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检索条件"任意字段=Smart Structures and Materials 1994: Mathematics and Control in Smart Structures"

共 544 条记录，以下是461-470 订阅

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PSEUDO-FAULT INDUCTION AND HARMONIC SUPPRESSION IN ENGINEERING structures

PSEUDO-FAULT INDUCTION AND HARMONIC SUPPRESSION IN ENGINEERI...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： MANSON, G WORDEN, K TOMLINSON, GR UNIV MANCHESTER DEPT ENGNDYNAM & CONTROL RES GRPMANCHESTER M13 9PLLANCSENGLAND

ISBN: (纸本)0819414867

This paper is concerned with the control of responses from linear and nonlinear systems. In the first part, the recently proposed method of pseudo-fault induction is reviewed. It is shown that a linear system can be made to respond to harmonic excitation as if a nonlinearity of given type and location were present. The method makes use of additional or auxiliary excitation. In the second part of the study, the method is extended to cover the introduction of auxiliary inputs into nonlinear systems. A particular application is described, i.e., the suppression of super-harmonic components from sinusoidally excited nonlinear systems. In both cases, the theory is illustrated using results from numerical simulation.

关键词： Complex systems Numerical simulations Fourier transforms Structural engineering Superposition Transform theory Silicon control systems Nonlinear response Roads

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EFFICIENT USE OF INDUCED STRAIN ACTUATORS IN AEROELASTIC ACTIVE control 2

EFFICIENT USE OF INDUCED STRAIN ACTUATORS IN AEROELASTIC ACT...

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2nd European Conference on smart structures and materials

作者： GIURGIUTIU, V CHAUDHRY, Z ROGERS, CA VIRGINIA POLYTECH INST & STATE UNIV BLACKSBURGVA 24061

ISBN: (纸本)0819417009

Consider a stacked actuator of nominal (free-stroke) displacement UISA, and internal stiffness k,. During static operation, the total induced energy, EISA, gets divided between the internal and external subsystems: part of it, Ee, is transmitted to the external application, while the rest, E, remains stored in the internal compressibility of the stack. The value of EISA, and its repartition between Ee and E1, depends on the stiffness ratio r = kik

关键词： Actuators Energy efficiency Dynamical systems Intelligence systems Phase shifts smart materials Mechanics Radium Sun Wave propagation

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smart HYDROGELS IN DEVICES 2

SMART HYDROGELS IN DEVICES

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2nd European Conference on smart structures and materials

作者： GRAHAM, NB UNIV STRATHCLYDE DEPT PURE & APPL CHEMGLASGOW G1 1XWSCOTLAND

ISBN: (纸本)0819417009

Hydrogels are materials which will swell in water but not dissolve. They are a large family of materials rather than a single entity. Indeed much of living tissue comprises hydrogel and the variety and function of this class presents the scope for the development of synthetic materials which can perform many so-called 'smart' functions. The action of muscles, the selectivity of membranes and the contraction and expansion of various sphincters and the control of blood flow in veins and arteries might all be simulated with synthetic analogues. Such materials are now being demonstrated and systems which undergo large dimensional changes with changes in hydrogen ion or other ionic concentration have been reported while hydrogels which bend when subjected to an electrical potential difference have been made. Hydrogels can be incorporated into devices which can act as transducers, as sensors and as accurately controlled timing devices for the release of drugs and in other potential applications. This paper will illustrate a selection of these applications utilizing hydrogels developed in our laboratories and based on crosslinked poly (ethylene oxide). The dry form of the hydrogel will be referred to as a xerogel and the term hydrogel will refer to the material swollen to some degree with water.

关键词： Liquids Oxides Sensors Transducers Arteries Hydrogen Ions smart materials Tissues Veins

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PROGRESS TOWARDS A ROBUST, USER FRIENDLY, SYSTEM FOR ACTIVE STRUCTURAL DAMPING 2

PROGRESS TOWARDS A ROBUST, USER FRIENDLY, SYSTEM FOR ACTIVE ...

引用

2nd European Conference on smart structures and materials

作者： ROBERTS, SSJ BUTLER, RJ DAVIDSON, R UKAEA DIDCOT OX11 0RAOXONENGLAND

ISBN: (纸本)0819417009

This paper details the progress made towards the realization of a robust and user friendly system designed to damp vibration in composite structures. The system relies on polyvinylidene fluoride (PVDF) strain sensors linked to PZT actuators through a simple feedback signal inversion algorithm. The PVDF is coated to reduce charge leakage and the PZT ceramics are encapsulated to provide easy to handle, robust actuators that do not electrically short in CFRP based composites. Details of the system design are presented along with initial results showing vibration control of multimoded CFRP cantilevers.

关键词： Sensors Actuators Ferroelectric materials Ferroelectric polymers Amplifiers Composites Ceramics control systems Feedback signals Semiconducting wafers

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A PDE-based methodology for modeling, parameter estimation and feedback control in structural and structural acoustic systems

A PDE-based methodology for modeling, parameter estimation a...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Banks, H.T. Brown, D.E. Metcalf, Vern L. Silcox, R.J. Smith, R.C. Wang, Yun Center for Research in Scientific Computation North Carolina State University RaleighNC27695 United States Lockheed Engineering and Sciences Company NASA Langley Research Center HamptonVA23681 United States U.S. Army Research Laboratory NASA Langley Research Center HamptonVA23681 United States Acoustics Division NASA Langley Research Center HamptonVA23681 United States Department of Mathematics Iowa State University AmesIA50011 United States

A problem of continued interest concerns the control of vibrations in a flexible structure and the related problem of reducing structure-borne noise in structural acoustic systems. In both cases, piezoceramic patches bonded to the structures have been successfully used as control actuators. Through the application of a controlling voltage, the patches can be used to reduce structural vibrations which in turn leads to methods for reducing structure-borne noise. A PDE-based methodology for modeling, estimating physical parameters, and implementing a feedback control scheme for problems of this type is discussed. While the illustrating example is a circular plate, the methodology is sufficiently general so as to be applicable in a variety of structural and structural acoustic systems. © 1994 SPIE.

关键词： Flexible structures

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Development of a recursive ZAP controller with specific applications in flexible space structures

Development of a recursive ZAP controller with specific appl...

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smart structures and materials 1994: mathematics and control in smart structures

作者： Jakubowski, Amy M. Helferty, John J. Bayard, David S. Department of Electrical Engineering Temple University United States Jet Propulsion Laboratory California Institute of Technology United States

When continuous-time systems are discretized in the digital controller design process, it is often the case that unstable discrete-time zeros (i.e., zeros outside the unit circle in the Z-plane) result regardless of whether or not there are unstable zeros in the original continuous-time plant. Such a system is recognized as being nonminimum phase. Unfortunately, many design techniques in adaptive control are dependent upon pole-zero cancellations and stable plant invertibility and, therefore, cannot be utilized when the plant is nonminimum phase. In this research, a matrix parameter recursive least squares (RLS) adaptation law is developed for the zero annihilator periodic (ZAP) controller first introduced by Bayard[7] and later extended by Jakubowski[8]. This direct adaptive control scheme allows for the construction of an optimal set of matrix controller gains that will place the transmission zeros of the system at the origin, alleviating the nonminimum phase condition, and force the system output to track a desired reference signal. This adaptive ZAP control law has specific applications in nonminimum phase flexible space structures such as the ASTREX facility developed by researchers at Edwards Air Force Base [16]. This flexible structure is a space-based laser that requires the control of three PZT struts that control the traverse bending in two orthogonal planes and one axial direction of a payload. Simulations are presented that demonstrate the performance of the adaptive ZAP controller on a 12-state, 2-input, 2-output partial model of one of the ASTREX struts, where the model of the particular strut exhibits nonminimum phase characteristics. © 1994 SPIE.

关键词： controllers

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Optimized vibration absorbers for structures with non-proportional damping

Optimized vibration absorbers for structures with non-propor...

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smart structures and materials 1994: Passive Damping

作者： Batista, Ronaldo C. Magluta, Carlos COPPE Federal University of Rio de Janeiro C. Postal 68506 CEP 21945 Brazil

Harsh environmental conditions and dynamic loads to which many large civil engineering structures are commonly subjected can promote with time serious damages and material deterioration that can undermine serviceability and safety of the structure its components and appliances. Reduction of vibrations of these structures caused by new and not previously envisaged dynamic loads can be properly achieved by using a robust passive mechanical control system such as simple tuned vibration absorbers (TVA's) which can be easily inspected and maintained, thus being adequate for severe environment. This paper shows that if TVA's are correctly designed they are also very efficient in reducing vibrations of these structures. By taking into account the non-proportional damping introduced in the multi-degree of freedom structural system by the TVA's and by using an optimization technique to calculate their optimum parameters vibrations can be lowered to admissible levels. A practical example of application of light and simple mechanical absorbers to an existing bridge is presented and their performance is demonstrated by experimentally measured dynamic responses. © 1994 SPIE. All rights reserved.

关键词： Dynamic loads

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CHARACTERISATION OF STATIC ACTUATION BEHAVIOUR OF ENCAPSULATED PZT 2

CHARACTERISATION OF STATIC ACTUATION BEHAVIOUR OF ENCAPSULAT...

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2nd European Conference on smart structures and materials

作者： DORAN, CJ BUTLER, RJ DEF RES AGCY FARNBOROUGH GU14 6TDHANTSENGLAND

ISBN: (纸本)0819417009

Within the field of 'smart' structures considerable interest has been shown in the use of piezoelectric materials both as sensors and actuators. One of the best characterized of these materials is the family of Lead Zirconate Titanate (PZT) based ceramics. The use of PZT in intelligent systems has been fairly widespread, the high modulus of the material give high authority actuation, coupled with a wide operational bandwidth and relative ease of control by the application of an applied voltage. The linearity of the actuation response over a limited range has made PZT a popular choice for high precision, relatively low displacement applications. A number of attempts have been made to utilize such actuators for aerospace, using both surface mounting [1] and embedding techniques [2,3]. The effects of actuators on aeroelastic performance has also been investigated for aerospace applications [4,5]. The current practical solution to this problem appears to be the use of spatially distributed actuators [6]. One of the practical limitations of this problem are the large number of actuators required to produce the required degree of static control. In order to ensure accurate shape control, measurements must be taken to ensure there are no significant difference in the actuator element properties due to factors such as batch processing variation. In the past this has proved difficult due to the extremely brittle nature of the actuator material. More specifically the requirement for thinner elements for use in embedded applications has increased this problem. A method by which the static performance of electroceramic actuators could be quickly established would therefore be desirable. This paper presents the results of recent work to develop a test method to define the static electromechanical properties of encapsulated actuator materials in order to assess their suitability as static actuators for aerospace applications. Preliminary results using a standard PZT material are

关键词： Actuators Ferroelectric materials Aerospace engineering Chemical elements Intelligence systems Matrices Ceramics control systems Sensors smart materials

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RECURSIVE ARCHITECTURE FOR LARGE SCALE ADAPTIVE SYSTEM 2

RECURSIVE ARCHITECTURE FOR LARGE SCALE ADAPTIVE SYSTEM

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2nd European Conference on smart structures and materials

作者： HANAHARA, K SUGIYAMA, Y UNIV OSAKA PREFECTURE COLL ENGNDEPT AEROSP ENGNSAKAIOSAKA 593JAPAN

ISBN: (纸本)0819417009

'Large scale' is one of major trends in the research and development of recent engineering, especially in the field of aerospace structural system. This term expresses the large scale of an artifact in general, however, it also implies the large number of the components which make up the artifact in usual. Considering a large scale system which is especially used in remote space or deep-sea, such a system should be adaptive as well as robust by itself, because its control as well as maintenance by human operators are not easy due to the remoteness. An approach to realizing this large scale, adaptive and robust system is to build the system as an assemblage of components which are respectively adaptive by themselves. In this case, the robustness of the system can be achieved by using a large number of such components and suitable adaptation as well as maintenance strategies. Such a system gathers many research's interest and their studies such as decentralized motion control, configurating algorithm and characteristics of structural elements are reported. In this article, a recursive architecture concept is developed and discussed towards the realization of large scale system which consists of a number of uniform adaptive components. We propose an adaptation strategy based on the architecture and its implementation by means of hierarchically connected processing units. The robustness and the restoration from degeneration of the processing unit are also discussed. Two- and three-dimensional adaptive truss structures are conceptually designed based on the recursive architecture.

关键词： control systems Adaptive control Aerospace engineering Space operations Structural design Assembly equipment Nickel smart materials Blood vessels Fractal analysis

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Finite element modeling of three-dimensional integral sensors for the control of aeroelastic structures 2

Finite element modeling of three-dimensional integral sensor...

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2nd European Conference on smart structures and materials 1994

作者： Abdul-Wahed, M.N. Weisshaar, T.A. Faculty of Mechanical Engineering Aleppo University Aleppo Syria School of Aeronautics and Astronautics Purdue University West LafayetteIN47907-1282 United States

For control of structures with aeroelastic loads, torsion and bending must be sensed and controlled independently. Tailored piezoelectrics with skewed sensing axes can provide decoupled sensing of both bending and twist using the same set of sensors. This paper discusses the use of a finite element model to evaluate the effectiveness of anisotropic piezoelectric sensors for shape control sensing. Using a finite element representation for a plate-like structure covered by PVDF laminates, it is shown that integral sensors can accurately capture system independent bending and torsion displacement by measuring the induced electric charges without any additional signal processing efforts. The contribution of this work is to suggest an expression that relates sensed output from anisotropic sensors to plate or lifting surface bending and twist. An expression for the bending and torsion is tested with the finite element model. It is found that bending slope is accurately measured, but that twist is less likely to be accurately approximated by the sensor output. © 1994 SPIE. All rights reserved.

关键词： Torsional stress

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