Article
Computer Science, Interdisciplinary Applications
Yifu Lu, Liyong Tong
Summary: The extended algorithm presented in this article utilizes the MIST method for topology optimization of compliant mechanisms and structures, modeling the fluid-structure interface using equivalent virtual strain energy and work, and directly applying design-dependent pressure loadings on the interface boundary. The algorithm is validated through multiple numerical examples, demonstrating its effectiveness in optimizing compliant mechanisms and structures.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Automation & Control Systems
Chih-Hsing Liu, Fu-Ming Chung, Yuan-Ping Ho
Summary: This article introduces a new compliant constant-force mechanism and proposes a new composite objective function for optimizing its design. Experimental results show that the developed constant-force compliant finger can provide a nearly constant output force over a range of input displacements, leading to the design of a three-fingered constant-force compliant gripper for robotic grasping of fragile objects.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Engineering, Multidisciplinary
Qi Chen, Qi Wen, Xianmin Zhang, Yong Yang, Guangming Xie
Summary: This study proposes a topology optimization method for designing hinge-free compliant constant-output-force mechanisms. By introducing a constraint for preventing bifurcation and utilizing a minimum scale constraint method, the optimization design and fabrication of the optimized CCFM are achieved and tested. The optimized CCFM exhibits a small force variation over the constant-force stroke, showing competitiveness.
ENGINEERING OPTIMIZATION
(2022)
Article
Engineering, Multidisciplinary
Helio Emmendoerfer Jr, Kurt Maute, Eduardo Alberto Fancello, Emilio Carlos Nelli Silva
Summary: This work presents a level set-based approach for designing multi-material compliant mechanisms subject to local stress constraints. The approach utilizes the Multi-Material Level Set (MM-LS) model for topology description and incorporates stress constraints and volume constraints into the objective function through an augmented Lagrangian technique. The proposed approach is applicable to any number of materials and has been demonstrated to be effective through numerical results.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Analytical
Chia-Nan Wang, Fu-Chiang Yang, Van Thanh Tien Nguyen, Quoc Manh Nguyen, Ngoc Thai Huynh, Thanh Thuong Huynh
Summary: The study designed compliant mechanism flexure hinges using grey relational analysis, with experiment results confirming high consistency with predictions. Design dimensions significantly affected equivalent stress and displacement, with an obtained displacement amplification ratio of 65.36 times compared to the initial design.
Article
Engineering, Aerospace
Xinxing Tong, Wenjie Ge, Zhenyi Yuan, Dajing Gao, Xinqin Gao
Summary: The paper discusses the optimization design of compliant mechanisms based on morphing trailing edges, integrating composite material design and utilizing a two-step optimization strategy to achieve deformation capabilities. By introducing lamination parameters and evaluating actual vs desired displacements, an integrated optimization model for composite morphing trailing edges is established, showing approximately 8 degrees of bending and meeting design requirements.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Mechanical
Qi Chen, Qi Wen, Xianmin Zhang, Yong Yang, Suhua Xiao
Summary: This study analyzes the causes of buckling-induced instability and proposes methods to avoid this instability. By proposing a mechanism with three torsional springs and using topology optimization models with buckling constraints, stable compliant constant-force mechanisms can be designed.
MECHANISM AND MACHINE THEORY
(2024)
Article
Mathematics, Applied
K. Miyajima, Y. Noguchi, T. Yamada
Summary: Stress-constrained topology optimization is used to design compliant displacement magnification mechanisms. The objective function is formulated based on effective energy, eliminating the need for artificial spring components at the output and input ports. The method allows for the design of mechanisms that do not receive reaction forces at the output port, such as sensors, and avoids problems like stress concentration by imposing a constraint on maximum stress. Numerical examples are provided to demonstrate the effectiveness of the proposed method.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Wenjie Ge, Xin Kou
Summary: This study presents a design method for multi-material compliant mechanisms, utilizing material distribution with different elastic moduli to meet rigid and flexible requirements. The Solid Isotropic Material with Penalization (SIMP) model is used for parameterization, and the topology optimization design model is established with a solution for oversaturation in volume constraints. The proposed method demonstrates effectiveness through widely studied numerical examples.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Chaitanya Dev, Gabriel Stankiewicz, Paul Steinmann
Summary: We propose a sequential topology and shape optimization framework for designing compliant mechanisms with boundary stress constraints. Our approach utilizes a density-based topology optimization method to generate the configuration of the mechanisms and a node-based shape optimization method for obtaining an exact boundary representation. Stress constraints are imposed to avoid impractical hinges with point connections, either locally on the nodes of the boundary or globally using P-norm stress constraints in the domain. Moreover, our method incorporates an adaptive shape refinement strategy to increase the design space and capture fine-scale geometry details. Numerical experiments demonstrate the effectiveness of our approach in designing compliant mechanisms with stress constraints.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Mechanics
Minh Ngoc Nguyen, Minh Tuan Tran, Hung Quoc Nguyen, Tinh Quoc Bui
Summary: This paper presents an extension of the Proportional Topology Optimization (PTO) algorithm for solving multi-material topology optimization problems in compliant mechanisms. The objective function is transformed to maximize mutual strain energy, and the contribution of each element is evaluated to apply the PTO algorithm. The problem is decomposed into sub-problems using the alternating active phase algorithm (AAPA) for multiple materials. The developed approach is demonstrated through numerical examples.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Engineering, Multidisciplinary
Gabriel Stankiewicz, Chaitanya Dev, Paul Steinmann
Summary: In this work, a sequential topology and shape optimization framework is used to design compliant mechanisms, focusing on the refined design of flexure hinges through shape optimization in a geometrically nonlinear setting. Enhanced adaptive shape and domain refinement strategies are proposed, along with local stress constraints and a curvature constraint for durability and manufacturability. The novelties of this work include improved adaptive strategies, geometrically nonlinear optimization, and an adapted traction method with curvature constraint.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Shuhao Xia, Nianfeng Wang, Bicheng Chen, Xianmin Zhang, Wei Chen
Summary: This paper proposes a novel topology optimization method that integrates the layout of supports, links and material distribution for designing partially compliant mechanisms. The method introduces new design variables to represent the states of supports and links, and incorporates a nonlinear spring model for unified modeling. Sensitivity analysis is conducted using the adjoint equation method to verify the versatility and flexibility of the proposed method. The accuracy of the nonlinear spring model is demonstrated through numerical examples.
COMPUTERS & STRUCTURES
(2024)
Article
Engineering, Multidisciplinary
Hongjia Lu, Linwei He, Matthew Gilbert, Filippo Gilardi, Jun Ye
Summary: Additive manufacturing (AM) has rapidly developed and offers the potential to fabricate structurally optimized components. The use of truss topology optimization methods has been effective in identifying optimal forms for highly design free components. However, geometric complexity and overhanging elements often require support structures when using traditional 3-axis AM machines. To eliminate the need for support structures, multi-axis AM machines with 5 or more axes can be used. A novel process-aware truss layout optimization strategy tailored for multi-axis AM machines is proposed in this study, which combines curved printing surface identification with truss layout and geometry optimization. The proposed strategies aim to achieve highly material-efficient structures and fully self-supporting structures with minimal material consumption. The effectiveness of the approach is demonstrated through several examples, showing that fully self-supporting optimized structures can be identified without sacrificing structural performance.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Engineering, Mechanical
Fanyi Guo, Zhili Sun, Shengnan Zhang, Runan Cao, Haiyang Li
Summary: This paper proposes two optimized designs of an advanced compliant stroke amplification mechanism (CSAM) with completely distributed compliance. The dimensions of the CSAM are improved based on linear analytical models. Finite element simulations and nonlinear analytical models are used to verify the optimization results and analyze the sensitivity of failure probability to manufacturing errors.
MECHANISM AND MACHINE THEORY
(2022)
