Synthesis of compliant mechanisms with selective compliance – An advanced procedure

Kirmse, Stephanie; Campanile, Lucio Flavio; Hasse, Alexander

doi:10.1016/j.mechmachtheory.2020.104184

Cited by 16 publications

(25 citation statements)

References 16 publications

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“…It operates on the system's eigenproperties, which -under certain conditions -describes preferred deformations independently on the acting loads. In this sense, and owing to its generality and applicability to systems with a large number of input and output DoF (collectively called "active DoF" -see below) [2][3][4], the modal approach represents a paradigm change in the area of compliant mechanism synthesis. It has the potential of covering a large part of the gaps left by the present state of the art.…”

Section: Overview Of the State Of The Artmentioning

confidence: 99%

“…It has the potential of covering a large part of the gaps left by the present state of the art. Up to now, the modal approach was applied to design problems with single pseudo-mobility [2][3][4]. In this paper, the extension to multiple pseudo-mobility is described and documented.…”

Section: Overview Of the State Of The Artmentioning

confidence: 99%

“…can be called primary stiffnesses of the compliant mechanism [4]. The secondary stiffness is calculated as:…”

Section: Design Problemmentioning

confidence: 99%

“…As mentioned earlier, the optimization procedure described here is an adaptation of the procedure presented in [4] to the more general case of compliant mechanisms with multiple pseudo-mobility. Therefore, the basic flow of the optimization and many of the formulas presented in [4] retain their validity.…”

Section: Overviewmentioning

confidence: 99%

“…In this paper, the modal procedure for the topology-optimization based synthesis of compliant mechanisms [2][3][4] is extended to the case of m > 1 (multiple pseudo-mobility). Like the original procedure, the presented procedure is valid for the geometrically linear case.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Overview Of the State Of The Artmentioning

confidence: 99%

Section: Overview Of the State Of The Artmentioning

confidence: 99%

“…can be called primary stiffnesses of the compliant mechanism [4]. The secondary stiffness is calculated as:…”

Section: Design Problemmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Kirmse¹,

Campanile²,

Hasse³

2021

Preprint

Self Cite

View full text Add to dashboard Cite

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Topology and orientation optimization of multi-material hinge-free composite compliant mechanisms under multiple design-dependent loadings

Lu,

Tong

2024

Struct Multidisc Optim

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Compliant mechanisms with multiple input loads and output ports are commonly applied in micro-electromechanical systems (MEMS), while compliant mechanisms under design-dependent pressure loadings (such as pneumatic or hydraulic) can generate smooth and compatible deformations. Combining these two types of problems, we propose the design problem of compliant mechanisms under multiple design-dependent loadings. To potentially improve the structural performances, fiber-reinforced composite materials are introduced, and multi-material topology optimization and material orientation optimization are considered simultaneously, which enables the materials to be anisotropic and heterogeneous. Since compliant mechanisms utilize elastic deformation to transmit input forces or displacements to output forces or displacements, anisotropic and heterogeneous material can increase the freedoms in displacement and force transmissions compared to conventional homogeneous isotropic material. The topology optimization is implemented via an extended moving iso-surface threshold (MIST) method for multi-material, in which a novel element-based searching scheme is employed for tracking multiple fluid–structure interfaces. The orientation optimization is achieved via an analytical solution derived for fully anisotropic materials and multi-input-multi-output compliant mechanisms. Numerical examples are presented to show the validity of the present MIST method to design multi-material hinge-free compliant mechanisms under multiple design-dependent loadings.

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Design optimization of a flexure spring used in small-sized ultra-precise optical instrument

Kim,

Lee,

Kim

2023

Heliyon

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Synthesis of compliant mechanisms with selective compliance – An advanced procedure

Cited by 16 publications

References 16 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 and orientation optimization of multi-material hinge-free composite compliant mechanisms under multiple design-dependent loadings

Design optimization of a flexure spring used in small-sized ultra-precise optical instrument

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