3. Dynamic bending analysis of a tree line

Any rotating machine in operation generates vibrations, the amplitudes of which depend essentially on :

• rotor geometry ;

• bearing stiffness and support;

• of the amortization provided by these same bearings ;

• sources of excitation, such as unbalance;

• rotor speed.

The dynamic bending analysis of a line of shafts consists of :

• determine the frequencies and strains of the damped bending eigenmodes of the rotors ;

• check that their separation margin with respect to excitation frequencies is sufficient;

• ensure that the vibration level at any point on the rotor is compatible...