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Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 38702106, Entry date: 10/02/2009
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Cause of the vibrations

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QUESTION:

 

 

 

 

 

What are the causes of vibrations?


ANSWER / REMEDY / NOTES:

  

 

 

Vibrations can also be caused at the installation site by the complete drive unit.

For frequent causes, see the following table:

 

 

 
Vibrations

Design

manufacture/assembly

installation

Operational influences

Low-frequency vibrations

Rotor unbalance

Resonances

Unbalance

(wear)

Thermal growth

Foundation

fault

Misalignment

Blade pass

frequency

Unbalance

(coating)

Thermal

unbalance

Electrical faults

Hochfrequente Schwingungen

Roller bearing

natural

frequencies

Meshing

frequencies

Shortage of

lubrication

Roller bearing

damage

frequencies

Meshing fault

     

Based of the measured frequencies, the following causes of vibrations can be found:

Vibration cause

f  Rotor

2 x f 

Rotor

Various

frequencies

1 oder 2 x

line frequency

Unbalance

X      

Alignment error

distortions

X X    

Defective bearings

    X  

Asymetric field at

the stator and

rotor

      X

Gearbox fault

    X  

Resonances from

enclosure,

foundation

X   X  

 

 

 

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