发动机舱盖的多学科设计优化方法

Multidiscipline design optimization method for engine hood

利用一种包含结构刚度、声-振-粗糙度(NVH)特性和行人保护性能等多个学科的自动计算流程,建立了一个用于发动机舱盖的优化设计方法。该流程借助隐式参数化方法,使用SFE Concept软件构建发动机舱盖参数化模型;以发动机舱盖内板纵梁位置等为变量,依托i Sight软件平台,调用仿真计算队列,基于多学科"试验设计(DOE)"统计样本计算结果,对发动机舱盖性能进行全局优化。结果表明:改进后的发动机舱盖,以较小的结构调整,使其按照新版中国新车评价规程(C-NCAP)的行人保护性能测试得分由7.42提升至7.72,优化效果明显。因而,该优化方法可用于发动机舱盖的正向多学科设计优化。

A design optimization method was established for engine hood with multidisciplinary automatic calculation process including structure rigidity,NVH(noise-vibration-harshness)performances and pedestrian protection performances.An engine hood parametric model was built to optimize globally the engine hood by using a SFE Concept software with an implicit parametric method,with taking the position of the inner longitudinal beam of the engine hood and others as variables,using an iSight software platform,and with calling a simulation queue,based on the result of multidisciplinary Design Of Experiment(DOE)sample calculation.The results show that the improved engine hood improves pedestrian protection performance score from7.42to7.72according to the China New Car Assessment Program(C-NCAP)due to some small structural adjustments to obtain obvious optimization.Therefore,the design optimization method can be applied to due to the engine hood forward multidiscipline design optimization.