新型小波阈值法在变频调速系统非健康信号消噪中的应用

研究变频调速方式下工况变化和供电电源的谐波成分对调速系统的振动信号、运行噪声、电流、电压等信号变化规律的影响，在D．LDonoho和I．M．Johnstone提出的多分辨分析小波阚值去噪方法的基础上，讨论了sqtwolog、rigrsure、heursure、minimaxi四种常见的阈值与新的阈值函数一能量元阀值确定方法在变频系统的信号去噪过程巾的效果。通过MATLAB试验仿真，结果表明新的阔值法可以彻底滤除信号中的噪声和无用的高频分量，尽可能地减少低频和有用高频信息的损失，有效地提高变频调速系统非健康诊断的精确性。

Application of New Wavelet Threshold in the Frequency Control System Signals for the Health Non-denoising Reduction

Based on much resolution analysis wavelet threshold de-noising method which put forward by D.L. Donoho and I. M. Johnstone, This paper introduces four familiar getting threshold methods of the wavelet de-noising, i.e. sqtwolog,rigrsure, heursure and minimaxi, are compared.. When in the signal appears the comparatively higher mode harmonic component, after uses sqtwolog and the minimaxi threshold value law goes chirp, the high frequency information loss is serious, but heursure and the rigrsure threshold val...