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Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373


FARIAS, Aline Cristina Mendes de; MEDEIROS, Alexandre Augusto Souza; OLIVEIRA JUNIOR, José Josemar de  and  ALVES, Salete Martins. Correlation Between Fuel Lubricity and Vibration Signals Obtained in Ball-disc Analysis Using Fourier Transform. Mat. Res. [online]. 2015, vol.18, suppl.2, pp.210-219.  Epub Nov 24, 2015. ISSN 1516-1439.

During the contact between metallic surfaces in mechanical systems, some dynamic characteristics present significant changes as the vibration signal patterns. The acquisition and characterization of these signals, by the use of Fourier Transform (FT), are non-intrusive tools in the evaluation of lubricity. This study aimed to evaluate dynamically the fuels lubricity (diesel S50, biodiesel and its blends) by the reciprocating sliding of a ball against a flat disc (AISI 52100 steel). After that, the vibration signals were evaluated by statistical test and FFT (Fast Fourier Transform) and STFT (Short-Time Fourier Transform) analyses and verified their associations with parameters supplied by ASTM D6079. The results present a correlation between lubricity, frequency spectrum and the parameters of profiles from the worn disc surface. In addition, the evolution of wear scars presented an influence of the biodiesel content in these fuels.

Keywords : lubricity; biodiesel; vibration signal; Fourier Transform; wear; AISI 52100 steel.

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