Dr.Zhong YOU
Department of Engineering Science,University of Oxford Deployable structures are structures capable of large shape changes. They can be foundin many places from common household items such as umbrellas and foldable chairs to solar panels of spacecrafts and retractable roofs, that are. The purpose of adopting deployable structures is to have convenience in transportation or storage, but some, e.g., the retractable roofs, are concerned primarily with provision of instant coverage or shelter to create a desirable environment. In accordance with the deployment process, they fall into two categories. The first category is the deformable structure characterised by the fact that the overall strain energy of the structure varies during geometrical transformation, whereas the second category is essentially mechanism. The deployment is executed by activation of one or a number of carefully designed internal mechanisms. Retractable roofs for sports facilities and a toy called the Hoberman sphere belong to the second category. My talk will focus on the second category. The termMotion Structuresis adopted to represent this branch of the deployable structure family owing to the existence of internal mechanisms. There are two ways to synthesise motion structures. Structural engineers and architects, responsible for most of the motion structures for civil engineering applications such as retractable roofs and façades, are inclined to adopt concepts involving a small number of larger moving bodies whose motions are then synchronised by electronic means. This approach becomes less effective when the purpose of motion structures is to achieve small and compact packaging size. An alternative is to select known conventional mechanisms as basic building blocks and then to assemble such blocks together in such a way that the degrees of freedom of each mechanism are retained. In the past few years, my students and I had created a number of novel motion structures by the latter approach. In the talk, I shall share with audiencemy experience. Almost all of the motion structures in the talk are one degree of freedom assembly created by basic mechanisms such as the planar and spatial linkages with only hinge joints. 时间：2011年7月18日8:30 地点：1号综合实验楼602 主办单位：工业装备结构分析国家重点实验室
工程力学系 | 
