8L250Diesel Engine Crankshaft Dynamics Simulation And Fatigue Analysis

The moving parts of the main diesel engine is the crankshaft, the crankshaft fatigue strength characteristics largely determine the reliability of the diesel engine work. Crank linkage at runtime between the different components will produce collisions, and the actual situation, the various components of the elastomer, elastomers by external force, a slight elastic deformation occurs, the interrelationship between the various components the force will be very complex, the analysis on institutional dynamics in the traditional classical mechanics has been difficult to meet the growing requirements of the calculation accuracy, the development of computer technology, the use of multi-body dynamics method to analyze the crank and connecting rod the mechanical strength of the interaction between the various components of the institution, so that the calculation accuracy has been greatly improved, and stress analysis and strength check of diesel engine crankshaft, piston and connecting rod and other moving parts to provide a more accurate reference.8L250-type diesel engine as the object of study in ADAMS multi-body dynamics of the diesel engine’s crankshaft, piston, connecting rod bodies dynamics simulation, and the crankshaft fatigue strength check.In order to achieve the above purpose, the main work done in this article:1) in the three-dimensional modeling software on the8L250diesel crankshaft linkage model and assembly;2) in MSC.PATRAN, MSC.NASTRAN finite element analysis software crankshaft modal finite element calculation to solve to get the natural frequencies and mode shapes of the crankshaft and generates neutral file includes a crankshaft modal analysis information;3) in the MSC.ADAMS dynamic simulation software to create multi-body dynamics model of the crank linkage, and the model dynamics simulation analysis to obtain the load force acting on the crankshaft;4) in the MSC.PATRAN, MSC.NASTRAN finite element analysis software, load the role of the load force of the crankshaft, and seek crankshaft at different phase angles at the stress distribution;5) Using the data obtained in the above work, check the fatigue strength of the crankshaft.