In this paper, a novel two-dimensional scissor structure that transforms between concave and convex configurations is presented. The structure is designed by a method of assembling kite or anti-kite loops in the flat configuration. Angulated units are generated from the assembled loops. Finally, a new angulated scissor unit is introduced in order to design the novel scissor structure.
When the existing literature on the research of scissor structures is thoroughly investigated, it is seen that different researchers use different terminologies and classifications especially for the definition of the primary units and the motion type. Some of the studies define the whole geometry based on the geometric properties of the primary scissor units and the unit lines while some other studies define it according to the loops. All these studies use different names for similar elements. This article aims to review the literature on the classification and terminology of scissor structures and represent the state of art on the studies. Tables are represented showing all approaches in the literature. In addition, the article criticizes the missing points of each terminology and definition, and proposes some new terminology. In order to arrive at this aim, different definitions of the primary scissor units and motion types used in key studies in the literature are investigated thoroughly. With several examples, it is demonstrated that naming the scissor units according to the resulting motion type might be misleading and it is better to specify the motion type for the whole structure. A classification for transformation of planar curves is presented.
Hareketli köprüler ilk zamanlar korunma ihtiyacı ile tasarlanmıştır. Modern zamanlarda ise ulaşımı kolaylaştırmak için geliştirilmeye devam edilmektedir. Sabit köprülerin aksine farklı kullanım senaryolarını desteklemeleri sebebiyle tercih edilmektedirler. Bu yazıda mevcut hareketli köprüler kinematik özellikleri açısından tanıtılmış, hangi kullanım seneryolarını destekledikleri ve eksik kaldıkları yönler açıklanmıştır. Daha sonra güncel bir örnek olan Rolling Bridge'de kullanılmış strüktürel mekanizmanın tasarım prensiplerden yararlanarak, tüm kullanım senaryolarını destekleyen form değiştirebilen köprü için çok devreli ve iki serbestlikli yeni bir strüktürel mekanizma önerilmiştir. Son olarak mekanizmanın pozisyon analizi yapılarak Microsoft Excel ® ortamında gerçekleştirilen grafik sunulmuştur.
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