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Calibri 83ffff̙̙3f3fff3f3f33333f33333.PTU Delft Repositoryg ;uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:6fa5e07e-dd52-4aa2-abe0-ca9c238d5117Dhttp://resolver.tudelft.nl/uuid:6fa5e07e-dd52-4aa2-abe0-ca9c238d5117kSimultaneous optimization of shape and topology of free-form shells based on uniform parameterization modelXia, Y. (TU Delft Applied Mechanics; Harbin Institute of Technology); Wu, Yue (Harbin Institute of Technology); Hendriks, M.A.N. (TU Delft Applied Mechanics; Norwegian University of Science and Technology (NTNU))In current optimization methods for free-form shells, the shape and topology are usually optimized separately. These methods are based on the assumption that the shape and topology of a shell influence each other only slightly, but this is not always correct. Moreover, different parameterization models are used in the shape optimization and topology optimization of free-form shells, which brings difficulties to carry out the integrated optimization. To solve this problem, an integrated method is proposed for simultaneously optimizing shape and topology for free-form shells. A uniform parameterization model based on NURBS solids is established to parameterize the free-form shells. In this model, only a small number of variables are used to describe both the shape and topology of the shell. In this way, the integrated optimization problem can be simplified, thus decrease the computational complexity. The integrated optimization of shape and topology is a complicated and large-scale optimization problem. Solving this problem requires a suitable optimization method. In this paper, the Method of Moving Asymptotes (MMA) is adopted. Finally, numerical examples are presented to address the importance of the optimization sequences and show the effectiveness and application of the proposed method.zFree-form shell; Integrated optimization; NURBS; Shape optimization; Topology optimization; Uniform parameterization modelenjournal articleAccepted Author Manuscript
2021-03-01)uuid:3420c6e4-5e1a-4ae8-b1a1-54481cffee6eDhttp://resolver.tudelft.nl/uuid:3420c6e4-5e1a-4ae8-b1a1-54481cffee6e?Form-finding and construction of ice composite shell structures9Wu, Yue (Harbin Institute of Technology); Liu, Xiuming (Harbin Institute of Technology); Li, Q. (TU Delft Structural Design & Mechanics); Chen, Boxuan (Harbin Institute of Technology); Luo, Peng (Harbin Institute of Technology); Pronk, Arno (Eindhoven University of Technology); Mergny, Elke (University of Lige)3Bgle, Annette (editor); Grohmann, Manfred (editor)By using inflatable moulds and then spraying cellulose-water mixture, one ice dome and two ice towers were built in Harbin in December 2016. During the whole process, form-finding of the inflatable moulds as well as the construction of these ice composite shell structures are very important for the final results.<br/>The mould for the ice dome structure was a result of the manipulation of a synclastic membrane with a rope net. The mould for the ice tower structure consisted of some anticlastic surfaces. Form-finding of the inflatable moulds was conducted by the parametric tool EasyForm which is a self-programed plug-in in Grasshopper based on Vector Form Intrinsic Finite Element method.<br/>In a low-temperature work environment (-10 ! and below), the ice shell structures were constructed on the inflatable moulds. The cellulose-water mixture was sprayed in thin layers continuously and uniformly in order to make the surface of a shell of cellulose-reinforced ice. The construction process is introduced detailedly in this paper.Ice composite shell; form-finding; Vector Form Intrinsic Finite Element; construction; inflatable mould; cellulose-reinforced iceconference paper)uuid:dcc86ada-842a-4a9a-8444-e9b1ca1ea8c3Dhttp://resolver.tudelft.nl/uuid:dcc86ada-842a-4a9a-8444-e9b1ca1ea8c3gSize and Topology Optimization for Trusses with Discr< ete Design Variables by Improved Firefly AlgorithmWu, Yue (Harbin Institute of Technology); Li, Q. (TU Delft Structural Design & Mechanics; Harbin Institute of Technology); Hu, Qingjie (Hangzhou Xiaoshan Urban Planning Institute); Borgart, A. (TU Delft Structural Design & Mechanics)}Firefly Algorithm (FA, for short) is inspired by the social behavior of fireflies and their phenomenon of bioluminescent communication. Based on the fundamentals of FA, two improved strategies are proposed to conduct size and topology optimization for trusses with discrete design variables. Firstly, development of structural topology optimization method and the basic principle of standard FA are introduced in detail. Then, in order to apply the algorithm to optimization problems with discrete variables, the initial positions of fireflies and the position updating formula are discretized. By embedding the random-weight and enhancing the attractiveness, the performance of this algorithm is improved, and thus an Improved Firefly Algorithm (IFA, for short) is proposed. Furthermore, using size variables which are capable of including topology variables and size and topology optimization for trusses with discrete variables is formulated based on the Ground Structure Approach. The essential techniques of variable elastic modulus technology and geometric construction analysis are applied in the structural analysis process. Subsequently, an optimization method for the size and topological design of trusses based on the IFA is introduced. Finally, two numerical examples are shown to verify the feasibility and efficiency of the proposed method by comparing with different deterministic methods.)uuid:2cca6b39-e76f-4445-8c62-5cf46786aca6Dhttp://resolver.tudelft.nl/uuid:2cca6b39-e76f-4445-8c62-5cf46786aca6}Form-finding of gridshells generated from hanging-chain models by using the Dynamic Relaxation method and the NURBS techniqueLi, Q. (TU Delft Structural Design & Mechanics; Harbin Institute of Technology); Wu, Yue (Harbin Institute of Technology); Borgart, A. (TU Delft Structural Design & Mechanics)Hanging models play an important role in shaping a structure since a very early age, and were favored by A. Gaudi, H. Isler, F. Otto and other architects or engineers. Nowadays, with the development of numerical analysis theory and computer technique, it is more accurate and convenient to simulate these physical models via numerical means. Based on the background, this paper presents a numerical form-finding method of gridshell structures generated from hanging-chain models by using Dynamic Relaxation method and the NURBS technique, which aims to obtain more complex structural forms with multiple control points.<br/>This method uses global NURBS surface interpolation to describe the initial cable-net model passing through the given target points, which serve as the fitting points of the NURBS surface. The cable elements of the cable-net are not allowed to elongate after form-finding, and clearly, this kind of cable-nets belongs to geometrically unstable system, whose form-finding process of it has a very strong nonlinearity. To solve this problem, it uses the Dynamic Relaxation method, which can complete the form-finding of geometrically unstable systems but with some special sets, to get the equilibrium form of the hanging cable-net under the gravity. However, this structural form may no longer pass through the given target points, and then it introduces the inverse iteration method to adjust the coordinates of the fitting points of the NURBS, which actually means to find the initial structural form which after form-finding can just right meet the target requirements. At last, some numerical examples are presented to demonstrate the validity of the proposed method in this paper.jform-finding; gridshells; hanging-chain models; Dynamic Relaxation method; NURBS; inverse iteration method)uuid:34dd249e-600c-40cb-9850-0037f8485dfcDhttp://resolver.tudelft.nl/uuid:34dd249e-600c-40cb-9850-0037f8485dfckThe Vector Form Intrinsic Finite Element method and several other form-find<jing methods for general networksLi, Q. (TU Delft Structural Design & Mechanics; Harbin Institute of Technology); Borgart, A. (TU Delft Structural Design & Mechanics); Wu, Yue (Harbin Institute of Technology)Discrete networks is a kind of form-active structural system which actively change its shape under varying load conditions. And for this kind of structural system, form-finding is the initial and essential part in their design process. Before the computer age, people complete the form-finding process using physical models, while with the advances in computational techniques, the research has focused on the numerical form-finding methods since the 1960s. A brief discussion on several numerical formfinding methods is presented in this paper. Firstly, two relatively mature numerical method, Dynamic Relaxation method and Force Density method, are introduced conceptually. And then, a newly developed numerical method, the Vector Form Intrinsic Finite Element method, is presented in more detail. At last, with a replacement of the calculation of the internal force of the element which obeys the Hooke's Law by the product of the force density and the length of the element, two derived methods based on the above three methods are proposed in this paper. Moreover, several numerical examples of hanging networks are shown to illustrate the validity and characteristic of the VFIFE method and the two newly proposed derived methods.form-finding; general networks; Dynamic Relaxation method; Force Density method; Vector Form Intrinsic Finite Element method; derived methods
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