Method and apparatus for testing the condition of a machine专利检索-频谱分析仪信号处理专利检索查询-专利查询网

Method and apparatus for testing the condition of a machine

阅读：953发布：2021-12-17

专利汇可以提供Method and apparatus for testing the condition of a machine专利检索，专利查询，专利分析的服务。并且The vibrational components over a frequency spectrum of interest developed by a machine are transformed into electrical signals by means of a transducer such as an accelerometer, and these electrical signals in turn are processed by means of a spectrum analyzer to provide a power spectral density plot thereof. The peak amplitude of the signals in a pair of preselected frequency bands is then detected and the ratio between these two signals determined. This ratio is then compared against a value representing an acceptable ratio experimentally or theoretically derived to determine whether the measured ratio is within acceptable tolerances for the machine. The bands utilized are preferably a first band within a high frequency vibrational range, and a second band lower in frequency than this first band with the signals in these bands being of medium amplitude relative to all of the signals developed in the spectral analysis.，下面是Method and apparatus for testing the condition of a machine专利的具体信息内容。

权利要求

1. A method for evaluating the condition of a machine having moving parts therein comprising the steps of: setting the machine in operation, generating an electrical output in accordance with the vibrational signals developed in the machine, converting said vibrational output to the form of a power spectral density plot wherein the frequency components thereof appear against a time base, generating signals in accordance with the peak amplitude of the signals in a first predetermined high frequency band of the signal components, generating a second signal in accordance with the peak amplitude of the signals in a second predetermined band lower in frequency than said first band, and measuring the ratio of the amplitudes of the two peak signals, said ratio being indicative of the condition of the machine.

2. The method of claim 1 wherein an electrical signal is generated in accordance with the acceleration of the vibrational components developed in the machine.

3. The method of claim 1 and additionally including the step of comparing the ratio with a reference level and generating a ''''NO-GO'''' signal when the measured ratio exceeds said reference level.

4. The method of claim 1 wherein the peak amplitude of the signals in said predetermined frequency bands are between 0.1 percent and 10 percent of the peak signal in the entire spectral density plot.

5. The method of claim 1 wherein the vibrational components in both of said predetermined frequency bands represent intermodulation components of the vibration developed in the machine.

6. The method of claim 1 wherein the steps set forth therein are first utilized to determine a reference ratio which is used as a standard ratio which is compared with subsequent measurements in accordance with the steps set forth therein.

7. Apparatus for testing the condition of a machine comprising: means for generating an electrical signal in accordance with the vibrational output of said machine, spectrum analyzer means responsive to said vibrational output for converting said output to the form of a spectral density plot, first and second gating means for receiving the output of said spectrum aNalyzer means, means synchronized with the scan of said spectrum analyzer means for gating the signals in a first frequency band through said first gating means, means synchronized with the scan of said spectrum analyzer means for gating the signals in a second frequency band lower in frequency than said first band through said second gating means, first and second peak detector means for receiving the outputs of said first and second gating means respectively and providing outputs in accordance with the peak amplitudes thereof, and means for generating a signal in accordance with the ratio between the outputs of said peak detectors.

8. The apparatus of claim 7 and further including threshold detector means for receiving the ratio signal and generating an output when said ratio exceeds a predetermined value and indicator means for producing an indicating signal in response to the output of the threshold detector means.

9. The apparatus of claim 7 wherein said means for generating an electrical signal in accordance with vibrational output comprises an accelerometer.

10. The apparatus of claim 7 wherein said means for gating said signals through said gating means comprises delay and pulse forming circuits.

11. The apparatus of claim 7 wherein said means for generating a signal in accordance with the ratio comprises logarithmic amplifiers for logarithmically amplifying the outputs of said peak detectors, summing means for generating a signal in accordance with the difference of the outputs of said logarithmic amplifiers, and an anti-logarithmic amplifier for converting the output of said summing means to its linear equivalent.

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