| Connecting rod and crankshaft are important components for hydraulic piston engine(HCPE). It is very effective to carry on structural analysis and optimization design for reliable efficient modern design goal.This paper analyzed the structural theory and the mechanical model of hydraulic piston engine, and briefly introduced the optimization theory of ANSYS. There were UG and ANSYS modeling approach on building three-dimensional model of connecting rod. The actual force and boundary conditions were studied. And, the stress and strain results of the maximum tension and compression in standard conditions have been made, which confirmed the optimization model of finite element analysis of connecting rod in ANSYS environment. Then, connecting rod quality as the objective function, fatigue, stiffness, stability as the constraints conditions, structural dimensions as the design variables, the optimal structure parameters were studied under the constraints conditions. After the optimization process, the connecting rod mass decreased by 35%. The final optimization mass was 0.50724kg, and the structure were more compact and rational.The assembly relationship between crankshaft and bearing was considered. The overall contact finite element model of crankshaft was established. The load conditions and boundary conditions of crankshaft were identified. Von Mises stress (equivalent stress), deformation, contact stress and friction stress in the maximum compression and tension conditions of each cylinder were gotten, which provided finite element model for crankshaft optimization design. Then, crankshaft quality as the objective function, fatigue, stiffness, contact stress, degree of overlap as the constraint conditions, structural dimensions as the design variables. After the optimal design, crankshaft mass decreased by 20%. The final optimization mass of crankshaft was 13.880kg, and stress and strain were to some degree increase. |
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