Measuring and testing – Rotor unbalance – Dynamic
Patent
1992-05-20
1995-04-25
Chapman, John E.
Measuring and testing
Rotor unbalance
Dynamic
73468, G01M 124
Patent
active
054088755
ABSTRACT:
A balancing method for balancing a flexible rotor is disclosed. First, the rotor is rotated and vibration of the rotor is measured to determine resonance speeds. Vibration exciting forces of frequencies synchronized with the rotor rotation in two orthogonal directions are imparted to the rotor or rotor support bearings while rotating the rotor at a speed near the respective resonance speeds. The amplitude and the phase of the vibration exciting force which reduces the resonance vibration of the rotor are then determined. A correction weight on the basis of the amplitude and the phase of the vibration exciting force is then determined. Balancing work on the rotor such as grinding of the rotor or addition of a mass to the rotor in accordance with the correction weight is then carried out, followed by a rotor rotation conducted for the purpose of confirming the effect of the balancing work.
REFERENCES:
patent: 3141338 (1964-07-01), Hack
patent: 4098127 (1978-07-01), Shiga et al.
patent: 4359896 (1982-11-01), Brown et al.
patent: 4963804 (1990-10-01), Geiger
patent: 5084643 (1992-01-01), Chen
Proceedings of 3rd International Conference on Rotordynamics, Sep. 10-12, 1990, Lyon, France, Y. Kanemitsu et al, "Real Time Balancing of a Flexible Rotor Supported by Magnetic Bearing." pp. 263-268.
ISO 5406, "The Mechanical Balancing of Flexible Rotors," First Edition, 1980, pp. 6-9.
Fukushima Yasuo
Hiroshima Minoru
Matsushita Osami
Ohashi Teturo
Sakanashi Naohumi
Chapman John E.
Hitachi , Ltd.
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