Apparatus for monitoring the condition of a machine
First Claim
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1. A system for detecting an operating condition of a machine including a bearing associated with a shaft that rotates at a speed of rotation, the system comprising:
- a vibration sensor configured to detect mechanical vibrations responsive to the rotation of the shaft with respect to the bearing;
an analog to digital converter configured to generate a digital measurement signal having sample values responsive to the detected mechanical vibrations so that said digital measurement signal includes a vibration signal signature; and
one or more hardware processors configured to;
generate an output value based on at least one of said sample values selected from a first temporal portion of the digital measurement signal;
generate a transformed signal based on a second temporal portion of said digital measurement signal; and
coordinate the generation of said transformed signal with the generation of the output value so that the second temporal portion is based on said first temporal portion of the digital measurement signal.
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Abstract
A method for analyzing the condition of a machine, and an apparatus for analyzing the condition of a machine are described.
15 Citations
26 Claims
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1. A system for detecting an operating condition of a machine including a bearing associated with a shaft that rotates at a speed of rotation, the system comprising:
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a vibration sensor configured to detect mechanical vibrations responsive to the rotation of the shaft with respect to the bearing; an analog to digital converter configured to generate a digital measurement signal having sample values responsive to the detected mechanical vibrations so that said digital measurement signal includes a vibration signal signature; and one or more hardware processors configured to; generate an output value based on at least one of said sample values selected from a first temporal portion of the digital measurement signal; generate a transformed signal based on a second temporal portion of said digital measurement signal; and coordinate the generation of said transformed signal with the generation of the output value so that the second temporal portion is based on said first temporal portion of the digital measurement signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for detecting an operating condition of a machine including a bearing associated with a shaft that rotates at a speed of rotation, the method comprising:
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generating, by way of a vibration sensor applied to a measuring point on the machine, an analogue measurement signal responsive to mechanical vibrations emanating from the bearing during rotation of the shaft so that said analogue measurement signal includes a vibration signal signature having a vibration signal repetition frequency and a vibration signal amplitude; sampling, by way of an analog to digital converter, said analogue measurement signal; generating, from said sampling, a digital measurement signal having sample values responsive to the detected mechanical vibrations so that said digital measurement signal includes said vibration signal signature; generating, by way of one or more hardware processors, a peak amplitude value based on a first temporal portion of the digital measurement signal; generating, by way of said one or more hardware processors, a Fourier transformed signal based on a selected second temporal portion of said digital measurement signal; and coordinating, by way of said one or more hardware processors, the generation of said Fourier transformed signal with the generation of said peak amplitude value so that said transformed signal and said peak amplitude value are based on the same or substantially the same temporal portion of the digital measurement signal. - View Dependent Claims (22, 23, 24, 25)
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26. A system for detecting an operating condition of a machine including a bearing associated with a shaft that rotates at a speed of rotation, the system comprising:
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a vibration sensor configured to detect mechanical vibrations responsive to the rotation of the shaft with respect to the bearing; an analog to digital converter configured to generate a digital measurement signal having amplitude sample values responsive to the detected mechanical vibrations so that said digital measurement signal includes a vibration signal signature; and one or more hardware processors configured to; generate a smoothened digital signal based on said digital measurement signal so that an output sample amplitude value is adjusted upwards in dependence on the amplitude of the corresponding input sample amplitude value and in dependence on the amplitudes of temporally adjacent input sample amplitude values; generate an asymmetrically filtered signal based on the smoothed digital signal so that a first settable filter value is set to a first value in response to a detected positive time derivative of the smoothened digital signal; and said first settable filter value is set to a second value in response to a detected negative time derivative of the smoothened digital signal; detect peak values in said asymmetrically filtered signal, and deliver output peak values based on said detected peak values.
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Specification