A Novel Vibration Exciting Method for NC Machine Tools

Considering that NC machine tools are difficult to be excited, a novel method of executing the self-exciting of structural vibration by applying a machine tool movement, which is proved to be effective by machine tool testing, is presented in the proposed study. The influence of movement parameters on the vibration response is studied by testing the designed movement under different parameters and comparing the characteristics of vibration response signals in the time and frequency domains. The proposed method is validated by comparison of the testing frequencies and those of experimental modal analysis (EMA). As this method does not need additional vibration-excitation equipment, it is suitable for online testing and analyses of NC machine tools, especially for heavy-duty machine tools. The latter ones are difficult, even impossible, to be excited.