COMPUTER AIDED MILLING MACHINE MODAL ANALYSIS

摘要

The paper presents a time-domain modal analysis method with application to the identification of a milling machine structure. In a systematic modeling procedure, the model structure and the related parameters of each dynamic mode are identified in sequence. The relative vibration amplitudes are displayed in terms of animated mode shapes. The constructural weak points are pinpointed and the model refinement is made based on the modification of physical means. Results, as compared with those of finite element and fast Fourier transformation approaches, show the time-domain modal analysis method possesses the advantages of practicality and accuracy in dynamic data processing, and can be used as a powerful structure analysis tool, vital for various CAD/CAM applications including dynamic verification, model development and design refinement of components in flexible manufacturing cells.