Vibraciones
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Publicado: 15 de noviembre de 2012
David Stevens IEng - Vibration Analysis - Alignment Problems
Page 1 of 2
Misalignment
Angular Misalignment
Typical Spectrum
Phase Relationship
Angular Misalignment is characterisedby high axial vibration, 180° Out-of-phase across
the coupling. Typically will have high axial vibration with both 1x and 2x rpm. However, not
unusual for either 1x, 2x or 3x to dominate. Thesesymptoms may also indicate coupling
problems as well.
Parallel Misalignment
Typical Spectrum
Phase Relationship
Offset Misalignment has similar vibration symptoms to Angular, but showshigh radial
vibration which approaches 180° Out-of-phase across the coupling. 2x often larger than
1x, but its height relative to 1x is often dictated by coupling type and construction. When
eitherAngular or Radial Misalignment becomes sever, it can generate either high
amplitude peaks at much higher harmonics (4x - 8x) or even a whole series of high
frequency harmonics similar inappearance to mechanical looseness. Coupling
construction will often greatly influence the shape of the spectrum when misalignment is
severe.
Misaligned Bearing Cocked On Shaft
Typical SpectrumPhase Relationship
file://H:\Para Ordenar General\21. Predictivo\1. Vibraciones\Analisis Vibracional\Ana... 26/10/2011
David Stevens IEng - Vibration Analysis - Alignment Problems
Page 2of 2
Cocked Bearing will generate considerable axial vibration. Will cause twisting motion with
approximately 180° phase shift top to bottom and/or side to side as measured in the axialdirection of the same bearing housing. Attempts to align the coupling or balance the rotor
will not alleviate the problem. The bearing must be removed and correctly installed.
-::- This
site isdesigned and authored by David Stevens IEng MIIE(mech) F.I.Diag.E.
-::-
Copyright ©
file://H:\Para Ordenar General\21. Predictivo\1. Vibraciones\Analisis Vibracional\Ana... 26/10/2011
Page 1 of 2
Misalignment
Angular Misalignment
Typical Spectrum
Phase Relationship
Angular Misalignment is characterisedby high axial vibration, 180° Out-of-phase across
the coupling. Typically will have high axial vibration with both 1x and 2x rpm. However, not
unusual for either 1x, 2x or 3x to dominate. Thesesymptoms may also indicate coupling
problems as well.
Parallel Misalignment
Typical Spectrum
Phase Relationship
Offset Misalignment has similar vibration symptoms to Angular, but showshigh radial
vibration which approaches 180° Out-of-phase across the coupling. 2x often larger than
1x, but its height relative to 1x is often dictated by coupling type and construction. When
eitherAngular or Radial Misalignment becomes sever, it can generate either high
amplitude peaks at much higher harmonics (4x - 8x) or even a whole series of high
frequency harmonics similar inappearance to mechanical looseness. Coupling
construction will often greatly influence the shape of the spectrum when misalignment is
severe.
Misaligned Bearing Cocked On Shaft
Typical SpectrumPhase Relationship
file://H:\Para Ordenar General\21. Predictivo\1. Vibraciones\Analisis Vibracional\Ana... 26/10/2011
David Stevens IEng - Vibration Analysis - Alignment Problems
Page 2of 2
Cocked Bearing will generate considerable axial vibration. Will cause twisting motion with
approximately 180° phase shift top to bottom and/or side to side as measured in the axialdirection of the same bearing housing. Attempts to align the coupling or balance the rotor
will not alleviate the problem. The bearing must be removed and correctly installed.
-::- This
site isdesigned and authored by David Stevens IEng MIIE(mech) F.I.Diag.E.
-::-
Copyright ©
file://H:\Para Ordenar General\21. Predictivo\1. Vibraciones\Analisis Vibracional\Ana... 26/10/2011
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