Journal of Siberian Federal University. Engineering & Technologies / Vibration Parameters Study of Ship Structures Using Wavelet Analysis of Vibrogram

Full text (.pdf)
Issue
Journal of Siberian Federal University. Engineering & Technologies. 2021 14 (3)
Authors
Starodubtsev, Pavel A.; Dorofeev, Grigory V.; Lipovetskiy, Andrey O.
Contact information
Starodubtsev, Pavel A.: Pacific Higher Naval School named after S. O. Makarov Vladivostok, Russian Federation; ; Dorofeev, Grigory V.: Pacific Higher Naval School named after S. O. Makarov Vladivostok, Russian Federation; Lipovetskiy, Andrey O.: Pacific Higher Naval School named after S. O. Makarov Vladivostok, Russian Federation
Keywords
vibration; Fourier Transform; wavelet functions; time wavelet analysis; frequency wavelet analysis; spectral characteristics of vibration displacements
Abstract

The study of the vibration parameters of ship structures is important for developing measures to ensure their reliable operation on ships. The commonly used analysis of vibrograms using the Continuous Fourier Transform (CFT) to accurately represent non-stationary functions in general and noise source signals in particular is unsuitable due to a number of drawbacks. The problems of spectral analysis and time-limited signal synthesis can be partially solved by switching to the Window Fourier Transform (WFT). The disadvantage of the WFT is that its calculation uses a fixed window, which cannot be adapted to the local properties of the signal. In order to get rid of this shortcoming for the analysis of vibrogram you can use wavelet transform. It also solves a number of other problems related to the processing of a noise signal. The word “wavelet” means small waves following each other (some sources have introduced the concept of “splash”). In a narrow sense, wavelets are a family of functions obtained by scaling and shifting a single, parent function. In a broad sense, wavelets are functions with frequency localization, whose average value is zero. The article shows the signs of a wavelet. Examples of the most common wavelet functions are given. The use of wavelet functions is proposed not only on the basis of time, but also frequency transformations. The implementation of the algorithm for analyzing vibration measurement data is proposed. An example of vibration measurement data and the results of their processing based on frequency wavelet analysis are given

Pages
292–305
DOI
10.17516/1999-494X-0307
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/141279

Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).