Electrical and mechanical run out

Dear all

My question is how can measure mechanical and electrical run out of the in-service machine equipped to the proximity sensor and how much allowable value for them? 

Any help will be appreciated 

Best regards

 

 

Original Post

Aziz,

 

Can you collect Bode plots for the area on concern as the machine rampa down?

Usually the overall amplitude at a relatively low speed (200-700 rpm) should give a reasonable estimate of the combined runout (electrical and mechanical).

Regards- Ali M. Al-Shurafa

Shurafa posted:

Aziz,

 

Can you collect Bode plots for the area on concern as the machine rampa down?

Usually the overall amplitude at a relatively low speed (200-700 rpm) should give a reasonable estimate of the combined runout (electrical and mechanical).

Regards- Ali M. Al-Shurafa

Dear all

That's right .you mean max amplitude at this rang (  700-200)when it coast down is total run out.so I should abstract this value from overall amplitude vibration at operating speed.

Thanks for the helpful advice.

aziz58 posted:
Shurafa posted:
 

Dear all

That's right .you mean max amplitude at this rang (  700-200)when it coast down is total run out.so I should abstract this value from overall amplitude vibration at operating speed.

Thanks for the helpful advice.

You actually should be subtracting the desired vector (1X, 2X, etc.), note I said vector so we have amplitude and phase to be subtracted from the full speed vector.  If you desire to do what is called waveform compensation, which involves far more than a vector subtraction then you need a software product designed for that purpose.  Something like BN/GE Adre and System 1 for instance.

John from PA posted:
aziz58 posted:
Shurafa posted:
 

Dear all

That's right .you mean max amplitude at this rang (  700-200)when it coast down is total run out.so I should abstract this value from overall amplitude vibration at operating speed.

Thanks for the helpful advice.

You actually should be subtracting the desired vector (1X, 2X, etc.), note I said vector so we have amplitude and phase to be subtracted from the full speed vector.  If you desire to do what is called waveform compensation, which involves far more than a vector subtraction then you need a software product designed for that purpose.  Something like BN/GE Adre and System 1 for instance.

Dear John

Thank you very much .we have ge frame 5 and 6 gas turbine that connected to bently Nevada rack. About waveform compensation where can I find it?

Do you have real case study ?

Beat regards.

aziz58 posted:

Dear John

Thank you very much .we have ge frame 5 and 6 gas turbine that connected to bently Nevada rack. About waveform compensation where can I find it?

Do you have real case study ?

Beat regards.

What do you have other than the rack?  Waveform compensation requires dedicated software for the task.

You may want to review the content at https://www.gemeasurement.com/...ots-part-1-final.pdf and https://www.gemeasurement.com/...ots-part-2-final.pdf.  Specifically see Figures 21A and 21B.

Other resources include https://www.maintenance.org/fi...04/3q2005_runout.pdf and https://www.oilandgaseng.com/f...Roll_Runout_Rev1.pdf

 

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