摘要
针对电厂汽轮发电机组振动信号的噪声抑制问题,采用提升小波变换的方法构造小波。在讨论了提升小波变换基本原理及特点的基础上,根据信号的局部梯度大小对提升格式的更新算子U(Update)进行自适应设计。用此方法对电厂汽轮发电机组的振动信号进行消噪处理,并通过实例仿真证明了该方法的可行性和有效性,从而为汽轮发电机组振动信号的故障诊断提供有力依据。
The lifting wavelet transform is used to construct wavelet to de-noise the vibration signal of turbo generator units. According to the theory and characteristics of the lifting wavelet transform,the adaptive update operator is designed depending on the local gradient of the signal.This method is used to de-noise the vibration signal of turbo-generator units.The feasibility and validity are proved through example simulation,which provides support for fault diagnosis of vibration signals for turbo-generator units.
出处
《计算机工程与应用》
CSCD
北大核心
2007年第34期226-228,共3页
Computer Engineering and Applications
基金
国家自然科学基金(the National Natural Science Foundation of China under Grant No.60674076)
上海市教委优青后备基金( No.Z2006-78)。
关键词
梯度
自适应
提升小波
消噪
gradient
adaptive
lifting wavelet
de-noising
