摘要
利用小波变换处理随机振动信号,先随机振动信号进行小波分解,分解的层数根据需要的精度而定;再对各频域内的信号进行时域分段,分段数与各频段的中心频率成正比,以使时间分辨率与中心频率成正比;最后对分段后的数据求平均功率,并将各频段各时间段的数据合在一起,构成一个压缩后的时频分布。处理结果表明,小波变换处理方法能够充分反映随机振动信号的时频局域特性。
Use wavelet transformation to process the random vibration signal. At first, adopt wavelet transformation to process the random vibration signal and the analyzing level is confirmed by precision; then, carry out time zone segment for frequency zone signal, make sure the segment is directly proportional to the center frequency of frequency zone, therefore the time differentiate rate is directly proportional to the center frequency; at last, acquire the average rate of segment data, combine the data of all frequency and time zone and compose the compressed time frequency distributing. The results show that the wavelet transformation processing method can reflect the time frequency feature of random vibration signal.
出处
《兵工自动化》
2008年第8期78-79,83,共3页
Ordnance Industry Automation
关键词
随机振动
小波变换
时频分析
Random vibration
Wavelet transform
Time-frequency analysis
