Apparatus for adjusting rotor

Details Apparatus for adjusting rotor Apparatus for adjusting rotor

1993-04-01

1996-03-26

Voeltz, Emanuel T.

Boots, shoes, and leggings

364463, 73658, 73659, 73660, 73657, G01H 114, G01M 702

Patent

active

055026508

ABSTRACT:
To improve the coupling adjustment workability and precision of a rotor, irrespective of change in bearing characteristics due to an increase of rotational speed, the apparatus detects angular frequencies (.omega.) and reference mark positions (.theta.) of the rotor; detects vibration displacements (r) of the rotor; analyzes vibration vector components (.omega.), (r) and (.theta.) of rotation synchronizing vibrations; extracts a specific angular frequency (.omega..sub.1) at which a higher harmonic vibration frequency (.omega..sub.R) matches a natural frequency of the rotor, and various rotation synchronizing vibration vector components at (.omega..sub.1), at (.omega..sub.R) and (.omega..sub.2 to .omega..sub.i), respectively; estimates static vibration vector components (r.sub.0, .theta..sub.0) at zero angular frequency (.omega..sub.0) on the basis of rotation synchronizing vibration vector components (r.sub.T, .theta..sub.T) at (.omega..sub.1 to .omega..sub.i) and in accordance with a polynomial; obtains dynamic vibration vector components (r.sub.n, .theta..sub.n) by subtracting the static vibration vector components (r.sub.0, .theta..sub.0) from the rotation synchronizing vibration vector components (r.sub.Tn, .theta..sub.Tn), respectively; identifies a vibration response function; and estimates an eccentric direction (.theta.) and an eccentric quantity (.delta.) to be adjusted on the basis of (r.sub.n, .theta..sub.n) at (.omega..sub.R) and at (.omega..sub.1 to .omega..sub.i) and in accordance with the identified vibration response function. Further, the real time vibration status of the rotor and the estimated eccentric direction and quantity are all displayed.

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Walter, T. J. et al, "Diagnosing Vibration Problems in Vertically Mounted Pumps", Transactions of the ASME, vol. 110, pp. 172-177, New York, Apr. 1988.
Verhoeven, J. J. et al, "Development and Operating Experience of a 5000 KW Test Boilerfeed Pump on Active Magnetic Bearings", IMechE, C439/004, pp. 91-103, United Kingdom, 1992.

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