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A New Compliant Joint with Thin-Wall Structure

Authors: 

Ngoc Le Chau, Ngoc Thoai Tran, Thanh-Phong Dao

Source title: 
Arabian Journal for Science and Engineering, 2022 (ISI)
Academic year of acceptance: 
2021-2022
Abstract: 

Compliant joint plays a vital role in micro-positioning systems, robotics, and precision instruments due to its friction-free and fine motion. However, the existing joints are limited in range of motions and degrees of freedom. Thus, this paper proposes a new compliant joint (CJ) which is inspired from the dragonfly’s wing. The proposed joint can provide two translational motions with a large range of motion. The CJ has six curvilinear shapes which are arranged in a parallel architecture. Besides, the proposed joint has a thin-wall structure to enlarge the deformation capacity. Based on the Euler–Bernoulli beam theory, the analytical model is established to describe the stiffness and displacement of the joint. Effects of the joint’s geometries on the stiffness are investigated. The deformation and load capacities of the CJ are determined. The results showed that the displacement of the CJ in the y-axis is increased to 43.5% and 5.95% in comparison with the circular notch hinge and rectangular flexure hinge, respectively. Besides, the results determined that the displacements of the CJ in the x-axis are 58.57 times and 51.25 times larger than those of the traditional flexure hinges, respectively. The errors between the simulation, analytical model, and experiment are around 5%. It means that the closed-form model is validated for the proposed joint. The proposed CJ is a potential joint for micro-positioning technologies.