Topology Optimization of 3D-printed joints under crash loads using Evolutionary Algorithms

Bujny, Mariusz; Olhofer, Markus; Aulig, Nikola; Duddeck, Fabian

doi:10.1007/s00158-021-03053-4

Cited by 14 publications

(2 citation statements)

References 92 publications

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“…Şahin Güngör 1* structures is still a crucial problem. At this point, additive manufacturing technologies enable us to get high-quality products having unique or unconventional structures [6,7]. As the product is created layer-by-layer, the final products need no more material removal process [8,9].…”

Section: Experimental Investigations On the Thermal Performance Of Ad...mentioning

confidence: 99%

Eklemeli imal edilmiş gözenekli topolojilerin ısıl performansı üzerine deneysel incelemeler

GÜNGÖR

2023

DEUFMD

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Additive manufacturing enables researchers to form unique and unconventional topologies satisfying design compactness, improved efficiency, and lower cost. Design freedom introduced by the additive manufacturing reveals the idea of implementing the topology optimization approach into thermal systems. In this study, changes in thermal performance of three types of topologies: gyroid, hexagon (honeycomb), and rectilinear are experimentally investigated. In addition, porosity level of each topology is varied in between 25%, 50% and 75% to improve the impact of the study. The experimental results indicate that gyroid structures are thermally more efficient (up to 15.6%) than the remaining topologies. Furthermore, thermal diffusivities of the rectilinear and gyroid topologies with 25% porosity level are measured as the extremes, and it is detected that these structures propagate heat 1.1 times greater than the hexagon structure.

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Section: Experimental Investigations On the Thermal Performance Of Ad...mentioning

confidence: 99%

Eklemeli imal edilmiş gözenekli topolojilerin ısıl performansı üzerine deneysel incelemeler

GÜNGÖR

2023

DEUFMD

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“…Compared with the variable density method, the ESO method lacks strict mathematical theory proof, and its universality, robustness, and numerical stability are inferior to those of the variable density method. Usually, reasonable parameters need to be set in order to obtain satisfactory results [13,14]. The level set method solves the Hamilton-Jacobi partial differential equation to obtain the level set function of the extended domain, and then obtains the topological configuration of the structure.…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization Design of an Active Deformable Mirror Based on Discrete Orthogonal Zernike Polynomials

et al. 2022

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In order to design an active deformation mirror for projection objective aberration imaging quality control, a topology optimization design method of active deformation mirrors based on discrete orthogonal Zernike polynomials is proposed in this paper. Firstly, in order to solve the problem that continuous Zernike polynomials do not have orthogonality on the discrete coordinates inside the unit circle, which causes the instability of topology optimization results, discrete orthogonal Zernike polynomials are used to characterize the active deformation mirror wave aberrations. Then, the optical and structural deformations are combined to establish an optical-mechanical coupling topology optimization model with the help of the variable density method to derive the sensitivity of the mathematical model. Finally, a wave aberration corrected deformation mirror in an optical machine system is used as an arithmetic example for topology optimization, and the results show that the absolute value of the Zernike coefficient Z4 after optimization is improved by nearly one order of magnitude compared with the value before optimization, and the vibration characteristics of the optimized structure meet the design requirements. The optimization effect is significant, which improves the optical performance of the deformed mirror and provides a new scheme for the design of the deformed mirror structure which has a certain practical value for engineering.

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Material‐Constrained Optimization of Liquid Crystal‐Based Holograms

Ropač,

Hsiao,

Berteloot

et al. 2024

Advanced Optical Materials

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A novel material‐constrained method for the design of liquid crystal optical devices – computer‐generated liquid crystal‐based holograms – and their manufacture using photo‐patterning is demonstrated. The developed topology optimization method is compared to the Gerchberg‐Saxton algorithm, and key advantages and disadvantages are outlined. The key novelties and advantages of the method are that it accounts for the natural relaxation and material properties of the liquid crystal and that it can account for different material or manufacturing constraints, such as maximum optical axis gradients. The viability of the method is applied for different binary and greyscale target images of varying complexity, target image sizes, and algorithms that account for the material properties of the liquid crystal. Finally, with the topology optimization design approach and photo‐patterning, it is possible to produce high‐accuracy and high‐contrast liquid crystal‐based computer‐generated holograms.

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Topology Optimization of 3D-printed joints under crash loads using Evolutionary Algorithms

Cited by 14 publications

References 92 publications

Eklemeli imal edilmiş gözenekli topolojilerin ısıl performansı üzerine deneysel incelemeler

Eklemeli imal edilmiş gözenekli topolojilerin ısıl performansı üzerine deneysel incelemeler

Topology Optimization Design of an Active Deformable Mirror Based on Discrete Orthogonal Zernike Polynomials

Material‐Constrained Optimization of Liquid Crystal‐Based Holograms

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