| 基于复调制ZOOM-FFT算法下阻尼比识别的研究 |
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| 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 |
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| 作者姓名： | 程兆刚 唐力伟 张淑琴 曹洪娜 |
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| 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 |
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| 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。
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| 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 |
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| 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 |
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| Authors: | CHENG Zhaogang TANG Liwei ZHANG Shuqing CAO Hongna |
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| Affiliation: | 1.Basic Courses Department,Ordnance Engineering College,Shijiazhuang 050003)(2.Artillery Engineering Department,Ordnance Engineering College,Shijiazhuang 050003) |
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| 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. |
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| Keywords: | damping ratio half-power bandwidth method complex modulation ZOOM-FFT |
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