摘要
为有效抑制一种电磁流量计测量过程中产生的干扰,提高测量的精确度和稳定性,采用小波阈值去噪方法,将信噪比SNR和均方根误差RMSE作为去噪效果的评价指标,并按照小波阈值去噪的一般步骤,分析了小波基、阈值规则和变换尺度对去噪效果的影响。分析结果表明:小波基采用sym8、阈值规则采用强制去噪以及变换尺度为8时,该电磁流量计的输出信号去噪效果最好。
To effectively restrain the interference appearing in the process of measurement with new electromagnetic flow meter and enhance the accuracy and stability of the measurement,the wavelet threshold de-noising method is applied.SNR（signal noise ratio）and RMSE（root-mean-square error）are used as the indexes of noise elimination.The focus is put on the analysis of the effects of wavelet basis,threshold rule and transform scale on noise elimination.The result shows that when the wavelet basis uses Sym 8,and the threshold rule uses the forced noise suppression and the transform scale is 8,the de-noising quality is best.
出处
《海军工程大学学报》
CAS
北大核心
2015年第3期47-52,共6页
Journal of Naval University of Engineering
基金
国家自然科学基金资助项目(50677047)
湖北省科学条件专项基金资助项目(2013BEC010)
关键词
新型电磁流量计
小波去噪
小波基
阈值规则
变换尺度
new-type electromagnetic flowmeter
wavelet de-noising
wavelet basis
threshold rule
transform scale
