On-line Ball Screw Preload Degradation Monitoring Based on Vibration Signals

摘要

A novel technique for on-line monitoring ball screw preload degradation for ball screw feed drive systems is proposed. Simply attaching an accelerometer on the ball screw nut of a ball screw feed drive system in operation, the ball screw preload degradation is found to be correlated well with the actual ball pass order (ABPO), the vibration RMS amplitude at ABPO, the variance of vibration at ABPO and the dispersion of order spectra from the extracted vibration signal after processing using Angular Velocity Vold-Kalman Filtering Order Tracking (AV VKF-OT). Then a methodology in monitoring automatically the preload degradation for a ball screw feed drive system based on principal component analysis with these four parameters as the process variables is proposed and demonstrated experimentally.