Wpływ zakłóceń resamplingu na jakość procesu optymalizacji widmowej rozdzielczości sygnałów w akustycznej diagnostyce samochodowych silników spalinowych
Journal Title: Autobusy. Technika, Eksploatacja, Systemy Transportowe - Year 2017, Vol 208, Issue 6
Abstract
The paper discussed influence of resampling distortions on quality optimization of spectral resolution in acoustic diagnostics of car engines. The purpose of mentioned process is to obtain clear spectrum structure which can then be used to evaluate the fuel mixture combustion, wear of engine components, fault detection, etc. Using signal of finite length for computing its spectrum causes some deviations in spectrum structure. It can be the reason for misinterpretation because of frequencies occurring in DFT array, which in fact do not exist in the signal and existing frequencies, which have incorrect amplitude. To reduce this effect, the window function can be used. Taking into consideration the special spectral structure of diagnostic signals, it is possible to adjust parameters of signals in such a way to eliminate any distortion for regular frequencies. Then, foreign frequencies can be interpreted with high probability as an effect of anomaly in the examined object.
Authors and Affiliations
Marcin Jarmołowicz, Eugeniusz Kornatowski
Keywords
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- EP ID EP282155
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