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检索条件"任意字段=Smart Structures and Materials 2000 - Mathematics and Control in Smart Structures"

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Adaptive processing for non-contact inductive smart structure sensor interrogation system using hierarchical neural networks

Adaptive processing for non-contact inductive smart structur...

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

作者： Spillman, W.B. Durkee, S. Kuhns, W.W. BFGoodrich Aerospace Division Simmonds Precision Aircraft Systems VergennesVT05491 United States

A method of non-contact interrogation of electronic and opto-electronic systems embedded within composite materials has been recently demonstrated. The method is based upon inductive coupling between external and embedded coils etched on thin electronic circuit cards. Measurements at two frequencies allow the coil separation and the value of an electrical parameter of interest to be determined. An investigation into the practicality of utilizing neural processing to calculate these parameters was carried out. The final system utilized a hierarchical architecture of three neural networks combined with an adaptive measurement of voltage at a frequency determined by the coil separation calculated by one of the neural networks. The system was implemented using custom electronics and a PC laptop computer. A description of the design process is given together with system performance parameters. © 1994 SPIE.

关键词： Inductive sensors

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Inductive learning method for control of intelligent structures

Inductive learning method for control of intelligent structu...

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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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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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Distributed parameter system models for damage detection and location in smart material structures

Distributed parameter system models for damage detection and...

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

作者： Banks, H.T. Wang, Yun Center for Research in Scientific Computation North Carolina State University RaleighNC27695-8205 United States

Nondestructive damage detection is an important issue in aging civil engineering, aerospace structures, and several other areas. This study presents an attempt to use parameterized partial differential equations and Galerkin approximation techniques to detect and locate damage. Dynamical analysis is carried out using structure bonded piezoceramic patches as both sensors and actuators. Our presentation will demonstrate the flexibility and accuracy of this approach. It is mode independent and can sense the presence of damage and locate certain damages to a satisfactory precision. As an example, a beam with a pair of piezoceramic patches bonded to it is used as the test structure;several computational examples with holes of different size, shape, and location in the beam are investigated. © 1994 SPIE.

关键词： Damage detection

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A micromechanics model for coated-fiber piezoelectric composites

A micromechanics model for coated-fiber piezoelectric compos...

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

作者： Benveniste, Yakov Department of Solid Mechanics Materials and Structures Faculty of Engineering Tel-Aviv University Ramat-Aviv69978 Israel

A piezocomposite with coated cylindrical fibers of a circular cross section are considered. The fibers are parallel to each other and randomly located in the transverse plane. The Composite Cylinder Assemblage model is adopted and simple formulae are derived for all the effective constants, except for the transverse shear modulus. This last parameter is estimated by a mean field theory approximation. © 1994 SPIE.

关键词： Mean field theory

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Vibration suppression of a flexible manipulating system by using transfer matrix method

Vibration suppression of a flexible manipulating system by u...

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

作者： Shen, Ji Yao Sharpe, Lonnie He, Zhong Q. Keckler, Claude R. Dept. of Mechanical Engineering School of Engineering North Carolina A and T State University GreensboroNC27411 United States Control and Guidance Division NASA Langley Research Center HamptonVA23681 United States

The modeling and control of manipulating systems with rigid-body links have been successfully developed within the robotics literature. The investigation of manipulating system with joint compliance and link flexibility has been also studied by some researchers. In general, the methods applied the 4 by 4 homogeneous transformation matrices of Devanit and Hartenberg. The generalized coordinates associated with the link degree of freedom and flexible modal coordinates were selected to describe the kinematics and dynamic behavior of the manipulating system. The Lagrange's equation was then used to obtain a large set of nonlinear partial differential equations. The expansion and solution of the equations are tedious. The method presented thus far in the literature were all very complicated. To simplify the analytical process, this paper models a two-arm flexible manipulating system by a set of generic partial differential equations, from which the transfer matrices for the flexible arms and revolute joints have been constructed. Based upon the compatibility conditions at the connecting points, the global system dynamic equation has been derived. Joint moments are used as the control actions. A typical control problem for end-effector vibration suppression has been investigated. control law computation proceeds in the frequency domain based on the pole-placement method. The effectiveness of the vibration suppression by using distributed parameter modeling technique along with the application of transfer matrix method is indicated by means of the decay of the end-effector response time history computed based upon the modal expansion method. © 1994 SPIE.

关键词： End effectors

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Electro-mechanical impedance modeling of active material systems

Electro-mechanical impedance modeling of active material sys...

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

作者： Liang, Chen Sun, Fanping Rogers, Craig A. Center for Intelligent Material Systems and Structures Virginia Polytechnic Institute State University BlacksburgVA24061-0261 United States

An active material system may be generalized as an electro-mechanical network because of the incorporation of the actuators (electrically driven) and sensors (that convert mechanical energy into electrical energy). An investigation of the coupled electrical and mechanical aspects of an active material system will help to reveal some of its most important characteristics, in particular, the energy conversion and consumption issues. This paper summarizes most of our research in the area of the electro-mechanical impedance (EMI) modeling of active material systems. In this paper, a generic electro-mechanical impedance model to describe the electro-mechanical network behavior (time domain and frequency domain) of active material systems will be discussed. The focus of the discussion will be on the methodology and basic components of the EMI modeling technique and its application to assist in the design of efficient active control structures. This paper will first introduce the basic concept of the electro-mechanical impedance modeling and its general utilities in the area of active material systems. The methodology of the EMI modeling technique will be illustrated using an example of PZT actuator-driven mechanical systems. The basic components in the EMI modeling, including the electro-mechanics of induced strain actuators, the dynamic analysis of active material systems, and the electrical power consumption and requirements, will be discussed. Finally, some applications of the EMI modeling approach, including the determination of the optimal actuator locations;modal analysis using collocated PZT actuator/sensors;and the prediction of radiated acoustic power, will be presented. © 1994 SPIE.

关键词： Modal analysis

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An efficient mathematical model for interfaces between the host structure and smart devices

An efficient mathematical model for interfaces between the h...

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

作者： Allaei, Daryoush QRDC Inc. P.O. Box 562 ExcelsiorMN55331-0562 United States Sound and Vibration Engineering Technology Program HTC HutchinsonMN United States

Accurate and efficient modeling of interfaces between structural components has always been an important concern in the field of vibration analysis. In particular, to actively and intelligently control the elastic motions of structures, smart devices (sensors and actuators) need to be attached to or embedded in structural components. In this article an effective semi-numerical approach for mathematical modeling of interfaces between the host structure and smart devices is proposed. The model is based on the component-mode syntheses via receptance method which is most suitable for vibration analysis and control. By utilizing the receptance method, large mass and stiffness matrices of the conventional finite element models are replaced by natural frequencies and mode shapes of the host structure and those of the attached or embedded elements. Three types of interfaces are investigated: point, line, and surface interfaces. Contrary to conventional methods, the line and surfaces are modeled as actual lines and surfaces rather than a finite number of points. The latter, drastically reduces the degrees of freedom and significantly improves the accuracy of the numerical values. Finally, such formulation results in a huge reduction in the size of the model and tremendous gain in computational speed. © 1994 SPIE.

关键词： Vibration analysis

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A time domain analysis of active control of sound transmission through an elastic plate backed by a rigid rectangular cavity

A time domain analysis of active control of sound transmissi...

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

作者： Koshigoe, Shozo Ellis, Graham K. Aerospace Corporation P.O. Box 92957 M4/967 Los AngelesCA90009-2957 United States

A time domain model for simulating the noise transmission through an elastic plate into a rigid cavity has been developed. This model is used to study the noise attenuation capability and transient-convergence of the filtered-x LMS feedforward control algorithm. Piezoelectric transducers (PZT's) are considered to be bonded on the elastic plate and are used as actuators in the control scheme. In this study, the fully coupled acoustic-plate interaction equations are solved using time dependent Green's function techniques, where a time varying air mean density is considered. The effects that the time varying mean density has on the transmission of sound and on the stability of the filtered-x LMS adaptive controller are discussed. © 1994 SPIE.

关键词： Time domain analysis

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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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