2 plane balancing without trial masses
2 plane balancing without trial masses
(OP)
Hi
Can someone explain how dynamic balancing machines determine the "trim weight" required without using trial weights? There is an example in this video http://erbessd-instruments.com/Eng/video.php (2 Planes Balancing of Turbocharger Rotor) that illustrates this. How does the machine accurately determine the location of the heavy spot and its location?
thanks
dynaman
Can someone explain how dynamic balancing machines determine the "trim weight" required without using trial weights? There is an example in this video http://erbessd-instruments.com/Eng/video.php (2 Planes Balancing of Turbocharger Rotor) that illustrates this. How does the machine accurately determine the location of the heavy spot and its location?
thanks
dynaman





RE: 2 plane balancing without trial masses
Cheers
Greg Locock
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RE: 2 plane balancing without trial masses
RE: 2 plane balancing without trial masses
Using complex maths
response_at_plane1=TF11*UB1+TF12*UB2
response_at_plane2=TF22*UB2+TF21*UB1
note that TF12=TF21 by reciprocity
Cheers
Greg Locock
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RE: 2 plane balancing without trial masses
Sorry what are UB1 & UB2 exactly? Is there a reference that explains this method in detail?
thanks
Mark.
RE: 2 plane balancing without trial masses
Yes I think the Bruel and Kjaer blue book on vibration analysis has a pretty good section on this method. http://www.bksv.com/doc/bn1330.pdf
Incidentally I'm not entirely convinced that TF12=TF21, that'd be an interesting check. Specifically if the accelerometers are not pointing in the same direction then I can imagine the phase relationship between the two would change.
Cheers
Greg Locock
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RE: 2 plane balancing without trial masses
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: 2 plane balancing without trial masses
RE: 2 plane balancing without trial masses
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: 2 plane balancing without trial masses
RE: 2 plane balancing without trial masses
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?