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Stiffness/Damping coefficients at nonsynchronous rotational speed

Stiffness/Damping coefficients at nonsynchronous rotational speed

Stiffness/Damping coefficients at nonsynchronous rotational speed

(OP)
Hy,

the calculated stiffness- and damping values for plain cylindrical journal bearings are valid only for forces with rotational speed. How do they change with much higher frequencies (10x rotational speed) ?

Thanks for your comments
Frank

RE: Stiffness/Damping coefficients at nonsynchronous rotational speed

Plain journal bearings are modeled with constant coefficients for stiffness and damping(not freq. dependent).  They are generally good for non-synchronous.  If the frequency were extremely high, there may not be confirming test data, but otherwise this is what tests have shown.

Regards,

Bill

RE: Stiffness/Damping coefficients at nonsynchronous rotational speed

We are typically more worried about speeds less than running speed due to instability. I am curious why your are interested 10X.  

Typically above a certain speed the curves flatten out and the KXX and KXY coefficients stay the same...

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