Dynamic Simulation Of Crank Train System Based On LS-DYNA Software

The crank train is the most important part of internal combustion engine. The dynamicsof crank train were investigated mainly by the force analysis method of particle system andrigid multi-body dynamics method in the past yet the force analysis method of particle systemis too simple and the force condition can not be fully reflected in rigid multi-body dynamicsbecause all the parts of crank train were considered as rigid bodies by this method. In thisarticle the kinematics and dynamics of TBD620single cylinder diesel engine are studiedusing ANSYS/LS-DYNA software based on flexible multi-body dynamics to get the factors tothe crank train dynamics and the force condition of the crank train.This article mainly includes the followings:1. Firstly, the kinematics and dynamics of TBD620single cylinder diesel engine arecalculated by the force analysis method of particle system to get the theoretical solutions.Secondly, the solid model (crank, piston, cylinder, connecting rod, bushing and bearing) ofTBD620single cylinder diesel engine is set up in LS-DYNA software and the related systemparameters are studied.2. The factors affecting the secondary motion of piston are studied, including speed ofthe crank shaft, shape of the piston, clearance between the piston and the cylinder. And on thisbasis, the behavior that the motion of connecting rod is affected by the speed of crank shaftand clearance between the piston and the connecting rod is also studied.3. The load characteristics of crank train and stress distribution condition are studied atrated speed. The results show that the piston load mainly focuses on the top of piston and thepiston pin; the tensile stresses concentrated in the connecting rod mainly lie in the connectingrod body. The results provide a basis for the internal combustion engine design and a newapproach for the diesel engine simulation.