基于离散小波变换的气固两相流参数检测
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摘要
针对传统电容式传感器灵敏场分布不均匀的缺点,设计了双层螺旋电极电容式传感器,并且通过有限元仿真分析传感器结构参数对灵敏场分布的影响。对传统的相关时延估计算法进行了改进,提出了基于离散小波变换的相关时延算法,并将其应用到气固两相流速度测量当中,将两种算法测量结果进行了对比。实验证明,与传统的时延算法相比,基于离散小变换的相关时延算法具有更强的压制信号噪音能力,在低信噪比情况下也能准确进行时延估计。
Aiming at the disadvantage of the unevenly distributed sensitive field of the traditional capacitive sensor,the doubledeck spiral plate capacitive sensor was designed,and the structural parameters of sensor which impact the sensitive field distribution were analyzed through the finite element simulation. The related time delay algorithm based on discrete wavelet transform was proposed,which improved the traditional cross correlation algorithm. This method was applied to gas-solid two-phase flow rate measurement,and the measurement results were compared with the traditional. Compared with the traditional method of delay algorithm,results show that the correlation delay algorithm based on discrete wavelet transformation has a stronger ability to suppress signal noise. Therefore,this method can accurately estimates the time delay under low SNR.
引文
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