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US 2015/0032270 A1Published application
Spectral analysis based detector for a control valve
AssigneeDresser, Inc.
InventorsJagadish Gattu, Justin Shriver
Life of this patent
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Abstract
Systems and methods for diagnosing components of a control system are disclosed herein. In some embodiments, the spectral content of various signals originating from a control valve is used to detect periodic patterns that can correspond to valve problems.
Claims20
A method for diagnosing a control system using a computer processor in communications coupling with the control system, comprising:
- using the processor, receiving valve data corresponding to a valve, said valve data comprising at least one of position data generated by a position sensor configured to detect a position of the valve, actuation force data generated by an actuation force sensor configured to detect an actuation force applied to the valve, and set point data generated by the control system to control the position of the valve;
- using the processor, calculating the spectral content of the valve data and analyzing said spectral content to detect whether or not the valve is experiencing cyclic behavior;
- and
- if the valve is experiencing cyclic behavior, using the processor to at least one of adjust the control of the valve to stop the cyclic behavior and cause an electronic display to display a notification of the cyclic behavior.
1 more element
A method of diagnosing cyclic behavior of a control valve, said method being executed by a computer processor, said method comprising:
- receiving position data corresponding to a valve, said position data being generated by a valve position sensor configured to sense a position of the valve;
- converting the position data to a frequency domain;
- diagnosing cyclic behavior if a dominant frequency exists in the frequency domain of the position data;
- and
- if cyclic behavior is diagnosed,
- diagnosing shut-off cycling if the minimum of the position data is within a shut-off region of the valve and the first order differential of the position data at the minimum is approximately zero;
- if shut-off cycling is not diagnosed, receiving set point data corresponding to the valve and diagnosing stick-slip cycling if the root mean squared error of the position data and the set point data is greater than a predetermined threshold;
- if shut-off cycling and stick-slip cycling are not diagnosed, diagnosing aggressive tuning;
- and
- at least one of adjusting the control of the valve to stop the cyclic behavior and causing an electronic display to display a notification of the presence and type of the cyclic behavior.
7 more elements
A system for diagnosing cyclic behavior of a valve, comprising:
- a computer processor configured to
- receive valve data comprising at least one of position data, actuation force data, and set point data corresponding to a valve;
- detect whether or not the valve is experiencing cyclic behavior by analyzing the spectral content of the valve data;
- and
- at least one of adjust the control of the valve to stop the cyclic behavior and notify a user of the presence and type of the cyclic behavior.
2 more elements
Dependencies are inferred from the claim text.