Measuring and testing – Rotor unbalance – Dynamic
Patent
1984-10-03
1986-10-28
Kreitman, Stephen A.
Measuring and testing
Rotor unbalance
Dynamic
73473, 73477, G01M 116
Patent
active
046191429
ABSTRACT:
A method and apparatus for measuring vibrational forces emitted by a reaction wheel assembly during rotation of its rotor includes a low mass carriage (12) supported on a large mass base (10). The carriage (12) is in the form of an octagonal frame having an opening which is adapted for receiving the reaction wheel assembly (W) supported thereon by means of a mounting ring (22). The carriage (12) is supported on the base (10) by means of air bearings (A) which support the carriage in a generally frictionless manner when supplied with compressed air from a source (50). A plurality of carriage brackets (34) and a plurality of base blocks (30) provide for physical coupling of the base (10) and carriage (12). The sensing axes of the load cells (B) are arranged generally parallel to the base (10) and connected between the base and carriage such that all of the vibrational forces emitted by the reaction wheel assembly (W) are effectively transmitted through the sensing axes of the load cells. In this manner, a highly reliable and accurate measurement of the vibrational forces of the reaction wheel assembly can be had. The output signals from the load cells (B) are subjected to a dynamic analyzer (42) which analyzes and identifies the rotor and spin bearing components which are causing the vibrational forces.
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Beumer Joseph H.
Kreitman Stephen A.
Manning John R.
Oldham Scott M.
The United States of America as represented by the Administrator
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