Weitere ähnliche Inhalte Kürzlich hochgeladen (20) Imbalance Vibration-Spectra1. Static&Imbalance-
• Also%known%as%forced%imbalance%2
• Weight%distribution%axis%parallels%the%rotational%axis.2
• Occurs%when%a%heavy%spot%is%located%at%the%mid>point%between%the%bearings.%2
• More%common%in%rotors%that%are%short%compared%to%diameter.%2
2
Couple&Imbalance-
• 180°%out>of>phase%on%same%shaft2
• 1X%always%present%and%dominates%the%spectrum%2
• Amplitude%varies%with%square%speed.2
• Weight%distribution%axis%intersect%the%rotational%axis2
• Correction%requires%the%balance%weights%in%at%least%2%planes.%2
2
Dynamic&Imbalance-
• Also%known%as%quasi>static%imbalance%2
• Most%common%imbalance2
• Occurs%when%the%rotational%axis%and%the%weight%distribution%axis%do%not%intersect%at%all.%2
• A%combination%of%static%and%couple%imbalances%2
Overhung%Imbalance-
• 1X%radial%and%axial%vibrations2
• Radial%signals%are%because%of%bending%effects2
• Axial%readings%might%be%unsteady2
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Amplitude$$
1X:$$$Radial$
RPM$
Amplitude$$
1X:$$$Axial$&$Radial$
RPM$
Amplitude$$
1X:$$$Radial$
RPM$
Amplitude$$
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