Double-ring Deployable Antenna Mechanism Based on Square Frustum-shaped Bricard Units

doi:10.3901/JME.2023.21.147

Abstract

Abstract: The stiffness of the single-ring truss deployable antenna decreases with the increasing diameter, which hinders the enlargement of the antenna. Based on spatial over-constrained square frustum-shaped Bricard units, a double-ring deployable antenna mechanism is proposed. First, a square frustum-shaped Bricard unit, whose deployed configuration has the same geometric constraints as the square frustum, is synthesized by the isosceles trapezoidal plane-symmetric Bricard linkage. Then, the constraint equation between twist angles in square frustum-shaped Bricard units is deduced on condition that there is always a set of orthogonal symmetry planes. The square frustum-shaped Bricard unit, which satisfy the constraint equation, have the characteristic of one degree of freedom, and bundle-folding. Finally, a double-ring truss deployable antenna mechanism with a diameter of 5 m is constructed of square frustum-shaped Bricard units. This research provides an over-constrained mechanism scheme for the double-ring truss deployable antenna mechanism, which improves the utilization rate of the truss and facilitates wide engineering applications of the plane-symmetric Bricard linkages.

Key words: double-ring truss antenna, deployable mechanism, spatial over-constrained linkage, plane-symmetric Bricard linkage

CLC Number:

TH112

YAO Pengfei, LÜ Shengnan, ZHANG Wuxiang, DING Xilun. Double-ring Deployable Antenna Mechanism Based on Square Frustum-shaped Bricard Units[J]. Journal of Mechanical Engineering, 2023, 59(21): 147-156.

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