小波包分析法在提高冲击试验波形测量准确度中的应用  

Application of WPT Method for Improving the Measurement Precision of Impulse Current Waveform

作　　者：袁海燕[1] 傅正财[1] 陈勇斌[2] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]浙江省嘉兴市气象局,浙江嘉兴314050

出　　处：《上海交通大学学报》2010年第7期935-939,共5页Journal of Shanghai Jiaotong University

基　　金：上海市浦江人才计划资助项目(08PJ14316)

摘　　要：将小波包分析法(WPT)引入冲击试验测量波形的消噪处理.分别用傅里叶变换法、曲线拟合法、小波分析法和WPT对同一种含噪声波形进行消噪,计算了消噪后的波形参数.分析表明,噪声频率对消噪效果没有影响,曲线拟合法消噪的波形参数误差最大,WPT消噪的误差最小,而且对波前时间的影响不大,幅值基本与标准波形相同.通过对实际测量波形的消噪效果分析,验证了WPT的高效性和实用性.The wavelet packet transform（WPT） method was proposed to de-noise for the measured wave in the impulse current test.The four de-noising methods,including the WPT method,the Fourier transform,the curve fitting and the wavelet transform method,were used to de-noise for the same waveform with noise.Also,the de-noised waveform parameters were calculated.The research indicates that the noise frequency has no impact on the de-noising results.The error of waveform parameters de-noised with WPT is the least.The influence on the wave front is little and the magnitude of de-noised wave is almost the same with the standard wave.On the contrary,the error of de-noised wave with curve fitting is the maximal.The investigation on the measured wave verifies that WPT is the most precise and practical method.

关 键 词：冲击试验 测量 波形 消噪 小波包变换 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]