Preliminary communication

https://doi.org/10.17559/TV-20190319110231

An Overview and Efficiency Analysis of Dominant Frequencies Estimation Methods with the Application of DIRECT Global Minimization Method

Katarina Pisačić* orcid.org/0000-0002-9425-3708 ; University North, University center Varaždin, 104. brigade 3, 42000 Varaždin, Croatia
Zlatko Botak ; University North, University center Varaždin, 104. brigade 3, 42000 Varaždin, Croatia
Marko Horvat ; University North, University center Varaždin, 104. brigade 3, 42000 Varaždin, Croatia

Abstract

This report discusses the application of the following methods that are used to calculate maximum frequency of a spectrum: parabolic, modified parabolic by Rife and Vincent, the method according to Quinn from 1994 and the method according to Quinn from 1997. After introducing DIRECT global minimization method, the results obtained using previously mentioned methods are compared with the results obtained using DIRECT global minimization of the Lipschitz function. Determining vibration frequency and comparing to previously collected data or knowledge base data is a common procedure. In engineering practice it is often necessary to determine not one, but several so-called dominant frequencies or local maxima; the procedure is sometimes called multi peak detection and here we propose an algorithm for computerised multi peak detection.

Keywords

DFT, Discrete Fourier transformation, DIRECT global minimization, dominant frequency, Lipschitz, multi peak detection, spectral analysis, vibration

Hrčak ID:

244864

URI

https://hrcak.srce.hr/244864

Publication date:

17.10.2020.

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