Dynamic Analysis And Optimal Design For Crank-Link Mechanism Of Internal Combustion Engine

Inertia force of crank-link mechanism and piston side thrush is the main reason of engine vibration and damage, engine vibration will affect the comfortable and life span of vehicles. Thus the main problem in internal combustion engine design is decreasing these dynamic forces.Based on analysis of crank-link mechanism and Multi-Bodies Dynamic theory. This paper applies software Matlab compile calculated program of kinetic formula, drew the show power diagram and crank-link mechanism dynamic force of the S195 internal combustion engine. Build the virtual model of S195 diesel engine by using software Pro/E, and put the virtual model into ADAMS taking Multi-rigid dynamics simulation analysis, gained the dynamic force curve of every connect position relative to crank angle.Through analysis of simulation results,found the center mass of crank and linear eccentricity have big influence to piston side pressure and inertia force. Based on this analysis conclusion, optimized of the crank-link structure of S195 diesel engine. The maximum value of piston side pressure decreased 35% and mechanism inertia force decreased 22% after optimization.The simulation result also show that the mass replace method have computational error because ignored the inertia force of rod. At last, the paper propose take real Multi-Bodies dynamic simulation(consider flexible bodies in simulation research) and dynamic finite element analysis through combine ADAMS and ANSYS.The research displayed a convenience and highefficiency method of mechanical design. Will provided some experience for large-scale simulation research and dynamic finite element analysis in the future.