基于小波变换的自适应滤波方法研究  

Research on Adaptive Filter Based on Wavelet Transform

作　　者：刘泽华[1] 谷立臣[2] 

机构地区：[1]中航工业第一飞机设计研究院,陕西西安710089 [2]西安建筑科技大学机电工程学院,陕西西安710055

出　　处：《微计算机信息》2010年第22期236-238,共3页Control & Automation

基　　金：基金申请人:谷立臣;项目名称:基于多源信息融合的液压动力系统监测;诊断及故障控制理论研究;基金颁发部门:国家自然科学基金委(50575168)

摘　　要：在飞机液压系统运行过程中,由于液压管道摩阻,周围介质扩散等影响,使得测得的压力与流量信号带有很大的噪声,当噪声频带很宽时,传统的自适应滤波器的参数设置比较困难,致使去噪效果不明显。为此,提出了一种基于小波变换的自适应滤波算法,该算法基于信号和噪声经小波变换后在不同尺度上有不同的特征,即先对信号进行小波多尺度分解,然后对分解后的各尺度信号分别选用不同的滤波参数,进行自适应滤波处理。利用该方法对飞机液压系统运行试验上采集的压力信号进行降噪处理。结果表明,该方法比普通的自适应滤波方法更能有效地消除信号中的噪声。When the aircraft hydraulic system is running there are great noises in the measured pressure and flow signal due to the diffusion of medium around pipeline and rub resistance.And it is difficult to set the parameters of the adaptive filter for the wide frequency of noise,certainly,thus resulting bad de-noising effect.Adaptive filter based on wavelet analysis,which is based on different characteristics of signal with noise in different wavelet scales,is introduced.At first wavelet analysis is used to divide signal and processed them separately by adaptive filter.The method is used to eliminate the noise in the pressure signal measured in the aircraft hydraulic system detection experiment.The result indicates that the method can eliminate the noise in the signal more effectively than the usual filter.

关 键 词：自适应滤波 小波分解 飞机液压系统 压力信号 

分 类 号：TN713[电子电信—电路与系统]