Dynamic implicit analysis of valve train with cylinder head assembly 2019-32-0584

Transient dynamic behaviour of the valve train system at constant engine speed is simulated with an implicit time integration method. The Interference fit between the valve guide, valve seat to cylinder head and preload between cam housing to cylinder head has been modelled as initial loads in the valve train. The cylinder head and cam housing have been modelled to consider the mounting stiffness on dynamics of the valve train. The temperature from steady-state CFD simulation has been mapped to the valve train, cylinder head and cam housing assembly. The expansion of the whole system has been considered, due to an increase in temperature. The cam has been rotated at specified engine speed for 360 degrees. The change in valve to guide clearance, Contact Pressure and Contact Status between valve to seat for both hot and cold condition has been compared and plotted from the simulation. Valve guide & valve seat distortion have been plotted to compare the cold and hot effects. The stress from the simulation has been used to predict the fatigue life of the valves.