Engine Crank Rod System Dynamics Simulation And Fatigue Analysis

With the rapid development of automobile technology, people pay more and moreattention to driving safety. As one of the core components, the crankshaft of engine providestorque outward and work in poor conditions under the impact of complex cyclic loadingshock, therefore the crankshaft is the difficulty and keystone for the design of enginedevelopment. In the early stages of the design and development, the kinematic and dynamicanalysis for the crankshaft connecting rod mechanism of engine and the accurate calculationfor the stress, strain, modal, strength and fatigue of engine parts can significantly reduce theproduct development design time.This paper has carried on modeling and analysis for the crankshaft connecting rodmechanism of a V-shaped eight cylinder engine, established the3D model for the crankshaftconnecting rod mechanism of engine through the three-dimensional solid modeling softwarePro/E, and analyzed the kinematics and dynamics for many institutions in theory, it lay afoundation for further simulation analysis. This paper completed multi-rigid-body dynamicsanalysis for crankshaft connecting rod mechanism through Adams software, and obtained theresponse characteristics of engine crankshaft working condition and the correspondingboundary conditions. This paper also divided grid and analyzed the corresponding stress andstrain through HyperMesh and Ansys software, carried out modal analysis for the crankshaftthrough Ansys software. In addition, the papers extracted the crankshaft modal informationand neutral file with the block lanczos method, established the flexible body of crankshaft,carried out multi-flexible-body dynamics simulation analysis and multi-rigid-body dynamicssimulation in Adams software, and compared the two simulation results.Finally, this papercompleted the fatigue life analysis for crankshaft through MSC.Fatigue software, and foundthe crankshaft’s dangerous part in the working state.The research results show that though the analyze for the crankshaft connecting rodmechanism of engine based on finite element theory, multi-body dynamics theory and fatiguetheory, we can obtain accurate simulation results. It’s of great significance to providestheoretical foundation and scientific basis for the early stage of the vehicle enginedevelopment and design.