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
Condition monitoring entails continuous or periodic determination of the condition of a plant or machine component during operation or of a structural component while in service.This is in contrast to scheduled maintenance. Reduced maintenance cost. Increased running time between shut-downs. Increased availability of machinery.Avoids catastrophic failures. Reduced spare part stock holdings and improved safety. Identification of nature and origin of fault. Noise and vibration analysis one of several condition monitoring techniques(temperature,current and voltage,metallurgical,oil- analysis). Vibration as a diagnostic tool most widely applied
Why vibration monitoring? ALT ct ERT
Why vibration monitoring?
Onsite vibration monitoring AAAA
Onsite vibration monitoring
Vibration monitoring equipment Monitoring sometimes done under very difficult circumstances
Vibration monitoring equipment
Sensors ■PCB Accelerometers CHARGE ACCEE 352C41 D化C昌 PC會 SPCB
Sensors