| 基于分段波形的信号瞬时频率计算方法 |
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| 引用本文： | 张亢,程军圣,杨宇,邹宪军.基于分段波形的信号瞬时频率计算方法[J].湖南大学学报(自然科学版),2011,38(11):54-59. |
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| 作者姓名： | 张亢 程军圣 杨宇 邹宪军 |
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| 作者单位： | 湖南大学 汽车车身先进设计制造国家重点实验室,湖南长沙,410082 |
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| 基金项目： | 国家自然科学基金资助项目(51075131); 湖南省自然科学基金资助项目(11JJ2026); 教育部长江学者与创新团队发展计划资助项目(531105050037); 湖南省科技计划应用基础研究资助项目(2010FJ3165) |
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| 摘 要： | 针对局部均值分解(Local Mean Decomposition,LMD)中乘积函数(Product Function,PF)分量的瞬时频率计算问题,引入了一种新的信号瞬时频率计算方法.该方法基于分段波形,先将信号分成若干个全波段(full wave),然后以一组递增的反正弦函数定义每个全波段的瞬时相位,进而得到信号...
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| 关 键 词： | 故障检测 局部均值分解 乘积函数 纯调频信号 瞬时频率 分段波形 |
A Piece-wise Based Signal Instantaneous Frequency Computing Method |
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| ZHANG Kang,CHENG Jun-sheng,YANG Yu,ZOU Xian-jun.A Piece-wise Based Signal Instantaneous Frequency Computing Method[J].Journal of Hunan University(Naturnal Science),2011,38(11):54-59. |
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| Authors: | ZHANG Kang CHENG Jun-sheng YANG Yu ZOU Xian-jun |
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| Institution: | ZHANG Kang,CHENG Jun-sheng,YANG Yu,ZOU Xian-jun (State key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan Univ,Changsha,Hunan 410082,China) |
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| Abstract: | To address the computing instantaneous frequency of the product function(PF) in local mean decomposition(LMD),a new instantaneous frequency of a signal computing method was introduced.This method is piece-wise wave based.Firstly,a signal was separated to a number of full waves.Then,the instantaneous phase of each full wave was defined by a set of monotonic increasing arcsine functions.Therefore,the instantaneous frequency of a signal was obtained.Theoretically,the instantanoues frequency obtained in this me... |
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| Keywords: | fault detection local mean decomposition product function pure frequency modulated signal instantaneous frequency piece-wise wave |
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