了实验仪器实施配置方法,并编制了一款应用小波变换、快速傅里叶变换(FFT)等信号分析手段对测得的空化噪声信号进行小波降噪、功率谱分析的空化噪声分析软件。该软件试用表明,小波降噪技术应用于空化信号分析是一种有效的方法。设计的噪声分析软件能够快速直观地反映噪声信号的频谱特征,实现空化的在线检测和监测。研究结果对水轮机、螺旋桨等水利机械的空蚀预警及空化空蚀现象的研究和应用具有一定意义。The laser-induced cavitation bubble collapse noise spectrum in the liquid are studied experimentally by using a piezoelectric transducer （PTZ） hydrophone. Experimental methods and a cavitation detection system are designed to investigate bubble collapse noise. The wavelet transformation, fast Fourier transform （FFT） and other signal analysis methods are used to monitor the cavitation noise and reduce wavelet noise, analyze power spectrum. The result shows that application of wavelet denoising in cavitation bubble collapse noise spectrum analysis is an effective method. In addition, the designed software can quickly analyze the spectral characteristics of bubble noise signal, and it can detect and monitor cavitation on-line. The results have certain significance on the warning and researching of turbine cavitation, propeller cavitation and other water conservancy machineries.

关 键 词：激光技术 空化噪声 信号分析 小波变换 功率谱估计 

分 类 号：O434.14[机械工程—光学工程]