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应用科学学报 ›› 2005, Vol. 23 ›› Issue (4): 389-392.

• 论文 • 上一篇    下一篇

脉动流条件下涡街信号瞬时频率的估计

黄云志, 徐科军   

  1. 合肥工业大学自动化研究所, 安徽合肥 230009
  • 收稿日期:2004-04-04 修回日期:2004-12-24 出版日期:2005-07-31 发布日期:2005-07-31
  • 作者简介:黄云志(1976-),女,安徽凤台人,硕士,讲师,E-mail:hqyz@hfuf.edu.cn;徐科军(1956-),男,江苏无锡人,教授,博导,E-mail:dsplab@hfut.edu.cn
  • 基金资助:
    合肥市科研计划项目(2004-1012)

Estimating Instantaneous Frequency of Vortex Signal in Pulsing Flow

HUANG Yun-zhi, XU Ke-jun   

  1. Institute of Automation, Hefei University of Technology, Hefei 230009, China
  • Received:2004-04-04 Revised:2004-12-24 Online:2005-07-31 Published:2005-07-31

PDF

95

被引次数

7

摘要： 研究脉动流条件下涡街信号的模型,提出频率测量的新方法.利用基于ⅡR滤波器组的小波变换,对信号进行二进制分解.根据实时性要求,提出基于ⅡR滤波器组的递归小波分解算法.对分解后的涡街信号进行Hilbert变换,估计出瞬时频率.仿真结果表明,该方法计算精度高、实时性好,可以准确反映脉动流条件下涡街信号的频率特征.

关键词: 涡街信号, 滤波器组, 脉动流, 递归小波算法, 瞬时频率

Abstract: A model of vortex signal in the state of pulsing flow is studied, and a new frequency measuring technique is proposed.Wavelet transform based on ⅡR filter banks is used to decompose vortex signals.A recursive wavelet algorithm using ⅡR filter banks is adopted to meet the requirement of real-time processing. The decomposed vortex signal is processed with Hilbert transform, and the instantaneous frequency (IF) is then estimated.Simulation results show that the proposed method provides satisfactory accuracy and real-time characteristic, therefore can be used to effectively process vortex signals in pulsing flow.

Key words: vortex signal, pulsing flow, filter bank, instantaneous frequency, recursive wavelet algorithm

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