Method and apparatus for varying the critical speed of a shaft

Details Method and apparatus for varying the critical speed of a shaft Method and apparatus for varying the critical speed of a shaft

2005-01-25

2005-01-25

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Method of operation

C416S174000, C415S229000, C384S099000

Reexamination Certificate

active

06846158

ABSTRACT:
A system is provided for changing the critical speed of a shaft that includes: a first shaft supported for relative rotational movement with respect to a stationary structure, a forward bearing disposed at the forward end of the shaft, an aft bearing disposed at the aft end of the shaft, at least one active bearing disposed between the forward bearing and the aft bearing, and means for changing the support stiffness of the active bearing.

REFERENCES:
patent: 4457667 (1984-07-01), Seibert et al.
patent: 4737655 (1988-04-01), Lundberg
patent: 4867655 (1989-09-01), Barbic et al.
patent: 4983051 (1991-01-01), Hibner et al.
patent: 5110257 (1992-05-01), Hibner et al.
patent: 5347190 (1994-09-01), Lewis et al.
patent: 5374129 (1994-12-01), Vohr et al.
patent: 5603574 (1997-02-01), Ide et al.
patent: RE36270 (1999-08-01), Duggan
patent: 6554754 (2003-04-01), VanRens

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