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.%22

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.%22

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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1X:$$$Axial$&$Radial$

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1X:$$$Radial$

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