CAJ | 학술논문

由于频率分辨率较低,基带FFT难以有效地分析卧螺离心机拍振信号的频谱特征,为解决上述问题将选带细化频谱分析技术应用于拍振信号的分析.分析比较了两种常用细化方法:选带细化Zoom-FFT(ZFFT)和线性调频Z变换(CZT),指出了CZT算法的优越性.其中CZT法能在不增加采样点数的前提下,对感兴趣的频带进行细化,得到比较精确的频率值.对仿真信号和实际信号的分析表明,CZT在卧螺离心机拍振信号处理中有着极大的实际应用前景.
유우빈솔분변솔교저,기대FFT난이유효지분석와라리심궤박진신호적빈보특정,위해결상술문제장선대세화빈보분석기술응용우박진신호적분석.분석비교료량충상용세화방법:선대세화Zoom-FFT(ZFFT)화선성조빈Z변환(CZT),지출료CZT산법적우월성.기중CZT법능재불증가채양점수적전제하,대감흥취적빈대진행세화,득도비교정학적빈솔치.대방진신호화실제신호적분석표명,CZT재와라리심궤박진신호처리중유착겁대적실제응용전경.
Because of the low frequency resolution, it's difficult to effectively analyze the spectrum characteristics of beat vibration signal of the Horizontally Helix-centrifugal using FFT. This paper compares two often used zoom methods : ZFFT and CZT, points out the superiority of the CZT. CZT can zoom the interesting band and get a precise frequency without increasing the number of sampling points. The analysis of simulative signal and actual signal shows that CZT has a great application perspective in beat vibration signal processing of the Horizontally Helix-centrifugal.