Unbalance - Various Combinations of Dynamic Unbalance

Practical Solutions to Machinery and Maintenance Vibration Problems

Chapter 5, Unbalance

Section 3, Various Combinations of Dynamic Unbalance

Confusion often results when "static unbalance" is also referred to as "dynamic unbalance." the confusion is very understandable as dictionary definitions suggest that the word "static" has an opposite meaning to the word "dynamic." True! But unfortunately, the phrase "static unbalance" was derived from an old method used for static balancing (on a static balancing machine, usually a set of rollers on a stand). The static unbalance was revealed as the rotor was rolled by gravity to the 6:00 o'clock position. For understanding unbalance itself and especially for vibration analysis, it's best not to visualize the method used for removing static unbalance, but to instead visualize the in-phase and equal forces.

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