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Y. Cengiz Toklu
Department of Civil Engineering, Istanbul Beykent University, Sariyer, Istanbul 34398, Turkey

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Journal article
Published: 03 April 2021 in Applied Sciences
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Total Potential Optimization using Metaheuristic Algorithms (TPO/MA) is an alternative tool for the analysis of structures. It is shown that this emerging method is advantageous in solving nonlinear problems like trusses, tensegrity structures, cable networks, and plane stress systems. In the present study, TPO/MA, which does not need any specific implementation for nonlinearity, is demonstrated to be successfully applied to the analysis of plane strain structures. A numerical investigation is performed using nine different metaheuristic algorithms and an adaptive harmony search in linear analysis of a structural mechanics problem having 8 free nodes defined as design variables in the minimization problem of total potential energy. For nonlinear stress-strain relation cases, two structural mechanics problems, one being a thick-walled pipe and the other being a cantilever retaining wall, are analyzed by employing adaptive harmony search, which was found to be the best one in linear analyses. The nonlinear stress-strain relations considered in these analyses are hypothetical ones due to the lack of any such relationship in the literature. The results have shown that TPO/MA can solve nonlinear plane strain problems that can be encountered as engineering problems in structural mechanics.

ACS Style

Yusuf Toklu; Gebrail Bekdaş; Melda Yücel; Sinan Nigdeli; Aylin Kayabekir; Sanghun Kim; Zong Geem. Total Potential Optimization Using Metaheuristic Algorithms for Solving Nonlinear Plane Strain Systems. Applied Sciences 2021, 11, 3220 .

AMA Style

Yusuf Toklu, Gebrail Bekdaş, Melda Yücel, Sinan Nigdeli, Aylin Kayabekir, Sanghun Kim, Zong Geem. Total Potential Optimization Using Metaheuristic Algorithms for Solving Nonlinear Plane Strain Systems. Applied Sciences. 2021; 11 (7):3220.

Chicago/Turabian Style

Yusuf Toklu; Gebrail Bekdaş; Melda Yücel; Sinan Nigdeli; Aylin Kayabekir; Sanghun Kim; Zong Geem. 2021. "Total Potential Optimization Using Metaheuristic Algorithms for Solving Nonlinear Plane Strain Systems." Applied Sciences 11, no. 7: 3220.

Journal article
Published: 26 June 2020 in Applied Sciences
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There are several ways of using three-dimensional printing techniques in the construction industry. One method that seems quite feasible is the concreting of walls and structural components starting at the bottom and progressing up in layers according to the principles of additive manufacturing. The goal of this study is to optimize the movements of a nozzle at one level that will result in this operation. This study considers that the movements of the nozzle can be of two types: rectangular only (i.e., only in x and y directions) or more freely, including moving in diagonal directions. Applications are performed on four hypothetical flats (with 7, 8, 14, and 31 walls, respectively) and a structural component with 17 members. It is shown that as the number of walls and members increase, the problem of optimizing the movements of the nozzle becomes increasingly difficult due to exponentially increasing path combinations. A comparison is presented in terms of the ratio of movements of the nozzle without concreting to total distances traveled. The optimization process is conducted using the Harmony Search algorithm with a special coding and encoding system.

ACS Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Zong Woo Geem. Harmony Search Optimization of Nozzle Movement for Additive Manufacturing of Concrete Structures and Concrete Elements. Applied Sciences 2020, 10, 4413 .

AMA Style

Yusuf Cengiz Toklu, Gebrail Bekdaş, Zong Woo Geem. Harmony Search Optimization of Nozzle Movement for Additive Manufacturing of Concrete Structures and Concrete Elements. Applied Sciences. 2020; 10 (12):4413.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Zong Woo Geem. 2020. "Harmony Search Optimization of Nozzle Movement for Additive Manufacturing of Concrete Structures and Concrete Elements." Applied Sciences 10, no. 12: 4413.

Journal article
Published: 27 March 2020 in Applied Sciences
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By finding the minimum total potential energy of a structural system with a defined degree of freedoms assigned as design variables, it is possible to find the equilibrium condition of the deformed system. This method, called total potential optimization using metaheuristic algorithms (TPO/MA), has been verified on truss and truss-like structures, such as cable systems and tensegric structures. Harmony Search (HS) algorithm methods perfectly found the analysis results of the previous structure types. In this study, TPO/MA is presented for analysis of plates for plane stress members to solve general types of problems. Due to the complex nature of the system, a novel hybrid Harmony Search (HHS) approach was proposed. HHS is the hybridization of local search phases of HS and the global search phase of the Flower Pollination Algorithm (FPA). The results found via HHS were verified with the finite element method (FEM). When compared with classical HS, HHS provides smaller total potential energy values, and needs less iterations than other new generation metaheuristic algorithms.

ACS Style

Aylin Ece Kayabekir; Yusuf Cengiz Toklu; Gebrail Bekdaş; Sinan Melih Nigdeli; Melda Yücel; Zong Woo Geem. A Novel Hybrid Harmony Search Approach for the Analysis of Plane Stress Systems via Total Potential Optimization. Applied Sciences 2020, 10, 2301 .

AMA Style

Aylin Ece Kayabekir, Yusuf Cengiz Toklu, Gebrail Bekdaş, Sinan Melih Nigdeli, Melda Yücel, Zong Woo Geem. A Novel Hybrid Harmony Search Approach for the Analysis of Plane Stress Systems via Total Potential Optimization. Applied Sciences. 2020; 10 (7):2301.

Chicago/Turabian Style

Aylin Ece Kayabekir; Yusuf Cengiz Toklu; Gebrail Bekdaş; Sinan Melih Nigdeli; Melda Yücel; Zong Woo Geem. 2020. "A Novel Hybrid Harmony Search Approach for the Analysis of Plane Stress Systems via Total Potential Optimization." Applied Sciences 10, no. 7: 2301.

Conference paper
Published: 10 July 2018 in INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017)
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In civil engineering, optimization is an important issue in minimization of structural responses or production costs. In optimization methodologies, metaheuristic methods are effective in finding precise results. In this study, a new developed metaheuristic algorithm called Jaya Algorithm (JA) is applied to a basic structural optimization problem. In this problem, the dimensions of an I-beam are optimized for the minimization of the vertical deflection. The result of the numerical example was compared with the results existing in the literature. It is seen that the JA method is more favorable than the others as far as the computational effort is concerned. Also, the effect of population number was tested for the I-beam problem.

ACS Style

Gebrail Bekdaş; Sinan Melih Nigdeli; Aylin Ece Kayabekir; Yusuf Cengiz Toklu. Minimization of vertical deflection of an optimum I-beam by Jaya algorithm. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 2018, 1978, 260002 .

AMA Style

Gebrail Bekdaş, Sinan Melih Nigdeli, Aylin Ece Kayabekir, Yusuf Cengiz Toklu. Minimization of vertical deflection of an optimum I-beam by Jaya algorithm. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017). 2018; 1978 (1):260002.

Chicago/Turabian Style

Gebrail Bekdaş; Sinan Melih Nigdeli; Aylin Ece Kayabekir; Yusuf Cengiz Toklu. 2018. "Minimization of vertical deflection of an optimum I-beam by Jaya algorithm." INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 1978, no. 1: 260002.

Conference paper
Published: 10 July 2018 in INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017)
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ACS Style

Yusuf Cengiz Toklu; Sinan Melih Nigdeli; Gebrail Bekdaş; Barış Sayın. Preface of the “Metaheuristic and Numerical Analysis in Engineering”. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 2018, 1978, 260001 .

AMA Style

Yusuf Cengiz Toklu, Sinan Melih Nigdeli, Gebrail Bekdaş, Barış Sayın. Preface of the “Metaheuristic and Numerical Analysis in Engineering”. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017). 2018; 1978 (1):260001.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Sinan Melih Nigdeli; Gebrail Bekdaş; Barış Sayın. 2018. "Preface of the “Metaheuristic and Numerical Analysis in Engineering”." INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 1978, no. 1: 260001.

Conference paper
Published: 10 July 2018 in INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017)
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Under-constrained and unstable structures are those which are kinematically unstable. They may show large displacements even under very small forces contrarily to well-constrained stable structures. Under-constrained structures manifest themselves with insufficient boundary conditions. On the other hand, structures with missing members may become kinematically unstable under certain loadings. A common property of these structures is that the rank of their stiffness matrix, used in their analysis by classical methods, comes out to be zero, thus making impossible their analysis by these methods. Fortunately, application of the method Total Potential Optimization using Metaheuristic Algorithms (TPO/MA) makes the analysis of these structures very simple, with no extra difficulty as compared to the analysis of well-constrained stable structures. Examples shown in this study are demonstrating this fact.

ACS Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Sinan Melih Nigdeli. Analysis of under-constrained and unstable structures by the method TPO/MA. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 2018, 1978, 260003 .

AMA Style

Yusuf Cengiz Toklu, Gebrail Bekdaş, Sinan Melih Nigdeli. Analysis of under-constrained and unstable structures by the method TPO/MA. INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017). 2018; 1978 (1):260003.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Sinan Melih Nigdeli. 2018. "Analysis of under-constrained and unstable structures by the method TPO/MA." INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017) 1978, no. 1: 260003.

Journal article
Published: 18 September 2017 in Challenge Journal of Structural Mechanics
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Minimum potential energy principle is the basis of the most of the well-known traditional techniques used in the structural analysis. This principle determines the equilibrium conditions of systems with reference to minimization of the sum of the total potential energy of the structure. In traditional applications, this methodology is formulized by using matrix operations. A methodology has been proposed in the last decades for structural analyses based on the idea of using metaheuristic algorithms to obtain minimum potential energy of the structural system instead of following this classical approach. This new method, called “Total Potential Optimization using Metaheuristic Algorithms (TPO/MA)”, has been applied in this paper to truss structures considering linear and nonlinear behavior of the structural material. The metaheuristic method used in this process is teaching-learning based optimization (TLBO) algorithm. The proposed technique is applied on numerical examples and results are compared with other techniques in order to test the efficiency of the proposed method. According to results obtained, TPO/MA method with TLBO algorithm is a feasible technique for the investigated problem.

ACS Style

Rasim Temür; Gebrail Bekdaş; Yusuf Cengiz Toklu. Total potential energy minimization method in structural analysis considering material nonlinearity. Challenge Journal of Structural Mechanics 2017, 3, 129 .

AMA Style

Rasim Temür, Gebrail Bekdaş, Yusuf Cengiz Toklu. Total potential energy minimization method in structural analysis considering material nonlinearity. Challenge Journal of Structural Mechanics. 2017; 3 (3):129.

Chicago/Turabian Style

Rasim Temür; Gebrail Bekdaş; Yusuf Cengiz Toklu. 2017. "Total potential energy minimization method in structural analysis considering material nonlinearity." Challenge Journal of Structural Mechanics 3, no. 3: 129.

Conference paper
Published: 01 June 2017 in 2017 8th International Conference on Recent Advances in Space Technologies (RAST)
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Advance of civilization has been realized through the ages by exploration of unknown parts of the Earth and by exploiting new resources thus acquired. There are currently practically no new areas on this planet to be explored and exploited. This is achieved by the completion of the period called globalization. As a natural continuation of this process, humans will now explore and exploit new areas beyond Earth, i.e. in space. Moon has already been explored partly, it awaits a complete exploration and colonization. The next step will be Mars and beyond. Habitation on these new space bodies will firstly necessitate construction of outposts on these bodies. Thus construction on the Moon, Mars, and other space bodies can be considered to be an important component of space research. In the present article, an overview of space research is presented together with the innovations awaited in space construction industry and the importance of feedback of these studies to construction industry in general.

ACS Style

Yusuf Cengiz Toklu; Ali Erdem Cercevik. Space research and extraterrestrial construction industry. 2017 8th International Conference on Recent Advances in Space Technologies (RAST) 2017, 11 -15.

AMA Style

Yusuf Cengiz Toklu, Ali Erdem Cercevik. Space research and extraterrestrial construction industry. 2017 8th International Conference on Recent Advances in Space Technologies (RAST). 2017; ():11-15.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Ali Erdem Cercevik. 2017. "Space research and extraterrestrial construction industry." 2017 8th International Conference on Recent Advances in Space Technologies (RAST) , no. : 11-15.

Conference paper
Published: 01 June 2017 in 2017 8th International Conference on Recent Advances in Space Technologies (RAST)
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It is obvious that lunar structures will be constructed on lunar surface, and that the materials to be used are only lunar soil. That is why lunar soils has to be investigated thoroughly as to its physical, chemical and mechanical properties. Unfortunately there is not enough lunar rock or soil brought to Earth for being able to run these analyses. For this purpose, several simulants have been produced in countries like US, Canada, Japan, and China etc. This paper is about an attempt carried out for production of lunar soil simulant in Turkey. For this purpose, undegenerated soil samples are collected from relatively young regions of Turkey, like Kula Sandal Divlit region; the properties of these soils including their chemical properties are compared to properties of lunar soils. As a result of these comparisons, a mix is produced to represent lunar soil. It is hoped that this study will be repeated with more samples from other parts of Turkey to find other simulants to represent lunar soils and rocks in research about lunar constructions.

ACS Style

Yusuf Cengiz Toklu; Ali Erdem Cercevik; Suheyla Yerel Kandemir; Mustafa Ozgur Yayli. Production of lunar soil simulant in Turkey. 2017 8th International Conference on Recent Advances in Space Technologies (RAST) 2017, 1 -5.

AMA Style

Yusuf Cengiz Toklu, Ali Erdem Cercevik, Suheyla Yerel Kandemir, Mustafa Ozgur Yayli. Production of lunar soil simulant in Turkey. 2017 8th International Conference on Recent Advances in Space Technologies (RAST). 2017; ():1-5.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Ali Erdem Cercevik; Suheyla Yerel Kandemir; Mustafa Ozgur Yayli. 2017. "Production of lunar soil simulant in Turkey." 2017 8th International Conference on Recent Advances in Space Technologies (RAST) , no. : 1-5.

Journal article
Published: 02 September 2016 in Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi
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Öz Otomatik yapı üretim teknolojisi robotik temellidir ve katmanlı üretim teknolojisini kullanarak bilgisayar kontrolü altında büyük ölçekli nesneleri kalıp kullanmadan 3 boyutlu beton yazıcı cihazı aracılığıyla inşa edebilir. Bu çalışmanın amacı otomatik yapı üretim teknolojisinde, 3 boyutlu beton yazıcı cihazında kullanılabilecek uygun kıvamdaki harçları, düşük maliyetli en uygun malzemelerle oluşturabilmektir. Sonuç olarak düşük maliyetli malzemeler araştırılarak bu malzemeler kum, diatomit, çimento, öğütülmüş yüksek fırın cürufu, selüloz ve polipropilen lif olarak belirlenmiştir. Bu malzemeler kullanılarak 3 boyutlu beton yazıcı cihazında kullanılabilecek uygun kıvamda 7 adet deneme karışımı tespit edilmiştir. Bu karışımlar ile yoğunluk tayini, yayılma, basınç ve eğilme dayanımı deneyleri yapılmış, çökme deneyi ile kullanım süreleri belirlenmiş ve karışım oranları verilmiştir. Bu 7 adet deneme karışımlarından birinci olarak Deneme 2, ikinci olarak Deneme 3 ve üçüncü olarak Deneme 7’nin, 3 boyutlu beton yazıcı cihazında kullanımının diğer karışımlara göre daha uygun olduğu belirlenmiştir.

ACS Style

Yusuf Cengiz Toklu; Ali Erdem Çerçevik; Melih Şahinöz. Otomatik Yapı Üretim Teknolojisinde Kullanılabilecek Malzemelerin Belirlenmesi. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 2016, 21, 51 .

AMA Style

Yusuf Cengiz Toklu, Ali Erdem Çerçevik, Melih Şahinöz. Otomatik Yapı Üretim Teknolojisinde Kullanılabilecek Malzemelerin Belirlenmesi. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi. 2016; 21 (1):51.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Ali Erdem Çerçevik; Melih Şahinöz. 2016. "Otomatik Yapı Üretim Teknolojisinde Kullanılabilecek Malzemelerin Belirlenmesi." Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 21, no. 1: 51.

Journal article
Published: 01 September 2016 in Journal of Aerospace Engineering
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Tensile integrity (tensegrity, tensegric) structures are suggested for possible use in architectural works, bridges, covering large areas, and especially for habitats in outer space and on space bodies because of their minimal need for structural materials and ease of transfer and mounting. Structurally, their behavior is nonlinear and thus their analysis necessitates special care with recourse to special techniques. This study shows that their structural analysis can successfully be performed by a method called total potential optimization using metaheuristic algorithms (TPO/MA) with no special precautions in a very general way. In the applications, which are conducted using software prepared for analyzing all types of nonlinear trusses and trusslike structures, the load-displacement behaviors of tensegric structures are investigated to include also the effect of prestressing level on cables. Genetic algorithms are used in this study as the metaheuristic technique for solving the optimization part of the problem.

ACS Style

Yusuf Cengiz Toklu; Fatih Uzun. Analysis of Tensegric Structures by Total Potential Optimization Using Metaheuristic Algorithms. Journal of Aerospace Engineering 2016, 29, 04016023 .

AMA Style

Yusuf Cengiz Toklu, Fatih Uzun. Analysis of Tensegric Structures by Total Potential Optimization Using Metaheuristic Algorithms. Journal of Aerospace Engineering. 2016; 29 (5):04016023.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Fatih Uzun. 2016. "Analysis of Tensegric Structures by Total Potential Optimization Using Metaheuristic Algorithms." Journal of Aerospace Engineering 29, no. 5: 04016023.

Journal article
Published: 01 November 2015 in Construction and Building Materials
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ACS Style

Ceren Ince; Shahram Derogar; Nesrin Yardımcı Tiryakioğlu; Y. Cengiz Toklu. The influence of zeolite and powdered Bayburt stones on the water transport kinetics and mechanical properties of hydrated lime mortars. Construction and Building Materials 2015, 98, 345 -352.

AMA Style

Ceren Ince, Shahram Derogar, Nesrin Yardımcı Tiryakioğlu, Y. Cengiz Toklu. The influence of zeolite and powdered Bayburt stones on the water transport kinetics and mechanical properties of hydrated lime mortars. Construction and Building Materials. 2015; 98 ():345-352.

Chicago/Turabian Style

Ceren Ince; Shahram Derogar; Nesrin Yardımcı Tiryakioğlu; Y. Cengiz Toklu. 2015. "The influence of zeolite and powdered Bayburt stones on the water transport kinetics and mechanical properties of hydrated lime mortars." Construction and Building Materials 98, no. : 345-352.

Journal article
Published: 15 June 2015 in International Journal of Computational Methods
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Determination of nonunique configurations of structures is a problem which cannot be treated readily using classical methods of analysis. In the literature, these kinds of problems are tackled for some simple problems, like trusses with a small number of joints and members, and with specially designed approaches. The recent method of analysis called Total Potential Optimization using Metaheuristic Algorithms (TPO/MA), on the other hand, provides an efficient tool for dealing with these kinds of problems, practically without recourse to any special arrangement. In this analysis, using Harmony Search as the metaheuristic algorithm, large truss structures with linear elastic members are investigated under large deflections as to the existence of more than one solution. The results have shown that for the two examples investigated, a tower truss with 25 members and a dome truss with 24 members, nonunique configurations do exist at quite unexpected levels of loads, and that only one of them can be found with normal applications of the well-known Finite Element method.

ACS Style

Yusuf Cengiz Toklu; Rasim Temur; Gebrail Bekdaş. Computation of Nonunique Solutions for Trusses Undergoing Large Deflections. International Journal of Computational Methods 2015, 12, 1550022 .

AMA Style

Yusuf Cengiz Toklu, Rasim Temur, Gebrail Bekdaş. Computation of Nonunique Solutions for Trusses Undergoing Large Deflections. International Journal of Computational Methods. 2015; 12 (3):1550022.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Rasim Temur; Gebrail Bekdaş. 2015. "Computation of Nonunique Solutions for Trusses Undergoing Large Deflections." International Journal of Computational Methods 12, no. 3: 1550022.

Conference paper
Published: 01 June 2015 in 2015 7th International Conference on Recent Advances in Space Technologies (RAST)
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Lunar exploration is very important in the world. Investigation of lunar surface materials such as Agglutinitic Glass (A), Morris Is/FeO (M), LSCC Is/FeO (L), Total Pyx (T) and Plagioclase (P) is increase last years. The prediction of lunar surface materials including A, M, L, T and P is significant. In this study, the A (one of the important materials in the moon) were predicted by applying the linear regression analysis model. The R2 and R2adj are calculated that 81.20% and 75.83%, respectively. Finally, it was concluded that A can reliably be predicted by using the linear regression analysis model.

ACS Style

M. Ozgur Yayli; Suheyla Yerel Kandemir; Y. Cengiz Toklu; Yayli M.Ozgur. Assessment of lunar surface materials. 2015 7th International Conference on Recent Advances in Space Technologies (RAST) 2015, 7 -9.

AMA Style

M. Ozgur Yayli, Suheyla Yerel Kandemir, Y. Cengiz Toklu, Yayli M.Ozgur. Assessment of lunar surface materials. 2015 7th International Conference on Recent Advances in Space Technologies (RAST). 2015; ():7-9.

Chicago/Turabian Style

M. Ozgur Yayli; Suheyla Yerel Kandemir; Y. Cengiz Toklu; Yayli M.Ozgur. 2015. "Assessment of lunar surface materials." 2015 7th International Conference on Recent Advances in Space Technologies (RAST) , no. : 7-9.

Conference paper
Published: 01 June 2015 in 2015 7th International Conference on Recent Advances in Space Technologies (RAST)
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Men has completed the phase “globalization” on Earth by conquering almost all parts of the globe, by using almost all resources offered by this planet, in a collaborative way involving all habitants. Now it is time to start founding establishments out of this world, i.e. “spatialization” to mean “becoming citizens of space”. In this study we first discuss the mechanism of globalization and passage to spatialization. We discuss also the benefits of this new phase to habitants of Earth. Examples are given to show how space research helps to increase the level of comfort of human beings on Earth. It is also discussed that although space research is an expensive activity, it may be broken down to smaller pieces to enable all countries and private companies to enter into this race. Such a breakdown will help more even distribution of wealth among nations and peoples on Earth.

ACS Style

Y. Cengiz Toklu; Toklu Y.Cengiz. Social, historical and international aspects of space research. 2015 7th International Conference on Recent Advances in Space Technologies (RAST) 2015, 551 -554.

AMA Style

Y. Cengiz Toklu, Toklu Y.Cengiz. Social, historical and international aspects of space research. 2015 7th International Conference on Recent Advances in Space Technologies (RAST). 2015; ():551-554.

Chicago/Turabian Style

Y. Cengiz Toklu; Toklu Y.Cengiz. 2015. "Social, historical and international aspects of space research." 2015 7th International Conference on Recent Advances in Space Technologies (RAST) , no. : 551-554.

Book chapter
Published: 28 December 2014 in Artificial Intelligence: Foundations, Theory, and Algorithms
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Particle swarm optimization (PSO) algorithm is a heuristic optimization technique based on colony intelligence, developed through inspiration from social behaviors of bird flocks and fish schools. It is widely used in problems in which the optimal value of an objective function is searched. Geometrically nonlinear analysis of trusses is a problem of this kind. The deflected shape of the truss where potential energy value is minimal is known to correspond to the stable equilibrium position of the system analyzed. The objective of this study is to explore the success of PSO using this minimum total potential energy principle, in finding good solutions to geometrically nonlinear truss problems. For this purpose analyses are conducted on three structures, two plane trusses and a space truss. The results obtained show that in case of using 20 or more particles, PSO produces very good and robust solutions.

ACS Style

Rasim Temür; Yusuf Sait Türkan; Yusuf Cengiz Toklu. Geometrically Nonlinear Analysis of Trusses Using Particle Swarm Optimization. Artificial Intelligence: Foundations, Theory, and Algorithms 2014, 585, 283 -300.

AMA Style

Rasim Temür, Yusuf Sait Türkan, Yusuf Cengiz Toklu. Geometrically Nonlinear Analysis of Trusses Using Particle Swarm Optimization. Artificial Intelligence: Foundations, Theory, and Algorithms. 2014; 585 ():283-300.

Chicago/Turabian Style

Rasim Temür; Yusuf Sait Türkan; Yusuf Cengiz Toklu. 2014. "Geometrically Nonlinear Analysis of Trusses Using Particle Swarm Optimization." Artificial Intelligence: Foundations, Theory, and Algorithms 585, no. : 283-300.

Conference paper
Published: 17 October 2013 in AIP Conference Proceedings
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Preview this conference paper: Preface of the "2nd symposium on metaheuristic and numerical analysis / engineering applications", Page 1 of 1 < Previous page | Next page > /docserver/preview/fulltext/aip/proceeding/aipcp/1558/10.1063/1.4825514/1.4825514-1.gif

ACS Style

Sinan Melih Nigdeli; Gebrail Bekdaş; Yusuf Cengiz Toklu; Şemsi Burhanettin Altan. Preface of the "2nd symposium on metaheuristic and numerical analysis / engineering applications". AIP Conference Proceedings 2013, 1558, 419 -420.

AMA Style

Sinan Melih Nigdeli, Gebrail Bekdaş, Yusuf Cengiz Toklu, Şemsi Burhanettin Altan. Preface of the "2nd symposium on metaheuristic and numerical analysis / engineering applications". AIP Conference Proceedings. 2013; 1558 (1):419-420.

Chicago/Turabian Style

Sinan Melih Nigdeli; Gebrail Bekdaş; Yusuf Cengiz Toklu; Şemsi Burhanettin Altan. 2013. "Preface of the "2nd symposium on metaheuristic and numerical analysis / engineering applications"." AIP Conference Proceedings 1558, no. 1: 419-420.

Conference paper
Published: 01 June 2013 in 2013 6th International Conference on Recent Advances in Space Technologies (RAST)
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Tensile integrity (tensegrity, tensegric) structures are suggested for possible use in outer space and on space bodies because of their minimal need for structural materials, ease of transfer and mounting. Structurally their behavior is non-linear. It has been shown here that their structural analysis can successfully be performed by total potential optimization using meta-heuristic algorithms (TPO/MA). The named method is an emerging technique that combines minimum energy principle of mechanics with metaheuristic algorithms. The technique thus defined has been shown to be very efficient, accurate and robust in analyzing structures. The success of the technique is especially profound for non-linear structures. In this study the named technique is applied to tensile integrity (tensegrity, tensegric) structures which are known to be highly nonlinear, thus difficult to analyze.

ACS Style

Y. Cengiz Toklu; Rasim Temür; Gebrail Bekdaş; F. Uzun. Space applications of tensegric structures. 2013 6th International Conference on Recent Advances in Space Technologies (RAST) 2013, 29 -32.

AMA Style

Y. Cengiz Toklu, Rasim Temür, Gebrail Bekdaş, F. Uzun. Space applications of tensegric structures. 2013 6th International Conference on Recent Advances in Space Technologies (RAST). 2013; ():29-32.

Chicago/Turabian Style

Y. Cengiz Toklu; Rasim Temür; Gebrail Bekdaş; F. Uzun. 2013. "Space applications of tensegric structures." 2013 6th International Conference on Recent Advances in Space Technologies (RAST) , no. : 29-32.

Journal article
Published: 25 January 2013 in Structural Engineering and Mechanics
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ACS Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Rasim Temur. Analysis of trusses by total potential optimization method coupled with harmony search. Structural Engineering and Mechanics 2013, 45, 183 -199.

AMA Style

Yusuf Cengiz Toklu, Gebrail Bekdaş, Rasim Temur. Analysis of trusses by total potential optimization method coupled with harmony search. Structural Engineering and Mechanics. 2013; 45 (2):183-199.

Chicago/Turabian Style

Yusuf Cengiz Toklu; Gebrail Bekdaş; Rasim Temur. 2013. "Analysis of trusses by total potential optimization method coupled with harmony search." Structural Engineering and Mechanics 45, no. 2: 183-199.

Conference paper
Published: 01 January 2013 in 11TH INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2013: ICNAAM 2013
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In this paper it is intended to present a general look to metaheuristic algorithms and their applications to engineering problems. An assessment is given of metaheuristic algorithms to emphasize their common characteristics. A short literature survey is presented showing engineering problems that are solved by metaheuristic algorithms. The advantages and disadvantages of these new techniques over classical method are discussed.

ACS Style

Y. Cengiz Toklu. Metaheuristics and engineering. 11TH INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2013: ICNAAM 2013 2013, 1 .

AMA Style

Y. Cengiz Toklu. Metaheuristics and engineering. 11TH INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2013: ICNAAM 2013. 2013; ():1.

Chicago/Turabian Style

Y. Cengiz Toklu. 2013. "Metaheuristics and engineering." 11TH INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2013: ICNAAM 2013 , no. : 1.