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基于复调制ZOOM-FFT算法下阻尼比识别的研究
引用本文:程兆刚,唐力伟,张淑琴,曹洪娜. 基于复调制ZOOM-FFT算法下阻尼比识别的研究[J]. 计算机与数字工程, 2012, 40(1): 34-36
作者姓名:程兆刚  唐力伟  张淑琴  曹洪娜
作者单位:1. 军械工程学院基础部 石家庄050003
2. 军械工程学院火炮工程系 石家庄050003
摘    要:利用半功率带宽法识别系统的阻尼比是一种简单、常用的方法,但精度受到作图准确性及人员判读的经验所制约,严重时甚至不能准确拾取出半功率点。该文提出识别阻尼比的一种方法:细化-半功率带宽法,采用FFT变换对全谱进行识别,确定谱峰,利用复调制ZOOM-FFT算法对感兴趣谱峰处进行局部细化,最后结合半功率带宽法可有效提高阻尼比的识别精度。

关 键 词:阻尼比  半功率带宽法  复调制ZOOM-FFT算法

Identification of Damping Ratio Based on Complex Modulation ZOOM-FFT
CHENG Zhaogang , TANG Liwei , ZHANG Shuqing , CAO Hongna. Identification of Damping Ratio Based on Complex Modulation ZOOM-FFT[J]. Computer and Digital Engineering, 2012, 40(1): 34-36
Authors:CHENG Zhaogang    TANG Liwei    ZHANG Shuqing    CAO Hongna
Affiliation:1.Basic Courses Department,Ordnance Engineering College,Shijiazhuang 050003)(2.Artillery Engineering Department,Ordnance Engineering College,Shijiazhuang 050003)
Abstract:Identify damping ratio of the system by using half-power bandwidth method is always a simple method,but its' precision is confined by the veracity of plotting and the operator's reading experience,even sometimes can not pick up the half-power point.This paper put forward a new method named zoom-half-power bandwidth method,which adopted FFT in identifying the spectrum peak in whole,then used ZOOM-FFT to zoom in the interested spectrum peak,at last combined with half-power bandwidth method in identifying damping ratio what can improve the precision.
Keywords:damping ratio  half-power bandwidth method  complex modulation ZOOM-FFT
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