摘要
提出了离散截面变量空间桁架形状优化的一个两级算法.在第一级优化中,固定节点的位置,以杆件面积为设计变量,进行离散变量截面优化;在第二级优化中,以节点坐标为设计变量,同时考虑截面变化;形成一系列优化子问题,按目标函数下降方向用Fibonacci法搜索出各坐标设计变量的最优变动值,从而形成新的节点位置.两级优化交替进行,直到收敛为止.算例表明本方法简单,收敛平稳,优化效果较好.在算例中讨论了不同的节点坐标初值对优化结果的影响及产生原因.
A two-level algorithm is proposed for shape optimization of space trusses with dis-crete sizing variables.At the first level,the cross-sectional areas are chosen to be the design vati-ables and the discrete sizing optimization is carried out under fixed joint positions.At the secondlevel,joint ccordinates are treated as design variables with changing cross-sectional areas to forma series of sub-problems in which the Fibonacci method is employed in the descent direction of theobjective to work out the optimal change of each coordinate variable and obtain new joint coordi-nates.The two levels are executed in turn until convergence is reached.The examples show thatthe proposed algorithm converges smoothly and gives satisfactory solutions.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
1995年第1期10-16,共7页
Journal of Dalian University of Technology
基金
国家自然科学基金
关键词
空间桁架
形状
算法
最佳化
离散变量
space truss,shape,algorithm,optimization/discrete variable