Method and device for detecting a pulse-type mechanical effect on a system part
First Claim
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1. A method for detecting a pulse-type mechanical effect on a system part, which comprises:
- continuously detecting, with a sensor disposed on the system part, an operating noise present in the system part and converting the detected operating noise into a measurement signal;
determining a magnitude of a frequency spectrum of the measurement signal in temporally sequential time segments at predefined frequencies;
determining a deviation of the magnitude from a mean magnitude for each time segment and each of the predefined frequencies;
deriving a single evaluation function common for all frequencies for each time segment from the deviations determined for each of the predefined frequencies, each deviation making a contribution to the evaluation function; and
comparing the evaluation function with a threshold value, and utilizing an overshooting of the threshold value as an index for a presence of a pulse-type signal component indicating the mechanical effect.
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Abstract
A method and device for detection of a pulsed mechanical effect on a plant component includes continuously recording an operating noise in the plant component with a sensor disposed on the plant component and converting the recorded noise into a measured signal with the sensor. Then, the measured signal is subjected to a Fourier transformation. An evaluation function is derived from a number of value spectra determined in the above manner, which gives the onset of a pulsed mechanical effect on the plant component.
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11 Claims
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1. A method for detecting a pulse-type mechanical effect on a system part, which comprises:
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continuously detecting, with a sensor disposed on the system part, an operating noise present in the system part and converting the detected operating noise into a measurement signal;
determining a magnitude of a frequency spectrum of the measurement signal in temporally sequential time segments at predefined frequencies;
determining a deviation of the magnitude from a mean magnitude for each time segment and each of the predefined frequencies;
deriving a single evaluation function common for all frequencies for each time segment from the deviations determined for each of the predefined frequencies, each deviation making a contribution to the evaluation function; and
comparing the evaluation function with a threshold value, and utilizing an overshooting of the threshold value as an index for a presence of a pulse-type signal component indicating the mechanical effect. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for detecting a pulse-type mechanical effect on a system part, comprising:
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at least one sensor to be disposed on the system part, said at least one sensor continuously detecting and measuring an operating noise present in the system part and generating measurement signals therefrom;
an A/D converter connected to said at least one sensor, said A/D converter digitizing said measurement signals detected by said at least one sensor and outputting digitized measurement signals;
a digital device connected to said A/D converter and receiving said digitized measurement signals, said digital device being programmed to;
determine a magnitude of a frequency spectrum of said measurement signals in temporally sequential time segments for predefined frequencies;
determine a deviation of the magnitude from a mean magnitude for each time segment and each of said predefined frequencies, derive a single evaluation function common for all frequencies for each time segment from the deviations determined for each of said predefined frequencies each deviation making a contribution to said evaluation function; and
comparing the evaluation function with a threshold value and passing on an alarm signal upon an overshooting of said threshold value. - View Dependent Claims (8, 9, 10, 11)
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Specification