Apparatus for diagnosing abnormalities in rotating machines
First Claim
1. An apparatus for diagnosing an abnormality which may occur in a rotating machine, which apparatus comprises a vibration detector for detecting vibrations generated by the rotating machinery and generating an electrical vibration signal indicative of the vibrations detected thereby;
- a bandpass filter unit capable of adjusting its passband in correspondence to the standard vibration of the rotating machinery;
an analog-to-digital converter for converting the analog signal which has passed through the filter unit, into a digital signal;
a digital frequency spectrum analyzer for calculating a frequency spectrum distribution on the basis of the digital signal supplied thereto;
a spectrum amplitude discriminator for selecting high amplitude values out from the frequency spectrum so calculated by the frequency spectrum analyzer;
a high spectrum amplitude detector operable for arithmetically processing data of the spectrum amplitude distribution approximating the frequency of the vibrations having the high amplitude values so selected by the spectrum amplitude discriminator to find the maximum possible amplitude of the vibration signal and also the frequency at which the maximum possible amplitude has been attained; and
a recorder for recording an output from the high spectrum amplitude detector.
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Accused Products
Abstract
A portalbe apparatus is disclosed for the diagnosis of a rotating machinery utilizing a fast Fourier transform frequency spectrum analysis system. The presence or absence of an abnormality or trouble in the rotating machinery is determined by selecting high amplitudes out from the frequency spectrum computed by the FFT frequency spectrum analysis system, arithmetically processing distribution data of spectrum amplitudes adjacent each frequency giving the corresponding high amplitude, and detecting the amplitude, at which the frequency of vibrations of the rotating machinery has attained a maximum value, together with such frequency. The diagnosis of the rotating machinery with this apparatus can be performed in situ, i.e., at the site of installation of such machinery.
122 Citations
10 Claims
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1. An apparatus for diagnosing an abnormality which may occur in a rotating machine, which apparatus comprises a vibration detector for detecting vibrations generated by the rotating machinery and generating an electrical vibration signal indicative of the vibrations detected thereby;
- a bandpass filter unit capable of adjusting its passband in correspondence to the standard vibration of the rotating machinery;
an analog-to-digital converter for converting the analog signal which has passed through the filter unit, into a digital signal;
a digital frequency spectrum analyzer for calculating a frequency spectrum distribution on the basis of the digital signal supplied thereto;
a spectrum amplitude discriminator for selecting high amplitude values out from the frequency spectrum so calculated by the frequency spectrum analyzer;
a high spectrum amplitude detector operable for arithmetically processing data of the spectrum amplitude distribution approximating the frequency of the vibrations having the high amplitude values so selected by the spectrum amplitude discriminator to find the maximum possible amplitude of the vibration signal and also the frequency at which the maximum possible amplitude has been attained; and
a recorder for recording an output from the high spectrum amplitude detector. - View Dependent Claims (2, 3, 4)
- a bandpass filter unit capable of adjusting its passband in correspondence to the standard vibration of the rotating machinery;
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5. An apparatus for detecting abnormalities in rotating machinery comprising:
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vibration detector means for detecting vibrations caused by the rotating machinery and generating electrical signals indicative of the detected vibrations; bandpass filter means through which said electrical signals are passed; analog-to-digital converter means for converting said electrical signals into digital signals; digital frequency spectrum analyzing means for calculating a frequency spectrum distribution from said digital signals; discriminator means for selecting high amplitude values from said frequency spectrum distribution; amplitude detector means for processing spectrum distribution data of frequencies within a range of that of said high amplitude value to select the maximum amplitude and the frequency at which it occurs; and recorder means for recording an output from said amplitude detector means. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification