Active suppression of chatter in peripheral milling Part 1. A statistical indicator to evaluate the spindle speed modulation method

This work investigates the potential of employing the spindle speed modulation 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 suppression 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 experimental set-up for implementing spindle speed modulation are described. Different amplitude-frequency combinations of sinusoidal fluctuations were tested at 20% and 50% beyond the limit of stability both numerically and experimentally with steel workpieces. They showed higher vibration suppression with increased values of speed modulation parameters, which is a general trend that was also reported in other works conducted under different environments.