流体管道压力信号的高精度实时滤波方法

针对流体管道压力数据的特征，设计了管道泄漏实时高精度检测与定位的压力信号采集方法；在此基础上基于对压力信号的分析，设计了一种压力数据高精度实时组合滤波方法，分别应用低通滤波、陷波滤波和小波滤波对压力信号进行实时滤波处理，并给出了滤波方法中每个步骤的选择依据，以及参数选择方法.该滤波方法在滤掉压力信号中噪声的同时，较好地保留了压力变化的幅值和相位信息，从而有效提高泄漏定位精度.通过流体管道试验仿真系统和实际管道数据的仿真验证和试验，证明了该滤波方法的有效性.

A High Accurate and Real Time Filter Method for Pressure Signal of Fluid Pipeline

A sampling frequency was designed according to the analysis of pressure signal for the purpose of leak detection of fluid pipeline. A united filter method including low-pass filter, notch filter and wavelet filter was proposed, and then the detailed implementary steps and parameters of the united filters were given. The united filters could filter the noise in pressure signal and recover the amplitude and phase of abnormal pressure which could improve the accuracy of leak detection effectively. At last, two cases were used to verify the united filters, and the results showed that the proposed filter method is effective.