A tensural displacement amplifier employing elliptic-arc flexure hinges

Flexure-based compliant mechanisms are becoming increasingly promising in precision engineering, robotics, and other applications due to the excellent advantages of no friction, no backlash, no wear, and minimal requirement of assembly. Because compliant mechanisms have inherent coupling of kinematic-mechanical behaviors with large deflections and/or complex serial-parallel configurations, the kinetostatic and dynamic analyses are challenging in comparison to their rigid-body counterparts. To address these challenges, a variety of techniques have been reported in a growing stream of publications. This paper surveys and compares the conceptual ideas, key advances, and applicable scopes, and open problems of the state-of-the-art kinetostatic and dynamic modeling methods for compliant mechanisms in terms of small and large deflections. Future challenges are discussed and new opportunities for extended study are highlighted as well. The presented review provides a guide on how to select suitable modeling approaches for those engaged in the field of compliant mechanisms.

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“…Other studies such as those in Refs. [195] and [196] can be also regarded as a variation of elastic beam theory.…”

Section: Keymentioning

confidence: 99%

Kinetostatic and Dynamic Modeling of Flexure-Based Compliant Mechanisms: A Survey

Ling

Howell

Cao

et al. 2020

Applied Mechanics Reviews

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154

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“…To expand the family of lamina emergent torsional (LET) joints, researchers developed LET joints with a large displacement such as ODLET [23], LET array for circuit board product [24], and spatial LET joints [25,26]. In order to analyze behaviors of a LEM's flexure hinges, several methods have been developed, including the closed-form model [24], compliance matrix method [25,27,28], semianalytic model [29], finite element method [30], and pseudorigid-body model [31]. Besides, researches proposed advanced analytical methods to model a nonlinear relation of load versus displacement, e.g., analytical models for spatial compliant parallel modules [32], a simplified pseudo-rigidbody model method for spatial multibeam modules [33], position-and space-based design of a symmetric spatial compliant mechanism [34], nonlinear kinetostatic modelling for parallel manipulator [35], and normalization-based approach [36].…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of a TLET‐Type Flexure Hinge

Chau

Tran

Dao

2020

Advances in Materials Science and Engineering

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In order to permit a large deflection, three lamina emergent torsional flexure hinges are reconfigured to create a new triple LET-type flexure hinge (TLET) in this paper. The TLET consists of flexure hinges in a series coupled with others in parallel configuration. This arrangement is aimed to enhance the displacement of the joint. The proposed joint is capable of generating a large displacement and a large capacity of load within safety working conditions. The closed-form models are derived to calculate the equivalent spring constant, rotation angle, and displacement of the proposed joint. Failure analysis of the TLET joint with different materials is conducted by finite element analysis. The closed-form models are validated by simulations and experimentations. The validated results are well coincided each other. The result found that the joint achieves a maximum large displacement of 16.97 mm in the x-axis with respect to a maximum load of 20 N. When the joint slides a maximum displacement of 16.97 mm along the x-axis, the output displacement emerges out the z-axis up to 23.12 mm, respectively. The joint can achieve an angle displacement of 38.92°. The displacement of the TLET joint is 2.4 times greater than that of the traditional LET joint. The proposed joint is considered for engineering applications where a large working stroke and a large capacity of load are expected.

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“…Traditional compliant joints can be commonly divided into two types. One is the notched joint whose integrated design often makes the motion range very small and is more suitable for micromanipulation robot [28][29][30][31]. e other is the leaf spring joint mostly used for large deformation [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Rigid‐Flexible Parallel Mechanism for a Neck Brace

Liu

Yan-xia

Zhang

et al. 2019

Mathematical Problems in Engineering

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A rigid-flexible parallel mechanism called 3-RXS mechanism as a neck brace for patients with head drooping symptoms (HDS) is presented. The 3-RXS neck brace has a simple and light structure coupled with good rotation performance, so it can be used to assist the neck to achieve flexion and extension, lateral bend, and axial torsion. Firstly, to prove that the X-shaped compliant joint has a rotational degree of freedom (DoF) and can be used in the 3-RRS spherical parallel mechanism (3-RRS SPM), the six-dimensional compliance matrix, axis drift, and DoF of the X-shaped compliant joint have been systematically calculated. Secondly, the 3-RXS mechanism and its pseudo-rigid-body model (PRBM) are obtained by replacing the revolute pair with the X-shaped compliant joint in the 3-RRS SPM. The rotation workspace of the 3-RXS mechanism is also performed. Finally, to verify the rotation function and effect of 3-RXS mechanism for neck-assisted rehabilitation, the kinematics simulations of the 3-RXS and 3-RRS mechanisms are carried out and compared with the theoretical result, and a primary experiment for rotation measurement of 3-RXS mechanism prototype is carried out. All results prove the feasibility of the 3-RXS mechanism for a neck brace.

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A tensural displacement amplifier employing elliptic-arc flexure hinges

Cited by 71 publications

References 39 publications

Kinetostatic and Dynamic Modeling of Flexure-Based Compliant Mechanisms: A Survey

Kinetostatic and Dynamic Modeling of Flexure-Based Compliant Mechanisms: A Survey

Design and Performance Analysis of a TLET‐Type Flexure Hinge

Design and Analysis of a Rigid‐Flexible Parallel Mechanism for a Neck Brace

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