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Monday, November 1, 2010

Based on CAD / CAE for the design of the engine crank

The engine crankshaft connecting rod is the most important of the two force components, the fatigue strength of engine reliability and safety is important. Complex structure of the crankshaft connecting rod, and improvement in the engine design process, a three-dimensional model needs to spend more time and intensity during the finite element analysis, the load is also more difficult to impose conditions. Secondary development of CAD technology and computer-aided engineering CAE, the application of parametric programming language, to create three-dimensional model convenient and fatigue strength of finite element analysis, shorten product development cycle, improve the competitiveness of products is important. First of all, this technology through research and secondary development of CAA CATIA secondary development principles, the use of secondary development tools provided by CATIA CAA, the analysis based on the structure of the crankshaft connecting rod, crankshaft connecting rod set up the parameters of the modeling system. Enter the crankshaft connecting rod through the main parameters that can quickly generate three-dimensional geometric model of the crankshaft connecting rod, crankshaft connecting rod to achieve a parametric modeling and local structure size changes. Secondly, through the establishment of secondary development of the geometric model of the crankshaft connecting rod, import, processing software Hypermesh carried out before the mesh, in order to get high-quality grid model, meshing, the use of high precision 10-node tetrahedron second unit solid187. Finally, the working process of the crankshaft connecting rod stress analysis, and make a reasonable simplification, the crankshaft and connecting rod to calculate the tension and compression conditions the force size.Parameters using ANSYS APDL language provided by the programming, the crankshaft connecting rod load and auto load the parameters of the solution, get the crankshaft connecting rod in tension and compression stress cloud conditions, to determine the dangerous point. And the fatigue strength of the crankshaft automatically solve the programming, fast solution of the crankshaft of the safety factor of each node; on the link to contact theory based on finite element analysis, the fatigue point of danger checking. Through this study, greatly simplifies the modeling of the crankshaft connecting rod and the finite element analysis for CAD / CAE integration and application of the reference application in the actual production of a certain significance.

Keywords: CAA; secondary development; parametric modeling; finite element analysis; fatigue strength

 

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