Vibration measurement apparatus and method
First Claim
1. A device for measuring vibration in an article having a rotating member, the device comprising:
- a motion sensitive transducer attachable to the article comprising an output producing a time domain analog signal in response to the vibration;
an analog-to-digital data acquisition member comprising an input connected to the transducer output for sampling the transducer signal and comprising an output producing a time domain digital signal from the sampling;
an optic sensor, responsive to a target feature on the rotating member, adapted to detect an instantaneous speed of the rotating member and trigger the data acquisition member to begin sampling when the rotating member is rotating; and
a processor comprising an input connected to the data acquisition member output for translating the time domain digital signal to a frequency domain digital signal and determining the magnitude and phase of said frequency domain digital signal at a frequency associated with the instantaneous speed of the rotating member.
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Accused Products
Abstract
An apparatus for measuring vibration in a article having a rotating member. A motion sensitive transducer produces a time domain analog signal in response to the vibration. An analog-to-digital data acquisition member samples the transducer signal and produces a time domain digital signal therefrom. A timing sensor is adapted to detect an instantaneous speed of the rotating member and preferably triggers the data acquisition member to begin sampling when the rotating member is rotating. A processor processes the time domain digital signal preferably by translation to a frequency domain digital signal and determination of the magnitude and phase of the frequency domain digital signal at a frequency associated with the instantaneous speed of the rotating member.
22 Citations
15 Claims
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1. A device for measuring vibration in an article having a rotating member, the device comprising:
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a motion sensitive transducer attachable to the article comprising an output producing a time domain analog signal in response to the vibration; an analog-to-digital data acquisition member comprising an input connected to the transducer output for sampling the transducer signal and comprising an output producing a time domain digital signal from the sampling; an optic sensor, responsive to a target feature on the rotating member, adapted to detect an instantaneous speed of the rotating member and trigger the data acquisition member to begin sampling when the rotating member is rotating; and a processor comprising an input connected to the data acquisition member output for translating the time domain digital signal to a frequency domain digital signal and determining the magnitude and phase of said frequency domain digital signal at a frequency associated with the instantaneous speed of the rotating member. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device comprising:
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a piezoelectric transducer which produces an analog signal in response to mechanical vibration of said transducer induced by a member rotated at an instantaneous speed less than an operational speed of said member; an analog-to-digital data acquisition member which samples the analog signal to produce a corresponding digital signal therefrom; a second transducer which detects said instantaneous speed of the rotating member; and a processor which processes the digital signal in relation to a frequency associated with said instantaneous speed. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification