电站锅炉声学监测中互相关时延估计影响因素研究  

Factors Influencing Cross-correlation Time Delay Estimation of Acoustic Measurement for Power Boilers

作　　者：安连锁[1] 张世平[1] 李庚生[1] 沈国清[1] 冯强[1] 邓喆[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《动力工程学报》2012年第2期112-117,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金项目(50976034);中央高校基本科研业务费专项资金(09QG43)

摘　　要：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.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.

关 键 词：互相关 时延估计 声源 混响 热态 

分 类 号：TK311[动力工程及工程热物理—热能工程]