基于分数延时滤波的时域平均改进算法  

AN IMPROVED ALGORITHM FOR TIME DOMAIN AVERAGING BASED ON FRACTIONAL DELAY FILTERING

作　　者：邹今春[1,2] 瞿雷[1] 戴光昊[3] 王琇峰[1] 沈玉娣[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]中国电建集团西北勘测设计研究院有限公司,西安710065 [3]中国船舶重工集团公司第七○三研究所,哈尔滨150078

出　　处：《机械强度》2015年第5期793-799,共7页Journal of Mechanical Strength

基　　金：国家重大科技专项(2012ZX04012032)资助~~

摘　　要：为减小非整周期采样引入的截断误差对时域平均分析精度的影响,提出一种基于分数延时滤波的时域平均改进算法。在分析现有时域平均方法不足及分数延时滤波特性的基础上,方法利用现有的信号截断改进方法避免了截断误差累积并获得截断信号的延时因子,结合分数延时滤波实现对截断信号的重构与重采样,最后对各截断信号进行叠加后求算术平均。理论分析与实验结果表明:方法充分利用了分数延时滤波在改变延时因子方面的优势,明显减小了非整周期采样时信号截断误差,能有效提高无时标时域平均的分析精度。For reducing the influence of truncation error on the accuracy of time domain averaging （TDA） induced by non- integer-period sampling, an improved algorithm of TDA based on fractional delay filtering （FDF） is presented. On the basis of analyzing the disadvantages of current methods of TDA and the characteristics of FDF, a presently improved method of signal truncation was used in the method to avoid the accumulation of truncation error and obtain a delay factor on each of the truncated signals, the reconstruction and resample for the truncated signals were implemented with FDF, and finally the arithmetic mean were computed after all of the truncated signals were added. The theoretical analysis and experimental results demonstrate that the method which fully makes using of the advantages of FDF on the change of delay factor, apparently reduces the truncation error of signals with non-integer-period sampling, and could obviously improve the accuracy of TDA without key-phase signal.

关 键 词：分数延时滤波 时域平均 截断误差 无时标 

分 类 号：TH17[机械工程—机械制造及自动化]