On-Line Monitoring Shaft Misalignment of Feed Drive Systems Based on Time-Domain Shaft Rotating Holospectrum

Detection of early-stage misalignment the ball screw in feed drive systems is topic addressed this study. The triaxial vibration amplitudes and phases a rotating at nut were extracted using Vold–Kalman filtering order tracking (VKFOT). locus rotation speed its multiplier time domain then constructed to obtain corresponding holospectra. By self-organizing map, features various holospectra quantified into metrices as measure signifying severity misalignment. Experimental results indicated that proposed method effectively detected even though was less than 30 μm size. experiments conducted study demonstrated high sensitivity effectiveness method, which also has clear advantage due simpler instrumentation compared with traditional accelerometry.