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检索条件"任意字段=Conference on Active and Passive Smart Structures and Integrated Systems"

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Nonlinear Modeling of piezoelectric layered beams

Nonlinear Modeling of piezoelectric layered beams

引用

conference on active and passive smart structures and integrated systems

作者： Saghafi, Mehdi Jalili, Nader Meghdari, Ali Sharif Univ Technol Sch Mech Engn Ctr Excellence Design Robot & Automat Tehran Iran Clemson Univ Dept Mech Engn Smart Struct & Nanoelectromech Syst Clemson SC 29634 USA

ISBN: (纸本)9780819466464

The dynamic equations of piezoelectric benders are studied in this paper, considering nonlinear behavior of piezoceramics. A second order approximation of constitutive equations of piezoceramics is used to account for reversible nonlinearities. Transversal and longitudinal deflections at the tip of the beam and the blocking force as well as sensor equations (output charge as a function of external loads) are obtained under static conditions. The static equations are then used to construct a linear dynamic model for actuation. A Bouc-Wen type hysteresis model is employed in order to account for the irreversible nonlinearities. The final equation of motion is in the form of well-known Hill's equation.

关键词： piezoelectric beam Nonlinear piezoelectric model hysteresis Hill's equation

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Control of structures Featuring a New MRE Isolator System

Control of Structures Featuring a New MRE Isolator System

引用

conference on active and passive smart structures and integrated systems

作者： Behrooz, Majid Wang, Xiaojie Gordaninejad, Faramarz Univ Nevada Dept Mech Engn Composite & Intelligent Mat Lab Reno NV 89557 USA

ISBN: (纸本)9780819489982

This study is focused on control of a scaled building structure using a new semi-active Variable Stiffness and Damping Isolator (VSDI). The proposed VSDI system consists of a traditional steel-rubber vibration absorber, and a magnetorhelogical elastomer (MRE) with a controllable stiffness and damping behavior. To demonstrate the feasibility of using VSDIs a 1:16 scaled, three-story building is constructed and installed on a shake table and its base is supported by four prototype VSDIs. The VSDIs can be regulated in real time by varying the applied magnetic field through a controller. A phenomenological model is proposed and implemented on VSDI devices. The scaled El Centro earthquake excitation is applied to the system, and the vibration mode is controlled by a Lyapunov-based control strategy. Results show that the a significant reduction in structural response can be achieved for both displacement and acceleration.

关键词： Magnetorheological Elastomers Vibration Isolation Variable Stiffness Semi-active Control

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Modeling Electroelastic Nonlinearities in Ultrasound Acoustic Energy Transfer systems 12

Modeling Electroelastic Nonlinearities in Ultrasound Acousti...

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conference on active and passive smart structures and integrated systems XII

作者： Meesala, Vamsi C. Hajj, Muhammad R. Shahab, Shima Virginia Tech Dept Biomed Engn & Mech Blacksburg VA 24061 USA

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Ultrasound acoustic energy transfer systems are receiving growing attention in the area of contactless energy transfer for its advantages over other approaches, such as inductive coupling method. To date, most research on this approach has been on modeling and proof-of-concept experiments in the linear regime where nonlinear effects associated with high excitation levels are not significant. We present an acoustic-electroelastic model of a piezoelectric receiver in water by considering its nonlinear constitutive relations. The theory is based on ideal spherical sound wave propagation in conjunction with the electroelastic distributed-parameter governing equations for the receiver's vibration and the electrical circuit.

关键词： Ultrasound acoustic energy transfer Contactless energy transfer smart materials Method of Multiple Scales Nonlinear strains Softening nonlinearity Optimum Resistance

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Vibration suppression of hull structure using macro fiber composite actuators and sensors

Vibration suppression of hull structure using macro fiber co...

引用

conference on active and passive smart structures and integrated systems

作者： Sohn, Jung Woo Kim, Heung Soo Kim, Chan-Jung Ha, Sung Hoon Choi, Seung-Bok Inha Univ Dept Mech Engn Smart Struct & Syst Lab 253 Yonghyun Dong Inchon 402751 South Korea

ISBN: (纸本)9780819466464

Dynamic modeling of smart hull structure with advanced piezoelectric actuator;macro-fiber composite (MFC) actuator, is developed and control performance to suppress structural vibration of the system is studied. Finite element technique is used to ensure application to practical geometry and boundary conditions of smart hull structure. Modal analysis is conducted to investigate the dynamic characteristics of smart hull structure. For the verification of the proposed finite element model, numerical results of modal analysis are compared with those of experimental modal test results. Modal mass and stiffness matrix of smart hull structure are extracted for the controller design. active controller is designed to suppress structural vibration of smart hull structure and control performance is evaluated in the resonance and nonresonance regions.

关键词： smart hull structure macro fiber composite modal analysis dynamic characteristics vibration control

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Optimization and implementation of the smart joint actuator

Optimization and implementation of the smart joint actuator

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conference on active and passive smart structures and integrated systems

作者： Manzo, Justin Garcia, Ephrahim Cornell Univ Lab Intelligent Machine Syst Ithaca NY 14853 USA

ISBN: (纸本)9780819471147

A new actuator system is being developed at the Cornell Laboratory of Intelligent Material systems to address the problems of dynamic self-actuated shape change. This low profile actuator, known as the 'smart joint', is capable of maintaining rigidity in its nominal configuration, but can be actively strained to induce rotation at flexure joints. The joint is energetically efficient, only requiring power consumption during active morphing maneuvers used to move between shapes. The composite beam mechanism uses shape memory alloy (SMA) for strain actuation, with shape memory polymer (SMP) providing actively tailored rigidity due to its thermally varying properties. The first phase of the actuator development was modeling of the generic composite structure, proving analytically and computationally that the joint can produce useful work. The next phase focuses on optimization of this joint structure and usage, including ideal layering configurations and thicknesses in order to maximize various metrics specific to particular applications. Heuristic optimization using the simulated annealing algorithm is employed to best determine the structure of the joint at various scaling ratios, layering structures, and with varying external loading taken into account. The results are briefly compared to finite element models.

关键词： smart joint simulated annealing morphing composite beam shape memory alloy shape memory polymer smart materials

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Modeling and design of Galfenol unimorph energy harvester

Modeling and design of Galfenol unimorph energy harvester

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conference on active and passive smart structures and integrated systems

作者： Deng, Zhangxian Dapino, Marcelo J. Ohio State Univ Dept Mech & Aerosp Engn Smart Vehicle Concepts Ctr Columbus OH 43210 USA

ISBN: (纸本)9780819499837

Magnetostrictive iron-gallium alloys, known as Galfenol, are a recent class of smart materials with potential in energy harvesting applications. Unimorph energy harvesters consisting of a Galfenol beam bonded to a passive substrate are simple and effective, but advanced models are lacking for these smart devices. This study presents a finite element model for Galfenol unimorph harvester systems. Experiments considering various design parameters such as pick up coil size, load resistance, beam thickness ratio, and bias magnetic field strength are conducted to guide and validate the modeling effort. If the free length of the Galfenol unimorph beam is considered as the effective length, the maximum average power density, peak power density, and open-circuit voltage amplitude achieved in experiments are 13.97 mW/cm(3), 35.51 mW/cm(3), and 0.66 V, respectively. By only considering the length of Galfenol surrounded by the pickup coil, the maximum average power density and peak power density are 23.66 mW/cm(3) and 60.14 mW/cm(3), respectively.

关键词： Galfenol Energy Harvester Unimorph COMSOL Multiphysics

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Experimental characterization of a bi-dimensional array of negative capacitance piezo-patches for vibroacoustic control

Experimental characterization of a bi-dimensional array of n...

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conference on active and passive smart structures and integrated systems

作者： Tateo, F. Collet, M. Ouisse, M. Ichchou, M. N. Cunefare, K. A. Femto St Besancon France

ISBN: (纸本)9780819494719

A recent technological revolution in the fields of integrated MEMS has finally rendered possible the mechanical integration of active smart materials, electronics and power supply systems for the next generation of smart composite structures. Using a bi-dimensional array of electromechanical transducers, composed by piezo-patches connected to a synthetic negative capacitance, it is possible to modify the dynamics of the underlying structure. In this study, we present an application of the Floquet-Bloch theorem for vibroacoustic power flow optimization, by means of distributed shunted piezoelectric material. In the context of periodically distributed damped 2D mechanical systems, this numerical approach allows one to compute the multi-modal waves dispersion curves into the entire first Brillouin zone. This approach also permits optimization of the piezoelectric shunting electrical impedance, which controls energy diffusion into the proposed semi-active distributed set of cells. Furthermore, we present experimental evidence that proves the effectiveness of the proposed control method. The experiment requires a rectangular metallic plate equipped with seventy-five piezo-patches, controlled independently by electronic circuits. More specifically, the out-of-plane displacements and the averaged kinetic energy of the controlled plate are compared in two different cases (open-circuit and controlled circuit). The resulting data clearly show how this proposed technique is able to damp and selectively reflect the incident waves.

关键词： negative capacitance smart materials metacomposite Bloch theorem experiment.

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Static and quasi-static Behavior of an Adaptive System to compensate Path Errors for smart Fiber Placement

Static and quasi-static Behavior of an Adaptive System to co...

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conference on active and passive smart structures and integrated systems

作者： Perner, M. Monner, H. P. Krombholz, C. Kruse, F. F. German Aerosp Ctr DLR Inst Composite Struct & Adapt Syst D-38108 Braunschweig Germany German Aerosp Ctr DLR Inst Composite Struct & Adapt Syst D-21684 Stade Germany

ISBN: (纸本)9781628415346

smart fiber placement is an ambitious topic in current research for automated manufacturing of large-scale composite structures, e.g. wing covers. Adaptive systems get in focus to obtain a high degree of observability and controllability of the manufacturing process. In particular, vibrational issues and material failure have to be studied to significantly increase the production rate with no loss in accuracy of the fiber layup. As one contribution, an adaptive system has been developed to be integrated into the fiber placement head. It decouples the compaction roller from disturbances caused by misalignments, varying components' behavior over a large work area and acceleration changes during operation. Therefore, the smart system axially adapts the position of the compaction roller in case of disturbances. This paper investigates the behavior of the system to compensate quasi-static deviations from the desired path. In particular, the compensation efficiency of a constant offset, a linear drift with constant gradient and a single-curved drift is studied. Thus, the test bed with measurement devices and scenarios is explained. Based on the knowledge obtained by the experimental data, the paper concludes with a discussion of the proposed approach for its use under operating conditions and further implementation.

关键词： Fiber placement active vibration reduction path errors adaptive system smart structures technology

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active-passive hybrid piezoelectric actuators for high precision hard disk drive servo systems

Active-passive hybrid piezoelectric actuators for high preci...

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smart structures and Materials 2006 conference

作者： Chan, Kwong Wah Liao, Wei-Hsin Chinese Univ Hong Kong Dept Automat & Comp Aided Engn Smart Mat & Struct Lab Shatin Hong Kong Peoples R China

ISBN: (纸本)0819462268

Positioning precision is crucial to today's increasingly high-speed, high-capacity, high data density, and miniaturized hard disk drives (HDDs). The demand for higher bandwidth servo systems that can quickly and precisely position the read/write head on a high track density becomes more pressing. Recently, the idea of applying dual-stage actuators to track servo systems has been studied. The push-pull piezoelectric actuated devices have been developed as micro actuators for fine and fast positioning, while the voice coil motor functions as a large but coarse seeking. However, the current dual-stage actuator design uses piezoelectric patches only without passive damping. In this paper, we propose a dual-stage servo system using enhanced active-passive hybrid piezoelectric actuators. The proposed actuators will improve the existing dual-stage actuators for higher precision and shock resistance, due to the incorporation of passive damping in the design. We aim to develop this hybrid servo system not only to increase speed of track seeking but also to improve precision of track following servos in HDDs. New piezoelectrically actuated suspensions with passive damping have been designed and fabricated. In order to evaluate positioning and track following performances for the dual-stage track servo systems, experimental efforts are carried out to implement the synthesized active-passive suspension structure with enhanced piezoelectric actuators using a composite nonlinear feedback controller.

关键词： hard disk drive dual-stage servo system piezoelectric actuator active-passive hybrid precision positioning

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Nonlinear semi-passive vibration control based on synchronized switch damping with energy transfer between two modes

Nonlinear semi-passive vibration control based on synchroniz...

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conference on active and passive smart structures and integrated systems

作者： Li, Kaixiang Gauthier, Jean-Yves Guyomar, Daniel Univ Lyon INSA Lyon LGEF EA 682 F-69621 Villeurbanne France

ISBN: (纸本)9780819485397

Vibration control based on mechanical energy transfer was recently proposed in a technique called synchronized switch damping with energy transfer (SSDET). In this technique, the mechanical energy, which is extracted from a energy source structure is transfered in order to damp another structure. This paper introduces this technique on a multimode vibrating structure. The energy transfer path is from one mode to another. A threshold is set in the control system for the sake of better damping. Experiments are carried out on an one edge clamped plate and both the harmonic response and the impulse response are considered. Results validate the effectiveness of this technique for multimode vibration control.

关键词： synchronized switch damping vibration control energy transfer multimode

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