提出了一种利用小波包检测调速阀故障信号的方法。通过小波的小波包分析将信号按一定的尺度进行划分,不同频率的信号被划分到不同的频段中。由经过预处理的信号经过小波包分解与重构后,可以得到小波包重构图,由图中可以获得故障产生的时间点和频率,再对故障的严重程度进行了量化分析。实验结果表明用小波包理论进行故障检测是可行的。We propose the method of flow control valve fault diagnosis employing wavelet packet analysis.We can filter signals into different frequency band based on wavelet packet.According to the wavelet packet decomposition and reconstruction of preprocessed signal,we can get the wavelet packet reconstruction map,through which the time and frequency of the fault signal could be extracted as to measure the damage extent.The experiment results indicate it is feasible to carry out fault diagnosis using wavelet packet theory.2008福建省重大专项课题(2008HZ0201
