Abstract: The leakage of pipelines may result in the economic loss and serious environmental pollution.On the basis of the negative pressure mean wave velocity method,a new iterative algorithm for leakage orientation of oil pipelines was proposed by analyzing the transmitting characteristics of pressure wave and the defect of traditional formula for leakage orientation of pipelines.The proposed new algorithm is helpful to improve the orientation precision.The wavelet transformation was used to cancel the noises in the negative pressure signals and capture the strange point.The fairly precise time difference was obtained.The simulation results showed that the orientation precision of the proposed algorithm was better than the traditional method.

Key words: transportation pipeline, pressure wave, leakage detection, leakage orientation, wavelet transform, signal processing

摘要： 对压力波在原油管道中的传播特性和传统负压波法泄漏点定位公式进行了分析,基于负压波平均波速的方法,提出了一种新的迭代定位算法.利用该算法对管道进行泄漏定位,提高了定位精度.利用小波变换在信号处理方面的优势,对负压波信号进行去噪处理,然后捕捉压力突变点.应用效果较好,得到较精确的时间差.仿真实例证明,新迭代算法的泄漏定位精度比传统方法有较大的提高.

关键词: 输油管道, 压力波, 泄漏检测, 泄漏定位, 小波变换, 信号处理