Integrated Casting Triangular Beam Lightweight Improving with Multi-performance Constraints of Body Systems
An optimization method of integrated casting structures was constructed systematical-ly,and based on the super-element model of body system,body casting part lightweight improving with multi-performance constraints was realized.Firstly,complex body systems were reduced,the sub-system division principle and method were proposed for continuous body structure.Super-element reduction of the sub-system was conducted to ensure analysis accuracy and improve calculation effi-ciency,laying the foundation for rapid optimization.Secondly,performances of casting structures and body systems were considered simultaneously,the compromise programming methods were used to normalize static and dynamic sub-targets and construct the comprehensive objective function,weight coefficients of sub-targets were obtained by analytic hierarchy process(AHP),and then multi-model topology optimization was carried out to determine position distribution of reinforcements.Further-more,designability and manufacturability were considered simultaneously,parametric definition of variable thickness drawing surface of casting structure was carried out,manufacturing constraints were applied during optimization processes,and then thickness parameter design was completed based on combined surrogate model.The results show that,under the premise of ensuring the analysis accu-racy,reduced body system models improve computing efficiency greatly,and save 97.3％of compu-ting resources.Casting triangular beam lightweight may be achieved while improving related perform-ance by conducting structure optimization,which indicates correctness and practicability of the pro-posed method.
万方数据
维普
