A constant-force bistable micromechanism

Wang, Dung-An; Chen, Jyun-Hua; Pham, Huy-Tuan

doi:10.1016/j.sna.2012.10.042

Cited by 28 publications

(13 citation statements)

References 12 publications

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“…Bistable structures for advanced functional systems. They have been explored for a variety of applications, including actuators [29,45,50] energy harvesting, [3,147] robotics [79] and MEMS, [160] energy absorption, [150] and metamaterials and programmable materials. [105] that the employment of compliant and smart materials may help overcome the technical challenges while taking advantage of the topology design, as shown in the section of soft robotics.…”

Section: Actuators Based On Mechanically Driven Bistable Structuresmentioning

confidence: 99%

Section: Bistable Structures For Energy Absorptionmentioning

confidence: 99%

“…The designed structure acts as a protection mechanism against high impact forces by snap-through from its initial state to an overloaded stable state. Reproduced with permission [160]. Copyright 2013, Elsevier.…”

mentioning

confidence: 99%

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Bistable Structures for Advanced Functional Systems

Cao

Derakhshani

Fang

et al. 2021

Adv Funct Materials

122

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Bistable mechanical systems having two local minima of potential energy can rest in either of the two stable equilibrium states in the absence of external loadings. A snap-through action may occur under suitable stimuli and/or loading, during which such systems exhibit distinct properties from linear structures. Such kinds of structures have been widely exploited for designing advanced functional systems for a variety of applications. Here, the advances of bistable structures are summarized for novel advanced functional systems, including actuators, energy harvesters, microelectromechanical systems (MEMS), robotics, energy absorbers, and programmable devices as well as metamaterials. The controllable snap-through motions are highlighted in the nonlinear structures of bistability/multistability. Finally, the major principles, structures, pros and cons, and the future research directions along with its challenges are discussed.

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Section: Actuators Based On Mechanically Driven Bistable Structuresmentioning

confidence: 99%

Section: Bistable Structures For Energy Absorptionmentioning

confidence: 99%

See 1 more Smart Citation

Bistable Structures for Advanced Functional Systems

Cao

Derakhshani

Fang

et al. 2021

Adv Funct Materials

122

View full text Add to dashboard Cite

show abstract

“…To name a few, the constant-force mechanism with bistable flexure hinges is proposed in the literature [27,28]. In addition, the constant force is obtained by the shape optimization of the lateral beams (which is cubic Bezier curve) and inner beams of a cosine curve in reference [29]. Another way is reported in reference [30], which is based on stiffness nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Design, Analysis and Testing of a New Compliant Compound Constant-Force Mechanism

Zhang

Wang

2018

Actuators

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This paper presents the design and testing of a novel flexure-based compliant compound constant-force mechanism (CCFM). One uniqueness of the proposed mechanism lies in that it achieves both constant-force input and constant-force output, which is enabled by integrating two types of sub-mechanisms termed active and passive constant-force structures, respectively. Unlike conventional structures, the active constant-force structure allows the reduction on input force requirement and thus the enlargement of motion stroke provided that the maximum stress of the material is within allowable value. While the passive one offers a safe environmental interaction during the contact process. Analytical model of the proposed CCFM is derived which is verified by simulation study with finite element analysis (FEA). A prototype mechanism is fabricated by a 3D printer to demonstrate the performance of the proposed CCFM design. Experimental results reveal the effectiveness of the reported CCFM.

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“…Similar to Pham and Wang, 19 Wang et al. 20 designed a constant-force bistable micromechanism and its constant-force property was validated experimentally. Parlaktaş 21 developed a novel constant-force mechanism by employing the compliant spatial slider–crank mechanism, and the experimental results have been proved consistent with the design theory.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental validation of a cam-based constant-force compression mechanism with friction considered

Cheng

Xie

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Due to the quasi-zero-stiffness and overload protection characteristics, constant-force mechanisms can be widely used in nonlinear vibration control, high-efficiency shock isolation, and other engineering fields. As a preparatory work for the further applications, this paper presents a cam-based constant-force compression mechanism and validates the quasi-static characteristics experimentally. By employing the friction considered profile identification method to design the cam and through the interaction between the cam and spring-sliders, the constant-force compression mechanism can passively output the desired constant force over a sufficiently large displacement. The design theory is firstly introduced in detail. Through establishing and solving the differential relationship between the lateral elastic force and vertical constant force, the constant-force compression mechanism under various frictional conditions can be designed. Then, constant-force compression mechanism prototypes corresponding to sliding and rolling friction are designed, fabricated and tested respectively. The results show that both the prototypes have the satisfactory characteristics as with the design requirements. Moreover, the relative generality and stronger engineering applicability of the proposed friction considered profile identification method are proved since it can not only cover the frictionless (micro-friction) cases, but keep the constant-force behavior of the constant-force compression mechanism under the nonignorable friction conditions. Therefore, compared with the existing cam-roller constant-force mechanisms that must ensure the ignoring micro-friction demand, the presented constant-force compression mechanism taking friction into consideration has important engineering significance since it can reduce this machining requirement.

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A constant-force bistable micromechanism

Cited by 28 publications

References 12 publications

Bistable Structures for Advanced Functional Systems

Bistable Structures for Advanced Functional Systems

Design, Analysis and Testing of a New Compliant Compound Constant-Force Mechanism

Design and experimental validation of a cam-based constant-force compression mechanism with friction considered

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