A new Bricard-like mechanism with anti-parallelogram units. (May 2020)

• Record Type: Journal Article
• Authors: Sun, Xuemin; Li, Ruiming; Xun, Zhiyuan; Yao, Yan-An
• Is Part Of: Mechanism and machine theory. Volume 147(2020)
• Publication Date: 2020-05
• Subjects: Bricard -- Anti-parallelogram -- Overconstrained -- Kinematic paths -- Deployable mechanism; Machine theory -- Periodicals; Machinery -- Periodicals; Machines -- Périodiques; Génie mécanique -- Périodiques; Machine theory; Machinery; Periodicals; 621.81
• DOI: 10.1016/j.mechmachtheory.2019.103753
• Languages: English
• ISSNs: 0094-114X

Abstract

Highlights: A Bricard-like mechanism composed of three anti-parallelogram units is designed. The mechanism is simplified as a spatial 6R with variable links' lengths. The D-H parameters and kinematics of the equivalent 6R mechanism are analyzed. A triangular prism deployable mechanism composed of four units is fabricated. Abstract: This paper proposes a new Bricard-like mechanism composed of three anti-parallelogram units. First, the configuration and connection of the Bricard-like mechanism are given. Second, the mechanism is simplified as a spatial single-loop overconstrained 6R mechanism with variable links' lengths and its Denavit-Hartenberg (D-H) parameters are obtained by identifying the six revolute joints axes. Third, the degree of freedom of the mechanism is calculated through the closure equations, and kinematic paths of output variables are plotted with respect to the input variable. Then, a serial of Bricard-like mechanisms are connected to construct the deployable mechanism. Finally, three prototypes of the Bricard-like mechanism and the triangular prism deployable mechanism composed of four Bricard-like mechanisms are designed and fabricated to verify the feasibility of the proposed method and analysis.