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基于时延估计法的泄漏噪声定位试验研究
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Investigation on Location of Leakage Noise Based on Time Delay Estimation Method
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    针对电站锅炉炉管泄漏问题,对基于时延估计法的定位方法进行了试验研究.通过外放高频声音信号模拟炉管泄漏信号,采用互相关算法估计两两通道间的时延值,根据距离公式建立定位方程,采用牛顿迭代法对其求解,获得泄漏点位置.试验结果表明:当声源为脉冲信号时,时延估计值很准确,当声源为连续周期声源信号时,时延估计值最大在-T/2~T/2(声源信号的周期)范围内变化;在一定范围内,采样率越高,时延值精度越高,定位效果越好;相较于声速,采样率对定位结果的影响更大.

    Abstract:

    Aiming at the leakage problem of boiler tubes in power plants,the location method based on time delay estimation was studied. The leakage signal of the furnace tube was simulated by the external high-frequency sound signal,and the multi group delay value was measured by the cross-correlation algorithm. The location equation was established according to the distance formula,and then solved by Newton iterative method,by which the leakage point coordinate was obtained. The experimental results show that the time-delay is effective only for impulsive sound source signals,and when it is the continuous periodic source,the estimation of time-delay is in the range of -T/2~T/2 (where T is the period of the source signal). In a certain range,the higher sampling rate results in the higher delay value precision and the better effect of location;when compared with the sound speed,the sampling rate has greater impact on the location results.

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刘志强?覮,黄霄,廖伊丹,彭小兰,张建智,谢伟.基于时延估计法的泄漏噪声定位试验研究[J].湖南大学学报:自然科学版,2019,46(4):102~109

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  • 在线发布日期: 2019-04-23
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