Topology optimization of binary structures using Integer Linear Programming
This work proposes an improved method for gradient-based topology optimization in a discrete setting of design variables. The method combines the features of BESO developed by Huang and Xie [1] and the discrete topology optimization method of Svanberg and Werme [2] to improve the effectiveness of bi...
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| Vydáno v: | Finite elements in analysis and design Ročník 139; s. 49 - 61 |
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| Hlavní autoři: | , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
Amsterdam
Elsevier B.V
01.02.2018
Elsevier BV |
| Témata: | |
| ISSN: | 0168-874X, 1872-6925 |
| On-line přístup: | Získat plný text |
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| Shrnutí: | This work proposes an improved method for gradient-based topology optimization in a discrete setting of design variables. The method combines the features of BESO developed by Huang and Xie [1] and the discrete topology optimization method of Svanberg and Werme [2] to improve the effectiveness of binary variable optimization. Herein the objective and constraint functions are sequentially linearized using Taylor's first order approximation, similarly as carried out in [2]. Integer Linear Programming (ILP) is used to compute globally optimal solutions for these linear optimization problems, allowing the method to accommodate any type of constraints explicitly, without the need for any Lagrange multipliers or thresholds for sensitivities (like the modern BESO [1]), or heuristics (like the early ESO/BESO methods [3]). In the linearized problems, the constraint targets are relaxed so as to allow only small changes in topology during an update and to ensure the existence of feasible solutions for the ILP. This process of relaxing the constraints and updating the design variables by using ILP is repeated until convergence. The proposed method does not require any gradual refinement of mesh, unlike in [2] and the sensitivities every iteration are smoothened by using the mesh-independent BESO filter. Few examples of compliance minimization are shown to demonstrate that mathematical programming yields similar results as that of BESO for volume-constrained problems. Some examples of volume minimization subject to a compliance constraint are presented to demonstrate the effectiveness of the method in dealing with a non-volume constraint. Volume minimization with a compliance constraint in the case of design-dependent fluid pressure loading is also presented using the proposed method. An example is presented to show the effectiveness of the method in dealing with displacement constraints. The results signify that the method can be used for topology optimization problems involving non-volume constraints without the use of heuristics, Lagrange multipliers and hierarchical mesh refinement.
•A method is proposed for topology optimization of binary structures, combining the features of sensitivity analysis and mesh-independent filtering of the modern BESO method developed by Huang and Xie [1] and the sequential integer linear programming for discrete topology optimization developed by Svanberg and Werme [2].•The method is general and can treat the non-volume constraints explicitly without using Lagrange multipliers.•The method is based on mathematical programming and thus sensitivity number sorting and thresholds are not used for updating the design variables.•BESO filter is used for sensitivity smoothening, and fine meshes are directly used for topology optimization, unlike [2] where gradual refinement of mesh was required. |
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| Bibliografie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 |
| ISSN: | 0168-874X 1872-6925 |
| DOI: | 10.1016/j.finel.2017.10.006 |