飞行器板筋结构优化设计的试验验证及分析

针对国内在结构拓扑优化上理论研究多、实验验证少的现状, 采用"敏度阈值" 等优化手段获得"创新结构", 并重点开展了传统与创新结构的试验对比与分析工作. 试验结果与数值仿真不仅具有良好的一致性, 而且还得到创新结构比传统结构刚度大(10%~30%), 应力低(10%~20%) 的结果, 运用"结构能量" 概念和能量原理给出了合理的解释. 对比试验不仅验证了敏度阈值等优化技术可以获得创新结构, 也为结构拓扑优化推广应用提供了宝贵的试验支撑.

EXPERIMENT AND ANALYSIS OF OPTIMIZATION DESIGN ON PLATE-RIB STRUCTURE OF AIRCRAFT

There were many theoretical studies but few experimental demonstrations in the structural topology optimization (STO) field. In order to promote the technology of STO in the aeronautical engineering, this paper proposes to use the ‘sensitive threshold'(ST) approach to obtain an ‘innovative structure' and to make test comparisons and analyses of conventional and innovative structures. From the test results, not only a good consistency can be seen as compared with the numerical calculation, but also some findings are made that the stiffness is increased (by more than 10%~30%) and the stresses are lower (less than 10%~20%) for the innovative structure. By using the concept of the ‘structural energy' and the principle of energy, a reasonable explanation of the previous phenomena is made. The comparison tests also demonstrate that the ST approach can obtain the invocative structure effectively, meanwhile, provide precious test support data as well for the application of STO.