... ( θ s ) from its initial position as shown in Figs. 2 and 3 . It should be noted that in a regular Kresling truss module, all the joints are ternary joints but in case of NPFT modules, all the joints are converted into binary joints which in turn simplify the deployment mechanism and its...

...Jieyu Wang; Xianwen Kong; Jingjun Yu This paper presents a series of deployable mechanisms based on n-UU (universal joint) Wren parallel mechanism (PM) units, which undergo one degree-of-freedom (DOF) Borel–Bricard motion. First, the PM unit is developed into ortho-planar mechanisms by adopting...

... layouts, comparing with the same type of most existing mechanisms. This paper is organized as follows. In Sec. 2 , the topological structure design of the double-ring truss deployable antenna mechanism is presented. In Sec. 3 , DOF analysis of the deployable unit and the deployable mechanism...

... of the linkage are exhibited. The straight-line linkage has relatively simple joint layouts and kinematics model and can be used as a deployable unit to construct some special deployable mechanisms. The linkage consists of an 8R (R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 ) external loop linkage...