Nonlinear dynamics of a conical dielectric elastomer oscillator with switchable mono to bi-stability

Dielectric elastomer actuators (DEAs) are an emerging type of soft actuator that show many advantages including large actuation strains, high energy density and high theoretical efficiency. Due to the inherent elasticity, such actuators can also be used as soft oscillators and, when at resonance, th...

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Veröffentlicht in:International journal of solids and structures Jg. 221; S. 18 - 30
Hauptverfasser: Cao, Chongjing, Hill, Thomas L., Li, Bo, Wang, Lei, Gao, Xing
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York Elsevier Ltd 15.06.2021
Elsevier BV
Schlagworte:
Active morphing structure
Actuation
Actuators
Bistability
Dielectric elastomer oscillators
Dielectrics
Dynamic response
Dynamic stability
Dynamical systems
Elastomers
Energy harvesting
Equilibrium
Flux density
Locomotion
Morphing
Nonlinear dynamics
Nonlinear response
Oscillation modes
Oscillators
Programmable controllers
Programmable oscillation
Rigid-compliant interaction
Shakers
Stability control
Nonlinear dynamics
Dielectric elastomer oscillators
Stability control
Active morphing structure
Programmable oscillation
Rigid-compliant interaction
ISSN:0020-7683, 1879-2146
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Zusammenfassung:Dielectric elastomer actuators (DEAs) are an emerging type of soft actuator that show many advantages including large actuation strains, high energy density and high theoretical efficiency. Due to the inherent elasticity, such actuators can also be used as soft oscillators and, when at resonance, the dielectric elastomer oscillators (DEOs) can exhibit a peak oscillation amplitude and power output with an improved energy efficiency in comparison to non-resonant behaviour. However, most existing DEOs have a fixed pre-defined morphology and demonstrate a single stable equilibrium, which limits their versatility. In this work, a conical DEO is proposed which may exhibit either monostability (i.e. one stable equilibrium point) or bistability (two equilibria). The system demonstrates a transition between two regimes using a voltage control. Such a feature allows the DEO system to have multiple oscillation modes with different equilibrium points and the transition between equilibria is controlled by an effective control strategy proposed in this work. A mathematical model based on the Euler-Lagrange method is developed to investigate the stability of this system and its complex nonlinear dynamic response in unforced and parametrically forced cases. This design has potential in more advanced and versatile DEO applications such as active vibrational controllers/ shakers, active morphing structures, smart energy harvesting and highly programmable robotic locomotion.
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content type line 14
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2020.02.012