Research On Trigeminal BRICARD Deployable/Foldable Mechanism And Its Gridding Assembly

With the devolopment of space technology, the sizes of space mechanisms are larger and larger. Yet the carrying capacity of rockets or other transport equipments cannot be enlarged effectively because of the limits of driving power and cost. As deployable/foldable mechanism takes up small space when it is folded and it covers large area when it is deployed, it can be a good solution to this problem. Hybrid Bricard linkage can be applied in deployable/foldable mechanism. Trigeminal deployable/ foldable mechanism which is derived from hybrid Bricard linkage is analyzed in this dissertation. Because of few studies about trigeminal deployable/ foldable mechanism and it having some advantages, it is necessary to research it.This dissertation elaborates special shape and geometry condition of trigeminal deployable/foldable mechanism and analyzes why its DOF is one.Based on D H method this dissertation analyzes the Kinematics of trigeminal deployable/foldable mechanism in detail and established Lagrange Dynamics equation. The dynamic differential equation is solved by Matlab programming.This dissertation proposes two ways to assembly which based on Tilings. The performances of these assemblies are analyzed and compared with each other to get their own advantages and disadvantages.Stiffness is a very important indicator to measure the performance of large deployable/foldable mechanism. By ANSYS this dissertation analyzes and compares with the following forms: assembly without ropes, assembly using ropes to stiffness and assembly using rigid rod to stiffness. This dissertation puts forward some ideal forms to stiffness in order that the large deployable/foldable mechanisms could be applied in practice better.