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为提高油底壳的结构刚度,减轻质量,研究探讨了一种利用成熟CAD/CAE软件和多学科设计优化(MDO)平台进行内燃机部件结构优化设计的方法。利用iSIGHT、I-DEAS软件和VC++语言,构建了一套结构优化集成系统,实现了基于MDO技术的油底壳结构优化的整个仿真流程,并对程序控制的实体模型参数化修改、集成框架以及相关优化算法等进行了探讨。针对某型号柴油机油底壳,利用连续二次规划(NLPQL)算法,优化求得了结构参数全局最优解。实践结果表明:MDO技术应用于内燃机结构优化设计,是实用和可行的。
In order to improve the structural stiffness and reduce the quality of the oil pan, a method to optimize the structure of internal combustion engine components by using mature CAD / CAE software and multidisciplinary design optimization (MDO) platform is discussed. Using iSIGHT, I-DEAS software and VC ++ language, a set of structural optimization and integration system is constructed to realize the whole simulation process of the oil pan structure optimization based on MDO technology. The parametric modification of the entity model of the program control, integration framework, Related optimization algorithms were discussed. For a diesel engine oil sump of a certain type, the global optimal solution of structural parameters is optimized by using the continuous quadratic programming (NLPQL) algorithm. The practice results show that MDO technology is practical and feasible for the optimization design of internal combustion engine structure.