Method and system for diagnosing mechanical, electromechanical or fluidic components
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Abstract
There is described a diagnosis method and a system comprising a structure-born noise sensor which transmits, in a bandpass filtered manner, a measuring signal based on the mechanical resonance frequency and capacity thereof and on an inductance and an evaluating device in which the frequency, at which the measuring signal level exceeds a predetermined threshold value, is defined and which is used for producing an error signal, when the frequency exceeds a second predetermined threshold value. As far as the diagnosis performance requires a small number of electronic components and a low power supply, the diagnostic can be integrated into existing devices, in particular into process instrumentation field devised for which a restricted quantity of operating power is available. The method and the system can be used for identifying a valve leakage with the aid of an electro-pneumatic positional regulator.
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Citations
19 Claims
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1-5. -5. (canceled)
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6. A method for diagnosing a component, comprising:
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providing a sensor for structure-borne noise; providing a device for analyzing a received measurement signal; measuring the measurement signal via the sensor; outputting the measurement signal by the sensor in a bandpass filtered manner by virtue of its mechanical resonance frequency, a capacitance of the sensor and a inductance of the sensor; determining an occurrence with which a level of the measurement signal exceeds a first predefined threshold value; and generating an error report signal if the ascertained occurrence exceeds a second predefined threshold value. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for diagnosing components selected from the group consisting of a mechanical component, an electromechanical component, a fluidic component and a combination thereof, comprising:
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a sensor for structure-borne noise, wherein the sensor is comparatively insensitive in the range of low-frequency working noises and sensitive in a higher-frequency range of error noises; and a device to analyze a measurement signal from the sensor, wherein the device ascertains a frequency with which the level of the measurement signal exceeds a first predefined threshold value, and wherein the device generates an error report signal if the ascertained frequency exceeds a second predefined threshold value. - View Dependent Claims (17, 18, 19)
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Specification