輸油管道次聲波法泄漏檢測與定位技術(shù)研究
[Abstract]:With the development of instrument technology, modern signal processing technology and computer technology, pipeline leak detection system based on signal is becoming more and more popular in recent years. Because infrasonic wave has the characteristics of low frequency, long wavelength, slow attenuation, and can be propagated in both gas and liquid, the pipeline leakage detection method based on infrasound signal has become one of the most accurate methods. By studying the principle of acoustic signal propagation in pipeline leakage, the leakage alarm model and leak location model are established. The signal characteristics of acoustic wave in time domain, frequency domain and time frequency domain are analyzed by means of de-mean method to pre-process the acoustic signals obtained under normal operation condition and leakage condition. The simulation results show that the accuracy of the cross-correlation method is higher than that of the adaptive minimum mean square error (MMSE) method in the estimation of noise interference and time delay. Compared with wavelet analysis and wavelet denoising, wavelet packet analysis can extract infrasound frequency signal more accurately. In this paper, two methods of time delay estimation are compared with wavelet transform theory. The experimental results show that the time delay estimation method based on wavelet packet analysis and cross-correlation analysis can improve the accuracy of leak location. By analyzing the influence factors of positioning accuracy, the error of fluid velocity has a great influence on the location accuracy of the final leak point. Finally, based on the Lab VIEW program development environment developed by National instrument (NI) Company, the main part of pipeline leak detection system is developed. The system has the advantages of wide practicability, convenient operation and high positioning accuracy. At the same time, the system can also be applied to other oil and gas pipeline leakage detection and location.
【學位授予單位】:西安石油大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TE973.6
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