METHOD TO PROVIDE RESISTANCE OF TURBOMACHINE WORKING BLADES TO SELF-EXCITED VIBRATIONS Russian patent published in 2014 - IPC F04D29/38 

FIELD: machine building.

SUBSTANCE: method to provide for the resistance of turbomachine working blades to self-excited vibrations implies that the first and the second flexural modes and the first torsional mode of self-excited vibrations and the frequencies corresponding to them are determined for the initial blade, flexure-torsion relatedness criterion is chosen and the range of its permissible values is set, the initial blade is built as per the self-excited vibrations, the flexure-torsion relatedness criterion for the built blade is determined, and basing on belonging of its value to the specified range the resistance to the self-excited vibrations is evaluated, in contrast to the known method the initial blade building according to the self-excited vibrations is performed by bending its airfoil to the side of the blade back, the bend shape corresponds to the first flexural mode of self-excited vibrations of the initial blade.

EFFECT: improved resistance of turbomachine working blades to self-excited vibrations without reprofiling and increase of their weight.

2 dwg