Measuring and testing – Vibration – By mechanical waves
Patent
1994-05-06
1997-01-14
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73658, 73168, G01M 1300
Patent
active
055941753
ABSTRACT:
An apparatus compares the torque from an MOV motor with the valve displacement, and from the comparison assesses MOV operating condition. A transducer measures the vibration of the housing of an MOV. The vibrations are due to the motions of the rotating elements within the housing, which motions are directly related to the motion of the valve relative to its seat. Signal processing apparatus analyzes the vibrations to recover the rotations of the rotating elements and thus the motion of the valve plug. Lost motion can also be determined (if a lost motion connection exists) by demodulating the vibration signal and thus taking into account also the lost motion. Simultaneously, the forces applied to the valve are estimated by estimating the torque between the stator and the rotor of the motor. Such torque can be estimated from measuring the input current and voltage alone, using a forgetting factor and a correction for the forgetting factor. A signature derived from relating the torque to the valve position can be used to assess the condition of the MOV, by comparing the signature to signatures for MOVs of known conditions. The vibration analysis components generate signals that relate to the position of elements in the operator. Similarly, the torque estimator estimates the torque output by any type of electric motor, whether or not part of an MOV analysis unit.
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Chai Jangbom
Hagman Wayne H.
Lang Jeffrey H.
Lyon Richard H.
Saarela Olli J.
Chilcot Richard
Massachusetts Institute of Technology
Noori Max
Weissburg Steven J.
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