Vibration monitoring
Vibration monitoring
Outline of this part Vibration monitoring development Condition monitoring basic concept Vibration monitoring details onsite vibration monitoring sensors vibration monitoring example vibration monitoring process
Outline of this part • Vibration monitoring development • Condition monitoring basic concept • Vibration monitoring details onsite vibration monitoring sensors vibration monitoring example vibration monitoring process
Brief history Respect experienced person always!！l Traditionally Screw driver against ear. Surprisingly reliable-depends on skill and experience of individual. Develop instruments Initially simple vibration meters-read rms velocity. Later integration of accelerometer signal introduced rms estimates of acceleration,velocity,displacement Peak value crest factor. Experienced operators still identify incipient failures long before detected by basic meters
Brief history Respect experienced person always!!!
Brief history Development of FFT algorithm and afordable,portable, robust battery-powered FFT analysers made it possible to use much more of the information in the vibration signal and obtaining far more advanced and useful analyses. a0.03 bo.02 0.02 0.015 0.01 0.01 0.01 0.005 .0.02 .0.03 0 005 0.1 0.15 02 0.25 100 200 300 400 500 Time [s] Frequency [H2] Velocity Fourier spectrum of velocity
Brief history
Brief history Condition based vibration monitoring established as reliable and cost effective technique for monitoring and diagnosis of machine faults before irreversible damage occur 9情得
Brief history