Structure Design And Kinematic & Dynamic Analysis Research For Spatial Deployable Structures

The deployable space structure is a new type of space architecture that developed expeditiously in recent 40 years and is used in from communication satellite to space station widely. New space technology requires lighter weight and higher shape accurate reflectors, bigger stowed volume ratio and high reliability for deployed, etc. In this dissertation a systematic research is made in construction ideas, design practice, deploying kinetic and dynamic analysis, and intrinsic structure mechanics problems for deployable structures.A classification is made to deployable structures on the viewpoint that the person with a fine classification knowledge can have a good idea to choose a practical method to design and realize the deployable structures. Further, concept design for deployable structure is developed in this paper. Here a four-layer hierarchy concept for concept design is presented. In different layer designer can select a rational model or bring forth a new model and only when he wake up to the hierarchy concept, he can put all irons in the fire. About the first layer, some frequently asded questions(FAQs) are enumerated. At the same time according solution are released. That a design is successful or not has a tight connection with member design. About the second layer, it is the right place new idea comes from. Later a tri-rod-hinge structure is brought forward, which is just based on the second layer. About the third one, name as extra-element, differs from the second one just on that the former has a rigid piece. Extra-element concept enlarges the element library and enhances the possibility for inventing new structures. As to fourth layer, the light is put on integration the element and extra-element. In fact, many designs can not depend on a type of element or an extra-element. A good arrangement is necessary for the fourth layer concept design. Later a scheme for stiffness improvement of integration deployable structures is shown. The scheme is grounded on the concept design.Four kinds of schemes of deployable structures are proposed. The first one is deployable prism-shaped mast. The main effort is to solve the initial driving force. During the research we observed that the torsion spring at the middle node could lessen the scale of driving force obviously. Model dynamic appearance is torsion deformation. To minish the friction force between the slide node and horizontal strut, the least contact area is necessary. The second one is a tri-rod-hinge model. It has a better 3-D stiffness, dynamic characteristic and lighter mass compared to scissor-like model. The third model is hexahedron element with flexible strut. Only diagonal strut has tension spring, so that the diagonal strut can change its length by straight-line spring. As the pre-tensioned springs shrink, the structure deploys in synchronization. Until reaching its design position geometry, it is locked into a stable structure. It has character of high stiffness, high stability and can be manufactured easily. The main job is to construct concisely bend face by method named Equal Projection Dimension and Equally Bulging Scale (EPDEBS). But there is a remaining question how to deal with harmony among the elements. The numeration process of best-anastomosed parabolic face is shown and the result shows that the gravity effect is not neglectable and whether treating the diagnose strut as a rod or not has not effects to the result remarkable. The forth model is integrated by tetrahedral elements from central element. The basic tetrahedral element consists of six struts. The length of three abdominal struts is not changed during deploying processing. Other three on the base plane have foldable nodes, which areequipped with a torsion spring, so that tetrahedral element can be foldable. The torsion spring is in pre-stress situation when stowed and deploy automatically after release. The elastic energy can keep the parabolic face. The main job for the model is to determine the guideline for whole deploying. The guideline is that length of...