Abstract. Dynamic characteristic of machine tool is an important factor which affects machining quality and machining efficiency. Traditional experimental modal analysis method requires the measured structure to be in a relatively static state. So the dynamic characteristics of machine tool structure cannot be measured in operating state. In this paper, an approach of exciting CNC machine tools based on worktable empty running excitation is proposed. The machine tool structure is excited by inertial force generated during the reciprocating motion of machine worktable. The motion of worktable is designed and the influencing factors of excitation are analyzed. The effect of feed speed and acceleration to excitation is analyzed through experiment. Compared to impact test in static state, the method is performed in running state. So it can reflect the dynamics of machine tools in operation accurately.
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