What is the difference between modes and nodes?

John from PA posted:

The attached will provide a pictorial of simple mode shapes for a rotor.

For extensive details, I suggest you review http://sandv.com/downloads/0505swan.pdf for material related to mode shapes.



Dear john

According to this case study,

They had backward whirling during cost down and couse to drop  resonance frequency .so it mentioned that this ocoures  because of asymmetric bearing or nonlinerity stiffness . My question is what is the another source of backward whirl ? 

Can it phenomenia help us to machin fault dedtection ?  For example excessive bearing clearance or etc

Beat regarded 


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