Abstract
An accurate description of the machine tool dynamics is essential in machining process simulation, chatter avoidance, and model-based monitoring. However, the standard practice of experimental modal analysis of an idle machine tool does not always provide an accurate representation of its dynamics under operating conditions. This paper proposes a modified transmissibility function-based operational modal analysis (TOMA) that assumes consistent mode shape for the spindle assembly to monitor the changes in natural frequency and damping ratio of the spindle. The transmissibility function-based solution considers only the relative vibrations between two sensors mounted on the spindle housing while the machine is excited by the cutting forces during machining. Experimental application of the Mode Shape Compensated TOMA was successfully demonstrated in multiple milling tests.
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