METHOD OF ASSEMBLING AND BALANCING HIGH-SPEED ROTORS AND SHAFT LINES OF AIRCRAFT GAS TURBINE ENGINES AND GAS COMPRESSOR UNITS Russian patent published in 2024 - IPC G01M15/14 G01M1/00 

FIELD: machine building.

SUBSTANCE: existing methods of balancing rotors with large blades do not allow their balancing on low-speed machines, since at high operating speeds of the engine, the rotor blades are deformed and unbalances appear, which lead to an increase in rotor vibrations. Disclosed is a method of assembling and balancing the rotor. Before assembly, all parts of rotors and shafts are marked, weighed and measured, first stage blades are virtually randomly installed in the low-pressure fan or compressor rotor impeller, creating a mathematical finite element model of the rotor impeller, for example, using the ANSYS package, at working speed, taking into account the effect of temperature, gas and centrifugal loads, solving the model, and the values of the calculated gas forces are used to determine the possibly best version of fixing the blades on the disc. First stage impeller is virtually assembled with blades fixed on it by means of said method, by connecting it with hub, and by the method of finite elements at working revolutions, taking into account the action on this unit of loads, the values of unbalances are determined and they are virtually eliminated by removing material from the blades and the disc. Rest of the rotor stages are virtually balanced. These parts are connected to the compressor rotor, unbalanced imbalances of the rotor are calculated and dynamic mass balancing of the rotor is performed at working speed. Modifying the real rotor parts to eliminate the virtual imbalance, assembling the rotor and installing it on the low-speed balancing machine, where residual unbalances of the machine support are determined, the results of virtual and real balancing on the machine are compared. When inadmissible values of residual unbalance are obtained during testing on the machine, the rotor is re-balanced on the machine by installation of balancing weights in two correction planes and the rotor is sent to the motor assembly.

EFFECT: higher accuracy of balancing of shaft lines and reduced number of bulkheads of aircraft gas turbine engines and other bladed machines.

1 cl, 3 dwg