Continuous electric field modeling of Macro-Fiber Composites for actuation and energy harvesting

Sharghi, Hesam; Bilgen, Onur

doi:10.1016/j.ijmecsci.2021.106864

Cited by 12 publications

(2 citation statements)

References 57 publications

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“…The direct and converse piezoelectric effects cause energy exchange between the morphing wings and the driving circuit. The potential distribution in the MFC device was solved by Sharghi and Bilgen [42], which is used in electromechanical model in this paper.…”

Section: Piezoelectric Circuit Domainmentioning

confidence: 99%

Multi-Physics Modeling of Induced-Strain Actuated Wings for Mechanism-Free Ornithopters

Shan,

Bilgen

2023

10th ECCOMAS Thematic Conference on Smart Structures and Materials

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Induced-strain actuators, for example piezoelectric and electro-active polymer devices, can be bonded to elastic substrates to induce flapping-like motion to form synthetic wings. Ornithopters equipped with induced-strain actuated wings do not need conventional motors and mechanisms (i.e., revolute and prismatic), potentially saving weight and energy consumption, reducing mechanical complexity, and improving wing durability. By optimizing actuator placements, excitation amplitude and phase, substrate thickness/stiffness distribution, wing mounting position, etc., a mechanism-free wing may be able to reproduce features of natural flyers. In this research, a multi-physics strongly-coupled lumped parameter model is developed to predict the dynamic response of a mechanism-free wing, which is then used in ornithopter design and controller optimization, also termed control co-design. The modeling of an induced-strain actuated ornithopter wing involves modeling of fluid-structure interaction and circuit-actuator electromechanical coupling. The structural model of the composite wing with a customizable profile is based on the Rayleigh-Ritz method. The fluid-induced effects on the wings have several contributions such as added mass and damping, and quasi-steady and unsteady aerodynamic forces. The wing, fluid-induced effects, and circuit are integrated to derive the lumped parameter governing equations using Hamilton's principle. Since the structure, fluid, and circuit domains being all represented by the lumped-parameter subsystems, the coupling between different domains is clearly defined and exposed. The reducedorder model proposed in this paper is computationally efficient, suitable for trade studies and multi-disciplinary design optimization, and can be easily converted to state representation for controller development purposes.

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Section: Piezoelectric Circuit Domainmentioning

confidence: 99%

Multi-Physics Modeling of Induced-Strain Actuated Wings for Mechanism-Free Ornithopters

Shan,

Bilgen

2023

10th ECCOMAS Thematic Conference on Smart Structures and Materials

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“…When integrated into loadbearing structures, these materials offer valuable insights into the stress state of the material or enable precise geometric control, provided they are securely bonded to the surface and do not significantly increase weight and stiffness [1]. Over the past few decades, they have found increasing relevance in various modern applications, including active vibration control, noise attenuation, aeroelastic stability, damping, morphing, and stress distribution [2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Screening significant properties of macro-fiber composite laminate substrate anisotropy with viscoelastic and thermal considerations at the quasi-static level

Tran,

Ifju

2023

Smart Mater. Struct.

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A macro-fiber composite (MFC) is a class of smart material actuator that employs piezoceramic fibers to extend or contract under an applied electric field. When embedded on a thin substrate, actuated MFCs induce surface pressure, resulting in out-of-plane motion. Design characteristics of the substrate, such as anisotropy, give rise to unique bend/twist behavior. Previous studies on MFC applications have focused on optimizing patch location in relation to the local design to achieve optimal bend/twist motion. However, the resolution to these approaches is restricted to the design space of the application, presenting an absence in piezoelectric laminate design intuition. This research aims to streamline the initial optimization process by analyzing the significant material properties associated with substrate design. To accomplish this, a viscoelastic piezoelectric plate theory model is developed to accurately capture the displacement behavior of the MFC laminate for any given substrate design. Experimental data is used to validate and refine the model, ensuring it closely represents real-world physics. A 2k fractional factorial design of experiments approach is used to identify significant substrate properties per MFC laminate configuration, assigning each material property a two-level coding system. Three configurations are observed, with each exhibiting distinct significant properties and effects compared to others. Furthermore, the study explores the impact of thermal factors on substrate behavior for these MFC laminates, highlighting how significant properties can be temperature dependent. The contributions to the kinematic response due to substrate property perturbation varies uniquely per material property and MFC laminate configuration. Statistical evidence supports the notion that the hysteretic behavior of a material is unaffected by thermal influences and is solely determined by the elastic constants of the substrate. The maximum remanent hysteretic response is shown to be proportional to the maximum actuation response at near room temperature.

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Nonlocal fields and effective properties of piezoelectric material with a rigid line inclusion perpendicular to the poling direction

Liu

Wang

2022

Arch Appl Mech

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Continuous electric field modeling of Macro-Fiber Composites for actuation and energy harvesting

Cited by 12 publications

References 57 publications

Multi-Physics Modeling of Induced-Strain Actuated Wings for Mechanism-Free Ornithopters

Multi-Physics Modeling of Induced-Strain Actuated Wings for Mechanism-Free Ornithopters

Screening significant properties of macro-fiber composite laminate substrate anisotropy with viscoelastic and thermal considerations at the quasi-static level

Nonlocal fields and effective properties of piezoelectric material with a rigid line inclusion perpendicular to the poling direction

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