小波变换理论在管道泄漏检测中的作用

分析了负压波泄漏定位方法的关键技术，提出了小波变换与负压波相结合的方法，利用信号奇异点与小波变换模极大值在多尺度上变化对应的性质，将离散小波变换应用到获取压力波信号序列特征奇异点中，可以对泄漏点进行定位。因为现场采集的数据中含有大量噪声，采取小波门限去除噪声干扰的方法，可以很好地消除噪声干扰。在实际应用中取得了良好的效果。

Application of the wavelet in the pipeline leakage detection

The crucial technologies in instantaneous negative pressure wave are analyzed in this article. The method about the combination of wavelet transform and negative pressure are introduced. Taking account of the corresponding characteristics of the signal singularity and wavelet transform module maximum in multi-scale changing, the discrete wavelet transform is applied to get the featured inflection point of negative pressure wave. Datas that scene gathers contain a large number of noises, so using wavelet valve method denoise interferes, has made a good result in practical application.