Design of a 2-DOF 8R Linkage for Transformable Hypar Structure

Abstract

Double curved geometries including hyperbolicparaboloids (hypars) have become a trend in contemporary architecture. However, most of the constructed architectural examples of the hypars are static and cannot offer any form variability. In this paper, a 2-DOF 8R linkage mechanism is introduced to buildtransformable hypar structures. It is inspired from the basic design principles of Bennett linkage. By its distinctive connection details and additional links, this novel mechanism can change its form fromplanar geometries to various hypars. The paper begins with the brief summary of the applications of hypar structures in architecture. Secondly, main principles and deficiencies of the Bennett linkage are presented. According to these deficiencies, structural synthesis of the novel mechanism is considered. Finally, advantages and potential uses of the proposed novel mechanism are explained.

Characterizing Smart Environments as Interactive and Collective Platforms: A Review of the Key Behaviors of Responsive Architecture

“…The most dominant IB in the kinetic architecture literature is a structural adaptive behavior using folding mechanisms [ 76 , 77 , 78 , 79 , 80 , 81 , 82 ]. For example, linkage mechanisms for kinetic architecture include Watt-I linkage as a one degree-of-freedom (1-DOF) mechanism [ 76 ], spherical linkages [ 78 , 82 ] and a two degree-of-freedom (2-DOF) 8R (revolute joint) linkage [ 79 ]. The Watt-I “finger linkage” used in robotic, anthropomorphic fingers has been adopted for a convertible stadium roof structure, providing a wide range of structure flexibility and shading options [ 76 ].…”

“…Their translational motion behavior uses scissor-like structures that develop the target curvature by changing the length of the bar and creating foldable assemblies [ 78 ]. Lastly, from the Bennett linkage using a 4R spatial linkage, Korkmaz et al [ 79 ] suggest a 2-DOF 8R linkage for transformable hyperbolic paraboloid (“hypar”) structures. The 2-DOF system allows various configurational structures and wider form flexibility, responding to dynamic and constantly changing activities.…”

“…The 2-DOF system allows various configurational structures and wider form flexibility, responding to dynamic and constantly changing activities. This kinetic, structural adaptive behavior is most often applied to roof structures [ 76 , 77 , 79 , 80 ].…”

A New Parameter Design Method of a 6-DOF Parallel Motion Simulator for a Given Workspace

“…To design a parallel manipulator, the first step is to design the configuration for the manipulator, this is called the type synthesis (Gao et al, 2011;Korkmaz et al, 2012). And then the geometrical parameters of the manipulator should be determined.…”

Design of adaptive structures by kinematic synthesis of mechanisms

“…By the transformation of four-bar linkage, this project proposes various green terrace alternatives for the occupants. Korkmaz et al (2012) has developed a transformable mechanism with eight planar hinges derived from Bennett linkage and has adapted this mechanism to a transformable shade design. Different from Bennett linkage, this mechanism can achieve asymmetrical transformations (Figure 4b-c).…”