Topological synthesis of fluidic pressure-actuated robust compliant mechanisms

Kumar, P and Langelaar, M. (2022) Topological synthesis of fluidic pressure-actuated robust compliant mechanisms. Mechanism and Machine Theory, 174. pp. 1-22. ISSN 0094-114X

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This paper presents a robust density-based topology optimization approach for synthesizing pressure-actuated compliant mechanisms. To ensure functionality under manufacturing inaccuracies, the robust or three-field formulation is employed, involving dilated, intermediate and eroded realizations of the design. Darcy's law in conjunction with a conceptualized drainage term is used to model the pressure load as a function of the design vector. The consistent nodal loads are evaluated from the obtained pressure field using the standard finite element method. The objective and load sensitivities are obtained using the adjoint-variable approach. A multi-criteria objective involving both the stiffness and flexibility of the mechanism is employed in the robust formulation, and min–max optimization problems are solved to obtain pressure-actuated inverter, gripper, and contractor compliant mechanisms with different minimum feature sizes. Limitations of the linear elasticity assumptions while designing mechanisms are identified with high pressure loads. Challenges involved in designing finite deformable pressure-actuated compliant mechanisms are presented. © 2022 Elsevier Ltd.

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Item Type: Article
Additional Information: The authors would like to thank Prof. Krister Svanberg for providing MATLAB codes of the MMA optimizer. P. Kumar acknowledges financial support from the Science & Engineering research board, Department of Science and Technology, Government of India under the project file number RJF/2020/000023.
Uncontrolled Keywords: 3D-Printing, Follower forces, Geometric nonlinearity, Pressure-driven compliant mechanisms, Robust formulation, Soft robots
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 21 Jun 2022 06:16
Last Modified: 22 Jun 2022 08:56
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