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Design of a flexure-based mechanism possessing low stiffness and constant force
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Tian, Yanling, Zhou, Chongkai, Wang, Fujun, Lu, Kangkang, Yuan, Yanjie, Yang, Mingxuan and Zhang, Dawei (2019) Design of a flexure-based mechanism possessing low stiffness and constant force. Review of Scientific Instruments, 90 (10). 105005. doi:10.1063/1.5119276 ISSN 1089-7623.
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Official URL: https://doi.org/10.1063/1.5119276
Abstract
This paper presents a novel design of a flexure-based constant force mechanism with a long travel stroke. Unlike the conventional force control method using a force sensor and feedback controller to obtain constant force output, the proposed compliant mechanism provides a constant force utilizing the unique mechanical property of the mechanical structure. The constant force is generated by using the combination of a negative-stiffness and a positive-stiffness mechanism. In order to achieve a low driving force, the negative stiffness is realized by a special bistable beam, which is a step beam with structural holes. Meanwhile, the positive stiffness is generated by the leaf flexure hinges with structural holes. The regular structural holes can reduce the mass and stiffness of the whole mechanism. Furthermore, the elliptic integral method and the pseudo-rigid-body approach are utilized to establish the model of the constant force mechanism. Based on the established model, the performance of the constant force mechanism is evaluated computationally. Additionally, the parametric model of the proposed mechanism is investigated using the nonlinear finite element analysis. Finally, a prototype is fabricated using 3D printing technique. The open-loop and the closed-loop experimental tests are implemented to investigate the performance of the developed constant force mechanism. It is noted that the constant force mechanism can be robustly controlled by a proportional-integral-derivative control method. Experimental results demonstrate that the developed constant force mechanism has a constant force with slight fluctuation with a range of 500 μm.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Flexure -- Design, Mechanical movements | ||||||||||||||||||||||||||||||
Journal or Publication Title: | Review of Scientific Instruments | ||||||||||||||||||||||||||||||
Publisher: | AIP Publishing | ||||||||||||||||||||||||||||||
ISSN: | 1089-7623 | ||||||||||||||||||||||||||||||
Official Date: | October 2019 | ||||||||||||||||||||||||||||||
Dates: |
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Volume: | 90 | ||||||||||||||||||||||||||||||
Number: | 10 | ||||||||||||||||||||||||||||||
Article Number: | 105005 | ||||||||||||||||||||||||||||||
DOI: | 10.1063/1.5119276 | ||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | “This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Cite as: Rev. Sci. Instrum. 90, 105005 (2019); https://doi.org/10.1063/1.5119276 Submitted: 10 July 2019 . Accepted: 23 September 2019 . Published Online: 21 October 2019 and may be found at https://doi.org/10.1063/1.5119276 | ||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||
Date of first compliant deposit: | 22 January 2020 | ||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 21 October 2020 | ||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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