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Proceedings of SPIE - The International Society for Optical Engineering 1998年 3323卷 743-744页

作者： Varadan, Vasundara V.

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Constitutive modeling and control of 1-D smart composite structures

Constitutive modeling and control of 1-D smart composite str...

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SPIE Conference on mathematics and control in smart structures

作者： Briggs, JP Ostrowski, JP Castaneda, PP Univ Penn Dept Mech Engn & Appl Mech Philadelphia PA 19104 USA

ISBN: (纸本)0819427675

Homogenization techniques for determining effective properties of composite materials may provide advantages for control of stiffness and strain in systems using hysteretic smart actuators embedded in a soft matrix. In this paper, a homogenized model of a one-dimensional composite structure comprised of shape memory alloys (SMA) and a rubber-like matrix is presented. With proportional (P) and proportional/integral (PI) feedback, using current as the input state and global strain as an error state, implementation scenarios include the use of tractions on the boundaries and a nonlinear constitutive law for the matrix. The result is a simple model which captures the nonlinear behavior of the smart composite material system and is amenable to experiments with various control paradigms. The success of this approach in the context of the one-dimensional model suggests that the homogenization method may prove useful in investigating control of more general smart structures. Applications of such materials could include active rehabilitation aids, e.g. wrist braces, as well as swimming/undulating robots, or adaptive molds for manufacturing processes.

关键词： homogenization composites control

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Active control methodology for thermal distortion management of smart composite structures

Active control methodology for thermal distortion management...

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SPIE Conference on mathematics and control in smart structures

作者： Koko, TS Orisamolu, IR Smith, MJ Akpan, UO Martec Ltd Res & Emerging Tehcnol Dept Halifax NS B3J 3J8 Canada

ISBN: (纸本)0819427675

This paper presents a an integrated finite element based computational methodology for analyzing smart composite structures with piezoelectric sensors and actuators. The method accounts for the coupling of the mechanical, electrical and thermal fields, which these structural systems will be subjected to in practical applications. Three dimensional thermopiezoelectric composite finite elements are used to model the host structure and the piezoelectric sensors and actuators. The finite element equations are integrated with control algorithms based on the linear quadratic regulator (LQR), independent modal space control (IMSC) and the modified independent modal space control (MIMSC), to provide active vibration control capabilities. The capabilities have been incorporated into a computer program called smartCOM. Numerical examples illustrating the computation and/or control of deformations due to thermal excitations are presented and comparisons are made to other methods where possible. The present method provides accurate modelling of the smart structures and is seen as a convenient methodology, in that it permits modelling of the complex behaviour of the smart structure in one integrated package.

关键词： smart structures thermopiezoelectricity LQR IMSC finite elements active vibration control thermal distortion management

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Optimal Design of Piezoelectric smart structures for active cabin noise control

Optimal Design of Piezoelectric Smart Structures for active ...

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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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Active vibration control of flexural-shear type frame structures with smart structures using piezoelectric actuators

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smart materials & structures 1998年第4期7卷 479-488页

作者： Kamada, T Fujita, T Hatayama, T Arikabe, T Murai, N Aizawa, S Tohyama, K Tokyo Univ Agr & Technol Koganei Tokyo Japan Univ Tokyo Inst Ind Sci Minato Ku Tokyo Japan Sumitomo Heavy Ind Ltd Hiratsuka Kanagawa Japan Takenaka Corp Chiba Japan

To apply smart structures to buildings, a new vibration control strategy is proposed for flexural-shear type frame structures with smart structures using piezoelectric actuators. Actuators are incorporated in columns, and the response of the entire structure is reduced by control of the bending moment and axial force of the columns. Combined application of these two controls is performed by arrangement of actuators. Two control strategies were tested: one involves the use of a model matching method and the other is based on HZ control theory. Excitation tests were conducted with a four-storey frame structure with a total weight of 2000 kg and a height of 3.7 m, having H-section steel beams incorporating actuators as columns. The effectiveness of combined use of bending moment control and axial force control of columns with smart structures was confirmed.

关键词： Intelligent structures

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Actuator limited robust controller design for smart structures using linear matrix inequalities

Actuator limited robust controller design for smart structur...

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SPIE Conference on mathematics and control in smart structures

作者： Sana, S Rao, VS Univ Missouri Elect Engn & Intelligent Syst Ctr Rolla MO 65409 USA

ISBN: (纸本)0819427675

smart Structural systems have gained lot of importance now-a-days and have found to have applications in several areas especially in the areas of aerospace, automotive and space applications. One of the essential aspects involved in the integration of smart structures is that of the control system design. Actuator limitation poses as a major obstacle in the real-time implementation of controllers for smart structural systems. This paper gives an account of the application of a controller design procedure to handle control input limitation problem in the design of controllers for smart structures. This procedure, called the limit protection design approach, uses a two-step design procedure to design a control system to achieve graceful degradation of performance in the presence of control input limitation. The solution of the limit protection compensator involves solving a set of bilinear matrix inequalities (BLMIs). An iterative procedure is given for the solution of the BLMIs. Finally, we give the simulation results got from applying the above said procedure on an experimental smart structure.

关键词： control systems design control systems smart structures Actuators Intelligence systems Matrices Ferroelectric materials Sensors Structural design Vibration control

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Pattern control in unstable structures

Pattern control in unstable structures

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SPIE Conference on mathematics and control in smart structures

作者： Guenther, O Hogg, T Huberman, BA Xerox Corp Palo Alto Res Ctr Palo Alto CA 94304 USA

ISBN: (纸本)0819427675

A major aim of smart structures is to reduce the amount of materials used to build them while achieving the same amount of dynamic control. This reduction can however lead to a loss of stiffness and a consequent instability of the structure in the presence of stresses. We have turned this problem around by examining how the use of dynamical instabilities can lead to improved control of given patterns in smart structures. In particular, we studied the possibility of dynamically switching between two configurations of a mechanical system, one in which the desired patterns are stable and one in which they are unstable. By comparing the performance of a distributed control in terms of time to switch and power consumption we established that unstable patterns often switch faster among themselves than stable ones without consuming more power.

关键词： distributed control pattern formation multiagent systems

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Optimal finite-element based design of actively controlled smart composite structures under uncertainties

Optimal finite-element based design of actively controlled s...

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SPIE Conference on mathematics and control in smart structures

作者： Orisamolu, IRW Koko, TS Akpan, UO Smith, MJ Martec Ltd Res & Emerging Technol Dept Halifax NS B3J 3J8 Canada

ISBN: (纸本)0819427675

This paper presents a novel integrated formulation and robust computational tool that can be efficiently employed for the design and analysis of actively controlled smart composite structural systems. The modeling simulation capabilities account for the coupling between thermal, mechanical and electric fields within the framework of an integrated structure/control strategy. The paper also reports the formulation and implementation of an optimization capability for the design and tailoring of smart structural systems. Finally, probabilistic and fuzzy models for rationally and systematically accounting for the uncertainties in structural, control, material, and load parameters are presented. The capabilities are packaged in a comprehensive and user-friendly software system (smartCOM) that can be readily applied for cost-effective design or response characterization of actively controlled smart structures.

关键词： optimization fuzzy probabilistic uncertainties finite elements smart structures active control

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Tendon control deployment of tensegrity structures

Tendon control deployment of tensegrity structures

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SPIE Conference on mathematics and control in smart structures

作者： Sultan, C Skelton, RE Purdue Univ Sch Aeronaut & Astronaut W Lafayette IN 47907 USA

ISBN: (纸本)0819427675

In this paper we consider the problem of deployment of tensegrity structures. Our idea is to make use of a certain set of equilibria to which the undeployed and deployed configurations belong. In the state space this set is represented by a connected equilibrium manifold and can be completely characterized analytically. The deployment is conducted such that the deployment trajectory is close to the equilibrium manifold and the deployment time is minimized.

关键词： tensegrity deployable structures time optimal control

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smart structure research at the University of Stuttgart

Smart structure research at the University of Stuttgart

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smart structures and materials 1998 mathematics and control in smart structures

作者： Kröplin, B. Grohmann, B. Konstanzer, P. Inst. of Statics and Dyanamics of AS University of Stuttgart Pfaffenwaldring 27 Stuttgart Germany

The paper gives an outline of a recent research program on smart structures at the University of Stuttgart in which 16 research projects have been combined. The program is expected to last about 10 years. The covered fields range from smart materials and their integration into composites to shape adaptation of aircraft wings, active vibration suppression and noise control. The program is initiated by the university, supported by the German Research Foundation, and designed in coordination to related industrial projects.

关键词： Intelligent structures

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