Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Author: search.filters.author.Kiper, GökhanSubject: search.filters.subject.Deployable structures

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Now showing 1 - 4 of 4
  • Master Thesis
    Design of Hidam: Highly Deployable Articulated Mast for Positioning of Satellite Components
    (01. Izmir Institute of Technology, 2022) Cebeci, Yunus; Kiper, Gökhan; Kiper, Gökhan
    With the emerging space activities, use of deployable structures for aerospace applications increased in recent years. Deployable masts are special types of these structures where longitudinal deployment is required and deployable truss mast is one of the deployable mast types. In this thesis, a new design methodology for deployable truss masts is introduced resulting in superior packing ratio. It is a type of a Wren platform which has a single degree of freedom, and it is called HiDAM: Highly Deployable Articulated Mast. The mathematical model for HiDAM is constructed and the packing ratio is maximized by optimizing part lengths. Considering the set design requirements, the constructional design is carried out, first in two dimensions where mathematical model is developed, then in three dimensions. Along with the constructional design, the prototype of HiDAM is manufactured and assembled for a single deployable unit with which overall mechanism movement can be seen. It is presented that with the proposed deployable truss mast HiDAM, the packing ratio can be increased by about 12% compared to the most recent deployable truss mast examples in the literature.
  • Master Thesis
    Design of Deployable Structures Comprising Altmann Linkages
    (01. Izmir Institute of Technology, 2020) Yıldız, Görkem; Kiper, Gökhan
    The main objective of this thesis is to investigate possible mobile networks comprising modified Altmann linkages which can be used as deployable structures. Altmann linkage is an overconstrained single-loop linkage with six revolute joints. Within the scope of this thesis, first a modified version of the Altmann linkage is introduced. The modified version of the linkage allows more feasible solutions for constructional design compared to the original linkage. Then, the loop closure equations are written and input/output relationship of the linkage are obtained. Next, possible networks of modified Altman linkages are examined. The networks are obtained either by taking two common links between adjacent loops, or connecting adjacent loops with two new revolute joints without any common links. Also, mobility analysis is performed for each network. Finally, the deployment stages of obtained networks are modelled in a CAD software. Some of the derived networks are already noted in the literature, but several novel networks are introduced in this thesis.
  • Master Thesis
    Kinematic Design of Scissor Linkages
    (Izmir Institute of Technology, 2018) Karagöz, Cevahir; Kiper, Gökhan
    The primary objective of this thesis is to propose a design method for linkages simulating the transformation of a planar curve from an initial form to a final form. First, the topologies of fundamental loops are examined using symmetry patterns. Design methodologies for the hence obtained mechanisms are formulated. The given curves are discretized initially, and the nodes are constructed. Then the side lengths of the loops are obtained in order to obtain the desired transformation between the given curves. Finally, different deployable and transformable linkage examples are presented.
  • Master Thesis
    Design of a Reconfigurable Deployable Structure for Post Disaster Housing
    (Izmir Institute of Technology, 2014) Ataer, Fulya; Korkmaz, Koray; Kiper, Gökhan
    In this thesis, the possibility of constructing reconfigurable deployable structure composed of planar linkage units has been explored. The first part of the thesis is devoted to literature survey on housing recovery. When the current researches on post disaster housing are investigated, it is observed that most of post disaster housing or temporary buildings in the literature are predefined portable, demountable or relocatable buildings. Deployable buildings serve for a single function. A study into the existence of alternative forms of a reconfigurable deployable structure has been done. The conditions for the alternative forms to be a multi-functional building have been derived. Reconfigurable deployable structure presented here is a single degrees-of-freedom (DoF) multi-loop linkage which has more than two configurations. The alternative forms that a linkage is constructed with the same links and connections are called configurations or assembly modes of the linkage. During its motion, the linkage may pass from one assembly mode to another, which is called reconfiguration or assembly mode change. Design and position analysis of the linkage mechanism have been implemented in Microsoft Excel® environment. The link lengths can be varied in this environment and the motion of the structure can be simulated by changing input joint parameters. Four different case studies have been designed in Microsoft Excel®. A reconfigurable deployable structure can be used as a multi-functional shelter or canopy which can take many forms in a few minutes for urgent needs after disasters, military purpose or public needs. Its deployed and retracted (or compact) geometries are explored. As a case study the dimensions of links are presented. Installation process for different functions is explained. The full concept for the structure, from outer covering material to foundation is then detailed. Finally, a sample material cost analysis is performed to determine if the product is financially feasible.