Complaint constant force mechanism using variable stiffness leaf-spring-like beam: Design and experiment

Jiehui Su; Guangwei Wang; Chengxi Zhang

doi:10.3934/mfc.2022035

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2022. Doi: 10.3934/mfc.2022035

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Complaint constant force mechanism using variable stiffness leaf-spring-like beam: Design and experiment

1.
School of Mechanical Engineering, Guizhou University, Guiyang 550025, China
2.
School of Internet of Things Engineering, Jiangnan University, Wuxi 214000, China
3.
Key Laboratory of Advanced Control for Light Industry Processes of the Ministry of Education, Jiangnan University, Wuxi 214000, China

^*Corresponding author: Guangwei Wang
^*Corresponding author: Guangwei Wang

Received: June 2022

Revised: August 2022

Early access: September 2022

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Abstract

This research provides a design for a complaint constant-force mechanism employing a leaf-spring-like beam with variable stiffness to address the negative stiffness stroke underutilization issue of the bistable beam. By designing the compression of the leaf-spring-like beam at each given displacement and the compression ramp slope, this technique allows the constant force mechanism to potentially take full utilization of the bistable beam's negative stiffness component. Innovative design of a complaint constant force mechanism based on positive and negative stiffness is shown in this study. In addition, we conduct simulation analysis and experimental verification. The experimental results illustrate the feasibility and effectiveness of the proposed method.

Keywords:

Mathematics Subject Classification: Primary: 58F15, 58F17; Secondary: 53C35.

Citation:

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Figure 1. Stress contour of bistable beam's deformation

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Figure 2. Schematic diagram of establishing a coordinate system

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Figure 3. The force analysis of beam

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Figure 4. The bistable beam and its force

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Figure 5. Schematic diagram of the spring-like beam

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Figure 6. Force analysis on the spring-like beam

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Figure 7. The model of the proposed constant force mechanism

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Figure 8. Force-displacement curves before and after optimization. A: preload strok. B: constant force stroke. C: failure stroke

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Figure 9. The experimental setup

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Figure 10. Force-displacement experimental results. A: preload strok. B: constant force stroke. C: failure stroke

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