Method and a System for Monitoring the Condition and Operation of Periodically Moving Objects
First Claim
1. A method for monitoring the condition and operation of a periodically moving object, in which method a synchronized time average is calculated for a measurement signal that contains periodical variations and is obtained from the object, the method comprising:
- determining a frequency from the periodical variations of the measurement signal, said frequency corresponding within predetermined limits to a frequency estimated as the periodicity characteristic to the object to be measured,separating a signal component representing the determined frequency from the measurement signal by filtering, and the filtered signal is used as a synchronizing signal,dividing the measurement signal into sequences by means of the synchronizing signal, andcalculating the synchronized time average of the sequences.
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Abstract
A system and a method for calculating a synchronized time average for a measurement signal obtained from an object to be measured and containing periodical variations. In the method: from the periodical variations of the measurement signal a frequency is determined, said frequency corresponding within predetermined limits to a frequency estimated as the periodicity characteristic of the object to be measured; a signal component representing the determined frequency is separated from the measurement signal by filtering, and the filtered signal is used as a synchronizing signal, and the measurement signal is divided into sequences by means of the synchronizing signal, and the synchronized time average of the sequences is calculated. In an example of the method, the rotating frequency or the moving frequency of the object selected as the periodicity characteristic to the object.
6 Citations
19 Claims
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1. A method for monitoring the condition and operation of a periodically moving object, in which method a synchronized time average is calculated for a measurement signal that contains periodical variations and is obtained from the object, the method comprising:
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determining a frequency from the periodical variations of the measurement signal, said frequency corresponding within predetermined limits to a frequency estimated as the periodicity characteristic to the object to be measured, separating a signal component representing the determined frequency from the measurement signal by filtering, and the filtered signal is used as a synchronizing signal, dividing the measurement signal into sequences by means of the synchronizing signal, and calculating the synchronized time average of the sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for monitoring the condition and operation of periodically moving objects, comprising:
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a sensor for generating a measurement signal obtained from the object to be measured, said measurement signal containing periodical variations, and an analysing apparatus for calculating a synchronized time average, wherein the analysing apparatus is configured to; 1) determine from the periodical variations of the measurement signal a frequency that corresponds within predetermined limits to a frequency estimated as the periodicity characteristic to the object to be measured, 2) separate a signal component representing the determined frequency from the measurement signal by filtering, and to use the filtered signal as a synchronizing signal, and 3) divide the measurement signal into sequences by means of the synchronizing signal, and to calculate the synchronized time average of the sequences. - View Dependent Claims (11, 12, 13, 14)
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15. An analysing apparatus for monitoring the condition and operation of a periodically moving object, the analysing apparatus being configured to:
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calculate a synchronized time average based on a measurement signal obtained from the object to be measured, said measurement signal containing periodical variations, wherein the analysing apparatus is further configured to; 1) determine from the periodical variations of the measurement signal a frequency that corresponds within predetermined limits to a frequency estimated as the periodicity characteristic to the object to be measured, 2) separate a signal component representing the determined frequency from the measurement signal by filtering, and to use the filtered signal as a synchronizing signal, and 3) divide the measurement signal into sequences by means of the synchronizing signal, and to calculate the synchronized time average of the sequences. - View Dependent Claims (16, 17, 18, 19)
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Specification