一种改进的小波包阈值去噪法在压缩机振动信号分析中的应用  

An Improved Wavelet Packet Threshold De-noising Method in Application of Compressor Vibration Signal Analysis

作　　者：刘涛[1] 李泽宇[1] 

机构地区：[1]兰州理工大学机电学院,甘肃兰州730050

出　　处：《机械与电子》2012年第3期13-16,共4页Machinery & Electronics

基　　金：国家自然科学基金资助项目(50965011);甘肃省自然科学基金资助项目(1014RJZA025)

摘　　要：结合变频涡旋压缩机振动小,噪声低的特点,利用一种改进阈值的小波包函数进行去噪处理,克服了硬阈值去噪不连续的缺点,同时还克服了软阈值函数去噪中的估计小波系数与分解小波系数之间存在着恒定偏差的缺陷。通过Matlab仿真分析比较了这3种去噪效果。An improved threshold of wavelet packet function is used to denoise with co, nsideration for small vibration and low level of noise in variable frequency scroll compressors. It overcomes discontinuous faults occurred in the hard threshold denoising. At the same time, it also overcomes the drawback that there is an invariable deviation between the estimated wavelet coefficients and the decomposed wavelet coefficients in the soft threshold denoising method. Furthermore,three kinds of denoising methods are compared through Matlab simulation analysis.

关 键 词：变频涡旋压缩机 振动信号 小波包分析 阈值函数 信噪比 均方根误差 

分 类 号：TN911.71[电子电信—通信与信息系统]