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

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smart STRUCTURE DAMPING MODELING

SMART STRUCTURE DAMPING MODELING

引用

33rd IEEE Conference on Decision and control

作者： ZHANG, W LIN, F GM CORP GM TECH CTRTROYMI 48084

ISBN: (纸本)0780319680

Damping mechanisms exist in all vibration systems in general, and in smart structures in particular, but their nature is little understood and there is no systematic method for modeling general damping. This paper describes a novel damping modeling method (the Method of Energy Approximation, or MEA). This method is novel because it is A unique damping modeling method without assumed damping linearity Based on experimental data instead of physical principles;hence it is applicable to smart structures of various materials and geometries Suitable for smart structure transient control, which is a critical issue in smart structures Among the three quantities essential to an understanding of the dynamics of smart structures, mass, stiffness and damping, the last is the most complex and least understood. Therefore, with recent technology advances in smart materials and smart structures, the need for a good damping modeling method is more urgent than ever.

关键词： Damping

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Inductive learning method for control of intelligent structures

Inductive learning method for control of intelligent structu...

引用

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

作者： Pascoe, James W. Robertshaw, Harry H. Kiel, David H. Department of Mechanical Engineering Center for Intelligent Materials Systems and Structures Virginia Polytechnic Institute State University BlacksburgVA24061 United States SIECOR Corporation P.O. Box 489 HickoryNC28603-0489 United States

An inductive learning method is used for online control of a structure. The controller has the benefit of being designed without the need for a system model and is able to adapt to varying system parameters. The learning method is empirical in nature where the trials and errors of the controller generate a stimulus-response function which is used to improve the performance of the system. Numerical experiments were performed with the Quantized Inductive Learning (QIL) algorithm on simple linear systems and a simulation of a simply supported aluminum beam. In both cases, the algorithm controlled the dynamic response of the system from an arbitrary initial condition. The QIL algorithm learned the control function without access to the computer model. Other issues associated with the development of this algorithm were examined concurrently. The effects of various performance indices, varying the sampling periods, and changing the levels of quantizations were determined and evaluated. In addition, QIL was used to reject sinusoidal disturbances on these systems. Finally a comparison of the QIL algorithm with state feedback was made to compare the effectiveness of this method with a standard model-based approach. © 1994 SPIE.

关键词： controllers

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ELECTRORHEOLOGICAL ADAPTIVE structures WITH EMBEDDED SENSING AND control

ELECTRORHEOLOGICAL ADAPTIVE STRUCTURES WITH EMBEDDED SENSING...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： HAN, L VOLOSHIN, A YALCINTAS, M COULTER, J LEHIGH UNIV DEPT MECH ENGN & MECHBETHLEHEMPA 18015

ISBN: (纸本)0819414859

Interferometric fiberoptic sensor (FOS) is immune from electromagnetic influence and provides a useful tool for vibration monitoring. In this paper, some problems associated with the vibration sensing for structures are analyzed. A phase drift model was developed and used to investigate the experimental phenomena occurring at the test. This simpler method was utilized to detect the exciting frequency without complicated signal demodulation. The obtained FOS was used to control the vibration of the structure subjected to a random external excitation.

关键词： Fiber optics sensors Interferometry Sensors Structural sensing Electromagnetism Bessel functions Fiber optics Polarimetry smart structures Vibration control

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OPEN-LOOP control OF A CIRCULAR RING SUBJECTED TO MECHANICAL AND THERMAL EXCITATIONS

OPEN-LOOP CONTROL OF A CIRCULAR RING SUBJECTED TO MECHANICAL...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： TZOU, HS HOWARD, RV UNIV KENTUCKY DEPT MECH ENGNLEXINGTONKY 40506

ISBN: (纸本)0819414859

Distributed control of elastic continua using distributed piezoelectric actuators posts a problem when the environmental temperature also changes in time. In this paper, an open-loop distributed control of a circular ring subjected to combined mechanical and thermal excitations is studied. One electric charge is tuned to control the mechanical excitation, and the other to compensate the temperature induced oscillation. control effectiveness is evaluated.

关键词： Temperature metrology Ferroelectric polymers control systems Feedback control Actuators Calcium Polymers Thermal effects Vibration control Vibrometry

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NONLINEAR FINITE-ELEMENT SCHEME FOR MODELING THE MAGNETOELASTIC RESPONSE OF MAGNETOSTRICTIVE smart structures

NONLINEAR FINITE-ELEMENT SCHEME FOR MODELING THE MAGNETOELAS...

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smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： KANNAN, KS DASGUPTA, A UNIV MARYLAND DEPT MAT & NUCL ENGNCOLLEGE PKMD 20742

ISBN: (纸本)0819414859

A variational statement of the nonlinear boundary value problem of magneto-mechanical interactions in magnetostrictive materials is presented. Some of the complexities arising out of the nature of these interactions are pointed out. A finite element code developed on the basis of a linearized version of the above variational statement is used to model the behavior of an idealized magnetostrictive actuator. The strong influence of coupling constants on the induced magnetic field is demonstrated through our coupled finite element analysis. Errors that are possible in uncoupled analyses are illustrated and the need for fully coupled analyses of general two or three dimensional actuator configurations is brought out.

关键词： Magnetism Actuators Magnetostrictive materials Error analysis Matrices smart structures 3D modeling Chemical elements Finite element methods Differential equations

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DISTRIBUTED ADAPTIVE-control OF FLEXIBLE structures

DISTRIBUTED ADAPTIVE-CONTROL OF FLEXIBLE STRUCTURES

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： PAJUNEN, GA NEELAKANTA, PS GOPINATHAN, M AROCKIASAMY, M FLORIDA ATLANTIC UNIV DEPT ELECT ENGNBOCA RATONFL 33431

ISBN: (纸本)0819414859

In this paper a new method of distributed parameter control of flexible structures is considered. It is based on finite element approximation, from which the auto-regressive moving average representation of the distributed parameter system is derived. First, a discrete-time recursive least squares estimation algorithm is designed to estimate mass, stiffness and damping coefficient of the structure. It is then combined with a continuous time linear quadratic regulator algorithm, to form a hybrid distributed adaptive control system for the suppression of vibration in flexible structures. Simulation results are furnished to demonstrate the performance of the estimation algorithm and the adaptive controller.

关键词： Adaptive control control systems Matrices Computer simulations Device simulation Distributed computing Feedback control Sensors control systems design Optical simulations

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ADAPTIVE VIBRATIONAL control OF ROTATING HELICOPTER BLADES CARRYING A TIP MASS

ADAPTIVE VIBRATIONAL CONTROL OF ROTATING HELICOPTER BLADES C...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： SONG, O LIBRESCU, L VIRGINIA POLYTECH INST & STATE UNIV DEPT ENGN SCI & MECHBLACKSBURGVA 24061

ISBN: (纸本)0819414859

An integrated distributed actuator design methodology based upon the converse piezoelectric effect and aimed at actively controlling the in-vacuo flapping and lagging eigenvibration characteristics of rotating blades carrying a tip mass is presented. The system of piezoelectric actuators bonded or embedded into the structure produces a localized strain field in response to an applied voltage, and as a result, an adaptive change of dynamic response characteristics is generated. The helicopter blade is modeled as a thin/thick-walled closed cross- section untwisted cantilevered beam rotating with constant angular velocity. The considered numerical illustrations reveal the power of the adaptive technology to control the dynamic characteristics of rotating blade structures and, as a result, to avoid their structural resonance as well as any of their dynamic instabilities.

关键词： Actuators Adaptive control Anisotropy Piezoelectric effects Vibration control Composites Dielectric polarization Motion models Mechanics smart materials

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Manipulations of dynamic response data for use in inductive learning methods to identify damage

Manipulations of dynamic response data for use in inductive ...

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

作者： Tappert, Peter M. Robertshaw, Harry H. Department of Mechanical Engineering Center for Intelligent Materials Systems and Structures Virginia Polytechnic Institute State University BlacksburgVA24061 United States

Various dynamic response data manipulations are presented as part of the ongoing process of developing a complete, model-independent, inductive learning, damage identification method. Dynamic response data, which consist of spatial and temporal information, are verified to be dependent on changes in physical properties of a structure (i.e. mass, stiffness, damping, damage). Simulated experiments were performed on a 500mm X 600mm X 3mm steel plate with simply-supported boundary conditions. As a method to test the procedure, a point mass was added to the model in various locations of the structure. Using an array of sensors and a piezoelectric actuator, impulse-response functions and frequency-response functions were determined for the entire domain of sensor-actuator pairs. These impulse-response functions and frequency response functions of different sensor-actuator pairs were input into an inductive algorithm. Inductive learning methods require definitions of a dependent variable, independent variables, and specific examples. Using piecewise manipulations of the forementioned functions and repeated data acquisition (to take into random transduction errors), these definitions were specified. An automated damage identification method incorporating the use of inductive learning is presented and shown to be successful. © 1994 SPIE.

关键词： Frequency response

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smart AERODYNAMIC control SURFACE ACTUATOR

SMART AERODYNAMIC CONTROL SURFACE ACTUATOR

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： GRIFFIN, S HANAGUD, SV GEORGIA INST TECHNOL DEPT AEROSP ENGNATLANTAGA 30332

ISBN: (纸本)0819414859

Integral control surfaces in rear sections of airfoils can be used to actively control camber. This has potential applications in individual blade cyclic control of helicopters and in aeroelastic control of fixed-wing aircraft. When analyzed as actuators, integral control surfaces will have a characteristically misbehaved frequency response function (FRF). Taking tip displacement as a result of a force input, one would expect either highly peaked resonances characteristic of such a substructure or large areas of very low response depending on what part of the frequency domain the observation is made. In this paper, active control is used locally to convert the FRF of a proposed integral actuator into a more favorable flat-gain FRF in a frequency range of interest. This is accomplished while still exploiting at least some of the gain of the open loop first structural resonance. Both experiment and analysis are presented.

关键词： Actuators Bandpass filters Linear filtering Aerodynamics Composites Curium Feedback control Ferroelectric materials Sensors Signal analyzers

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OVERVIEW OF smart STRUCTURE CONCEPTS FOR HELICOPTER ROTOR control 2

OVERVIEW OF SMART STRUCTURE CONCEPTS FOR HELICOPTER ROTOR CO...

引用

2nd European Conference on smart structures and materials

作者： NARKIEWICZ, JP CITY UNIV LONDON LONDON EC1V 0HBENGLAND

ISBN: (纸本)0819417009

The crucial components on which helicopter performance and handling qualities depend are the main and tail rotors, which are also strong contributors to the noise and vibration levels. Improvement of these elements leads to an enhancement of the overall rotorcraft quality. In this paper the aspect of smart structures applications chosen for consideration is that of control design concepts, leaving aside the areas of materials, sensor/actuators design, control algorithms, etc. Various design concepts of helicopter rotor control currently under consideration are reviewed, thereby indicating that rotorcraft technology is an area in which research into the application of smart structures may lead to significant improvements.

关键词： smart structures Aerodynamics control systems smart materials Actuators Shape memory alloys Sensors Reliability Turbulence Head

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