Portable vibration monitoring device
First Claim
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1. A portable vibration monitoring device, comprising:
- a portable housing;
a transducer which may be mounted to a machine under test, the transducer providing an output signal representative of the movement of the machine;
at least one integrator within the housing for processing the output signal to produce three measurands corresponding respectively to measured acceleration, velocity and displacement of the machine;
scaling circuitry within the housing for scaling levels of the three measurands relative to each other according to a predetermined relationship; and
a display exposed via the housing for displaying the scaled levels of the three measurands in a manner which is indicative of a particular frequency content of the output signal.
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Abstract
A portable vibration monitoring device which includes an accelerometer mounted on a machine to measure the vibration of the machine, and a display to display the results. The results are displayed, for example, on four bargraphs to indicate good/marginal/unacceptable vibration levels. Additionally, the bargraphs provide an indication of the type of problem resulting in high vibration levels. Examples of such problem types include, but are not limited to, machine imbalance, misalignment, and general fault conditions.
68 Citations
34 Claims
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1. A portable vibration monitoring device, comprising:
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a portable housing;
a transducer which may be mounted to a machine under test, the transducer providing an output signal representative of the movement of the machine;
at least one integrator within the housing for processing the output signal to produce three measurands corresponding respectively to measured acceleration, velocity and displacement of the machine;
scaling circuitry within the housing for scaling levels of the three measurands relative to each other according to a predetermined relationship; and
a display exposed via the housing for displaying the scaled levels of the three measurands in a manner which is indicative of a particular frequency content of the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
the scaled displacement measurand and the scaled velocity measurand being significantly higher than the scaled acceleration measurand and the scaled displacement measurand being equal or higher than the scaled velocity measurand, when the frequency of the controlling peak is located towards a low frequency band;
the scaled velocity measurand and the scaled acceleration measurand being greater than the scaled displacement measurand and the scaled acceleration measurand being less than or equal to the scaled velocity measurand, when the frequency of the controlling peak is located towards a mid frequency band; and
the scaled acceleration measurand and the scaled velocity measurand being significantly higher than the scaled displacement measurand and the scaled acceleration measurand being higher than the scaled velocity measurand when the frequency of the controlling peak is located towards a high frequency band.
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16. The device of claim 15, wherein the scaled displacement measurand and the scaled velocity measurand are the same when the frequency of the controlling peak is the same as the frequency of the machine.
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17. A portable vibration monitoring device, comprising:
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a portable housing;
a transducer which may be mounted to a machine under test, the transducer providing an output signal related to movement of the machine;
processing circuitry within the housing for deriving acceleration, velocity and displacement measurands based on the output signal;
scaling circuitry within the housing for scaling levels of the measurands relative to each other according to a predetermined relationship; and
a display exposed via the housing for displaying the scaled levels of the measurands in a manner which is indicative of a particular frequency content of the output signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
the scaled displacement measurand and the scaled velocity measurand being significantly higher than the scaled acceleration measurand and the scaled displacement measurand being equal or higher than the scaled velocity measurand, when the frequency of the controlling peak is located towards a low frequency band;
the scaled velocity measurand and the scaled acceleration measurand being greater than the scaled displacement measurand and the scaled acceleration measurand being less than or equal to the scaled velocity measurand, when the frequency of the controlling peak is located towards a mid frequency band; and
the scaled acceleration measurand and the scaled velocity measurand being significantly higher than the scaled displacement measurand and the scaled acceleration measurand being higher than the scaled velocity measurand when the frequency of the controlling peak is located towards a high frequency band.
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23. The device of claim 22, wherein the scaled displacement measurand and the scaled velocity measurand are the same when the frequency of the controlling peak is the same as the frequency of the machine.
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24. A portable vibration monitoring device, comprising a transducer which may be mounted to a machine under test and processing circuitry which processes an output signal provided from the transducer;
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wherein the processing circuitry derives acceleration, velocity and displacement measurands from the output signal, generates an estimate of frequency content based on overall acceleration, velocity and displacement level, and determines mechanical deficiencies of the machine based on the estimate of frequency content. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
the scaled displacement measurand and the scaled velocity measurand being significantly higher than the scaled acceleration measurand and the scaled displacement measurand being equal or higher than the scaled velocity measurand, when the frequency of the controlling peak is located towards a low frequency band;
the scaled velocity measurand and the scaled acceleration measurand being greater than the scaled displacement measurand and the scaled acceleration measurand being less than or equal to the scaled velocity measurand, when the frequency of the controlling peak is located towards a mid frequency band; and
the scaled acceleration measurand and the scaled velocity measurand being significantly higher than the scaled displacement measurand and the scaled acceleration measurand being higher than the scaled velocity measurand when the frequency of the controlling peak is located towards a high frequency band.
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31. The device of claim 30, wherein the scaled displacement measurand and the scaled velocity measurand are the same when the frequency of the controlling peak is the same as the frequency of the machine.
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32. A method of determining the condition of a machine, comprising:
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mounting a transducer to the machine to provide an output signal related to movement of the machine;
processing the output signal to derive acceleration, velocity and displacement measurands;
generating an estimate of frequency content based on overall acceleration, velocity and displacement level; and
determining mechanical deficiencies of the machine based on the estimate of frequency content. - View Dependent Claims (33, 34)
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Specification