Coupling Simulation of ICE Crankshaft System Dynamics and Dynamic Lubrication

The simulation model of crankshaft system dynamics and bearing oil film dynamic lubrication coupling for some V8 turbocharged diesel engine was built and was validated by experimental data.Through the coupling calculation,the torsional vibration angle displacement and resonance frequency of mass points and the bearing load,journal center loci,minimum film thickness,maximum oil film pressure and friction power loss parameters were acquired.The results show that the lubricity of the 5th main bearing(MB5) is the best and that of the 4th main bearing(MB4) is the worst.Compared with the simulation model without taking oil film dynamic lubrication into account,the new simulation model has more advantages.The torsional vibration angle displacement amplitude of engine free end reduces by 9% and the torsional vibration additional stress can decrease by 10.8% at the most.