CAJ | 학술논문

音波法泄漏检测技术用于输气管道泄漏检测具有灵敏度高、实时性强、定位精度高等优点，但是现阶段受困于信号滤波技术，难以在实际工程中推广应用。总结了现阶段主要的时频域滤波方法，重点介绍具有代表性的小波滤波和维纳滤波的滤波原理，利用实验室采集的泄漏音波信号验证了两种滤波方法的实际滤波效果。并且讨论了基于时域和频域滤波方法的不足，分析了针对某些工况，滤波方法不能取得良好滤波方法的原因。在此基础上，引入了近年来发展迅速的盲源分离技术，阐述盲源分离的原理，通过分离构造信号说明了盲源分离技术具有更好的适用性和更好的滤波效果，最后利用实验室采集的泄漏音波信号进行了实际分离，表明盲源分离技术具有实际的应用价值。
음파법설루검측기술용우수기관도설루검측구유령민도고、실시성강、정위정도고등우점，단시현계단수곤우신호려파기술，난이재실제공정중추엄응용。총결료현계단주요적시빈역려파방법，중점개소구유대표성적소파려파화유납려파적려파원리，이용실험실채집적설루음파신호험증료량충려파방법적실제려파효과。병차토론료기우시역화빈역려파방법적불족，분석료침대모사공황，려파방법불능취득량호려파방법적원인。재차기출상，인입료근년래발전신속적맹원분리기술，천술맹원분리적원리，통과분리구조신호설명료맹원분리기술구유경호적괄용성화경호적려파효과，최후이용실험실채집적설루음파신호진행료실제분리，표명맹원분리기술구유실제적응용개치。
In the natural gas pipeline leak detection field,acoustic leak detection technology has advantages of high sensitivity,strong real-time and high accuracy of leakage location.Such a technique is difficulty to be used widely due to no good signal filtering techniques.To solve the problem,the main filtering methods in time and frequency domains were summarized,the typical methods of wavelet and Wiener filtering were chosen,the principles of the two methods were listed,the actual filtering effects were studied.These filtering methods could not attain satisfying effects under some situations,the reasons were analyzed and the shortcomings of filtering methods were discussed.A rapidly developing method the blind source separation technique,was introduced,the principles of signal separation were presented.By separating structured signals,the blind source separation technique was proved to have better applicability and filtering effect.The separating results of leaky acoustic wave signals collected in Labs indicated that this technique is valuable for practical applications.