Analysis of vibroacoustic signals is one of the more frequently used mechanical devices diagnostic methods occurring among others in car diagnostics. Often, it happens that the most important element of the recorded course is the fundamental harmonic frequency of vibrations. Fundamental frequency indicates the main process related to the operation of the device and allows to follow its course. In the article the author's method of determining the fundamental frequency in the signal will be presented which is the subject of a patent application. Its theoretical basis and application examples were discussed comparing the accuracy of its use with the accuracy of other methods. The frequency range where the method finds application is shown. That is, where its accuracy turns out to be better than the accuracy of popular used methods to fundamental harmonic frequency determination.
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