Method and system for detection and localization of a fluid related to a piston machine
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United States of America Patent
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Oct 25, 2016
Grant Date -
Oct 24, 2013
app pub date -
Nov 18, 2011
filing date -
Nov 22, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method for detecting and localizing a valve leak in a piston machine having a shaft includes: attaching one or more vibration sensor to a valve block of the piston machine; measuring the vibrations from at least one of the vibration sensors; attaching a sensor to the piston machine where the sensor is designed to produce, directly or indirectly, an angular shaft position signal for the shaft; determining, directly or indirectly, an angular shaft position signal for the shaft; transforming vibration signals from the one or more vibration sensors into one envelope signal representing an instant vibration level; using the angular position signal for constructing window functions that pick the envelope signal in selected angular shaft sectors; using the window functions to find sector based averages of the vibration level; and comparing said averages with a critical ambient vibration level to detect and localize leaks in one or two valves.
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