CAJ | 학술논문

电站锅炉内强背景噪声和炉膛、管道壁面的反射干扰，使声传感器阵列接收到的承压管泄漏声压信号的广义相关函数峰值模糊，甚至无法获得稳定的估计峰值，从而无法精确定位泄漏源位置。采用声场设计软件EASE构建了600MW超临界锅炉模型，对泄漏声线的传播、衰减等进行追踪，计算出泄漏信噪比；采用系统冲击响应平方反向积分法与Sabine方法对炉膛混响时间进行计算；通过数值实验评估了相位变换（phase transformation，PHAT）、极大似然（maximumlikelihood，ML）及改进的噪声条件下的相位变换（phasetransformfornoise，PTN）以及选择（SWITCH）算法的时间延迟估计性能。结果表明：在强背景噪声和混响存在情况下，SWITCH和PTN算法具有优越性。PTN性能略优于SWITCH算法，但需要泄漏混响与直达声能量比的先验知识，并且需要触发频点检测。
전참과로내강배경조성화로당、관도벽면적반사간우，사성전감기진렬접수도적승압관설루성압신호적엄의상관함수봉치모호，심지무법획득은정적고계봉치，종이무법정학정위설루원위치。채용성장설계연건EASE구건료600MW초림계과로모형，대설루성선적전파、쇠감등진행추종，계산출설루신조비；채용계통충격향응평방반향적분법여Sabine방법대로당혼향시간진행계산；통과수치실험평고료상위변환（phase transformation，PHAT）、겁대사연（maximumlikelihood，ML）급개진적조성조건하적상위변환（phasetransformfornoise，PTN）이급선택（SWITCH）산법적시간연지고계성능。결과표명：재강배경조성화혼향존재정황하，SWITCH화PTN산법구유우월성。PTN성능략우우SWITCH산법，단수요설루혼향여직체성능량비적선험지식，병차수요촉발빈점검측。
The interference of strong background noise and reflected by the surface of wall and tube rows in industrial boiler furnace, renders the generalized cross-correlation （GCC） peaks of tube leak sound pressure signals received by sensors array ambiguous, even the stable peak couldn＇t be searched at all, which leads to leak position may fail to accurately be fixed. The 600MW supercritical boiler model was established, the leakage source propagation process of reflection and attenuation in boiler furnace was simulated by enhanced acoustic simulator for engineers （EASE）, the approximate signal to noise ratio （SNR） was obtained through it; The reverberation time was calculated with the modified Sabine and squared impulse response integration method by the simulation. The time delay estimation algorithm： phase transformation （PHAT）, maximum likelihood （ML）, phase transform for noise （PTN, derived from PHAT） and SWITCH were evaluated and results revealed the superiority of SWITCH and PTN methods in reverberant and noisy boiler background. Although SWITCH is outperformed by PTN slightly, but the prior knowledge of reverberant energy to direct energy ratio and frequencies onset detection is required in PTN method.