上海交通大学学报

上海交通大学学报（自然版）

• 自动化技术、计算机技术 • 上一篇    下一篇

小波包分析法在提高冲击试验波形测量准确度中的应用

袁海燕1，傅正财1，陈勇斌2   

  1. （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）
  • 收稿日期:2009-09-09 修回日期:1900-01-01 出版日期:2010-07-28 发布日期:2010-07-28

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

YUAN Haiyan1,FU Zhengcai1CHEN Yongbin2   

  1. (1. School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Jiaxing Meteorological Bureau of Zhengjiang Province, Jiaxing 314050, China)
  • Received:2009-09-09 Revised:1900-01-01 Online:2010-07-28 Published:2010-07-28

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.

关键词: 冲击试验, 测量, 波形, 消噪, 小波包变换

Abstract: 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.

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