Thank you everybody for your help. Now I can understand better the static couple method. Does anybody have an example done using this method? Please attach it if possible.

Thanks

I have an example.I do not know the method to attach the file(Excel or PDF)to this reply.So please let me know your e-mail address.
Thomas Purackal.

There is an excellent article in Proceedings 24 th annual meeting publication. This is available through the Vibration Instutite. The static couple method is needed to balance many overhung rotors. If the phase readings are 180 or close to 180 degrees apart, you probably need to install a couple shot. Without going into to much detail: On a Polar plot mark the amplitude an phase on the near ( Support) bearing. Measure and plot the amplitude an phase on the far bearing ( Drive side). Draw a line between the tips. Divide that line in half. This point is the static componnent. Usually if you install a correction weight in this location, you can proceed with a normal 2 plane balance.
Good Luck!

Cheddar-caveman:

Can I have a copy ofyour "bible by Schenck", pls.

My e-mail is aamartinezg@gmail.com

Thank you

Hi Thomas Purackal

my e-mail adress is rmerino@ideko.es

thank you

hello Cheddar-Caveman. may I also have a copy of your balancing bible by email, thank you Al.
my email is alprei@telus.net

Hi, we have 250 MW turbo-alternators which run just above the generator 2nd critical and so balance using only the couple component. Attached is a PDF of an example using this method and I will attach an Excel spreadsheet which calculates the components next post. Hope this helps.

MDE

Couple_balance.pdf (83 Kb, 25 downloads)

Excel Spreadsheet attached

STATDYN.XLS (8 Kb, 24 downloads)