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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261-270 订阅

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Vibration and dynamic response control of adaptive cantilevers carrying externally mounted stores

Vibration and dynamic response control of adaptive cantileve...

引用

smart structures and materials 1997: mathematics and control in smart structures

作者： Librescu, Liviu Na, S.S. Virginia Polytechnic Inst. and State Univ. Blacksburg VA USA

ISBN: (纸本)0819424528

The vibrational and dynamic response control of cantilevers carrying externally mounted stores is investigated. The cantilevered structure is modeled as a thin-walled beam of arbitrary cross-section and incorporates a number of non- classical effects such as transverse shear, secondary warping, anisotropy of constituent materials and heterogeneity of the construction. The control is carried out via a dynamic bending moment applied at the tip of the structure. A feedback control law relating the boundary moment with one of the kinematical variables characterizing the response of the beam is implemented, and its results upon the closed-loop eigenfrequencies and dynamic response are highlighted. The obtained numerical results emphasize the efficiency of this control methodology to enhance, without weight penalties, vibrational and dynamic response behavior and inhibit and even suppress the occurrence of the resonance phenomenon.

关键词： Vibration control

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Cyclic voltametry and microwave characterization of smart materials based on polymer electrolyte composites

Cyclic voltametry and microwave characterization of smart ma...

引用

smart structures and materials 1997: mathematics and control in smart structures

作者： Barnes, Alan Despotakis, Anthony Wong, T.C.P. Anderson, Alan P. Chambers, Barry Wright, Peter V. Univ. of Sheffield Sheffield UK

ISBN: (纸本)0819424528

The fabrication of conducting polymer - silver-polymer electrolyte composite materials is described. Discs of these materials mounted in a coaxial test fixture exhibit rapid and reversible changes in their microwave impedance when small electric fields are applied across them. The effect of the concentration of conducting polymer on the cyclic voltammetry and microwave characteristics of the composites is discussed. Comparison of the cyclic voltammetry and microwave results has shown that changes in the gradients of the cyclic voltammograms coincide with large changes in microwave reflectivity. The results are consistent with the conducting polymer being switched from an insulating to a conducting state when the fields are applied. The reverse change occurs when the field is removed. Microwave coaxial line measurements for annular samples are presented and an equivalent network model comprising a parallel resistor and capacitor has been fitted to the measured data. Scanning electron microscopy studies on both the cycled and uncycled composites are presented and the results suggest that during cycling, the silver metal dissolves and is then re- precipitated.

关键词： Intelligent materials

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Modeling and dynamic behavior of rotating blades carrying a tip mass and incorporating adaptive capabilities

Modeling and dynamic behavior of rotating blades carrying a ...

引用

smart structures and materials 1997: mathematics and control in smart structures

作者： Song, Ohseop Librescu, Liviu Kim, Hong-Bae Choong-Nam Natl. Univ. Taejon South Korea

ISBN: (纸本)0819424528

The problems of the mathematical modeling and dynamical behavior of rotating blades carrying a tip mass and incorporating adaptive capabilities are considered. The blade is modeled as a thin-walled beam which encompasses features such as the anisotropy, transverse shear, secondary warping and includes the centrifugal and Coriolis force fields. In addition, the adaptive capabilities provided by a system of piezoactuators bonded or embedded into the structure are also implemented. Based on the converse piezoelectric effect, the piezoactuators produce a localized strain field in response to an applied voltage, and as a result, an adaptive change of the dynamic response characteristics is obtained. A combined feedback control law relating the piezoelectrically induced bending moment at the beam tip with the kinematical response quantities appropriately selected is used, and its beneficial effects upon the closed-loop eigenvibration characteristics are highlighted.

关键词： Intelligent structures

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Piezoelectric power requirements for active vibration control

Piezoelectric power requirements for active vibration contro...

引用

smart structures and materials 1997: mathematics and control in smart structures

作者： Brennan, Matthew C. McGowan, Anna-Maria R. George Washington Univ. Hampton VA USA

ISBN: (纸本)0819424528

This paper presents a method for predicting the power consumption of piezoelectric actuators utilized for active vibration control Analytical developments and experimental test show that the maximum power required to control a structure using surface-bonded piezoelectric actuators is independent of the dynamics between the piezoelectric actuator and the host structure. The results demonstrate that for a perfectly-controlled system, the power consumption is a function of the quantity and type of piezoelectric actuators and the voltage and frequency of the control law output signal. Furthermore, as control effectiveness decreases, the power consumption of the piezoelectric actuators decreases. In addition, experimental results revealed a nonlinear behavior in the material properties of piezoelectric actuators. The material nonlinearity displayed a significant increase in capacitance with an increase in excitation voltage. Tests show that if the nonlinearity of the capacitance was accounted for, a conservative estimate of the power can easily be determined.

关键词： Vibration control

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Actuation for simultaneous motions and constraining efforts: an open chain example

Actuation for simultaneous motions and constraining efforts:...

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smart structures and materials 1997: mathematics and control in smart structures

作者： Perreira, N.Duke Lehigh Univ. Bethlehem PA USA

ISBN: (纸本)0819424528

A brief discussion on systems where simultaneous control of forces and velocities are desirable is given and an example linkage with revolute and prismatic joint is selected for further analysis. The Newton-Euler approach for dynamic system analysis is applied to the example to provide a basis of comparison. Gauge invariant transformations are used to convert the dynamic equations into invariant form suitable for use in a new dynamic system analysis method known as the motion-effort approach. This approach uses constraint elimination techniques based on singular value decompositions to recast the invariant form of dynamic system equations into orthogonal sets of motion and effort equations. Desired motions and constraining efforts are partitioned into ideally obtainable and unobtainable portions which are then used to determine the required actuation. The method is applied to the example system and an analytic estimate to its success is made.

关键词： control systems

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Sensor and actuator topology for vibration control and parameter estimation

Sensor and actuator topology for vibration control and param...

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smart structures and materials 1997: mathematics and control in smart structures

作者： Friswell, Michael I. Inman, Daniel J. Univ. of Wales Swansea Swansea UK

ISBN: (纸本)0819424528

Active vibration control is using increasingly large numbers of sensors and actuators to achieve ever-improving results in the control of distributed systems. As the number of actuators and sensor increases, computational effort for control purposes increases. As the number of actuators and sensors grows, so too does the frequency range over which it is sensible to attempt active control and the time available for control calculations is therefore shrinking. Notwithstanding the remarkable rate at which processor speeds continue to increase, it is evident that full multi- input multi-output control cannot continue to be applied for increasing numbers of sensors and actuators. The requirements for every actuator to have an amplifier and every sensor to have signal conditioning is also very demanding. This paper addresses the issue of how best to implement the controller and estimator in smaller sensor/actuator groups and to determine the optimum topology, or grouping, of the sensors and actuators. The demands of both the control and the parameter estimation are addressed, and the implementation of modal control and selective sensitivity estimation algorithms are described.

关键词： Vibration control

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Finite element modeling of active cabin noise control problems

Finite element modeling of active cabin noise control proble...

引用

smart structures and materials 1997: mathematics and control in smart structures

作者： Kim, Jaehwan Varadan, Vasundara V. Ko, Bumjin Inha Univ. Incheon South Korea

ISBN: (纸本)0819424528

Modeling of piezoelectric smart structures applied in a cabin noise problem is studied. Cubic shaped acoustic cavity with flat plate which covers one side is taken as the problem. Noise source locates outside of the box and the noise propagates into the interior region through the plate structure. Disk shaped piezoelectric actuators are mounted on the plate and the actuators are excited. The actuators will generate a proper response to reduce the pressure fields at a certain region in the cavity. The plate structure is modeled using finite element method which is based on a combination of 3D piezoelectric, flat shell and transition elements. The transition element connects the 3D and flat shell elements. Acoustic cavity is modeled using modal approach which represents the pressure fields in the cavity, finite element equation for the structure with the influence of acoustic cavity is derived. Once the structure response is found by solving the finite element equation, the pressure fields at the inside of the cavity are recovered directly. Numerical results show the pressure fields at the inside of the cavity are recovered directly. Numerical results show the pressure fields at the inside of the box. No activation results are examined at different frequencies to see the feasibility of the proposed modeling approach. When the actuators are activated, the results of pressure fields inside of the cavity show that the cabin noise at a certain zone inside the cavity can be reduced. Future works to improve cabin noise control performance are addressed.

关键词： Intelligent structures

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Excitation dyadics for the grids of chiral and omega particles

Excitation dyadics for the grids of chiral and omega particl...

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smart structures and materials 1997: mathematics and control in smart structures

作者： Simovski, Constantine R. Kondratjev, Michael S. Belov, Pavel A. Tretyakov, Sergei A. St. Petersburg Inst. of Fine Mechanics and Optics St. Petersburg Russia

ISBN: (纸本)0819424528

The electromagnetic excitation of 2D array of bianisotropic particles by plane waves is considered. The array is assumed to be infinite and the particles to be small compared with the wavelength so that the dipole approximation is available. The electromagnetic interaction between tall the particles is taken into account analytically. Two kinds of bianisotropic particles: chiral particles and omega particles are analyzed. Both the electric and magnetic moments of each particle are related to each other and depend on the local field. Therefore, the standard approach used in the theory of scanning antenna arrays cannot be applied. The analytical model under consideration allows to express the electric and magnetic moments induced in each particle through incident wave field amplitudes. These relations are dyadic ones.

关键词： Intelligent structures

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Critical behavior of transport in percolation-controlled smart composites

Critical behavior of transport in percolation-controlled sma...

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smart structures and materials 1997: mathematics and control in smart structures

作者： Golden, Kenneth M. Univ. of Utah Salt Lake City UT USA

ISBN: (纸本)0819424528

The electrical transport properties of many smart composites and other technologically important materials are dominated by the connectedness, or percolation properties of a particular component. Predicting the critical behavior of such media near their percolation threshold, where one typically obtains the most interesting and useful material properties, is a formidable challenge, and not well understood from a modeling perspective. Here we report on recent mathematical results on lattice and continuum percolation models of these types of materials. In particular, we have found a direct, analytic correspondence between the critical behavior of transport in two component random media around a percolation threshold, and the critical behavior exhibited by phase transitions in statistical mechanics, such as by the magnetization of a ferromagnet around its Curie point. This correspondence has been used to establish that the critical exponents for DC conduction ear a percolation threshold, for both lattice and continuum systems, satisfy the same scaling relations as their counterparts in statistical mechanics. Underlying our correspondence is an integral representation for the effective conductivity, which has exactly the same mathematical form as a corresponding representation for the magnetization of an Ising ferromagnet. The integral representation applies in general to many classical transport coefficients for two component media, and we have used it to obtain rigorous insulator-conductor composites is investigated here, and even when the inclusions are near to touching, the new bounds give a dramatic improvement over the complex versions of the fixed volume fraction and Hashin-Shtrikman bounds found independently by Milton and Bergman in the late 1970's.

关键词： Shape memory effect

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Narrowband disturbance rejection using adaptive feedback algorithms

Narrowband disturbance rejection using adaptive feedback alg...

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smart structures and materials 1997: mathematics and control in smart structures

作者： Bodson, Marc Douglas, Scott C. Univ. of Utah Salt Lake City UT USA

ISBN: (纸本)0819424528

Two adaptive algorithms that reject narrowband disturbances of unknown frequency are compared. The first is based on an adaptive implementation of the internal model principle. The second is based on a phase-locked loop structure and generates a signal whose magnitude and phase match those of the disturbance. The adaptive internal model principle algorithm provides global stability under ideal conditions, tracks reference inputs, and can stabilize unstable plants. However, the algorithm suffers from convergence and robustness problems in simulations and does not appear to be well-suited to high-order systems or systems with unknown time delays, two situations that are typically encountered in active noise control applications. The algorithm based on the phase-locked loop concept has better convergence and robustness properties and can be applied to aborad range of stable systems. Some prior information is required about the magnitude and frequency of the disturbance and about the frequency response of the plant, however. A real-time implementation of the phase-locked loop scheme in an active noise control task provides a 25 dB reduction of a sinusoidal tone of unknown frequency.

关键词： Intelligent structures

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