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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211-220 订阅

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smart structures featuring imperfect bonding interfaces: Modeling and implications

Smart structures featuring imperfect bonding interfaces: Mod...

引用

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

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

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

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

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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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control of vibration of a base excited beam

Control of vibration of a base excited beam

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SPIE Conference on mathematics and control in smart structures

作者： Chou, CS Ho, CD Natl Taiwan Univ Inst Appl Mech Taipei 106 Taiwan

ISBN: (纸本)0819427675

control of vibration of a base excited cantilever beam is studied in this paper. The algorithm of the control system is based on the concept of active attenuation;the traveling wave of the structural response caused by external excitation can be annihilated by a control wave of opposite signature. Collocated sensor and actuator are used to sensing the traveling wave and generating the control wave. Experimental and numerical results showed that the vibration of a cantilevered beam is substantially suppressed.

关键词： active attenuation collocate cantilever beam

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Behavior of SMA actuators under non-proportional thermomechanical loading

Behavior of SMA actuators under non-proportional thermomecha...

引用

SPIE Conference on mathematics and control in smart structures

作者： Bo, ZH Lagoudas, DC Miller, D Texas A&M Univ Dept Aerosp Engn Ctr Mech Composites College Stn TX 77843 USA

ISBN: (纸本)0819427675

The application of SMA actuators in smart structures usually involve thermally induced phase transformation with a variable applied stress in SMA actuators, resulting in thermomechanical non-proportional loading of SMAs in stress-temperature space. To investigate the constitutive response of SMAs under thermomechanical non-proportional loading, experiments for thermally induced phase transformation of binary NiTi SMA wires loaded by an elastic linear spring are performed in the Active materials Laboratory at Texas A&M University. A constitutive model developed by Bo and Lagoudas (1998a,b,c) and Lagoudas and Bo (1998) is used as the basis for the theoretical prediction of the response of SMA line actuators loaded by springs with different elastic constants. Model predictions are compared with experimental results.

关键词： Shape memory alloys Actuators Data modeling smart structures Thermal modeling Binary data Fluctuations and noise Temperature metrology Data acquisition Sun

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Vibration and instability of spinning thin-walled beams featuring anistropy and pretwist and incorporating adaptive capabilities

Vibration and instability of spinning thin-walled beams feat...

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SPIE Conference on mathematics and control in smart structures

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

ISBN: (纸本)0819427675

An integrated dual approach aiming at controlling the dynamic behavior of anisotropic pretwisted beams rotating with constant angular speed about their longitudinal body axis fixed in the inertial space is presented. The approach is based upon the simultaneous implementation and use of the directionality property featured by the composite materials and of adaptive material systems technology. While the former control technique uses the anisotropy properties of the advanced composite material structures, the latter one exploits the actuating capabilities provided by the piezoelectric materials which are bonded or embedded into the host structure. A dynamic control law relating the piezoelectrically induced boundary bending moments with conveniently selected dynamic response characteristics of the structure is implemented, and its results upon the closed-loop eigenfrequencies of spinning beams are highlighted.

关键词： Anisotropy Composites Feedback control Actuators Adaptive control control systems Copper Vibration control Mechanical engineering Mechanics

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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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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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Optimal design of compliant mechanisms for smart structures applications

Optimal design of compliant mechanisms for smart structures ...

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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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High spatial resolution soliton DOFS for smart structures

High spatial resolution soliton DOFS for smart structures

引用

SPIE Conference on mathematics and control in smart structures

作者： Song, MP Tang, WZ Zhou, W Zhejiang Univ Dept Informat & Elect Engn Hangzhou 310027 Peoples R China

ISBN: (纸本)0819427675

From the advantage and defect of current distributed optical-fiber sensor(DOFS) schemes, It could be seen that most of schemes except distributed anti-Stokes Ratio Termometry(DART) are only possible in experiment, but unpractical. But DART is not able to be used on small and fine things especially for smart structures, because of its poor spatial resolution. As we all know that the relaxation time of Raman scattering is in the femtosecond range, and a optical pulse with width >1ps will not receive gain reducing, so the potential spatial resolution of DART can be smaller than 0.1m, even 1mm(for a pulse with width <10ps). Considering these, we firstly propose a novel scheme of DOFS based on spontaneons Raman back-scatering and the effect of high-order soliton, which uses Time-correlated Single Photon Counting(TCPC) as detector. The first-order and high-order solitons' effect in the system are theoretically investigated, and it is found that it is able to improve the spatial resolution observably by using high-order soliton in relatively short sensing distance(<1km). In the end, the possibility and difficulties of realizing the system based on present-day level of devices are considered.

关键词： distributed optical-fiber sensor soliton spatial resolution back-scattering light smart structures

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