CAJ | 학술논문

以理论和试验相结合的方法,对锅炉声学监测中的互相关时延估计法做了系统地研究,分别在试验和锅炉现场环境下,对影响互相关时延迟估计的因素进行了试验分析.结果表明：广义互相关时延估计法可以用于电站锅炉的声学监测;其准确性受到声源位置、声源指向性、声源声压级、炉膛混响和热态噪声等诸多因素的影响;PHATβ-加权可以很好地抑制混响;最大似然加权即ML加权具有很好的抗噪能力,可以用于热态时的声波飞渡时间测量;为声学法在锅炉监测中的成功应用提供了重要参考.
이이론화시험상결합적방법,대과로성학감측중적호상관시연고계법주료계통지연구,분별재시험화과로현장배경하,대영향호상관시연지고계적인소진행료시험분석.결과표명：엄의호상관시연고계법가이용우전참과로적성학감측;기준학성수도성원위치、성원지향성、성원성압급、로당혼향화열태조성등제다인소적영향;PHATβ-가권가이흔호지억제혼향;최대사연가권즉ML가권구유흔호적항조능력,가이용우열태시적성파비도시간측량;위성학법재과로감측중적성공응용제공료중요삼고.
In combination of theoretical analysis and experimental study,a systematic research was performed on cross-correlation time delay estimation of acoustic measurement for power boilers.Factors influencing the cross-correlation time delay estimation were analyzed under both experimental and actual boiler working conditions.Results indicate that the generalized cross correlation（GCC） time delay estimation（TDE） can be used for acoustic measurement of power boilers,of which the accuracy is determined by many factors,such as the position,directivity and SPL of sound source,the sound reverberation in furnace and the thermal noise of boiler,etc.The GCC-TDE method,which is weighted by PHAT-β,is able to suppress sound reverberation effectively;whereas the method based on ML with robust anti-noise ability may be used in hot-state environments.This may serve as a reference for further application of acoustic technology in monitoring and inspection of power boilers.