3-D Transient Dynamic Stress Numerical Simulation And Study Of Crank-Linkage Mechanism

The characteristics and reliability of engine is directly affected by the crankshaft connecting rod mechanism, which is therefore one of the most important mechanisms in engine. With the development towards higher speed, larger power, and heavier load, the working environment of internal combustion engine is getting increasingly bad. The dynamic characteristics of crankshaft connecting rod mechanism should be studied to analyze the kinetics, interactive force, and stress distribution and deformation of moving components, which will provide valuable reference data for the design and optimization of engine component structure.CUB100 engine was studied in this thesis, and the changing pattern of cylinder pressure with crankshaft angle was tested under rated working condition. The three dimensional(3-D) finite element models of piston, connecting rod, and crankshaft were established respectively based on static analysis, and meanwhile, the 3-D quasistatic stress distribution and deformation were calculated by numerical simulation. As demonstrated by the calculation result, the strength of mechanism was evaluated and improvement advice was proposed.The static simulation model of crankshaft connecting rod mechanism was established by defining the connecting relationship of component on the basis of static finite element analysis, and the 3-D transient stress distribution and deformation was obtained by numerical simulation. The cloud picture of stress distribution and static calculation under selected crankshaft angles were compared to analyze the difference and cause. As indicated by the analysis result, the dynamic simulation was more reasonable and accurate than static simulation.