초록 ▼

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 co

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.

대표청구항 ▼

[ I claim:] [1.] A diagnostic and corrective method to avert stall in a bearing supported rotating machine having a fluid throughput, the steps including:monitoring deflection of a shaft about which the machine rotates;comparing the deflection with a standard, andaltering the deflection of the shaft

[ I claim:] [1.] A diagnostic and corrective method to avert stall in a bearing supported rotating machine having a fluid throughput, the steps including:monitoring deflection of a shaft about which the machine rotates;comparing the deflection with a standard, andaltering the deflection of the shaft as the machine approaches a stall when indicated by the comparison step.