Static and Dynamic Balancing || Static and dynamic balancing of rotating masses || DOM || TOM

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Static balance refers to the ability of a stationary on object to its balance. This happens when the objects centre of gravity is on the axis of rotation. Whereas dynamic balance is the ability of an object to balance whilst in motion or when switching between positions.

What is Static Balancing?
Static balance occurs when the centre of gravity of an object is on the axis of rotation. This allows the object to remain stationary, with the axis horizontal, without the application of any braking force. Static balance has no tendency to rotate due to the force of gravity.

What is Dynamic Balancing?
Dynamic balancing is when the rotation does not produce any resultant centrifugal force or couple. The system will rotate without needing the application of any external force or couple, other than that required to support its weight. When a system or machine is unbalanced, to avoid stress being put upon the bearings, a counterbalancing weight is added. Dynamic balancing is a way to balance out machines by rotating parts quickly and then measuring the imbalance using electronic equipment. The imbalance calculated can then be added or subtracted from the weight until the vibration of the parts is reduced

Rotating parts in machines should be free of vibration to ensure their smooth operation and long service life. Reducing the vibration in your machinery relies on a number of factors, like a smooth rotating shaft, good bearing condition, and proper lubrication, but one of the most important ways to guarantee vibration-free operation is through symmetrical mass distribution.

Although designers strive to create machinery to be as symmetrical as possible, in practice, all rotating bodies have weight asymmetries about the axis of rotation, and this causes vibration. Vibrations cause the machine to be noisy and reduce the life of its parts, especially the bearings. Vibration can also cause structural fatigue stress, and excessive vibration can lead to dangerous operating conditions from unexpected catastrophic failures.

Static and dynamic balancing of motors and generators will make them run smoother and operate more efficiently for longer periods of time. Balancing will also improve the working environment of the machine operators by reducing noise, minimizing vibrations, and eliminating the risk of dangerous catastrophic failures.
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