Design Of Deployable Structure Of Small Satellite Solar Panels

Recently,rigid origami has been widely used in aerospace,architecture,military engineering and other fields because of its superiorly foldable properties.It has great potential in the application of small satellite solar panels.However,origami-based mechanisms have two main shortcomings.One is that some origami-based mechanisms are not easily controlled because of multiple degrees of freedom(DOF).The other one is that the transformation from zero-thickness mathematical model to thick-panel model leads to interference.In order to solve this problem,a series of single-DOF structures are inspired from origami to support the folding of deployable small satellites' solar panel.The main work of this thesis is as follows:First of all,the basic origami structure has the process of wrapping folding.Based on the wrapping of flat membranes with a circular hub,an origami pattern which has a hexagon hub has been displayed.And then it evolved into an origami pattern with a square hub and carried out kinematic analysis.The number and folding direction of creases of origami pattern with a square hub are adjusted.And an origami structure which can be folded into a box is proposed and its folding process meets the expected design requirement of deployable small satellites' solar panel.Secondly,a single degree of freedom rigid origami is constructed by using the method of vertex splitting and mechanism theory.In order to setting up the installation space of the revolute pair,the method of vertex splitting is proposed and the specific geometric parameters of the structure are calculated after vertex splitting.Then,the kinematic analysis of the origami is carried out.In order to ensure compatibility of the origami,this paper puts forward three methods,adding a crease,changing the direction of creases and reducing the number of split vertexes to release the DOF of the origami.By analyzing the new origami patterns derived from three methods,three rigid origami with single-DOF are constructed.Finally,on the basis of single-DOF rigid origami patterns,the design of the thick-panel patterns and their tessellations are carried out.By comparing several methods to accommodate the thickness of panels,e.g.,offset-joint,flexible joint,doubled joint,tapered panel and offset-panel,it is found that the offset-panel method has good motion and retains range of movement.Then,the offset-panel technique is chosen to accommodate the thickness.We construct three thick-panel patterns basing on the adding crease pattern,the splitting three-vertex pattern and the symmetric pattern,respectively.In addition,through analysis,the relationship between the design parameters and the expansion/packaging ratio are established and optimized.In order to improve the expansion/packaging ratio,tessellation of the symmetric pattern is studied.Two ways for tessellation are proposed along horizontal and vertical directions respectively.Through the motion of the mechanism,the characteristics of single degree of freedom and the ratio of folding and expansion are verified.Finally,two kinds of thick-panel tessellation with single degree of freedom are obtained.