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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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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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Seismic isolation and passive response-control buildings in Japan

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smart materials & structures 1998年第5期7卷 581-587页

作者： Kitagawa, Y Midorikawa, M Bldg Res Inst Dept Struct Engn Tsukuba Ibaraki 305 Japan Hiroshima Univ Dept Struct Engn Higashihiroshima Hiroshima 739 Japan

This paper presents a brief introduction to seismic isolation and passive structural response-control buildings in Japan. A total number of 287 projects on seismic-isolated building structures had obtained the required special permission in Japan by the end of September 1996. The effectiveness of seismic isolation buildings has been demonstrated and verified through the 1995 Hyogoken-nanbu (Kobe) earthquake. It has resulted in a remarkable increase of the number of projects on seismic isolation buildings. Passive response-control buildings have been constructed in order to reduce the effects from earthquakes and/or wind induced vibration of buildings. One of the lessons learned from the damage due to the 1995 Hyogoken-nanbu earthquake is the importance of developing seismic design concepts to control the damage of buildings within the repairable level during major earthquakes. The passive response-control technology has a high possibility of achieving this goal. The features and trends in seismic isolation and passive response-control buildings in Japan are introduced.

关键词： Intelligent buildings

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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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Force and torque smart tensegrity sensor

Force and torque smart tensegrity sensor

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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

Tensegrity structures represent a special class of tendon space structures, whose members may simultaneously perform the functions of strength, sensing, actuating and feedback control. The paper exploits this advantage, proposing a smart tensegrity sensor for simultaneous measurement of six quantities: three orthogonal forces and three orthogonal moments. The paper shows how the static and dynamic characteristics of the device can be calibrated through pretension and damping adjustment. The external forces and torques of interest are estimated using the measurements provided by selected tendons. A state estimator, based on the linearized model, finalizes the design.

关键词： tensegrity smart sensor Chebyshev polynomials estimation

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Robust intelligent control of structures using piezoceramic materials

Robust intelligent control of structures using piezoceramic ...

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SPIE Conference on mathematics and control in smart structures

作者： Mayhan, P Washington, G Ohio State Univ Intelligent Struct & Syst Lab Columbus OH 43210 USA

ISBN: (纸本)0819427675

The use of smart materials (piezoceramic elements) in structure vibration damping has risen in popularity. The ability to use these materials as both sensors, capturing a voltage upon straining of the material, and actuators, acquiring a displacement due to an electric voltage, has increased The work presented in this paper develops the use of robust intelligent control as applied to smart materials. A steel cantilever beam was constructed as the experimental (physical) plant. Piezoceramic material, lead zirconate titanate (PZT), was surface mounted as both sensors and actuators. The controller was formed using algorithms produced from adaptive fuzzy controls. Fuzzy model reference learning control (FMRLC) is a learning system with the capability to improve its performance over a period of time when various plant uncertainties are introduced. The expected goal of this paper is to dampen the fundamental vibration mode of the beam utilizing the intelligent control algorithm developed. Other controllers, such as positive position feedback (PPF) and direct fuzzy (DF), were developed and compared to the adaptive fuzzy controller. The robustness of the system was also examined when the cantilever beam system properties changed. Extra masses were added to account for the variations of the system parameters. The FMRLC controller showed a dramatic improvement over the PPF and the DF. It is the adaptive nature of the FMRLC that makes the system robust to parameter changes.

关键词： smart structures intelligent control fuzzy logic control piezoceramic vibration damping

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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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