中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2011年
20期
2446-2451
,共6页
故障诊断%双树复小波变换%轴承%幅值解调%信号处理
故障診斷%雙樹複小波變換%軸承%幅值解調%信號處理
고장진단%쌍수복소파변환%축승%폭치해조%신호처리
fault diagnosis%dual -- tree complex wavelet transform （DTCWT）%bearing%amplitudedemodulation%signal processing
提出了一种基于双树复小波变换解调技术的轴承故障诊断新方法。该方法利用双树复小波变换具有近似平移不变性、避免频率混叠和有效降噪的优点，首先对轴承故障振动信号进行双树复小波分解和重构，将振动信号分解成实部和虚部，然后计算振动信号的双树复小波幅值包络和包络谱。齿轮箱轴承故障振动实验信号的分析表明，该方法能在强噪声环境下准确提取轴承故障产生的周期性瞬态冲击信号，能有效消除频率混叠现象和强噪声的影响，能有效识别轴承内圈和外圈故障。
提齣瞭一種基于雙樹複小波變換解調技術的軸承故障診斷新方法。該方法利用雙樹複小波變換具有近似平移不變性、避免頻率混疊和有效降譟的優點，首先對軸承故障振動信號進行雙樹複小波分解和重構，將振動信號分解成實部和虛部，然後計算振動信號的雙樹複小波幅值包絡和包絡譜。齒輪箱軸承故障振動實驗信號的分析錶明，該方法能在彊譟聲環境下準確提取軸承故障產生的週期性瞬態遲擊信號，能有效消除頻率混疊現象和彊譟聲的影響，能有效識彆軸承內圈和外圈故障。
제출료일충기우쌍수복소파변환해조기술적축승고장진단신방법。해방법이용쌍수복소파변환구유근사평이불변성、피면빈솔혼첩화유효강조적우점，수선대축승고장진동신호진행쌍수복소파분해화중구，장진동신호분해성실부화허부，연후계산진동신호적쌍수복소파폭치포락화포락보。치륜상축승고장진동실험신호적분석표명，해방법능재강조성배경하준학제취축승고장산생적주기성순태충격신호，능유효소제빈솔혼첩현상화강조성적영향，능유효식별축승내권화외권고장。
A novel method of bearing fault diagnosis based on demodulation technique of DTCWT. It is demonstrated that the proposed dual-tree complex wavelet transform has better shift invariance, reduced frequency aliasing effect and de-noising ability. The bearing fault vibration signals were firstly decomposed and recostructed using dual-tree complex wavelet transform. Then the real and i maginary parts were obtained and the vibration signals were amplitude demodulated. In the end, the amplitude envelope and wavelet envelope spectrum were computed. Therefore, the characteristics of the bearing faults can be recognized according to the wavelet envelope spectrum. The experimental resuits show that fault diagnosis based on dual-tree complex wavelet transform can diagnose bearing faults effectively under strong noise conditions and reduce spectral aliasing.
