TY - JOUR
T1 - Modified ball-type automatic balancer for rotating shafts
T2 - Analysis and experiment
AU - Haidar, Ahmad M.
AU - Palacios, Jose L.
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/3/31
Y1 - 2021/3/31
N2 - The automatic balancer is a passive device with masses that are free to move in a shaft-concentric race. At supercritical shaft speeds, the masses automatically re-align to counteract imbalance and reduce vibration. This phenomenon is caused by the phase shift of the shaft bending response that occurs through resonance. The conventional automatic balancer (dual-ball, single race) reduces or eliminates vibration at supercritical speeds given a frictionless race, but increases vibration at subcritical and critical speed transitions. In this work, a fully passive, partitioned-track, automatic balancer with centrifugal clamps is proposed to improve performance during suboptimal operation. Both analysis and experiment are presented to support the novel design. Experimentally, a partitioned-race balancer reduced vibration by 7% during spin up, 83% at supercritical steadystate, and 65% during spin down – a complete improvement over conventional balancers. Model predictions are within 14% of experimental data at steadystate. Additionally, the use of centrifugal clamps reduced vibrations by up to 95% during critical speed transitions in analysis. The vibration reduction capability presented in this research outside of supercritical steadystate operation is a necessary advancement for the practical application of passive balancing devices.
AB - The automatic balancer is a passive device with masses that are free to move in a shaft-concentric race. At supercritical shaft speeds, the masses automatically re-align to counteract imbalance and reduce vibration. This phenomenon is caused by the phase shift of the shaft bending response that occurs through resonance. The conventional automatic balancer (dual-ball, single race) reduces or eliminates vibration at supercritical speeds given a frictionless race, but increases vibration at subcritical and critical speed transitions. In this work, a fully passive, partitioned-track, automatic balancer with centrifugal clamps is proposed to improve performance during suboptimal operation. Both analysis and experiment are presented to support the novel design. Experimentally, a partitioned-race balancer reduced vibration by 7% during spin up, 83% at supercritical steadystate, and 65% during spin down – a complete improvement over conventional balancers. Model predictions are within 14% of experimental data at steadystate. Additionally, the use of centrifugal clamps reduced vibrations by up to 95% during critical speed transitions in analysis. The vibration reduction capability presented in this research outside of supercritical steadystate operation is a necessary advancement for the practical application of passive balancing devices.
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U2 - 10.1016/j.jsv.2020.115927
DO - 10.1016/j.jsv.2020.115927
M3 - Article
AN - SCOPUS:85098934864
VL - 496
JO - Journal of Sound and Vibration
JF - Journal of Sound and Vibration
SN - 0022-460X
M1 - 115927
ER -