Method and apparatus for diagnosing and controlling rotating sta

Details Method and apparatus for diagnosing and controlling rotating sta Method and apparatus for diagnosing and controlling rotating sta

1998-02-19

2000-07-18

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

702190, G05B 1300

Patent

active

060920297

ABSTRACT:
A method and apparatus is provided for diagnosing and correcting rotating stall and surge in rotating machines by monitoring dynamic shaft precession and comparing this precession with a standard and altering the precession as the machine approaches a destabilizing condition when indicated by the comparison step. Axial vibration monitoring means is also provided for monitoring and comparing a dynamic axial vibration of the machine with a standard and altering the axial vibration as the machine approaches a destabilizing condition. Furthermore, the instant invention measures the complex dynamic stiffness of the machine and computes the direct dynamic stiffness and the quadrature dynamic stiffness for use as a destabilizing warning device by monitoring for a drop in direct dynamic stiffness and/or a coincidence of zero crossing of both the direct dynamic stiffness and the quadrature dynamic stiffness components. One embodiment for altering the rotating stall and/or surge is by a controlled active servobearing.

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