Patent RU-2694142-C1 (RU)
Title: Method of balancing rotor in one correction plane
Inventor: KLYUCHNIKOV ALEKSANDR VASILEVICH
IPC: G01M1/16
Filed: 2018-09-27
Granted: 2019-07-09
Abstract: FIELD: machine building. 
     SUBSTANCE: invention relates to machine building, namely, to balancing of revolution bodies in dynamic mode, and can be used for vertical single-plane dynamic balancing of long rotors, namely conical shaped aircraft. Proposed method consists in that rotor is installed in support of balancing stand with preset maximum permissible values of mass-inertia asymmetry parameters – transverse shift of centre of gravity and deviation angle of PCAI relative to its geometrical axis, having two correction planes located on ends, one of which is a balancing one, and another is a test one, and having known mass, distances from the centre of mass to correction planes, values of moments of inertia. Rotor is rotated, at rotation with constant angular speed, first, amplitude and phase of vibrations of both supports, caused by initial imbalances of rotor. Then, successively attaching test loads to each of correction planes, amplitudes and phases of vibrations of both supports are measured again. After determination of balancing sensitivity of test bench and coefficients of interference of correction planes, as well as determining values and angles of vectors of initial unbalances in each correction plane, performed based on measurement results of amplitudes and phases of vibrations of both supports during rotation in rotor supports, which is in initial state, and rotor, to correction planes of which are attached in series test loads. Initial values of mass-inertia asymmetry parameters are calculated. And if at least one of the specified maximum allowable values is exceeded, a balancing imbalance is created in the balancing correction plane, having previously calculated its value and angular position. When balancing unbalance is created, the appearance of compensating imbalance in balancing correction plane is simulated, which ensures elimination of initial imbalance in this correction plane. Then taking into account coefficient of interference of correction planes, simulating appearance of correcting imbalance in balancing correction plane, providing the transverse shift of the centre of mass and the deviation angle of the longitudinal PCAI relative to the geometric axis of the rotor to values which do not exceed the corresponding given maximum permissible values. Using parameters of compensating and correcting imbalances, calculating parameters of balancing unbalance, by value of which determining weight and angular position of balancing weight, then, weight of rotor is corrected by attaching balancing weight to balancing plane in angular position corresponding to angular position of balancing unbalance. After that, residual values of mass-inertia asymmetry parameters are determined, and then balancing of rotor is determined by comparison of residual and preset maximum allowable values of mass-inertia asymmetry parameters. 
     EFFECT: technical result consists in providing possibility of eliminating or achieving minimum value of deflection angle of lengthwise PCAI from geometrical axis of rotor in process of reduction of values of parameters of its mass-inertia asymmetry to values not exceeding specified maximum permissible values. 
     1 cl, 2 dwg