摘要
薄壁加筋结构是航空航天领域常见的一种结构型式,这类结构的强度分析和优化设计广泛地受到关注。相比自行开发软件,合理地结合商业有限元软件的优势开展结构分析和优化设计更加简单实用,且易于飞机结构设计人员掌握。提出了一个基于MSC.Nastran和HyperWorks的完整的结构分析和优化设计流程。首先,在MSC.Nastran中进行整体结构的建模和分析,然后将隔框从整体结构中隔离出来,将MSC.Nastran分析得到的隔框边界节点的位移信息作为强制位移载荷施加给隔框,然后基于HyperWorks的优化模块对隔离出的隔框单独做优化分析和拓扑结构设计。该流程合理地结合了MSC.Nastran的结构分析功能和HyperWorks的优化功能,以薄壁圆筒隔框结构中隔框部分的拓扑优化为例详细说明了流程的全部细节,通过算例表明该结构分析和优化设计流程普遍适用于大型复杂结构的优化设计问题。
Thin-walled stiffened structures are ubiquitous in aerospace vehicles. The analysis and optimization of these structures is a recurrent theme in structural engineering. Performing this task through combination of commercial softwares rather than home-made codes will broaden the applicability and capability of computer-aided engineering for real purpose designs. We present an integrated strategy to carry out structural analysis and optimization by combining MSC. Nastran and Hyperworks. The overall structure was modeled and analyzed in MSC. NASTRAN. The stiffened ribs were isolated from the overall structure and performed a refined topology optimization in Hyperworks by enforcing displacement boundary conditions extracted from NASTRAN analysis. The powerfullness of structral analysis of NASTRAN and structural optimization of Hyperworks is thus merged to give this integrated approach. A long stiffened cylinder with longitudinal ribs were chosen as an example to detail the procedure, but the approach is versatile and can be developed for more complicated aerospace structures.
出处
《强度与环境》
2015年第4期35-39,共5页
Structure & Environment Engineering
