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 response, the method comprising:
- determining a frequency response from the periodical variations of the measurement signal, said frequency response corresponding within predetermined limits to a frequency estimated as the periodicity characteristic to the object measurement,separating a signal component representing the determined frequency response 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 method for monitoring a condition and an operation of a periodically moving object is provided. Herein a synchronized time average is calculated for a measurement signal, the signal containing periodical variations and obtained from the object response. In general, a frequency response is determined based on the periodical variations of the measurement signal. A signal component representing the determined frequency response is filtered from the measurement signal. The filtered signal is used as a synchronizing signal. A synchronized time average of sequences, determined by dividing the measurement signal by the synchronizing signal, is calculated.
21 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 response, the method comprising:
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determining a frequency response from the periodical variations of the measurement signal, said frequency response corresponding within predetermined limits to a frequency estimated as the periodicity characteristic to the object measurement, separating a signal component representing the determined frequency response 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 response that corresponds within predetermined limits to a frequency estimated as the periodicity characteristic to the object measurement response, 2) separate a signal component representing the determined frequency response from the measurement signal by filtering, and using 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 measurement, 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 response that corresponds within predetermined limits to a frequency estimated as the periodicity characteristic to the object measurement, 2) separate a signal component representing the determined frequency response from the measurement signal by filtering, and using 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