State-of-the-Art Developments in the Field of Electroactive Polymers

Виноградов, А. М.; Su, Jing; Bar‐Cohen, Yoseph

doi:10.1557/proc-0889-w02-05

Cited by 14 publications

(13 citation statements)

References 12 publications

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“…A number of reviews have been conducted on electroactive polymers generally [21,22], and for specific applications including naval [23], space [24], and medical and biomimetic technologies [25,26]. Ionic EAPs, including electrochemo-mechanical conducting polymers, ionic polymer metal composites, and mechano-chemical polymers/gels, are largely limited by low strain rates and, with the exception of the latter, actuation strains and speed owing to predominantly diffusion-dependent reactions [25].…”

Section: Actuator Technologymentioning

confidence: 99%

Dielectric elastomers as actuators for upper limb prosthetics: Challenges and opportunities

Biddiss

Chau

2008

Medical Engineering & Physics

133

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Section: Actuator Technologymentioning

confidence: 99%

Dielectric elastomers as actuators for upper limb prosthetics: Challenges and opportunities

Biddiss

Chau

2008

Medical Engineering & Physics

133

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“…This gives us an interconnection of the ith system with the neighboring systems, as illustrated in Figure 4 The following simulation in Matlab shows the behavior of a simple piezoelectric beam. We consider Kapton [8] as material for the base layer, and polyvinylidene flouride (PVDF) [15] as piezoelectric material. The base layer has a length of 1 m, while the thickness and the width of the beam are 2 cm.…”

Section: Interconnection Of the Subsystems And Simulation Resultsmentioning

confidence: 99%

Structure Preserving Spatial Discretization of a 1-D Piezoelectric Timoshenko Beam

Voß¹,

Scherpen²

2011

Multiscale Model. Simul.

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In this paper we show how to spatially discretize a distributed model of a piezoelectric beam representing the dynamics of an inflatable space reflector in port-Hamiltonian (pH) form. This model can then be used to design a controller for the shape of the inflatable structure. Inflatable structures have very nice properties, suitable for aerospace applications, e.g., inflatable space reflectors. With this technology we can build inflatable reflectors which are about 100 times bigger than solid ones. But to be useful for telescopes we have to achieve the desired surface accuracy by actively controlling the surface of the inflatable. The starting point of the control design is modeling for control. In this paper we choose lumped pH modeling since these models offer a clear structure for control design. To be able to design a finite dimensional controller for the infinite dimensional system we need a finite dimensional approximation of the infinite dimensional system which inherits all the structural properties of the infinite dimensional system, e.g., passivity. To achieve this goal first divide the one-dimensional (1-D) Timoshenko beam with piezoelectric actuation into several finite elements. Next we discretize the dynamics of the beam on the finite element in a structure preserving way. These finite elements are then interconnected in a physical motivated way. The interconnected system is then a finite dimensional approximation of the beam dynamics in the pH framework. Hence, it has inherited all the physical properties of the infinite dimensional system. To show the validity of the finite dimensional system we will present simulation results. In future work we will also focus on two-dimensional (2-D) models.

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“…Therefore, actively influencing the shape of the inflatable structure is necessary. As a possibility for changing the shape one could use smart materials which have the possibility to change their properties on demand (up to a certain range which is limited by the type of material), e.g., piezoelectric polymers [24]. Piezoelectric polymers are able to change shape by means of an applied voltage.…”

Section: Introductionmentioning

confidence: 99%

Port-Hamiltonian Modeling of a Nonlinear Timoshenko Beam with Piezo Actuation

Voß¹,

Scherpen

2014

SIAM J. Control Optim.

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In this paper we develop a mathematical model for the dynamics of a nonlinear Timoshenko beam with piezoelectric actuation. This model can then be used to design controllers with the goal of achieving a desired shape of the beam. The control scheme can be used for several applications, e.g., vibration control in structures or shape control for high-precision structures like inflatable space reflectors. The starting point of the control design is modeling for control. We do this in the framework of port-Hamiltonian (pH) modeling, which has favorable properties, such as passivity and a Hamiltonian representing the energy and serving as a Lyapunov function, that can be exploited for controller design. An important property of the pH modeling framework is that it facilitates modeling multiphysics systems or systems which consist of several subsystems, where all parts are modeled separately and then can be interconnected easily. This is possible because any interconnection of finite dimensional pH systems yields again a finite dimensional pH system. Hence, the pH framework is useful for our multidomain modeling purpose.

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State-of-the-Art Developments in the Field of Electroactive Polymers

Cited by 14 publications

References 12 publications

Dielectric elastomers as actuators for upper limb prosthetics: Challenges and opportunities

Dielectric elastomers as actuators for upper limb prosthetics: Challenges and opportunities

Structure Preserving Spatial Discretization of a 1-D Piezoelectric Timoshenko Beam

Port-Hamiltonian Modeling of a Nonlinear Timoshenko Beam with Piezo Actuation

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