声学技术
聲學技術
성학기술
Technical Acousitics
2010年
1期
32-36
,共5页
小波分解%FIR滤波%Morlet小波%调制谱%轴频
小波分解%FIR濾波%Morlet小波%調製譜%軸頻
소파분해%FIR려파%Morlet소파%조제보%축빈
multi-resolution wavelet decomposition%FIR filter%Morlet wavelet%modulation spectrum%shaft frequency
分析小波多分辨率分解方法引起的频率混叠的问题,提出了直接采用窄带FIR滤波的方法提取感兴趣的数据,然后利用Morlet复解析小波变换方法提取螺旋桨轴频.通过设置合适的中心频率和带宽,提取调制信号的包络,对包络信号进行谱分析,提取螺旋桨的轴频等信息,对于推算目标速度具有重要价值.
分析小波多分辨率分解方法引起的頻率混疊的問題,提齣瞭直接採用窄帶FIR濾波的方法提取感興趣的數據,然後利用Morlet複解析小波變換方法提取螺鏇槳軸頻.通過設置閤適的中心頻率和帶寬,提取調製信號的包絡,對包絡信號進行譜分析,提取螺鏇槳的軸頻等信息,對于推算目標速度具有重要價值.
분석소파다분변솔분해방법인기적빈솔혼첩적문제,제출료직접채용착대FIR려파적방법제취감흥취적수거,연후이용Morlet복해석소파변환방법제취라선장축빈.통과설치합괄적중심빈솔화대관,제취조제신호적포락,대포락신호진행보분석,제취라선장적축빈등신식,대우추산목표속도구유중요개치.
The limitation of frequency overlap existing in multi-resolution wavelet decomposition is anaIyzed.And a narrowband FIR filter method directly to extract interested data is proposed.By using Morlet complex resolution wavelet transform and setting appropriate band and center frequency the envelope of modulated signal is extracted and then analyzed with frequency spectrum method.finally the screw propeller shaft frequency, which is the important value for object speed calculation,can be obtained.
