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Experimental study on combustion and vibration characteristics of low-speed marine diesel engine fuelled with biodiesel

Gang Wu, Yuan Yuhao, Jiang Guohe, Guo Hao, Zhang Zhe

Polish Maritime Research

2025

nr 3

154--162

This study, conducted on a six-cylinder low-speed marine diesel engine (MAN 6S35ME-B9) test bench, systematically investigates the effects of biodiesel-diesel blends (B10, B30, B50) on combustion and vibration characteristics for the first time, addressing a research gap in this area. Using multi-sensor synchronised acquisition of in-cylinder pressure and vibration signals, combined with time-domain (RMS), frequency-domain (FFT), and continuous wavelet transform (CWT) analysis, the research reveals the combustion mechanisms and vibration response characteristics of biodiesel. The results show that biodiesel’s high cetane number and oxygen content advanced the peak in-cylinder pressure, with the maximum pressure increasing as the blend ratio increased. However, its lower heating value caused higher brakespecific fuel consumption (BSFC) than D100 fuel. Vibration analysis indicated that biodiesel’s RMS values were generally higher than D100’s, especially in the 1.0-1.75 kHz mid-frequency band, which is closely related to combustion impacts. Vibration changes in the high-frequency band (1.9-2.5 kHz) might stem from knocking or mechanical impacts, with vibration characteristics showing nonlinear patterns across different blend ratios. This study’s application of the CWT method to low-speed engine vibration analysis offers theoretical and experimental support for optimising biodiesel use in ship power systems and new ideas for combustion state monitoring and fault diagnosis based on vibration signals.

Model matematyczny siły tarcia między pierścieniami tłokowymi a tuleją cylindrową wolnoobrotowego silnika okrętowego

Stachowiak M.

Zeszyty Naukowe / Wyższa Szkoła Morska w Szczecinie

2003

nr 71

393-402

Zadaniem pracy jest prezentacja matematycznego modelu siły tarcia między pierścieniami tłokowymi a tuleją cylindrową wolnoobrotowego silnika okrętowego, umożliwiającego uwzględnienie zjawiska tarcia przy wyznaczaniu ruchu silnika zarówno w stanie ustalonym, jak i nieustalonym.

The objective of this work is to develop a mathematical model for friction force between piston rings and cylinder liner in a marine low-speed diesel engine that allows including the effect of friction into the identification (computation) of engine motion in both stationary and dynamic operating conditions.