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Sensors
Vibration monitoring as a diagnostic tool strain gauge rosette cable shielding Fy RMS highpass lowpass t=1.2ms AE sensor buffer 50kHz 250kHz amplifier 1☑I record process workpiece tool holder
Vibration monitoring as a diagnostic tool
Vibration monitoring as a diagnostic tool Machines generally do not break down without some form of warning The well known bathtub curve is a plot of vibration versus time for typical machines. Breakdown- Repair performed- Check intervals increased New machine Repair necessary Running-in Regular Normal preventative check interval maintenance Time
Vibration monitoring as a diagnostic tool
Time waveforms 600 300 0 -300 -600 0 16 32 48 64 80 Time(ms) FIGURE 10.36 Time-domain waveform of a faulty gearbox [10.23]
Vibration monitoring as a diagnostic tool 45 1S02372 28 1S010816 18 11.2 D RMS C 7 10Hz-1000Hz 45 C C B 2 C B Class I 15 kW motor 1.8 B Class Il 15-75 kW A 1.12- B Class lll Prime movers 0.71 rigid foundations A 0.45■ Class IV Pime movers A 0.28 soft foundations 0.18 class I class ll class Ill class IV
Vibration monitoring as a diagnostic tool