Micro-Control Actions of Segmented Actuator Patches Laminated on Deep Paraboloidal Shells.

Tzou, H. S.; Ding, J. H.; Hagiwara, Ichiro

doi:10.1299/jsmec.45.8

Cited by 28 publications

(5 citation statements)

References 16 publications

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“…Although the parabolic cylindrical shell panels generally vibrate in three directions, that is, u i ( i = x , ψ , 3 ) , the transverse vibration u 3 ( x , ψ , t ) usually is the dominant dynamic response of the shell structure, and the longitudinal and meridional vibrations are often small and negligible (Tzou, 2018; Tzou et al, 2002). Thus, in the following analysis, only the transverse vibration is considered.…”

Section: Parabolic Cylindrical Shell Model and Dynamic Equationsmentioning

confidence: 99%

Flexoelectric vibration control of parabolic shells

Zhang

Fan

Tzou

2022

Journal of Intelligent Material Systems and Structures

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The presented work focuses on the spatially distributed actuation behavior of flexoelectric actuators on a parabolic cylindrical shell panel with simply supported boundary conditions. A flexoelectric actuator with significant electric field gradients could generate actuation forces and control moments to drive or control system oscillations. For an engineering structure with initial excitations, flexoelectric actuators could be employed to achieve vibration control with designed electric inputs. The dynamic equations of the parabolic cylindrical panel laminated with an arbitrary flexoelectric actuator are defined first. The transverse displacement excited by an external mechanical loading and flexoelectric actuators is calculated. Actuation effects and vibration control efficiency contributed by various design parameters including flexoelectric patch thickness and atomic force microscopy (AFM) probe radius are studied. As the purpose of this study is to accelerate the vibration attenuation, the open-loop control usually causes insufficient control or over-actuation effects. Using displacement feedback, velocity feedback, and acceleration feedback, the effectiveness of these three closed-loop control methods is analyzed and evaluated by the modal response. Analyses suggest that the velocity feedback could effectively attenuate oscillations with the lowest voltage input than in the other two cases. Specifically, the system damping ratio can be adjusted with velocity feedback. Lower voltage input could benefit system design and release stress concentrations caused by high electric field gradients. This research provides a basis for vibration control based on flexoelectric parabolic shell structures and provides an optimal choice for the design of flexoelectric drive closed-loop control for parabolic shell structures.

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Section: Parabolic Cylindrical Shell Model and Dynamic Equationsmentioning

confidence: 99%

Flexoelectric vibration control of parabolic shells

Zhang

Fan

Tzou

2022

Journal of Intelligent Material Systems and Structures

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“…xsin(β * )dψdx. (10) The electric control forces and moments induced by the actuator per unit length with control voltage φ a are defined as [13] N…”

Section: Formulations Of the Modal Control Forcementioning

confidence: 99%

Distributed actuation characteristics of clamped-free conical shells using diagonal piezoelectric actuators

Li¹,

Chen²,

Tzou³

2010

Smart Mater. Struct.

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In spacecraft, severe vibrations induced by the launch vehicle may cause damage to the precision payload. Therefore active adapters with vibration suspending characteristics are needed. This paper presents theoretical studies of the active vibration control characteristics of conical shells with laminated piezoelectric actuators. A diagonal piezoelectric actuator is proposed to control the axial, lateral and transverse vibrations of the conical shell. Modal functions are designed to represent the free vibrations of the conical shell with clamped-free boundary conditions. General formulae of the modal control force and corresponding components are derived based on the converse piezoelectric effects and then specified for the diagonal actuators. By using an open-loop control method, the modal control characteristics of diagonal actuator segments at different locations are investigated and compared, and the axial, lateral and transverse vibrations of two conical shell models are evaluated. The optimal locations of actuator segments for the control of different natural modes are also investigated.

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“…Examples include aerospace/aircraft structures [27,28], robot manipulators [29], vibration controls and isolations, high-precision devices, microsensors/actuators, thin-film MEMS [30], health monitoring [31], microdisplacement actuation and control [25], and so on. Additional applications in smart structures and structronic systems encompass distributed structural control [16,[32][33][34][35][36], rotor dynamics control [37], self-sensing actuators [38][39][40], orthogonal modal sensors/actuators [41][42][43], space truss members [44], noise control [45], vibration isolators [46], active constrained damping [47], morphing of wings and blades [48], microscopic neural-sensing and actuation characteristics of conical, paraboloidal, toroidal and spherical structronic shells [49][50][51][52][53][54][55], and so on. Other recent practical applications include piezoelectrically damped skis, control of aeroelastic wing flutter, optical metering truss control, helicopter blade control, noise reduction, biomedical applications, and ultrasonic motors [56][57][58][59][60][61].…”

Section: Piezoelectric Materialsmentioning

confidence: 99%

Smart Materials, Precision Sensors/Actuators, Smart Structures, and Structronic Systems

Tzou

Lee

Arnold

2004

Mechanics of Advanced Materials and Structures

177

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Many electroactive functional materials have been used in small-and microscale transducers and precision mechatronic control systems for years. It was not until the mid-1980s that scientists started integrating electroactive materials with large-scale structures as in situ sensors and/or actuators, thus introducing the concept of smart materials, smart structures, and structronic systems. This paper provides an overview of present smart materials and their sensor/actuator/structure applications. Fundamental multifield optomagnetopiezoelectric-thermoelastic behaviors and novel transducer technologies applied to complex multifield problems involving elastic, electric, temperature, magnetic, light, and other interactions are emphasized. Material histories, characteristics, material varieties, limitations, sensor/actuator/structure applications, and so forth of piezoelectrics, shape-memory materials, electro-and magnetostrictive materials, electro-and magnetorheological fluids, polyelectrolyte gels, superconductors, pyroelectrics, photostrictive materials, photoferroelectrics, magneto-optical materials, and so forth are thoroughly reviewed. INTRODUCTIONThe concepts of smart, intelligent, and adaptive materials and structures originated in the mid-1980s in an attempt to describe the newly emerging research area of integrating electroactive functional materials into large-scale structures as in situ sensors and actuators. Previously, electroactive materials had only been used in small-and microscale transducers and precision mechatronic (mechanical + electronic) control systems. The general perception of smart, intelligent, and adaptive materials or structures implies an ability to be clever, sharp, active, fashionable, and sophisticated. However, in reality, materials or structures can never achieve true intelligence or reasoning without the addition of artificial intelligence

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Micro-Control Actions of Segmented Actuator Patches Laminated on Deep Paraboloidal Shells.

Cited by 28 publications

References 16 publications

Flexoelectric vibration control of parabolic shells

Flexoelectric vibration control of parabolic shells

Distributed actuation characteristics of clamped-free conical shells using diagonal piezoelectric actuators

Smart Materials, Precision Sensors/Actuators, Smart Structures, and Structronic Systems

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