Abstract
Among the ways to reduce vibrations of rotary machines with a vertical or horizontal axis of rotation is the use of ball-type automatic balancing devices. At the same time, the acceleration of compensating masses in the automatic balancing device with an annular cross-section of the housing showed that to accelerate the compensating masses to the operating speed of the rotor, it is necessary to provide the initial velocity due to the influence of gravity at the initial stage of acceleration. The value of the initial velocity of compensating masses depends on the parameters of the elastic suspension of the rotor, the size of the compensating mass, the coefficient of rolling friction between the compensating mass and the inner surface of the housing of the automatic balancing device and other parameters. In this work, the influence of the rolling friction coefficient and other parameters of the rotor system on the acceleration of compensating masses is studied, recommendations on the selection of parameters are given.
Highlights
A ball-type automatic balancing device (ABD) makes it possible to reduce the imbalance of the rotating unbalanced rotor on an elastic suspension in the super resonant frequency band
The acceleration of the compensating masses to the rotor speed depends on many parameters of the rotor system, among which are the stiffness of the elastic rotor suspension, the rolling friction coefficient of the CM on the internal surface of the ABD’s housing, etc. [1]
As a result of the calculations of the mathematical model of a horizontal rotor with a torusshaped ABD’s housing concentrically mounted on it and an annular cross section, it was determined that the smallest initial speed of the CM required for its acceleration to the operating speed of the rotor depends on the coefficients of stiffness and the elastic dissipation of the rotor suspension
Summary
A ball-type automatic balancing device (ABD) makes it possible to reduce the imbalance of the rotating unbalanced rotor on an elastic suspension in the super resonant frequency band. In certain cases, it is necessary to provide the initial speed [2] to accelerate the compensating masses of the ABD, otherwise the CMs stably move relative to the ABD’s housing (unsteady operating mode), which leads to increased rotor vibrations. In [3,4,5], the designs and stability of the automatic balancing mode are considered depending on the parameters of viscous friction in the ABD and in the suspension of the rotor system with a horizontal axis of rotation. It is of interest to determine the influence of the parameters of the elastic-dissipative rotor suspension on the performance of a torus-shaped automatic balancing device with a horizontal axis of rotation in the mode of CM’ acceleration.
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