摘要
介绍了时频分析中的短时傅立叶变换和小波变换的基本概念和特性。对钢管缺陷的漏磁信号分别进行短时傅立叶变换和小波变换分析与处理,比较它们的优缺点,得出时频分析是解决钢管漏磁突变异常信号的一种有效方法,尤其小波分析方法在解决漏磁信号干扰剔除、数据压缩、特征提取方面更具优点。
Concepts and characteristics of short-time Fourier transform (STFT) and wavelet transform in time-frequency domains are described in this paper. They are used to make time-frequency analysis and processing of the magnetic leakage flux (MFL) signals from various flaws in steel pipes. Their advantages and disadvantages are proposed. The conclusion that time-frequency analysis method is effective in MFL signals is drawn. Particularly, wavelet-analysis is proved to be more effective for noise elimination, data compression, and characteristics selection.
出处
《机电设备》
2002年第2期16-20,共5页
Mechanical and Electrical Equipment
