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- W4225577423 abstract "Automatic balancers present a modular possibility to counteract variable rotor unbalances during operation. Two or more balancing masses, usually spheres, can orbit in a fluid-filled annular cavity whose axis of symmetry coincides with the rotor axis. At supercritical speeds, the masses – driven by the rotor deflection – tend towards stationary positions inside the cavity opposing the primary rotor unbalance. Related to the phenomenon of rotating shafts being captured at resonances due to insufficient drive power, automatic ball balancers inhibit operation speed bands with non-synchronous vibrations where the rotor surpassed the resonance, but the balls continue to orbit with the eigenfrequency with respect to the inertial system. As a result, the balancing masses do not take stationary positions inside the cavity and the rotor is excited not only by the primary unbalance but also by the sub-synchronously orbiting balancing masses. The width of the operation speed band exhibiting non-synchronous behaviour depends on the balancing masses, the orbit radius, external damping of the rotor and viscous damping of the balls due to the fluid inside the cavity. For a planar oscillator in isotropic supports with a balancer containing two balancing balls, an explicit correlation between the stability border and the fluid damping is presented. In order to parameterize the fluid damping model, the drag on spheres in annular cavities is examined and a proposed relation based on the cavity geometry and the fluid properties is presented." @default.
- W4225577423 created "2022-05-05" @default.
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- W4225577423 date "2022-01-01" @default.
- W4225577423 modified "2023-10-14" @default.
- W4225577423 title "Approximating Unstable Operation Speeds of Automatic Ball Balancers Based on Design Parameters" @default.
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- W4225577423 doi "https://doi.org/10.1007/978-3-030-92144-6_17" @default.
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