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Dynamic v Couple Unbalance

Dynamic v Couple Unbalance

Dynamic v Couple Unbalance

(OP)
If I know static imbalance in two different planes, I can calculate couple imbalance.  Dynamic imbalance is the "combination" of couple and static imbalance.  If I know static imbalance and couple imbalance, how do I calculate dynamic imbalance?

RE: Dynamic v Couple Unbalance

You speaking in terms of tires or wheels?  And why not just take the wheels/tires to a service center & see if they will check the balance for you using the appropriate equipment to reduce the possibility of error?

Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com

RE: Dynamic v Couple Unbalance

(OP)
I'm speaking in terms of DC motor armatures.  I just figured if anyone would know about balancing rotating machines, it would be wheel and tire guys.

RE: Dynamic v Couple Unbalance

You also need to know the cross coupled imbalance before you can work out the true state of affairs.

That is, you need three pieces of information

- the change in response (in phase and magnitude) at measuring plane 1 to a trial mass on plane A  call it R1A

and

R2B

and

R2A or R1B, but preferably both







  

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

RE: Dynamic v Couple Unbalance

Do you need to resolve the "static" and "couple" already derived by some measuring method ( probably using Greg's method) into appropriate left and right plane corrections?

Add 'em up vectorically or graphically.
The couple is 2 equal and opposite imbalances separated by some distance.  Choose that distance as your distance between correction planes.

Then break the "static" unbalance into 2 equal pieces, and add one to each end.

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