This modeling capability provides a systematic means of avoiding chatter during a finishing operation. Machining is known to be most stable when the cutter excitation frequency becomes close to the dominant natural frequency of the underlying structural system. Based on the low frequency undulation frequency which exists when the cutter excitation frequency nears the natural frequency, the change in the system natural frequency can be accurately detected and chatter control can be accomplished. The uniqueness of this approach is that it needs only a low bandwidth force transducer and it is very simple to implement. Experimental modeling procedure of structural dynamics Chatter during machining is related to the dynamics of the structure.
Many structural elements exhibit non-linear behavior.
In order to model such non-linearity, a new experimental modal analysis procedure using complex modal angle has been developed. In addition, procedures for estimating joint stiffness and damping parameters have been developed, with which the system dynamic response, in conjunction with a finite element model, can be predicted and used for chatter analysis. See the related section on taper joint parameter identification . Return to the High Speed Machining Lab.