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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91-100 订阅

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control of a drop-ejector used as photo-resist dispenser

Control of a drop-ejector used as photo-resist dispenser

引用

SPIE conference on mathematics and control in smart structures

作者： Roche, PE Hansson, A Khuri-Yakub, BT Stanford Univ Edward L Ginzton Lab Stanford CA 94305 USA

ISBN: (纸本)0819427675

Photo-resist dispensers traditionally apply a generous amount of resist on the wafer and then spin the wafer to reach a uniform desired thickness. With this technique, over 95% of expensive and hazardous liquid is wasted. The goal of this project is to reduce the waste by using a drop-on-demand ejection technology to apply the photo-resist. In practice, a controller turns out to be necessary to compensate for the variability of the performance of the ejectors, to insure the stability of the ejection, and to speed up the transient regime for drop-on-demand operation. This paper reports on the design and simulation of this controller.

关键词： smart structures control piezoelectric drop-ejector modeling non-linear

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Optimal Design of Piezoelectric smart structures for active cabin noise control

Optimal Design of Piezoelectric Smart Structures for active ...

引用

SPIE conference on mathematics and control in smart structures

作者： Kim, JW Ko, BJ Lee, JK Nan, MH Inha Univ Dept Engn Mech Smart Struct & Syst Lab Nam Ku Inchon 402751 South Korea

ISBN: (纸本)0819427675

Optimal design of piezoelectric smart structures is studied for cabin noise problem and an experimental verification is investigated. A rectangular enclosure of which one side of the enclosure is made with a plate while the rest sides are assumed to be rigid is considered as a cabin. Disk shaped Piezoelectric sensors and actuators are mounted on the plate structure and the sensor signal is returned to the actuator with a negative gain. An optimal design of the piezoelectric structures for active cabin noise control is performed. The design variables are locations and sizes of disk shaped piezoelectric actuators and sensors, and actuator gain. The excitation frequency is chosen for a resonance as well as off resonance of the coupled system. To model the enclosure structure, the finite element method which is based on a combination of three dimensional piezoelectric, flat shell and transition elements, is used. For the interior acoustic medium, the theoretical solution of a rectangular cavity in the absence of elastic structure is used and the coupling effect is included in the finite element equation. The optimal design is performed at several frequencies and the results show a remarkable noise reduction in the cavity. An experimental verification of the optimally designed configuration is performed and it confirms the feasibility of piezoelectric smart structures in cabin noise problems.

关键词： optimal design piezoelectric smart structures finite element modeling cabin noise control

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smart structures featuring imperfect bonding interfaces: Modeling and implications

Smart structures featuring imperfect bonding interfaces: Mod...

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SPIE conference on mathematics and control in smart structures

作者： Icardi, U Di Sciuva, M Librescu, L Politecn Torino Dipartimento Ingn Aeronaut & Spaziale I-10129 Turin Italy Virginia Polytech Inst & State Univ Dept Engn Sci & Mech Blacksburg VA 24061 USA

ISBN: (纸本)0819427675

This paper is devoted to the dynamic modeling and control of multilayered smart beams of solid cross-section with surface-bonded piezoactuator layers. In contrast to the classical assumption of the perfect bonding of constituent layers, herein the existence of interfacial bonding imperfections among the layers of the host structure is stipulated. The requirements of shear traction continuity and displacement jump across each interface are used to model structures featuring imperfect bonding. Their implications on free and forced vibration control is analyzed via a combined dynamic feedback control law relating the piezoelectrically induced bending moment at the beam tip with the various kinematic response quantities. Numerical results for cantilever adaptive beams experiencing flexural motion under transient distributed loading are presented. For the case of an out-of-phase electrical activation of the smart structure, implications of the interface bonding imperfections on the structural quantities are investigated. The obtained results reveal the powerful role played by the proposed control methodology towards enhancing the dynamic response of cantilevered multilayered anisotropic beams to transient loadings. Also, the results are likely to contribute to a better understanding and reliable design of smart structures featuring interfacial bonding imperfections.

关键词： Interfaces Multilayers Feedback control smart structures Actuators Solids Composites Kinematics Vibration control Motion models

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Real-time structural health monitoring using model-based observers

Real-time structural health monitoring using model-based obs...

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SPIE conference on mathematics and control in smart structures

作者： Kranock, SJ Peterson, LD Univ Colorado Dept Aerosp Engn Sci Boulder CO 80309 USA

ISBN: (纸本)0819427675

This paper introduces a technique for non-destructive, real-time health monitoring using a model-based observer to determine the onset and location of unintended changes in a structure. These changes could be caused by slipping in joints or latches in deployed structures, or by damage to structural components. An algorithm for calculating the observer feedback gains which allow localization of these changes is described. The algorithm is based on ideas from noninteracting control theory. The validity of the technique is demonstrated by applying it to a computer model of a structure.

关键词： damage detection damage localization damage isolation second-order observers noninteracting control output decoupling

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A closed form solution for a composite plate with distributed actuators and sensors

A closed form solution for a composite plate with distribute...

引用

SPIE conference on mathematics and control in smart structures

作者： Suleman, A Goncalves, MA Univ Tecn Lisboa IDMEC Dept Engn Mecan Inst Super Tecn P-1096 Lisbon Portugal

ISBN: (纸本)0819427675

The objective of this paper is to describe the development of an analytical closed form solution to model a composite adaptive plate with embedded or bonded piezoelectric actuators and sensors. The mathematical model which describes the electromechanical coupling, the equations of motion and the boundary conditions is based on the Mindlin displacement field and on the Hamilton principle. The electromechanical coupling is a consequence of the piezoelectric characteristics of the actuator and sensor materials. This mathematical modelling technique for distributed actuators and sensors embedded in a composite adaptive plate is based on the Heaviside function.

关键词： adaptive composite structures piezoelectric actuators and sensors mathematical modelling

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Dynamic response control of cantilevers to time-dependent external excitations using optimal feedback control and smart materials technology

Dynamic response control of cantilevers to time-dependent ex...

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SPIE conference on mathematics and control in smart structures

作者： Na, S Librescu, L Korea Poltechn Univ Dept Automat Engn Keongki Do 429450 South Korea

ISBN: (纸本)0819427675

The problem of controlling the dynamic response of cantilevers exposed to blast loading is addressed. The structure to be controlled consists of a thin-walled beam of a closed cross-section contour which encompasses a number of non-classical features such as transverse shear, primary and secondary warping and anisotropy of the constitutent materials. The control is achieved via the use of the directionality property featured by advanced composite materials and of the actuating capabilities provided by piezoelectric devices which are bonded or embedded into the host structure. The cases of the piezoactuators spread over the entire span of the structure or in the form of a patch are considered, and issues related with the influence of the patch location upon the control efficiency are discussed. Other issues related with the minimization of the input power required, and implications of the limitation of control input voltage are also addressed.

关键词： structural tailoring piezoactuators piezopatch optimal control dynamic response

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Optimal control of distributed actuator and sensor arrays

Optimal control of distributed actuator and sensor arrays

引用

SPIE conference on mathematics and control in smart structures

作者： Bamieh, B Paganini, F Dahleh, M Univ Calif Santa Barbara Ctr Control Engn & Computat Santa Barbara CA 93106 USA

ISBN: (纸本)0819427675

We consider optimal H-2 and H-infinity control design problems for distributed parameter systems with large arrays of sensors and actuators. We assume that the actuator and sensor array forms a regular lattice, and that the underlying dynamics have a property of spatial invariance with respect to shifts in the lattice. We show how Fourier transforms over the spatial domain reduces the optimization to a family of standard, finite-dimensional problems over spatial frequency. The solutions are then obtained by parameterized families of matrix algebraic Riccati equations. Such optimal controllers have a natural decentralized and separation structure which we analyze.

关键词： distributed parameter systems optimal and robust control actuator and sensor arrays spatial invariance

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Application of genetic algorithm to the determination of multiple positive position feedback controller gains for smart structures

Application of genetic algorithm to the determination of mul...

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SPIE conference on mathematics and control in smart structures

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

ISBN: (纸本)0819427675

This paper is concerned with the determination of multiple positive position feedback controller gains using genetic algorithms. The genetic algorithms have proven its effectiveness in searching optimal design parameters without falling into local minima thus rendering globally optimal solutions. The use of genetic algorithms to the controller design have been investigated by many researchers but limited to the PLD control, and optimal controls. In this paper, the genetic algorithm is applied to the positive position feedback control which has been successfully used for the active vibration suppression of smart structures. The advantage of the positive position feedback controller is that it can be easily implemented in analog circuits and each mode can be tackled independently. However, the disadvantage is that the natural vibration characteristics should be accurately determined a priori either theoretically or experimentally. In this paper, we develop a new algorithm for the determination of controller gains based on the genetic algorithm. Hence, the traditional positive position feedback controller can be used in adaptive fashion. Experimental results will prove its effectiveness.

关键词： Intelligent structures

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Optimal design of compliant mechanisms for smart structures applications

Optimal design of compliant mechanisms for smart structures ...

引用

SPIE conference on mathematics and control in smart structures

作者： Frecker, MI Kota, S Kikuchi, N Penn State Univ Dept Mech & Nucl Engn University Pk PA 16802 USA

ISBN: (纸本)0819427675

Compliant mechanisms are currently used in conjunction with induced-strain actuators to provide stroke amplification. These compliant or flexure mechanisms are preferred over conventional rigid-link amplifiers because they avoid problems with clearances in mechanical joints. Many of the current compliant amplifiers are designed using ad-hoc or intuitive methods, however. In this paper, a topology optimization algorithm developed for systematic design of compliant mechanisms is applied to the design of compliant stroke amplifiers for induced-strain actuators. The underlying formulation for the optimization method is presented, and is then illustrated by two design examples. The functionality of the optimal solutions are verified by finite element analyses.

关键词： compliant mechanisms topology optimization induced-strain actuators stroke amplification

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Robust integrated structural and control design for vector second-order systems via LMIs

Robust integrated structural and control design for vector s...

引用

SPIE conference on mathematics and control in smart structures

作者： Mayzus, A Grigoriadis, K Univ Houston Dept Engn Mech Houston TX 77204 USA

ISBN: (纸本)0819427675

Iterative redesign techniques are proposed to integrate the design of the structural parameters and the active control parameters for vector second-order lumped-parameter structural systems. The objective is to minimize the required active control effort to satisfy given output variance constraints and robust performance constraints. The problem is formulated as an iterative sequential control design followed by control/structure redesign. Each step of the iterative algorithm is formulated as a Linear Matrix Inequality (LMI) optimization problem that can be solved effectively using available LMI solvers. Convergence of the proposed algorithm to a solution that provides improved control effort and robust stability compared to the single-step structural design followed by control design is guaranteed. Both static state-feedback and dynamic output feedback problems are considered. Numerical examples demonstrate the use of the proposed iterative algorithms.

关键词： structural control robust control integrated design computational methods

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