arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.01896cs.CEmath.OC
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一种有效的结构拓扑优化梯度投影方法

An Efficient Gradient Projection Method for Structural Topology Optimization

Zhi Zeng, Fulei Ma

摘要:

针对结构拓扑优化问题,提出了一种基于梯度投影的有效算法,该算法的目标函数为非线性,且在由双边界和线性等式约束定义的可行域上最小化。利用约束类型的特殊性以及启发式工程经验,改进了缩放方案、投影和搜索步骤。具体地说,该方法利用梯度裁剪和在一定条件下对搜索方向的投影进行修正来提高算法的效率。此外,提出了一种近似该投影的解析解,其计算和存储开销可以忽略不计。此外,搜索步骤的计算大大简化。基准问题,包括MBB,力逆变器机构,和三维悬臂梁被用来验证该方法的有效性。所提出的方法在MATLAB中实现,MATLAB是开源的,用于教育用途。

英文摘要:

This paper presents an efficient gradient projection-based method for structural topological optimization problems characterized by a nonlinear objective function which is minimized over a feasible region defined by bilateral bounds and a single linear equality constraint. The specialty of the constraints type, as well as heuristic engineering experiences are exploited to improve the scaling scheme, projection, and searching step. In detail, gradient clipping and a modified projection of searching direction under certain condition are utilized to facilitate the efficiency of the proposed method. Besides, an analytical solution is proposed to approximate this projection with negligible computation and memory costs. Furthermore, the calculation of searching steps is largely simplified. Benchmark problems, including the MBB, the force inverter mechanism, and the 3D cantilever beam are used to validate the effectiveness of the method. The proposed method is implemented in MATLAB which is open-sourced for educational usage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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