ACTIVE SUPPRESSION OF CHATTER IN PERIPHERAL MILLING .1. A STATISTICALINDICATOR TO EVALUATE THE SPINDLE SPEED MODULATION METHOD

This work investigates the potential of employing the spindle speed mo dulation method for real-time control of chatter in peripheral milling . The first part of the study concentrates on developing a measurable chatter indicator which can quantify the relative vibration suppressio n properties of various speed modulation parameters. Experimental and simulation runs have shown that this indicator provides a well-behaved estimate of the relative cutting condition. The simulation and the ex perimental set-up for implementing spindle speed modulation are descri bed Different amplitude-frequency combinations of sinusoidal fluctuati ons were tested at 20% and 50% beyond the limit of stability both nume rically and experimentally with steel workpieces. They showed higher v ibration suppression with increased values of speed modulation paramet ers, which is a general trend that was also reported in other works co nducted under different environments.