摘要
为了准确获得电站锅炉声学测温中的时延估计,针对传统方法在冷态情况下混响使得测量结果存在多处伪峰值,影响时延估计准确性的问题,提出了一种基于二次相关的相位变换加权(PHAT-β)算法。在实验炉膛和某300 MW机组的测温实验台上进行了实验研究,并将二次相关PHAT-β算法与传统方法进行了对比。结果表明:二次相关PHAT-β算法能准确获得声波的飞渡时间,同时能较好地抑制混响,在锅炉强噪声环境中仍具有较好的适用性,为声学测温时延估计的优化提供了可行方法,同时也对基于时延估计的监测手段提供了新的算法。
To overcome the deficiency that pseudo peaks generally exist in traditional cold-state time delay estimation due to the presence of reverberation, a new algorithm of time delay estimation was proposed based on second correlation and phase transform weighting （PHAT-β）, so as to improve the accuracy of time delay estimation in acoustic temperature measurement of power plant boilers. The algorithm proposed was then used for temperature measurement of a test furnace and a 300 MW power unit, and the measure- ment data were subsequently compared with that of traditional method. Results show that the PHAT βal- gorithm based on second correlation can accurately measure the time of flight of the acoustic wave, and can suppress the reverberation more efficiently, having a relatively good applicability in boiler environment with strong noise. The new algorithm provides a feasible approach for optimization of time delay estima- tion in temperature measurement, which may serve as a reference for other monitoring means based on time delay estimation.
作者
沈国清
杨杰栋
陈栋
刘伟龙
张世平
安连锁
SHEN Guoqing;YANG J iedong;CHEN Dong;LIU Weilong;ZHANG Shiping;AN Liansuo(MOE＇s Key Lab of Condition Monitoring and Control for Power Plant Equipment,North China Electric Power University,Beijing 102206,China;National Thermal Power Engineering Technology Research Center,North China Electric Power University,Beijing 102206,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2018年第8期617-623,共7页
Journal of Chinese Society of Power Engineering
基金
中央高校基本科研业务费专项资金资助项目(2017ZZD001)
关键词
声学测温
时延估计
二次相关
PHAT-β算法
acoustic temperature measurement
time delay estimation
second correlation
PHAT-βalgo-rithm
