Experimental modality analysis of high speed motorized spindle

On the basis of modality analysis theory and adopting the single input/multiple output(SIMO) recognition method,a free modality test on the high speed motorized spindle has been carried out.The method of experiment was introduced,and the frequency response data of all measured points were gained.Let all the frequency response data be acted as a summarized frequency response function and to be combined with the concerned functions to make an analysis of the tested result,and the modality parameters(the inherent frequency,damping and vibration type) of this motorized spindle were picked up and its inherent characteristic were researched.The result of experiment showed that the fundamental frequency of the motorized spindle was under its first ordered inherent frequency and tallies with the basic requirement of the normal operation of motorized spindle.The effectiveness of this modality test was verified by the MAC value.