| Crankshaft is the most important component of diesel. It bears the force of connecting rod, and turns it into a torque on the output to drive the other attachments of diesel.Its performance directly influences the life of diesel. The force in the working process of crankshaft is complex, by centrifugal force of rotating mass, gas inertial force and reciprocating inertial force of cycle change work together, makes crankshaft under the action of bendable and torsional load. Therefore, it is very important to analyze the dynamic characteristics and strength, and evaluate the fatigue life of the crankshaft.In this paper, based on the 495 diesel engine crankshaft as the research object, through static analysis and dynamic simulation of the crankshaft, fatigue analysis and optimization design was carried out. First, using three-dimensional modeling software UG established the three-dimensional solid model of crankshaft and generated the connecting rod assembly model needed by ADAMS dynamics simulation. Secondly, using Hypermesh meshed of crankshaft and got the finite element model of the crankshaft. The finite element model of crankshaft was imported into ANSYS to do static analysis and free modal analysis in order to obtain the deformation value and the stress value under the condition of the maximum load, and the frequencies under the free modal. Meanwhile, the flexible body file of crankshaft was outputted. Then, utilizing dynamic simulation software ADAMS carried out rigid-flexible coupling dynamics simulation of crankshaft in order to get the load spectrum file of crankshaft movement. Finally, according to the finite element static analysis file, load spectrum file and material parameters, used n Code fatigue analysis software to establish the fatigue analysis model of crankshaft, got the fatigue life of crankshaft and dangerous points of fatigue damage. Lightweight optimization design of crankshaft by using ANSYS got the optimization scheme and validated the optimization results. |
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