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Geometrical nonline...
Geometrical nonlinearities and shape effects in electromechanical models of piezoelectric bridge structures
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- Ohlsson, Fredrik, 1983 (författare)
- Gothenburg University,RISE,Chalmers University of Technology, Sweden; University of Gothenburg, Sweden; Umeå University, Sweden,Göteborgs universitet,University of Gothenburg,Umeå universitet,Umeå University,Chalmers tekniska högskola,RISE Research Institutes of Sweden,Institutionen för matematiska vetenskaper,Department of Mathematical Sciences,Institutionen för matematik och matematisk statistik,Department of Mathematical Sciences, Chalmers University of Technology and the University of Gothenburg, Gothenburg, Sweden; RISE Research Institutes of Sweden AB, Gothenburg, Sweden
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- Johannisson, Pontus (författare)
- RISE,RISE Research Institutes of Sweden,RISE Research Institutes of Sweden AB, Gothenburg, Sweden
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- Rusu, Cristina (författare)
- RISE,Smart hårdvara,RISE Research Institutes of Sweden,RISE Research Institutes of Sweden AB, Gothenburg, Sweden
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(creator_code:org_t)
- 2021-05-26
- 2021
- Engelska.
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Ingår i: International Journal of Energy and Environmental Engineering. - : Springer Science and Business Media Deutschland GmbH. - 2008-9163 .- 2251-6832. ; 12, s. 725-
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Abstract
Ämnesord
Stäng
- We consider nonlinear shape effects appearing in the lumped electromechanical model of a bimorph piezoelectric bridge structure due to the interaction between the electromechanical constitutive model and the geometry of the structure. At finite proof-mass displacement and electrode voltage, the shape of the beams is no longer given by Euler-Bernoulli theory which implies that shape effects enter in both the electrical and mechanical domains and in the coupling between them. Accounting for such effects is important for the accurate modelling of, e.g., piezoelectrical energy harvesters and actuators in the regime of large deflections and voltages. We present a general method, based on a variational approach minimizing the Gibbs enthalpy of the system, for computing corrections to the nominal shape function and the associated corrections to the lumped model. The lowest order correction is derived explicitly and is shown to produce significant improvements in model accuracy, both in terms of the Gibbs enthalpy and the shape function itself, over a large range of displacements and voltages. Furthermore, we validate the theoretical model using large deflection finite element simulations of the bridge structure and conclude that the lowest order correction substantially improve the model, obtaining a level of accuracy expected to be sufficient for most applications. Finally, we derive the equations of motion for the lowest order corrected model and show how the coupling between the electromechanical properties and the geometry of the bridge structure introduces nonlinear interaction terms. © 2021, The Author(s).
Ämnesord
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- Computation theory
- Enthalpy
- Equations of motion
- Nonlinear equations
- Piezoelectricity
- Electromechanical modeling
- Electromechanical models
- Electromechanical property
- Euler-Bernoulli theory
- Finite element simulations
- Geometrical non-linearity
- Nonlinear interactions
- Variational approaches
- Geometry
- Energy & Fuels
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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