Diagnostic system and method, especially for a valve
First Claim
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1. A diagnostic system comprising:
- a sensor operable to sense structure-borne noise; and
an evaluation unit operable to evaluate a recorded measurement signal, wherein said evaluation unit is configured such that a spectral region of the measurement signal above a first limit frequency, where the first limit frequency is greater than 50 kHz, is evaluated for fault detection, and a fault indication signal is generated if an intensity of the measurement signal in the spectral region exceeds a threshold value.
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Abstract
The invention relates to a diagnostic system and method, especially for a valve (2) that can be actuated by a positioner (9) via a drive (6). The system utilizes a sensor (12) for recording structure-related sound and has a device (14) for evaluating a recorded measurement signal (13). A spectral region greater than 50 kHz is evaluated for conducting fault recognition. A fault indication signal is generated if the intensity of the measurement signal in this spectral region exceeds a defined threshold value. The sound caused by cavitation is primarily evaluated for conducting fault recognition.
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23 Claims
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1. A diagnostic system comprising:
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a sensor operable to sense structure-borne noise; and
an evaluation unit operable to evaluate a recorded measurement signal, wherein said evaluation unit is configured such that a spectral region of the measurement signal above a first limit frequency, where the first limit frequency is greater than 50 kHz, is evaluated for fault detection, and a fault indication signal is generated if an intensity of the measurement signal in the spectral region exceeds a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A diagnostic method comprising:
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sensing structure-borne noise;
evaluating a recorded measurement signal for fault detection, wherein a spectral region of the measurement signal above a first limit frequency greater than 50 kHz is evaluated; and
generating a fault indication signal if the intensity of the measurement signal in the spectral region exceeds a threshold value. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for determining a fault in a valve through which a gaseous or a liquid material flows, the method comprising:
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measuring an acoustic signal generated in a vicinity of the valve as the gaseous or liquid material flows through the valve;
separating the acoustic signal into a low frequency portion and a high frequency portion; and
determining a likelihood value representing a likelihood that the valve has a fault, wherein the likelihood value is based on the high frequency portion of the acoustic signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification