Numerical simulation of connecting-rod mechanism coupled nonlinearly with engine block on marine diesel engine

To get the accurate boundary conditions of stress analysis of all components about diesel engine and structure borne noise analysis of engine block,the components of crankshaft and engine block were reduced by sub-structure finite element method and coupled by elastohydrodynamic lubrication and non-linear spring-damper connection.Analysis of flexible multi-body dynamics was performed,and the data of thrust force of crosshead glides,main bearing's load and response of block surface etc.were obtained.The results can be used to analyze transient intensity,fatigue,vibration of connecting-rod mechanism and engine block,structure borne noise of engine block as well as primary lubrication of bearings.It shows that the method can be used to study the interaction between the connecting rod mechanism and the whole engine block.