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检索条件"任意字段=Smart Structures and Materials 1994: Mathematics and Control in Smart Structures"

共 544 条记录，以下是391-400 订阅

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A micromechanics model for coated-fiber piezoelectric composites

A micromechanics model for coated-fiber piezoelectric compos...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Benveniste, Yakov Department of Solid Mechanics Materials and Structures Faculty of Engineering Tel-Aviv University Ramat-Aviv69978 Israel

A piezocomposite with coated cylindrical fibers of a circular cross section are considered. The fibers are parallel to each other and randomly located in the transverse plane. The Composite Cylinder Assemblage model is adopted and simple formulae are derived for all the effective constants, except for the transverse shear modulus. This last parameter is estimated by a mean field theory approximation. © 1994 SPIE.

关键词： Mean field theory

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HYBRID COMPOSITE-materials USING SHAPE-MEMORY ALLOY ACTUATORS TO PROVIDE VIBRATION AND ACOUSTIC control

HYBRID COMPOSITE-MATERIALS USING SHAPE-MEMORY ALLOY ACTUATOR...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： SCHETKY, LM LIANG, C ROGERS, CA MEMRY CORP BROOKFIELDCT 06804

ISBN: (纸本)0819414859

Shape memory alloys exhibit several characteristics which make these materials particularly attractive for modal modification of structures: a large change in modulus upon heating through the phase transformation temperature, an exceptionally high specific damping capacity, and an ability to generate large forces through the shape recovery mechanism. Used as either embedded members in a composite structure, or as an external actuator when caused to undergo the shape transformation by heating, these actuators can provide a significant change in acoustic response of the structure. The paper describes shape memory alloy characterization and the design of an actuator system for modifying the acoustic response of a clamped plate.

关键词： Shape memory alloys Actuators Composites Acoustics Aluminum Laser Doppler velocimetry Matrices Vibration control Bridges Chlorine

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SELF-SENSING control AS APPLIED TO A PZT STACK ACTUATOR USED AS A MICROPOSITIONER

SELF-SENSING CONTROL AS APPLIED TO A PZT STACK ACTUATOR USED...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： JONES, L GARCIA, E WAITES, H VANDERBILT UNIV DEPT MECH ENGNNASHVILLETN 37235

ISBN: (纸本)0819414859

Recently, more attention has been focused on improving open-loop performance characteristics of smart actuator materials. The impetus in pursuing this course of research is reducing the need for oftentimes costly and obtrusive independent sensors used for feedback to the actuator. Self-sensing actuation is a control technique that can be applied to many smart materials including piezoceramics. It involves extracting a sensing signal from the actuating material by use of a bridge circuit, then properly feeding this signal back to improve the actuator's performance. The research presented in this paper is concerned with the feasibility of applying this technique to a soft PZT stacked actuator used as a micropositioner. The result of applying this control technique was a reduction of the micropositioner's decay time from over 1 ms to under 0.3 ms. A major contributor to the success of this research was the insertion of a nonlinear capacitive element in the self-sensing bridge which negated the nonlinear effects of the PZT stack thus enabling an increase in the self-sensing signal to noise ratio.

关键词： Actuators Micropositioners Ferroelectric materials Bridges Capacitance Sensors Nonlinear optics control systems Wheatstone bridges smart materials

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CONCURRENT OPTIMIZATION TECHNIQUE FOR A STRUCTURE AND ITS controlLER

CONCURRENT OPTIMIZATION TECHNIQUE FOR A STRUCTURE AND ITS CO...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： MCCULLOCH, AM CLENDENIN, BC JOHANSON, R UNIV MICHIGAN DEPT AEROSP ENGNANN ARBORMI 48109

ISBN: (纸本)0819414859

A design technique is presented to improve the overall performance of a structural system by simultaneously optimizing the design of the structure and an associated controller. This procedure requires the minimization of a single objective function, subject to dimensional or mass constraints. This is done by including the control and disturbance forces in the equations of motion for the structure and using the eigenfunctions of a uniform structural design as a basis for the eigenfunctions of the optimally designed, nonuniform structure. The results of the concurrent optimization of an Euler-Bernoulli beam and H₂ controller are presented. More complicated structures/controllers can be designed using this technique, provided the structure can be modeled as a linear time-invariant plant and the controller synthesis technique involves a single cost functional.

关键词： Structural design control systems design Actuators Sensors Systems modeling control systems Beam shaping Matrices Process control Statistical modeling

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Distributed parameter system models for damage detection and location in smart material structures

Distributed parameter system models for damage detection and...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Banks, H.T. Wang, Yun Center for Research in Scientific Computation North Carolina State University RaleighNC27695-8205 United States

Nondestructive damage detection is an important issue in aging civil engineering, aerospace structures, and several other areas. This study presents an attempt to use parameterized partial differential equations and Galerkin approximation techniques to detect and locate damage. Dynamical analysis is carried out using structure bonded piezoceramic patches as both sensors and actuators. Our presentation will demonstrate the flexibility and accuracy of this approach. It is mode independent and can sense the presence of damage and locate certain damages to a satisfactory precision. As an example, a beam with a pair of piezoceramic patches bonded to it is used as the test structure;several computational examples with holes of different size, shape, and location in the beam are investigated. © 1994 SPIE.

关键词： Damage detection

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ACTIVE ISOLATION DEVICES

ACTIVE ISOLATION DEVICES

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： POKINES, BJ HOLCOMB, MD INMAN, DJ BELVIN, WK VIRGINIA POLYTECH INST & STATE UNIV BLACKSBURGVA 24061

ISBN: (纸本)0819414859

This paper examines the design of a linear motor combining piezoceramic actuation with viscoelastic damping. The actuator consists of aluminum discs alternately treated with piezoceramics and viscoelastic material. The discs are joined together by a rod through their center and cantilevered inside a cylinder to form a linear motor. This configuration offers increased design flexibility. The issues of a combined passive/active actuator design are discussed in terms of vibration isolation.

关键词： Optical isolators Actuators Passive elements Aluminum Satellites Active isolation Signal attenuation Systems modeling control systems Vibration isolation

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OPTIMIZATION OF ADAPTIVE INTRAPLY HYBRID FIBER COMPOSITES WITH RELIABILITY CONSIDERATIONS

OPTIMIZATION OF ADAPTIVE INTRAPLY HYBRID FIBER COMPOSITES WI...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： SHIAO, MC CHAMIS, CC NYMA INC BROOKPARKOH 44142

ISBN: (纸本)0819414859

The reliability with bounded distribution parameters (mean, standard deviation, etc.) is maximized and the reliability-based cost is minimized for adaptive intraply hybrid fiber composites using a probabilistic method. The probabilistic method accounts for all naturally occurring uncertainties including those in constituent material properties, fabrication variables, structure geometry and control related parameters. Probabilistic sensitivity factors are computed and used in optimization procedures. The reliability for actuated change in the angle of attack of an airfoil-type composite shell structure with an adaptive torque plate is maximized to 0.9999 probability with constraints on mean and standard deviation of control volume ratio (percentage of actuation composite material in a ply) and control strain coefficient. The reliability-based cost for an airfoil-type composite shell structure with adaptive skin is minimized with mean control volume ratio as the design parameter. It is found that at 0.91 mean control volume ratio, the balance between maximum reliability and minimum cost is achieved.

关键词： Composites Reliability Skin Failure analysis Computer programming control systems Manufacturing Monte Carlo methods Ceramics smart structures

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JITTER SUPPRESSION EXPERIMENT ACTIVE DAMPING SYSTEM-DESIGN CONSIDERATIONS

JITTER SUPPRESSION EXPERIMENT ACTIVE DAMPING SYSTEM-DESIGN C...

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smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： FRANK, GJ OLSON, SE DRAKE, ML UNIV DAYTON RES INSTDAYTONOH 45469

ISBN: (纸本)0819414859

The University of Dayton Research Institute (UDRI) is teamed with McDonnell Douglas Aerospace (MDA) to develop and fly a NASA IN- STEP experiment entitled Jitter Suppression Experiment (JSX). The JSX will demonstrate a combined active/passive vibration control system on an actual full-scale space structure. This paper presents various mechanical considerations in the design of the active control system. This includes evaluating different sensor and actuator types and evaluating applicable control theories and control implementations.

关键词： Actuators control systems Sensors control systems design Ceramics Epoxies Aerospace engineering Shape memory alloys Telecommunications Vibration control

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control OF SHAPES OF ELASTIC PLATES USING EMBEDDED PIEZOELECTRIC ACTUATORS

CONTROL OF SHAPES OF ELASTIC PLATES USING EMBEDDED PIEZOELEC...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： AGRAWAL, SK TONG, DQ NAGARAJA, K OHIO UNIV DEPT MECH ENGNATHENSOH 45701

ISBN: (纸本)0819414859

Future technologies in microsensing, microactuation, active changes in shapes of aerofoils and turbine blades justify and necessitate a comprehensive study of piezoactuators for shape control of structures. Piezo materials have the property to develop strain on applying voltage and voltage on applying strain, hence, these materials are useful both as sensors and actuators. If a piezoactuator is bonded to a substrate plate, on applying voltages, the resulting strain in the actuator induces a deflection in the plate. This deflection is a function of geometry, material properties of actuator and substrate, layout of piezoactuators, and voltage inputs to the actuators. The objectives of this paper are: (a) to develop a mathematical model for deflection of a thin plate embedded with piezo actuators using elastic plate theory, (b) to compute plate deflection by solving the mathematical model using finite difference technique, and (c) to estimate optimal actuation voltages to match the deflection of the plate to a desired deflection.

关键词： Actuators Aluminum Mathematical modeling Matrices Aerospace engineering control systems Differential equations Finite difference methods Sensors Software

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TRANSIENT-RESPONSE OF AN ADAPTIVE BEAM WITH EMBEDDED PIEZOELECTRIC MICROACTUATORS

TRANSIENT-RESPONSE OF AN ADAPTIVE BEAM WITH EMBEDDED PIEZOEL...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： DASGUPTA, A ALGHAMDI, AA UNIV MARYLAND DEPT MECH ENGNCOLLEGE PKMD 20742

ISBN: (纸本)0819414859

The transient response and the damping of a cantilevered adaptive beam is explored in this paper. The adaptivity of the beam comes from embedded piezoelectric actuators which are used to enhance the damping of the beam. The dynamic model is based on Hamilton's variational principle and the interactions between the beam and the devices are modeled using Eshelby's equivalent inclusion method. The Rayleigh-Ritz technique is used to obtain the approximate behavior of the structure.

关键词： Actuators Sensors Instrument modeling Microactuators Calcium Fourier transforms Motion models Mechanical engineering Sensing systems smart structures

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