流体机械2024，Vol.52Issue(4)：1-6,27,7.DOI:10.3969/j.issn.1005-0329.2024.04.001
微速差双转子信号分离方法精度研究
Research on the accuracy of micro-speed difference dual-rotor signal separation method
摘要
Abstract
The separation of micro-speed difference signals within differential frequency 1 Hz is a challenge in the field of dual-rotor vibration feature extraction.Zoom-FFT(ZFFT)is a classical algorithm for extracting the features of signals with similar frequencies.However,it needs sufficient data length to achieve a good signal separation effect.In order to improve the signal frequency resolution without increasing the data length,the ZFFT+FT algorithm is generated on the basis of ZFFT algorithm.The extraction accuracy of the algorithm for micro-speed difference signals with frequency difference of 1 Hz and 0.5 Hz was studied through LabVIEW software simulation experiments,and compared with that of chirp Z transform(CZT),ZFFT and FFT algorithms.The extraction accuracy was measured by the relative error and variance of the extraction results.Field experiments were carried out in the coaxial micro-speed difference dual-rotor test stand,and the extraction results of 28s dataset of micro-speed difference signal by FFT were compared with those of 4s dataset extracted by CZT,ZFFT and ZFFT+FT algorithms.The maximum error between ZFFT+FT algorithm and FFT algorithm is 0.56 μm,which verifies the real-time performance and accuracy of ZFFT+FT.The results indicate that the ZFFT+FT algorithm can accurately extract the micro-speed difference signals within frequency difference of 1 Hz in real time.The research results can provide reference for the extraction of micro-speed difference signals in rotating machinery.关键词
微速差/双转子/Zoom-FFT/ZFFT+FTKey words
micro-speed difference/dual-rotor/Zoom-FFT/ZFFT+FT分类
机械制造引用本文复制引用
张梦,潘鑫,高金吉,卢加乔,马威龙..微速差双转子信号分离方法精度研究[J].流体机械,2024,52(4):1-6,27,7.基金项目
国家自然科学基金面上项目(51875031) （51875031）
北京市自然科学基金面上项目(3212010) （3212010）
