Numerical Analysis and Study of Crankshaft System Hydrodynamic Lubrication and Dynamic Coupling System

Using finite element method and multi-body dynamics method, this study established an engine digitalized virtual prototype embraced tribological characteristics in virtual prototype and MATLAB platform, and introduced Elastohydrodynamics theory into the system, wrote program with difference equation method, and solved the Reynolds Equation through shafting-bearing self-feedback control system, obtained the crankshaft main bearing reaction force which considered the system’s oil film dynamic lubricating friction behaviour, and also obtained data of main bearing’s load capacity, path of axle center and the minimum thickness of oil film. Though analysis, it is found that engine crankshaft system’s oil film dynamic lubricating friction has certain impact on system’s dynamic characteristics, where using hydrodynamic lubrication coupling multi-body dynamic system for simulation could better reflect the engine’s actual working conditions, therefore the oil film dynamic lubricating friction behaviour of the system should be considered in dynamic simulation calculations.