To this end , the time - base diagram , orbit and fft are used to evaluate the vibration signals measured on the machine . only under necessary condition is the balancing of a rotor carried out 為此,我們采用了時(shí)域分析、軸心軌跡和頻譜分析( fft )等方法,對(duì)轉(zhuǎn)子上測(cè)得的振動(dòng)信號(hào)進(jìn)行處理、分析。