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Wyszukujesz frazę "topology optimization" wg kryterium: Temat


Tytuł:
Zastosowanie optymalizacji topologicznej w projektowaniu konstrukcji żelbetowych z wykorzystaniem modeli "Strut and Tie"
Applications of truss topology optimization in the design of reinforced concrete structures using „Strut and Tie” models
Autorzy:
Bołbotowski, K
Knauff, M
Sokół, T.
Powiązania:
https://bibliotekanauki.pl/articles/390290.pdf
Data publikacji:
2013
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
modele Strut and Tie
konstrukcje żelbetowe
projektowanie według Eurokodu 2
naroże ramy
optymalizacja topologiczna
kratownice Michella
Strut and Tie models
reinforced concrete structures
Eurocode 2 design
frame corner
topology optimization
Michell’s structures
Opis:
Poglądowa, oparta na analizie kratownic idea modeli Strut and Tie sprawia, że są one często stosowane w praktyce. Zbudowanie modelu dobrze zgadzającego się z rzeczywistą pracą konstrukcji czasem bywa trudnym zadaniem. Tak np. rozpatrzony w referacie model naroża ramy przedstawiony w normie [7] i w pracy [8] może budzić zastrzeżenia. W niniejszej pracy zaproponowano metodę generowania modeli ST przy użyciu optymalizacji topologii kratownicy, rozpatrując zagadnienie minimalizacji objętości prętów rozciąganych modelu. Stworzono oprogramowanie wykorzystujące algorytm konstrukcji bazowej, w którym wprowadzono pewien sposób uwzględniania kosztu węzłów, co pozwoliło na uzyskiwanie optymalnych kratownic o racjonalnie małej liczbie prętów (w odróżnieniu od konstrukcji Michella). Dodatkowo zaimplementowano algorytmy pozwalające spełnić odpowiednie wytyczne Eurokodu 2. Korzystając z oprogramowania zaproponowano alternatywę dla modelu naroża ramy z tejże normy uzyskując znaczne oszczędności stali zbrojeniowej. Dzięki programowi rozwiązano także szereg innych płaskich zagadnień z dziedziny konstrukcji żelbetowych.
Although Strut and Tie models are often used in practical design due to their apparent concept based on truss analysis, the creation of a model consistent with behaviour of the real structure is not an easy task. Frame corner model considered in the paper and presented in code [7] and article [8] exemplifies the problem. The authors proposed a method of automatic generating of ST models by making use of truss topology optimization (volume minimization problem). The method is based on classical ground structure approach. The authors introduced a method of including the cost of nodes in the objective function, which allowed to obtain solutions consisting of rationally small number of bars (unlike Michell’s structures). Moreover, algorithms ensuring consistency with Eurocode requirements were developed. The method was implemented in computer program. With the use of the software the authors proposed an alternative ST model for the frame corner, which requires considerably less reinforcement steel in comparison with the model suggested by the code. The versatility of the program was well proven in several other examples of plane stress problems in reinforced concrete design.
Źródło:
Budownictwo i Architektura; 2013, 12, 1; 91-98
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration reduction design with hybrid structures and topology optimization
Autorzy:
Huo, F.
Yang, D.
Zhao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/260590.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hybrid structure
vibration reduction
materials selection
topology optimization
Opis:
The hybrid structures show excellent performance on vibration reduction for ship, aircraft and spacecraft designs. Meanwhile, the topology optimization is widely used for structure vibration reduction and weight control. The design of hybrid structures considering simultaneous materials selection and topology optimization are big challenges in theoretical study and engineering applications. In this paper, according to the proposed laminate component method (LCM) and solid isotropic microstructure with penalty (SIMP) method, the mathematical formulations are presented for concurrent materials selection and topology optimizations of hybrid structures. Thickness distributions of the plies in laminate components are defined as materials selection design variables by LCM method. Relative densities of elements in the components are defined as topology design variables by SIMP method. Design examples of hybrid 3-bar truss structures and hybrid floating raft with vibration reduction requirements verified the effectiveness of the presented optimization models.
Źródło:
Polish Maritime Research; 2016, S 1; 10-19
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-stage optimization method with fatigue constraints for thin-walled structures
Dwuetapowa metoda optymalizacji konstrukcji cienkościennych z ograniczeniami zmęczeniowym
Autorzy:
Mrzygłód, M.
Powiązania:
https://bibliotekanauki.pl/articles/279981.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin-walled structures
fatigues constraints
topology optimization
Opis:
The paper describes a two-stage approach to optimization of thin-walled structures. The optimization procedure takes into consideration highcycle fatigue constraints. Hence, Dang Van's criterion for fatigue damage estimation is used. In the first stage of optimization, a parametric model and evolutionary algorithms are used. The topology optimization method is applied in the second stage. The work is illustrated by an example of optimization of a thin-walled mechanical structure subjected to high-cycle load conditions. In both stages of the optimization, the same parametric FE model, boundary conditions and constraints were used. The topology optimization applied in the second stage of optimization significantly improved the final result. The optimization methodology allowed to effectively lower the mass of the structure maintaining its durability on an established level.
Artykuł opisuje dwuetapowe podejście do optymalizacji konstrukcji cienkościennych uwzględniające wysoko-cyklowe ograniczenia zmęczeniowe. Do oszacowania uszkodzenia zmęczeniowych w procedurze optymalizacyjnej użyto hipotezy Dang Van'a. W pierwszym etapie optymalizacji został zastosowany model parametryczny oraz algorytmy ewolucyjne. W etapie drugim wykorzystano metodę optymalizacji topologicznej. Działanie algorytmu optymalizacyjnej zilustrowana na przykładzie cienkościennej konstrukcji mechanicznej poddanej wysoko-cyklowemu reżimowi obciążeń. Dla obu etapów optymalizacji użyto tego samego model parametrycznego MES oraz takich samych warunków brzegowych i ograniczeń. Zauważono, że zastosowana w drugim etapie optymalizacja topologiczna znacząco poprawiła końcową wartość funkcji celu. Zaprezentowana w pracy metodyka optymalizacyjna pozwoliła skutecznie obniżyć masę konstrukcji, utrzymując jej trwałość zmęczeniową na założonym poziomie.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 3; 567-578
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards an Optimal Motor Mounting Bracket Using Topology Optimization Combined with Sustainability and Manufacturing Cost Analysis
Autorzy:
Fassi, Hicham Fihri
Aniyou, Hadji
Powiązania:
https://bibliotekanauki.pl/articles/27324206.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
engine mount
topology optimization
numerical simulation
sustainability
manufacturing
costing analysis
Opis:
The engine is the most important component of a vehicle. It attaches to the main frame via the engine mounting bracket which supports weight and operating loads. The engine mount therefore plays a crucial role in the durability and comfort of the vehicle. This article contributes to the search for the most optimal model from the point of view of resistance, environmental impact, and manufacturing cost. This involves, on the one hand, optimizing the support by reducing its initial mass by 30%, and on the other hand, seeking suitable material and manufacturing process with the least environmental impact. To this end, topology optimization will be combined with an environmental assessment and a manufacturing cost analysis. Four materials will be tested and evaluated. Finally, a cost analysis will present a comparison between a conventional process and 3D printing.
Źródło:
Management and Production Engineering Review; 2023, 14, 4; 109--116
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization without volume constraint – the new paradigm for lightweight design
Autorzy:
Nowak, Michał
Boguszewski, Aron
Powiązania:
https://bibliotekanauki.pl/articles/2086857.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
topology optimization
lightweight design
biomimetic structural optimization
optymalizacja topologii
konstrukcja lekka
biomimetyczna optymalizacja strukturalna
Opis:
In the paper the new paradigm for structural optimization without volume constraint is presented. Since the problem of stiffest design (compliance minimization) has no solution without additional assumptions, usually the volume of the material in the design domain is limited. The biomimetic approach, based on trabecular bone remodeling phenomenon is used to eliminate the volume constraint from the topology optimization procedure. Instead of the volume constraint, the Lagrange multiplier is assumed to have a constant value during the whole optimization procedure. Well known MATLAB topology based optimization code, developed by Ole Sigmund, was used as a tool for the new approach testing. The code was modified and the comparison of the original and the modified optimization algorithm is also presented. With the use of the new optimization paradigm, it is possible to minimize the compliance by obtaining different topologies for different materials. It is also possible to obtain different topologies for different load magnitudes. Both features of the presented approach are crucial for the design of lightweight structures, allowing the actual weight of the structure to be minimized. The final volume is not assumed at the beginning of the optimization process (no material volume constraint), but depends on the material’s properties and the forces acting upon the structure. The cantilever beam example, the classical problem in topology optimization is used to illustrate the presented approach.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137732, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization of systems governed by variational inequalities
Autorzy:
Myśliński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/729259.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
variational inequality
topology optimization
Opis:
This paper deals with the formulation of the necessary optimality condition for a topology optimization problem of an elastic body in unilateral contact with a rigid foundation. In the contact problem of Tresca, a given friction is governed by an elliptic variational inequality of the second order. The optimization problem consists in finding such topology of the domain occupied by the body that the normal contact stress along the contact boundary of the body is minimized. The topological derivative of the cost functional is calculated and a necessary optimality condition is formulated. The calculated topological derivative is also used in the numerical algorithm to find a descent direction by inserting voids in the domain occupied by the body. Numerical examples are provided.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2010, 30, 2; 237-252
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization of structures with stress and additive manufacturing constraints
Autorzy:
Fiuk, Grzegorz
Mrzygłód, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/1839646.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
topology optimization
manufacturing constraint
additive manufacturing
Opis:
The paper presents a new methodology dedicated to design for additive manufacturing. Based on a hybrid algorithm of topological optimization, the method enables application of advanced constraints and validates solutions “on the fly” using virtual prototyping. Advanced constraints consider the influence of directions of additive manufacturing as well as the equivalent stress. In the optimization framework, real material properties related to three manufacturing directions were considered. The new design methodology is illustrated by benchmark tests and examples of wrist-hand orthosis topology optimization in which stress and manufacturing constraints were taken into account. As demonstrated by the conducted comparison tests with available commercial tools, the solutions obtained with the new method were characterized by lower mass and shorter computation time.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 459-468
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization of quasistatic contact problems
Autorzy:
Myśliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/331424.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
elastyczność
optymalizacja topologiczna
quasistatic contact problem
elasticity
Tresca friction
topology optimization
Opis:
This paper deals with the formulation of a necessary optimality condition for a topology optimization problem for an elastic contact problem with Tresca friction. In the paper a quasistatic contact model is considered, rather than a stationary one used in the literature. The functional approximating the normal contact stress is chosen as the shape functional. The aim of the topology optimization problem considered is to find the optimal material distribution inside a design domain occupied by the body in unilateral contact with the rigid foundation to obtain the optimally shaped domain for which the normal contact stress along the contact boundary is minimized. The volume of the body is assumed to be bounded. Using the material derivative and asymptotic expansion methods as well as the results concerning the differentiability of solutions to quasistatic variational inequalities, the topological derivative of the shape functional is calculated and a necessary optimality condition is formulated.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 269-280
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization of a 3D part virtually printed by FDM
Autorzy:
Antar, I.
Othmani, M.
Zarbane, K.
El Oumami, M.
Beidouri, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2172164.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
topology optimization
fused deposition modelling
virtually 3D printed part
SIMP
optymalizacja topologii
modelowanie osadzania stopionego
drukowanie 3D
Opis:
Purpose This research work aims to exhibit the possibility to topologically optimize a mesostructured part printed virtually by FDM taking into account the manufacturing parameters. Design/methodology/approach The topology optimization of a 3D part printed by FDM was carried out using the software ABAQUS. On the other hand, a numerical approach using a script based on G-code file has been achieved to create a virtual model. Then, it was optimized according to the Solid Isotropic Material with Penalization (SIMP) method, which minimizing the strain energy was the objective function and the volume fraction of 30% was the constraint. Findings The final topological optimization design of the virtual model is approximately similar to the homogeneous part. Furthermore, the strain energy of the virtual model is less than the homogeneous part. However, the virtually 3D optimized part volume is higher than the homogeneous one. Research limitations/implications In this study, we have limited our study on one layer owing to reduce the simulation time. Moreover, the time required to optimize the virtual model is inordinate. The ensuing study, we will optimize a multiple layer of the mesostructure. Practical implications Our study provides a powerful method to optimize with accurately a mesostructure taken into consideration the manufacturing setting. Originality/value In this paper, we have studied through an original approach the potential of topology optimization of a 3D part virtually printed by FDM. By means of our approach, we were able to optimize topologically the 3D parts printed by FDM taking into account the manufacturing parameters.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 25--32
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization in structural mechanics
Autorzy:
Lewiński, T.
Czarnecki, S.
Dzierżanowski, G.
Sokół, T.
Powiązania:
https://bibliotekanauki.pl/articles/202001.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
structural optimization
topology optimization
free material design
anisotropic elasticity
compliance minimization
minimum weight design
funicular structures
optimal design of frames
Opis:
Optimization of structural topology, called briefly: topology optimization, is a relatively new branch of structural optimization. Its aim is to create optimal structures, instead of correcting the dimensions or changing the shapes of initial designs. For being able to create the structure, one should have a possibility to handle the members of zero stiffness or admit the material of singular constitutive properties, i.e. void. In the present paper, four fundamental problems of topology optimization are discussed: Michell’s structures, two-material layout problem in light of the relaxation by homogenization theory, optimal shape design and the free material design. Their features are disclosed by presenting results for selected problems concerning the same feasible domain, boundary conditions and applied loading. This discussion provides a short introduction into current topics of topology optimization.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 23-37
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization for elastic base under rectangular plate subjected to moving load
Autorzy:
Jilavyan, S. H.
Khurshudyan, A. Zh.
Powiązania:
https://bibliotekanauki.pl/articles/230086.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed system
moving load
Kirchhoff plate
Winkler base
topology optimization
problem of moments
L∞-optimal control
distributions
Bubnov–Galerkin procedure
Opis:
Distribution optimization of elastic material under elastic isotropic rectangular thin plate subjected to concentrated moving load is investigated in the present paper. The aim of optimization is to damp its vibrations in finite (fixed) time. Accepting Kirchhoff hypothesis with respect to the plate and Winkler hypothesis with respect to the base, the mathematical model of the problem is constructed as two–dimensional bilinear equation, i.e. linear in state and control function. The maximal quantity of the base material is taken as optimality criterion to be minimized. The Fourier distributional transform and the Bubnov–Galerkin procedures are used to reduce the problem to integral equality type constraints. The explicit solution in terms of two–dimensional Heaviside‘s function is obtained, describing piecewise–continuous distribution of the material. The determination of the switching points is reduced to a problem of nonlinear programming. Data from numerical analysis are presented.
Źródło:
Archives of Control Sciences; 2015, 25, 3; 289-305
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization - broadening the areas of application
Autorzy:
Bendsoe, M. P.
Lund, E.
Olhoff, N.
Sigmund, O.
Powiązania:
https://bibliotekanauki.pl/articles/970157.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optymalizacja topologiczna
laminat
płyn
topology optimization
laminates
pressure loads
multiphysics
fluids
Opis:
This paper deals with recent, developments of topology optimization techniques for application in some new types of design problems. The emphasis is on recent work of the Danish research groups at Aalborg University and at the Technical University of Denmark and focus is on the central role that the choice of objective functions and design parameterization plays for a successful extension of the material distribution approach to new design settings and to new types of physics models. The applications that will be outlined encompass design of laminated composite structures, design for pressure loads, design in fluids, design in acoustics, and design in photonics. A short outline of other design optimization activities is also given.
Źródło:
Control and Cybernetics; 2005, 34, 1; 7-35
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology algorithm built as an automaton with flexible rules
Autorzy:
Tajs-Zielińska, Katarzyna
Bochenek, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/2086875.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
topology optimization
cellular automaton
flexible update rules
optymalizacja topologii
automat komórkowy
zasady aktualizacji elastyczne
Opis:
Developing novel methods, approaches and computational techniques is essential for solving efficiently more and more demanding up-to-date engineering problems. Designing durable, light and eco-friendly structures starts at the conceptual stage, where new efficient design and optimization tools need to be implemented. Nowadays, apart from the traditional gradient-based methods applied to optimal structural and material design, innovative techniques based on versatile heuristic concepts, like for example Cellular Automata, are implemented. Cellular Automata are built to represent mechanical systems where the special local update rules are implemented to mimic the performance of complex systems. This paper presents a novel concept of flexible Cellular Automata rules and their implementation into topology optimization process. Despite a few decades of development, topology optimization still remains one of the most important research fields within the area of structural and material design. One can notice novel ideas and formulations as well as new fields of their implementation. What stimulates that progress is that the researcher community continuously works on innovative and efficient topology optimization methods and algorithms. The proposed algorithm combined with an efficient analysis system ANSYS offers a fast convergence of the topology generation process and allows obtaining well-defined final topologies.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138813, 1--17
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological sensitivity analysis for elliptic problems on graphs
Autorzy:
Leugering, G.
Sokolowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/970307.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
differential equations on metric graphs
obstacles
topology optimization
asymptotic analysis
Opis:
We consider elliptic problems on graphs under given loads and bilateral contact conditions. We ask the question: which graph is best suited to sustain the loads and the constraints. More precisely, given a cost function we may look at a multiple node of the graph with edge degree q and ask as to whether that node should be resolved into a number of nodes of edge degree less than q, in order to decrease the cost. With this question in mind, we are looking into the sensitivity analysis of a graph carrying a second order elliptic equation with respect to changing its topology by releasing nodes with high edge degree or including an edge. With the machinery at hand developed here, we are in the position to define the topological gradient of an elliptic problem on a graph.
Źródło:
Control and Cybernetics; 2008, 37, 4; 971-997
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological classes of statically determinate beams with arbitrary number of supports under the most unfavourably distributed load
Autorzy:
Kozikowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/281725.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
statically determinate beams
topology and geometry optimization
equivalence classes
worst load
Opis:
The paper deals with topological classes of statically determinate beams with an arbitrary number of pin supports. The beams carry piece-wisely distributed loads which are placed in such a way that bending moment values are extreme at any section. For such loads, it is sufficient to consider only two load cases with alternate spans uniformly loaded. Each beam with a fixed topology is subjected to geometrical optimization with the absolute maximum moment as the objective function. Exact formulas for optimal values of geometrical parameters are found for all topologies. An equality criterion between minimum values of the objective function is used as an equivalence relation. On the basis of this relation, the set of all topologies is divided into equivalence topological classes. Typical features of these classes are found and discussed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 257-269
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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