APPLICATION OF VIBRATION SIGNAL MEASUREMENT FOR MONITORING GRINDING PARAMETERS

Vibration signal measurements are discussed for monitoring operating p arameters in a laboratory-scale ball mill. The vibration signal was fi rst picked up with an accelerometer, amplified by a vibrometer and the n transmitted to a DAT recorder during the entire testing period. The signal on the DAT recorder was resampled and converted into IBM compat ible personal computer readable data format using a digital oscillosco pe. The vibration signal analyses included rms estimation, power spect ral estimation, waterfall plot, principal component analysis and stepw ise multiple regression analysis. Clear differences in the rms and the spectra are found for different grinding conditions. Three principal components described about 95% of the total variation in the spectra. Each principal component was related mainly to one to three major freq uency bands. Close correlation was found between the vibration signal and grinding parameters. Therefore, an alternative method can be devel oped for monitoring the operating parameters in a ball mill.