Output decoupling property of planar flexure-based compliant mechanisms with symmetric configuration

Du, Yunsong; Li, T. M.; Jiang, Yao; Zhang, J. L.

doi:10.5194/ms-7-49-2016

Cited by 6 publications

(6 citation statements)

References 25 publications

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“…In some of the presented synthesis approaches, the synthesis additionally requires that “decoupled” mechanisms result (Du et al, 2016; Hao and Li, 2015; Tang and Chen, 2006; Wang and Zhang, 2008; Zhan and Zhang, 2010; Zhu et al, 2018). According to Du et al (2016), decoupling can be divided into output decoupling and input decoupling. The base for the definition is that in each case an input DoF displacement causes a defined displacement in an associated output DoF.…”

Section: Overview Of the State Of The Artmentioning

confidence: 99%

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

Kirmse

Campanile

Hasse

2022

Journal of Intelligent Material Systems and Structures

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Unlike conventional mechanisms, compliant mechanisms produce the desired deformations by exploiting elastic strain. The mobility of a conventional mechanism is the number of independent coordinates needed to define a configuration of the mechanism. The corresponding concept applicable to compliant mechanisms is the so-called pseudo-mobility defined as the number of scalar parameters needed to identify one single desired deformation of a compliant mechanism. In the case of compliant mechanisms with multiple pseudo-mobility, only synthesis approaches for relatively simple mechanisms exist so far, while systems for more complex tasks like shape adaptation are not covered. In addition, only a limited choice of transverse loads are considered in those approaches. In this paper, a novel optimization algorithm is presented that addresses these two shortcomings. This algorithm is based on a two-step iterative procedure in which the load-case dependency of the deformation is minimized and desired deformations are imposed. The algorithm is tested on mechanisms of different complexity. It could be demonstrated that the new procedure is well suited for the synthesis of different types of compliant mechanisms.

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Section: Overview Of the State Of The Artmentioning

confidence: 99%

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

Kirmse

Campanile

Hasse

2022

Journal of Intelligent Material Systems and Structures

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show abstract

Section: Overview Of the State Of The Artmentioning

confidence: 99%

“…In some of the presented synthesis approaches, the synthesis additionally requires that "decoupled" mechanisms result [8,[21][22][23][24][25]. According to [23], decoupling can be divided into output decoupling and input decoupling. The base for the definition is that in each case an input DoF displacement causes a defined displacement in an associated output DoF.…”

Section: Overview Of the State Of The Artmentioning

confidence: 99%

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

Kirmse¹,

Campanile²,

Hasse³

2021

Preprint

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Unlike conventional mechanisms, compliant mechanisms produce the desired deformations by exploiting elastic strain and do not need, therefore, moving parts. The number of degrees of freedom of a conventional mechanism, also called mobility, is the number of independent coordinates needed to define a configuration of the mechanism. Due to the different operating principle, such definition of degree of freedom or mobility cannot be directly applied to compliant mechanisms. While those terms are not able to denote a property of a given compliant mechanism, they are meaningful when applied to the design of a compliant mechanism. Compliant mechanisms are, however, mostly seen as elastic structures, for which the term degree of freedom is used in a different meaning. In order to avoid ambiguities, the term pseudo-mobility (already introduced in previous published work) will be used to denote the number of scalar parameters needed to identify one single desired deformation, i.e. one single deformation for which the compliant mechanism is designed. Many synthesis approaches exist for compliant mechanisms with single pseudo-mobility (commonly referred to as "single degree of freedom mechanisms"). In the case of compliant mechanisms with multiple pseudo-mobility (multiple-degree of freedom mechanisms), only synthesis approaches for relatively simple mechanisms exist so far, while systems for more complex tasks like shape adaptation are not covered. In addition, only certain cases of transverse loads are included in the synthesis with these approaches. In this paper, a novel optimization algorithm is presented that addresses these two shortcomings. The algorithm is tested on a simple mechanism with one translation and one rotation kinematic degree of freedom, a compliant parallel mechanism for pure translation and a shape-adaptive structure.

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“…Recently, Zhu et al 84 proposed a systematic method for designing fully decoupled compliant mechanisms with multiple degrees of freedom by using topology optimization, based on the decoupled compliant positioning methods. [85][86][87] Several examples given in Reference 84 demonstrated that the proposed method is effective. Then, this method was extended to the design 88 of the large-displacement CMs.…”

Section: Introductionmentioning

confidence: 96%

A new method for optimizing the topology of hinge‐free and fully decoupled compliant mechanisms with multiple inputs and multiple outputs

Rong

Luo

et al. 2021

Numerical Meth Engineering

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Compliant mechanisms with multiple inputs and multiple outputs have a wide range of applications in precision mechanics, for example, cell manipulations, electronic microscopes, and so on. The movement uncoupling and maximum desired output displacements among these devices all become critical because many inputs and outputs are involved. The topology optimization design of compliant mechanisms, which can solve output coupling and input coupling problems, hinge and gray region problems, and the multiple-objective optimal problem, is an important topic of researches for achieving fully decoupled motion. It is also a challenge area of research due to serious conflicts of between the four of output and input uncoupling constraints, volume constraint, the hinge-free requirement, and the good black/white solution requirement. In order to comprehensively solve these problems, a simple optimization model overcoming these serious conflicts is posed, which includes small change rate constraints of structural compliances corresponding to the driving input loads and output point virtual loads. Then, the multiple output displacement functions of the model are equivalently converted into non-negative functions. The multiple-objective model is converted into a single-objective optimization model by using a bound variable. The method of moving asymptotes (MMA) algorithm is adopted to solve it. Several examples are presented to demonstrate the validity of the proposed method.

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Output decoupling property of planar flexure-based compliant mechanisms with symmetric configuration

Cited by 6 publications

References 25 publications

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

Topology-optimization based design of multi-degree-of-freedom compliant mechanisms (mechanisms with multiple pseudo-mobility)

A new method for optimizing the topology of hinge‐free and fully decoupled compliant mechanisms with multiple inputs and multiple outputs

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