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Research on Mechanical Characteristics of Modularized Membrane Deployable Structures

模块化膜可展开结构力学特性研究

基本信息

批准号：
14350516
负责人：
NATORI M.C.
金额：
$ 9.34万
依托单位：
Japan Aerospace and Exploration Agency (JAXA)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350516/
关键词：
Hierarchical Modular Structures Concepts of Things in Nature Flexible Structure Elements Membrane Wrinkle Nonlinear Finite Element Tension Field Theory Modified Stress-Strain Tensor 階層モジュール構造ケーブル構造膜面構造展開構造柔軟要素リンクル現象構造制御 /

项目摘要

For future space structure systems it is requested that they have variety of functions, extendibility, and redundancy. Modularized membrane deployable structures have some possibility to show new structure concepts to correspond to such requests. For their research it is necessary to clarify concepts of modularized structures, and also to analyze mechanical characteristics of cables and membranes. They are both difficult subjects in the present structure engineering, in which sufficient approaches are not established yet. In the present study, meanings of structure systems are reinvestigated though the consideration of concepts of modularized structures, and a new finite element approach based on the tension field model of membranes is proposed, and wrinkle phenomena inherent in membranes are clarified.Concepts of modularized structures are often seen in artifacts and things in nature. In artifacts it has been considered that modules are subsystems arranged based on each function from the viewpoints of manufacturing, test, transportation and analysis. In things in nature their systems consist of congruent and/or similar modules, which have the same functions. Introducing the same modules to artifacts hierarchically, possibility for other directions of structure systems, which are different from the conventional ones, is shown through the analysis of two-dimensional truss structures.Concerning wrinkle phenomena, analytical approaches using finite elements based on the tension field model are studied, and strict analyses using nonlinear finite shell elements are performed. Experimental analysis of square membranes is also carried out Consequently, a new modification scheme of the stress-strain tensor is proposed, which is quite effective for wrinkled membranes. Various characteristics of wrinkle phenomena are also clarified, and it is noted that boundaries of membranes strongly affect the phenomena.

未来的空间结构系统要求具有功能多样性、可扩展性和冗余性。模块化薄膜展开结构有可能提出新的结构概念来满足这一要求。为了进行研究，有必要澄清模块化结构的概念，并分析索和膜的力学特性。这两个问题都是目前结构工程中的难题，还没有建立起充分的解决方法。本文通过引入模块化结构概念，重新审视结构系统的含义，提出了一种基于膜的张力场模型的有限元分析方法，阐明了膜中固有的褶皱现象。在人工制品中，从制造、测试、运输和分析的角度来看，模块被认为是基于每个功能排列的子系统。在自然界的事物中，它们的系统由相同和/或相似的模块组成，这些模块具有相同的功能。通过对二维桁架结构的分析，将相同的模块分层次地引入到工件中，展示了结构系统不同于传统方向的其他方向的可能性。针对褶皱现象，研究了基于张力场模型的有限元分析方法，并采用非线性有限壳元进行了严格的分析。并对方形薄膜进行了实验分析，提出了一种新的应力应变张量修正方案，该方案对褶皱薄膜的应力应变张量修正十分有效。褶皱现象的各种特性也被澄清，并指出，膜的边界强烈影响的现象。