Design and Analysis of a Large Volume Deployable Parabolic Antenna Mechanism
|School||Harbin Institute of Technology|
|Course||Mechanical and Electronic Engineering|
|Keywords||deployable/foldable mechanism Bricard mechanism antenna structure elasto-dynamic|
With the further exploration and the development of related space technology,space deployable antenna applied on satellites and space stations is developing towardslarge-scale and high precision. Past researches on truss structure for deployable antennamostly focus on planar structure. Spatial deployable structure mechanism can provideextra stiffness and high expansion/packaging ratio and some academics have developedBricard mechanism as deployable single loop mechanism which can build blocks forconstruction of large deployable structures. In this thesis, the author utilizes the singleloop as bases to construct three novel model mechanisms which can be expanded todeployable network and choose the "Y" shape tripod mechanism which is based on thegeneral line-symmetric case of Bricard mechanism to build deployable parabolicantenna due to geometric characteristic of discredited surface.In this thesis, the connection between different linkages and the method toconstruct large network are given. The kinematic of Bricard mechanism and theproposed novel mechanism is studied and understand the relationship of different joints.Due to a lot of linkage in proposed mechanism and single DOF it has, chooseKane‘s Equation to build dynamic models of Bricard mechanism and the tripodmechanism. To simulate the real deploy process, the elasto-dynamic model and thecomparison of the elastic displacement of different linkages are given.After the deployment, the whole mechanism is stiffened as a fixed structure inworking status. So this thesis presents the structure dynamic analysis in ANSYSsoftware. And the influence of some factor such as material and structure parameters isstudies. In aerospace application, mass and natural frequency are two importantparameters, so this thesis provides the optimization of some structure parameters as thereference for actual project.