natural frequency of panel

[dalej2]

what equation would you use to calculate the natural frequency of a panel that has a 2hp motor attached to it running at 1160 rpm's.

 

[ivymike]

(k/m)^0.5

Where k and m may be more difficult to calculate...

k can perhaps be estimated by looking up deflection of a flat plate under localized loading (Roark). Pay attention to the edge conditions!

m can perhaps be estimated by adding an allowance for plate mass to the mass of the engine.

Might be easier to use FEA.

 

[dalej2]

i've got pro/e mechanica and mechanism, however, i am not aware of how to add a motor to the assembled parts i have in pro/mechanism

 

[tnkayaker]

You can add a point mass in Mechanica, or make a box that will have the same footprint as your motor and assign it the mass of the motor.

Erik

 

[ivymike]

It might be slightly better to make an object with the footprint of the motor, and with similar mass and moments of inertia (will represent "motor wobbling" modes of vibration better).