Parametric studies on modified configurations of ball-type passive balancers for improved transient and steadystate responses

A passive balancing device is a bearing with a set of masses that are free to move about a shaft axis of rotation. Beyond the first critical speed of the shaft, the masses assume positions that reduce vibrations due to imbalance. The conventional design of passive balancers is a dual-ball bearing. T...

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Bibliographic Details
Published in:Journal of sound and vibration 2018-10, Vol.432, p.633-652
Main Authors: Haidar, Ahmad M., Palacios, Jose L.
Format: Article
Language:English
Subjects:
Axes of rotation
Ball bearings
Bearings
Configuration management
Configurations
Friction
Mathematical models
Parametric statistics
Partitions
Passive balancing
Performance enhancement
Rolling resistance
Rotating shafts
Rotordynamics
Structural dynamics
Supercritical processes
Vibration
Vibration control
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Summary:A passive balancing device is a bearing with a set of masses that are free to move about a shaft axis of rotation. Beyond the first critical speed of the shaft, the masses assume positions that reduce vibrations due to imbalance. The conventional design of passive balancers is a dual-ball bearing. This type of balancer only performs its function at supercritical speeds and when the ball/track contact is nearly frictionless. In this work, additional experimental verification of a previously formulated mathematical model is conducted using published experimental data. The model was then used to investigate passive balancing performance numerically. Conventional and non-conventional bearing configurations were tested with consideration of rolling resistance and ball collisions. Results suggest that when rolling resistance is considered, a 1-track bearing configuration with any number of balls yields better performance than multi-track bearings. The 1-track configuration improved performance by 57% when compared to a 3-track configuration at supercritical steadystate. It is also shown that a multi-partition balancer improves performance significantly during shaft speed up – 69% improvement compared to a balancer without partitions. With configuration adjustments, the bearing remains entirely passive while vibration suppression performance is improved.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2018.06.057