多种噪声下输油管道应力波波达时刻的检测

从小波变换的多分辨率特性和B样条小波能进行信号突变点检测的特性出发，研究了针对输油管道中冲击应力波波达时刻的检测方法。利用小波变换对含有多种噪声的应力波信号进行了多分辨率的分解，提取了有用信号。利用B样条小波对提取的有用信号的突变点位置进行判断，根据应力波到达两相邻检测点的波达时刻计算冲击点的位置，实现盗油点的定位。通过实测数据分析，得出该方法在输油管道的防盗检测中是可行的。

Arrival Time Detection of Stress Wave With Multiple Noise for Oil Pipelines

By researches of multi resolution analysis of wavelet and a special wavelet function,e.g. B spline wavelet capable for signal regularity detection,an arrival time detection method of stress wave for oil pipelines is discussed in this paper. Through analyzing the signals containing multiple types of noise in different scales employing wavelet transform , the desired signals are obtained for signal regularity and arrival time detection using B spline wavelet. The stolen position is located through the two time of the stress wave reaching to the two adjacent transducers. Validated with the field-measured data, the methods are found practical for anti-stealing detection of oil pipelines.