Abstract
This paper is concerned with diagnosing the construction of motor operated valves (MOVs) based on their performance in previous runs. One part of the signature that reveals condition is valve travel, which is to be determined non-invasively. The technique described here is based on the determination of valve stem rotation through the analysis of gear meshing forces. These forces are, in turn, determined from the vibrations they produce in the MOV housing. These vibrations are interpreted as forces through inverse filtering of the received signals. The gear mesh force signals are, in turn, related to gear rotation through frequency demodulation. Experimental results from a laboratory set-up indicate that this procedure leads to acceptable estimates of shaft rotation and valve travel.
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