Non-spinning dynamic balancing machine and method

Details Non-spinning dynamic balancing machine and method Non-spinning dynamic balancing machine and method

1984-01-09

1985-08-06

Levy, Stewart J.

Measuring and testing

Rotor unbalance

Dynamic

G01M 116

Patent

active

045328030

ABSTRACT:
Balancing an object with an irregular shape capable of generating substantial aerodynamic forces may be accomplished at atmospheric pressure by angularly oscillating the object about a vertical axis, measuring the horizontal reaction torques and forces, and calculating the imbalances in the object. Apparatus for such a method includes an object-supporting table, means for angularly oscillating the table relative to a cradle, and struts coupling the cradle to a base such that any imbalance in the object will result in reaction torques and forces being exerted by the cradle. Transducers detect these reaction torques and forces. A circuit processes the output of the transducers to provide signals representing those detected forces which are a component of a sinusoid at the frequency of oscillation that is in phase with the angular acceleration of the table. Such signals provide a measure of the imbalance of the object. The invention is especially useful in balancing objects having unusual non-symmetrical shapes or protrusions, such as spacecraft, where conventional spin balancers are not effective because of effects caused by aerodynamic forces.

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