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Geometric Formation and Mechanical Analyse of Space Deployable Structcures

Author: YinGuoZhuo
Tutor: YangNa
School: Beijing Jiaotong University
Course: Structural Engineering
Keywords: Scissor-like structure Rod-cable deployable structure geometric design deploying process mechanical analyze
CLC: TU399
Type: Master's thesis
Year: 2008
Downloads: 261
Quote: 3
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Abstract


The deployable structure, which is developed in the 1960s, is a new style of space structures. The proposed structure is deployed when used, and it can be put away after folded while not used. As a result of its small volume after folded and its convenience when deployed, the structure is applied gradually in the field of architecture and astronautics. However, its application in the field of architecture is still rare in our country, so the correlated study is to be performed essentially. We select Scissor-like deployable structure and Rod-cable deployable structure as the subject investigated, focus on the analysis of geometric structure and mechanical performance of deployable structure, take the finite element program ANASYS as the analysis method, simulate the foldable process of deployable structure and analyze the mechanical performance of different loads. This paper is divided into four chapters, which main show the geometric design and mechanical performance of the structure.The first chapter summarizes the study conditions of deployable structure, which includes the theory research and project practice.The second chapter studies the geometric design of the deployable structure and takes computer simulate deploying process, if it is feasible on geometric composition. The geometric design, which is to ensure the implementation of free deploying, is the base of structure design. First, the chapter firstly analyzes the geometric performance of Scissor-like structure and Rod-cable structure, and geometric qualification to ensure structure free deploying. Second, design structure deploying model: This model design should ensure the deploying process smooth, and turn it into structure after it reaches the prospective position, bearing loads to achieve usability. Third, for these two examples of deployable structure: we first give the methods of model deploying and folding, and then simulate the movement process by using finite element program to apply forced displacement. In his chapter we use the dynamic simulation of deploying process to prove the validity of geometric relation and structure design, which can guide our project construction.The main purpose of the third chapter is to study the mechanical performance of Scissor-like deployable structure. In this chapter we adopt appropriate Scissor-like model and change its parameter. Though much computable analysis to calculate each mechanic index such as deformation, stress and moment, we can summarize the influence rule on structure mechanical performance when the parameters change such as mesh height, element size, size changing and depth-span radio. When height-span ratio increases, the moment increases and the stress reduces; when length-width ratio increased, the moment and stress both increase. Full span load makes structure dangerous. Then we can compare the differences between Scissor-like deployable structure and common mesh structure, put forward their quality performance to adopt appropriate structure model in different conditions, which can be referred by project.What is researched in the forth chapter is mechanical performance of Rod-cable structure. For its main working condition is space, the control loads impacting its working is dynamic force, which can generate dynamic responses. We study the structure mechanic performance when the parameters are changed. First, we select the suitable Rod-cable structure model, changing its span, element size, rod section, cable section and prestress. Then we carry out modal analysis, frequency response analysis of simple harmonic loads and response analysis of impact loads. At modal analysis, when span, element size increase, the frequency reduces; When rod section increases, the frequency increases. At impact loads analysis, when span, element size and rod section increase, the response increases; When cable section increases, the response reduces. We can compare the response of impact and static loads, which can be referred by structure design.

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