Abstract
Analysis of harmonic parameters and detection of
foreign frequencies in diagnostic signals, which are most often
interpreted as fault results, may be problematic because of
the spectral leakage effect. When the signal contains only the
fundamental frequency and harmonics, it is possible to adjust
its spectral resolution to eliminate any distortions for regular
frequencies. The paper discusses the influence of resampling
distortions on the quality of spectral resolution optimization in
diagnostic signals, recorded digitally for objects in a steady state.
The method effectiveness is measured with the use of a synthetic
signal generated from an analog prototype whose parameters
are known. In order to achieve low values of harmonic amplitude
errors in the diagnostic signal, a high quality resampling
algorithm should be used, therefore the analysis of distortions
generated by four popular reasampling methods is performed.
Errors are measured for test signals containing different spectral
structures. Finally, the results of the test of the analyzed method
in practical applications are presented.
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