Research On Design And Strength Analysis Of Marine Diesel Engine Bearing

Journal bearing is extensively used in marine diesel engines due to its lower noise, long life and high carrying capacity. As the key part of diesel engine, journal bearing has a decisive impact to the performance of the diesel engine. However, the research development of journal bearing in our country is relatively backward. We are lagging far behind in sectors as life, reliabilityand dynamic performance of journal bearing. And it has hindered a further development of the marine diesel engine. The research on design and strength analysis of marine diesel engine bearing has some vital guiding role on the research and development of diesel engine.The research work presented in this thesis can be summarized as follows:①Research actualities of design and analysis of diesel engine bearing is proposed. Design methodology of journal bearing is summarized. And an example for journal bearing design is done with the design methodology.②Fluid lubrication theory and oil film reformation are analyzed. Reynolds's equation is solved with the methodology of Holland, and the oil film pressure which acted on the journal bearing is conducted。③The finite element calculation model of journal bearing is founded. The distribution of radial stress, axial stress, shearing strength and strain are obtained. The effect of thickness of alloy layer and steel backing on stress-strain of journal bearing is analyzed.④Based on the theory of fatigue tests about journal bearing, fatigue analysis of tin-base bearing alloy is calculated with a finite elements software. Fatigue experimental investigation of tin-base bearing alloy is proposed in order to verify the correctness of theoretical analysis. .