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检索条件"任意字段=Smart Structures and Materials 1995: Mathematics and Control in Smart Structures"

共 525 条记录，以下是271-280 订阅

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Sensor and actuator topology for vibration control and parameter estimation

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

引用

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...

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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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Problem of the local field for plane grids with bianisotropic particles

Problem of the local field for plane grids with bianisotropi...

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

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

ISBN: (纸本)0819424528

A problem of local field for 2D regular and weakly non- regular arrays of bi-anisotropic particles is considered. Such arrays are excited by an incident plane electromagnetic wave. The local field is formed by incident wave and by all the particles besides an arbitrary chosen particle under consideration which can be named as zero-particle. For infinite or very large arrays we can express the local fields with only tow vector complex values which are to be defined in frames of the separate problem of an exciting and scattering by such grids. But the equations relating electric and magnetic dipole moments of zero-particle with an incident wave field are that we find in this paper. Since these moments can be easily related with the surface density of electric and magnetic moments averaged on the grid surface the equations under consideration are analogues with the known local field formulae in theories of 3D media. Our relations are given by several dyadics which are named below as key dyadics.

关键词： Intelligent structures

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Nonlinear modeling for control of Terfenol-D-based actuators

Nonlinear modeling for control of Terfenol-D-based actuators

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

作者： Dozor, David M. Gerver, Michael J. Swenbeck, J.R. SatCon Technology Corp. Belmont MA USA

ISBN: (纸本)0819424528

Nonlinear modeling and control methods can be used to increase the usable range of operation of Terfenol-D. Presently, in dynamic applications the usable range of Terfenol-D is often limited to approximately 850ppm. This limitation is imposed by harmonic distortion, spurious vibration, and/or tracking error considerations. These nonlinear effects are due to large variations in the magnetoelastic parameters and hysteresis. The preliminary results of this program indicate that a large performance advantage may be gained through proper control of the nonlinearities. As an example, a recently designed reaction mass actuator that weighs 1.125lbm can produce peak forces as high as 125lbf. However, to limit the open-loop total harmonic distortion to less than 2 percent requires that peak forces be limited to roughly 65lbf. To determine the magnetoelastic parameters, quasi-static experiments were performed with a specially designed apparatus. The research included modeling and simulation based on the static nonlinear magnetoelastic equations. Under assumptions of quasi-static magnetoelastic behavior, a fourth-order linear model was extended with the static nonlinearities. The model is compared with preliminary experiments. These types of models will allow nonlinear control strategies to be developed for Terfenol-D based actuators, thus extending the harmonic-free operating range.

关键词： control systems

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Antiphase control system for active microvibration damping onboard satellites

Antiphase control system for active microvibration damping o...

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

作者： Vaillon, Ludovic H. Philippe, Christian Matra Marconi Space Toulouse Fr

ISBN: (纸本)0819424528

Disturbances attenuation, typically up to 200 Hz, onboard satellites is a key issue for advanced optical space systems with stringent spatial and temporal resolution requirements. Under ESA contract, Matra Marconi Space has conducted an ambitious proof-of-concept programme aiming at designing and demonstrating through prototypes and test innovative active vibration damping systems. In particular, a centralized anti-phase control (APC) system operating on distributed sensors and actuators to compensate stationary harmonic disturbances has been breadboarded and tested. The APC algorithm involves three major functions: (i) extraction of the harmonics signal by synchronous demodulation, (ii) identification of the complex gains between sensors and actuators using a recursive least squares algorithm, and (iii) anti-phase computation. The control algorithm has been implemented on a real-time test bench based on a fast DSP computer. The experiment has been performed on an engineering model of a representative space platform, namely MARCOTS. The measured performances, i.e. harmonic rejection at the controlled frequencies, range from 20 to 40 dB and are consistent with predictions from numerical simulations. Finally, a major advantage of the APC algorithm is intrinsic robustness to actuator failures, without performance impact for a single failure and 10 dB degradation for a double failure.

关键词： Vibration control

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control of sound radiation from a plate into an acoustic cavity using active piezoelectric-damping composites

Control of sound radiation from a plate into an acoustic cav...

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

作者： Shields, Wilfred H. Ro, J. Baz, Amr M. Catholic Univ. of America Arnold MD USA

ISBN: (纸本)0819424528

Sound radiation from a plate into an acoustic cavity is controlled using patches of active piezoelectric-damping composites (APDC). The APDC, under consideration, consists of piezoelectric fibers embedded across the thickness of a visco-elastic matrix in order to control the compressional damping characteristics of the composite. The effectiveness of the APDC treatments in attenuating the sound radiation from thin plates into cavities is demonstrated theoretically and experimentally. A finite element model (FEM) is developed to describe the dynamic interaction between the plate, the APDC patches and the acoustic cavity. The FEM is used to predict the dynamics of the plate/acoustic cavity and the sound pressure distribution for different control strategies. The predictions of the FEM are validated experimentally using a square aluminum plate whose sides are 29.8 cm and thickness of 0.04 cm. The plate is mounted on a 29.8 cm × 29.8 cm × 75 cm cavity. The test plate is treated with a single APDC patch placed at the plate center. The patch is 5 cm × 5 cm × 0.03125 cm which is made of 15-25 percent lead zirconate titanate fibers embedded in soft and hard polymeric resin matrices and provided with silver-epoxy electrodes. Vibration and sound pressure level attenuations of about 70 percent are obtained a the plate/cavity first mode of vibration, with a maximum control voltage of 330 volts using a derivative feedback controller. Such attenuations are attributed to the effectiveness of the APDC treatment in increasing the modal damping ratios by about a factor of four over those of conventional passive constrained layer damping treatments. Comparisons between the theoretical predictions of the FEM with the experimental results indicate close agreement between theory and experiments. The obtained results suggest the potential of the APDC treatments in controlling the sound radiation from plates into acoustic cavities. Such potential can be exploited in many critical applicati

关键词： Acoustic waves

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smart structures and materials 1996: mathematics and control in smart structures

Smart Structures and Materials 1996: Mathematics and Control...

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smart structures and materials 1996: mathematics and control in smart structures

The proceedings contains 60 papers. Following topics are discussed: control of smart structures;shape memory alloys;mathematics of control;ferroelectric materials;control theory;finite element modeling;active/passive ... 详细信息

ISBN: (纸本)0819420905

关键词： Intelligent structures

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