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检索条件"任意字段=Conference on Mathematics and Control in Smart Structures"

共 142 条记录，以下是51-60 订阅

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Collocated sensing and actuation for vibration control of adaptive anisotropic thin-walled beams

Collocated sensing and actuation for vibration control of ad...

引用

smart structures and Materials 1999 conference

作者： Song, O Kim, JB Librescu, L Chungnam Natl Univ Dept Mech Engn Taejon 305764 South Korea

ISBN: (纸本)0819431419

The problems of the mathematical modeling and dynamical response of thin-walled beam structures including a number of non-classical features and incorporating adaptive capabilities are considered. The theory of thin-walled beams as considered in this study encompasses non-classical features such as. anisotropy, transverse shear and secondary warping, whereas the adaptive capabilities are provided by a system of piezoelectric devices whose sensing and actuating functions are combined and which are bonded or embedded into the host structure. The synergistic implications of the application of both tailoring and collocated sensing-actuating capabilities upon the closed-loop dynamic response are presented and pertinent conclusions are outlined.

关键词： thin-walled beams adaptive materials feedback control collocated control flapping-lagging motion structural tailoring

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control of SMA actuators in dynamic environments

Control of SMA actuators in dynamic environments

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smart structures and Materials 1999 conference

作者： Webb, G Wilson, L Lagoudas, D Rediniotis, O Texas A&M Univ Dept Aerosp Engn College Stn TX 77843 USA

ISBN: (纸本)0819431419

The strain-temperature hysteresis for shape memory alloy (SMA) actuators has: been shown, to undergo large changes according to the applied load. This paper provides an adaptive hysteresis model capable of accounting for a time-varying hysteresis, specifically SMA hysteresis under a, varying applied stress. Previous research has established excellent performance, in both numerical and laboratory experiments, of the adaptive hysteresis model for actuators with fixed hysteresis. In this paper, the performance of the adaptive model when there are significant changes in the hysteresis characteristics is examined in laboratory tracking experiments.

关键词： hysteresis adaptive control SMA adaptive compensation hysteretic actuators

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Artificial Neural Network for piezoelectric control systems

Artificial Neural Network for piezoelectric control systems

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smart structures and Materials 1999 conference

作者： Bakhashwain, J Refaee, J Sunar, M Mohandes, M King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

ISBN: (纸本)0819431419

This paper presents a neural network controller for a piezoelectric controlled structure by emulating the control performance of a Linear Quadratic Gaussian (LQG) controller. The configuration of the Artificial Neural Network (ANN) is simple, yet it is efficient in terms of its high learning speed and good generalization ability. A case study is presented to demonstrate the performance of the ANN controller versus the LQG controller. The test results for different disturbances on the structure show excellent agreement between the ANN and LQG controllers.

关键词： neural network LQG controller piezoelectric structure

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Design of an optimum smart wing to enhance roll performance

Design of an optimum smart wing to enhance roll performance

引用

smart structures and Materials 1999 conference

作者： Khot, NS USAF Res Lab AFRL VASD Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819431419

This paper is concerned with designing an optimum flexible wing structure to enhance roll maneuver capability at high dynamic pressures using embedded actuating system. A wing optimized to minimize the weight with constraints on strength for symmetric pull up maneuver and constraints on the frequency distribution was used for this study. Elastic twist and camber is achieved by providing a system of actuating elements distributed within the internal substructure of the wing to provide control forces. The equilibrium equations were developed for the steady roll maneuver of a wing subjected to aerodynamic loads and actuating forces. Optimal control design approach was used to determine the distribution of actuating forces. The total straing energy was calculated as a measure of power requirement to produce twist and camber, to achieve specified flexible roll rate at different Mach numbers.

关键词： Actuators Aerodynamics control systems control systems design smart materials Fourier transforms Mathematical modeling Platinum Aerospace engineering Embedded systems

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Modeling of piezoelectric smart structures including absorbing materials for cabin noise problems

Modeling of piezoelectric smart structures including absorbi...

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smart structures and Materials 1999 conference

作者： Kim, J Lee, JK Im, BS Chung, CC Inha Univ Dept Mech Engn Smart Struct & Syst Lab Nam Ku Inchon 402751 South Korea

ISBN: (纸本)0819431419

Modeling of piezoelectric smart structures including absorbing material was studied for cabin noise problems, The finite element method which uses a combination of three dimensional piezoelectric, flat shell and transition finite elements is adopted to model the piezoelectric active structure. The acoustic pressure in the cubic shaped cavity is represented in terms of modes of the cavity and the absorbing material is modeled using surface acoustic impedance. Finally, the effect of the cavity pressure is introduced in the finite element equations. The simulation result of sound pressure in the cavity is compared with an experiment and they show a good agreement. The cavity pressure is reduced in a wide frequency range except the resonance frequencies of the plate by applying absorbing material. It can be concluded that the piezoelectric smart structures with absorbing materials can be a creative technology for cabin noise problems.

关键词： piezoelectric smart structures sound absorbing materials finite element modeling cabin noise problems

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Vibration and noise control using an optimal output feedback controller

Vibration and noise control using an optimal output feedback...

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smart structures and Materials 1999 conference

作者： Lim, YH Gopinathan, SV Varadan, VV Varadan, VK Penn State Univ Dept Engn Sci & Mech Res Ctr Engn Elect & Acoust Mat University Pk PA 16802 USA

ISBN: (纸本)0819431419

In this paper the design of an optimal controller using discretely placed collocated: sensor/actuator pairs to control the vibration of a plate structure is presented. Three-dimensional finite elements are: used to model the smart structure containing discrete piezoelectric sensors and actuators by the use of a combination of solid, transition, and shell elements. Since several discrete piezoelectric patches are spatially distributed in the structure to effectively observe and control the vibration of a structure, the system model is thus utilized to design multi-input-multi-output (MIMO) controller. The output feedback controller is then employed to emulate the optimal controller by solving the Riccati equations from modal space model. An optimal controller design for the vibration suppression of a clamped plate is presented for the steady state excitation case. The reduction in the sound pressure level inside an enclosure radiated from this optimally controlled vibrating plate is also estimated.

关键词： collocated sensor and actuators optimal feedback control Vibration and noise control

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Approximation of distributed control laws using distributed electronic devices for vibration control

Approximation of distributed control laws using distributed ...

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smart structures and Materials 1999 conference

作者： Lenczner, M Kader, M Mrcarica, Z Univ Franche Comte Equipe Math Besancon UMR 6623 F-25030 Besancon France

ISBN: (纸本)0819431419

In this work the control of vibration in an elastic plate, by piezoelectric transducers, is considered. The model of the plate is that presented in [2]. An approximation of the optimal controller by a derivative partial operator is given. It is based on a development in series of the Riccati operator with respect to the reverse of the stiffness. Its implementation in term of distributed analog electronic circuits, is developed. Numerical simulations, obtained by the coupling of Finite Elements code and a circuit simulator, Alecsis, are presented. To improve the preceding result an iterative algorithm. of approximation of the optimal controller, being able to be: implemented by an electronic circuit, is developed. The algorithm is inspired by the approach of [4].

关键词： Sensors Electronic circuits 3D modeling Analog electronics Vibration control Actuators control systems Differential equations Electronic components Mathematical modeling

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Real-time automatic tuning of vibration controllers for smart structures by genetic algorithm

Real-time automatic tuning of vibration controllers for smar...

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smart structures and Materials 1999 conference

作者： Kwak, MK Shin, TS Dongguk Univ Dept Mech Engn Joong Gu Seoul 100715 South Korea

ISBN: (纸本)0819431419

This paper is concerned with the real-time automatic tuning of the positive position feedback controller for smart structures by the genetic algorithms. The genetic algorithms have proven its effectiveness in searching optimal design parameters without falling into local minimums thus rendering globally optimal solutions. The advantage of the positive position feedback controller is that if it is tuned properly it can enhance the damping value of a target mode without affecting other modes. In this paper, we develop a real-time algorithm for determining a tuning frequency of the PPF controller based on the genetic algorithm. Hence, the traditional positive position feedback controller can be used in adaptive fashion in real time. To this end, the digital PPF control law is downloaded to the DSP chip and a main program, which runs genetic algorithms in real time, updates the parameter of the controller in real time. The real-time tuning of the PPF controller is applied to cases of initial disturbance and persistent harmonic disturbance. In both cases, the real-time tuning is achieved successfully. Hence, vibrations are suppressed satisfactorily. The experimental results also show that the PPF controller tuned by GA gives better performance than the manually tuned PPF controller for accommodating harmonic disturbances did.

关键词： active vibration control genetic algorithm disturbance accommodating control

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Modeling of electrodynamic properties control in liquid impregnated porous ferrite media

Modeling of electrodynamic properties control in liquid impr...

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smart structures and Materials 1999 conference

作者： Ponomarenko, AT Ryvkina, NG Kazantseva, NE Tchmutin, IA Shevchenko, VG Catton, I Travkin, VA Russian Acad Sci Enikolopov Inst Synthet Polymer Mat Moscow 117393 Russia

ISBN: (纸本)0819431419

Model and experimental investigations of electrodynamic properties of tunable structures from liquid-impregnated porous magnetic media are presented. Microwave spectra of complex permittivity and permeability of dry and liquid-impregnated media with ethyl alcohol or water-alcohol mixtures were measured. Real and imaginary parts of permittivity were found to exceed the upper Wiener boundary. Dielectric and magnetic properties of liquid-impregnated porous ferrite media were modeled using non-local volume averaging theory (VAT). This approach accounts for several hierarchical levels and morphology of the system.

关键词： Dielectrics Magnetism Composites Particles Liquids Ferromagnetics Mathematical modeling Data modeling Electrodynamics Microwave radiation

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Position control of a two-link flexible manipulator using piezoelectric actuators

Position control of a two-link flexible manipulator using pi...

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smart structures and Materials 1999 conference

作者： Choi, SB Shin, HC Kim, HK Kim, JH Inha Univ Dept Mech Engn Smart Mat & Struct Lab Inchon 402751 South Korea

ISBN: (纸本)0819431419

This paper presents a hybrid actuator scheme to actively control the end-point position of a two-link flexible manipulator. A highly nonlinear system model including inertial effects is established using Lagrange's equation associated with assumed mode method. control scheme consists of four different actuators;two servo-motors at the hubs and two piezoceramics bonded to the surfaces of the flexible links. Two sliding hyperplanes which have time varying parameters are designed for two servo-motors. The surface gradients of the hyperplanes are determined by pole assignment technique to guarantee the stability on the hyperplanes themselves. The sliding mode controllers corresponding to the hyperplanes are then synthesized on the basis of sliding mode conditions. During the motion, undesirable oscillations caused by the torques based on the rigid link dynamics an actively suppressed by applying feedback control voltages to the piezoceramic actuators. Consequently, desired rip motion is achieved. In order to demonstrate the effectiveness of the proposed methodology experiments are performed for the regulating and tracking control problem.

关键词： flexible manipulator piezoelectric actuator position control sliding mode control

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