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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421-430 订阅

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FAULT DETECTION EMPLOYING TRANSDUCER OPTIMISATION PROCEDURES 2

FAULT DETECTION EMPLOYING TRANSDUCER OPTIMISATION PROCEDURES

引用

2nd European Conference on smart structures and materials

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

ISBN: (纸本)0819417009

This paper describes one possible way forward for smart structures in the domain of fault detection and classification using neural networks and genetic algorithms. Consideration is given to the incompatibility between numerical training data sets and real structures and how this may be ameliorated using optimization procedures for determining the number and location of transducers required to locate and classify a fault.

关键词： Sensors Transducers Neural networks Genetic algorithms Data modeling Diagnostics smart materials Chemical elements Detection and tracking algorithms smart structures

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INVESTIGATION OF STRAIN TRANSFER IN A smart STRUCTURE ADHESIVE JOINT

INVESTIGATION OF STRAIN TRANSFER IN A SMART STRUCTURE ADHESI...

引用

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

作者： ONDERS, JP NAGANATHAN, NG UNIV TOLEDO DEPT MECH ENGNTOLEDOOH 43606

ISBN: (纸本)0819414859

The ability of the adhesive in a piezoceramic actuator to effectively transfer strain between the ceramic and the metal structure is critical as piezoceramics become popular as elements in mechanical actuators. As motion requirements increase, the strain transfer must be maximized from the ceramic to the metal. The objective of this work is to develop guidelines for designing metal-ceramic actuator systems using piezoceramic motor elements. Both analytical and experimental methods were employed to investigate strain transfer between the piezoceramic element and the metal. Taguchi methods were used to select optimum adhesive and base metal combinations. Following these optimum parameters, single-layer piezoceramic elements were bonded to cantilevered beams to investigate the strain transfer from an actuator to a beam. An existing analytical model of the bond layer was modified for use with the metal-ceramic actuators being tested. The strain and deflection predicted by this model were compared to the experimental results. © 1994 SPIE. All rights reserved.

关键词： Mechanical actuators

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ACTIVE NOISE-control USING PIEZOELECTRIC ACTUATOR FOR A MACHINE

ACTIVE NOISE-CONTROL USING PIEZOELECTRIC ACTUATOR FOR A MACH...

引用

Conference on smart materials: smart structures and materials 1994

作者： BAO, XQ OUNAIES, Z VARADAN, VK VARADAN, VV PENN STATE UNIV CTR ENGN ELECTR & ACOUST MATDEPT ENGN SCI & MECHUNIV PKPA 16802

ISBN: (纸本)0819414840

The use of active noise control applied to an industrial machine is investigated. The control system consists of an analog controller, an optical synchronous sensor, an error microphone, and an actuator. The signal from the optical sensor, which is synchronized with the impacts, is compensated by the controller and then sent to the actuator. The controller automatically adjusts itself according to the error signal to get maximum noise reduction. Instead of the more traditional loudspeakers used in noise control systems, a piezoelectric actuator is developed to work in a harsh industrial environment. The actuator is basically a bending mode vibrator made of aluminum and PZT (lead zirconate titanate) plates and is able to work in the frequency range of interest. A computer program based on the finite element approach was developed to aid the design of the actuator. The predicted output and the measured one agree very well. The system is tested in a laboratory setup by replaying the noise recorded from the machine. A reduction of 10 dB(A) is achieved.

关键词： Actuators Sensors Ferroelectric materials control systems Aluminum Analog electronics Optical sensors Phase shifts Interference (communication) Software

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DISSIPATED ENERGY AS THE MEANS FOR HEALTH MONITORING OF smart structures

DISSIPATED ENERGY AS THE MEANS FOR HEALTH MONITORING OF SMAR...

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Conference on smart Sensing, Processing, and Instrumentation

作者： MAST, PW MICHOPOULOS, JG BADALIANCE, R CHASKELIS, H USN RES LABDIV MAT SCI & TECHNOLMECH MAT BRANCHWASHINGTONDC 20375

ISBN: (纸本)0819414867

NRL's Mechanics of materials Branch has developed the Embedded Sensors for smart structures Simulator (ES) design tool which relates the output of a finite number of sensors to strain induced structural damage. This tool is based on the use of the dissipative part of the bulk nonlinear material behavior. The methodology used to identify this behavior has evolved at NRL over the past 20 years. This paper describes the role of strain measurements and their relation to sensor type and location, the conceptual framework of dissipated energy density as the metric employed for assessing material/structure performance, the facilities provided by the simulator and their use, as well as implementation details. Through this we hope not only to make designing and verifying embedded sensor layouts on composite material structures a tractable task, but also to promote the use of dissipated energy density as a foundation upon which to build an effective means of measuring material and structural health. 13

关键词： Sensors Composites Sensor networks Calibration smart structures Computer simulations Sensor calibration Complex systems Mechanics Tolerancing

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POTENTIALS AND PROBLEMS IN SPACE APPLICATIONS OF smart structures TECHNOLOGY 2

POTENTIALS AND PROBLEMS IN SPACE APPLICATIONS OF SMART STRUC...

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2nd European Conference on smart structures and materials

作者： EATON, DCG BASHFORD, DP ESTEC ESANOORDWIJKNETHERLANDS

ISBN: (纸本)0819417009

The well known addage 'don't run before you can walk emerging materials. It typically takes ten years before a material is sufficiently well characterized for commercial aerospace application. Much has to be learnt not only about the material properties and their susceptibility to the effects of their working environment but also about the manufacturing process and the most effective configuration related application. No project will accept a product which has no proven reliability and attractive cost effectiveness in its application. The writers firmly believe that smart structures and their related technologies must follow a similar development pattern. Indeed, faced with a range of interdisciplinary problems it seems likely that 'partially smart' techniques may well be the first applications. These will place emphasis on the more readily realizable features for any structural application. Prior use may well have been achieved in other engineering sectors. Because ground based applications are more readily accessible to check and maintain, these are generally the front runners of smart technology usage. Nevertheless, there is a strong potential for the use of smart techniques in space applications if their capabilities can be advantageously introduced when compared with traditional solutions. This paper endeavors to give a critical appraisal of the possibilities and the accompanying problems. A sample overview of related developing space technology is included. The reader is also referred to chapters 90 to 94 in ESA's Structural materials Handbook (ESA PSS 03 203, issue 1.). It is envisaged that future space applications may include the realization and maintenance of large deployable reflector profiles, the dimensional stability of optical payloads, active noise and vibration control and in orbit health monitoring and control for largely unmanned spacecraft. The possibility of monitoring the health of items such as large cryogenic fuel tanks is a typical longer te

关键词： smart structures Space operations Antennas Actuators Aerospace engineering Reflectors Transducers control systems Sensors Vibration control

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ACTIVE ABSORPTION OF ACOUSTIC-WAVE USING STATE-SPACE control APPROACH

ACTIVE ABSORPTION OF ACOUSTIC-WAVE USING STATE-SPACE CONTROL...

引用

Conference on smart materials: smart structures and materials 1994

作者： WU, Z VARADAN, VK VARADAN, VV LEE, KY PENN STATE UNIV DEPT ENGN SCI & MECHCEEAMUNIV PKPA 16802

ISBN: (纸本)0819414840

This paper presents a computer modeling and simulation of an active sound absorbing system with an optimal state-feedback controller. First, a state-space model is developed to describe one-dimensional sound reflection and transmission in the time domain. In the model derivation, the difficulty of discretizing the wave equation in an unbounded region is overcome by combining the finite-difference and analytical solutions. Numerical simulation of the open- loop model response is performed, which shows a good agreement with the well known frequency domain solutions. Second, a state-feedback controller including a linear quadratic regulator and a Kalman filter type state-estimator is designed using the optimal control theory. Numerical simulation of the closed-loop model response of an active sound control system containing two sensors and one actuator is presented. It is shown that a broadband attenuation of more than 30 dB over 2 octaves has been reached.

关键词： control systems Acoustics Absorption Sensors Feedback control Actuators Systems modeling Computer simulations Error analysis Reflection

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ACTIVE DAMPING control SYSTEMS FOR SATELLITES 2

ACTIVE DAMPING CONTROL SYSTEMS FOR SATELLITES

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2nd European Conference on smart structures and materials

作者： PIETSCH, CR BAIER, H DORNIER GMBH WERKE D-88039 FRIEDRICHSHAFENGERMANY

The potential of Active Damping control Systems (ADCS) is demonstrated for several satellite applications where active control of satellite disturbances is required. Test results of damping large satellite appendages ... 详细信息

ISBN: (纸本)0819417009

关键词： Satellites control systems Surface plasmons Optical communications Actuators Sensors smart materials Telecommunications Satellite communications Space operations

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REMOTELY INTERROGATED SENSOR ELECTRONICS (RISE) FOR smart structures APPLICATIONS 2

REMOTELY INTERROGATED SENSOR ELECTRONICS (RISE) FOR SMART ST...

引用

2nd European Conference on smart structures and materials

作者： SPILLMAN, WB DURKEE, S KUHNS, WW BFGOODRICH AEROSP SIMMONDS PRECIS AIRCRAFT SYSTVERGENNESVT 05491

ISBN: (纸本)0819417009

smart structures research has focussed upon the many different subsystems making up the smart structure with the exception of the power/communication interface. In the case of embedded fiber optic sensors, an acceptable solution has yet to be found. A preferred solution would not involve physical interconnection between the power/interrogation subsystem and any embedded electronics. One method which offers promise to provide this solution is based upon inductive coupling between a surface mounted interrogation coil and an embedded coil connected to some local system. In this paper, a description of such a system is provided detailing its basic operating principles, the design/performance of a pc based demonstration system, results from sensors embedded in composite coupons and a discussion of how the system may properly be called a smart subsystem.

关键词： Sensors smart structures Resistance Electronics Epoxies Composites Glasses Inductive coupling Remote sensing control systems

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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...

引用

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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DEVELOPMENT OF AN ACTUATOR POWER-FACTOR METER FOR EXPERIMENTAL-DETERMINATION OF THE OPTIMAL ACTUATOR LOCATION ON COMPLEX structures

DEVELOPMENT OF AN ACTUATOR POWER-FACTOR METER FOR EXPERIMENT...

引用

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

作者： LIANG, C SUN, FP ROGERS, CA VIRGINIA POLYTECH INST & STATE UNIV CTR INTELLIGENT MAT SYST & STRUCTBLACKSBURGVA 24061

ISBN: (纸本)0819414859

Actuator power factor, defined as the ratio of structural dissipative mechanical power to apparent supplied electrical power, describes the effectiveness of the integrated actuators to convert supplied electrical power to mechanical power which creates the intended structural response. A large actuator power factor in the frequency range of application indicates that the corresponding actuator (position) has a higher authority to excite its host structure in that frequency range than positions with a lower power factor. The use of acutator power factor provides an alternate tool in the determination of the optimal actuator locations and dimensions to theoretical calculations. More importantly, the power factor can be experimentally measured on large-scale complex structures, thereby eliminating the need for sophisticated theoretical modeling. The concept of an actuator power factor was first introduced by the authors (Liang et al., 1993a) and will be briefly described herein. The utility of using the actuator power factor in optimizing an actuator system will then be illustrated using a numerical case study. The hardware development of the actuator power factor meter will be presented. The application of actuator power factor meter for optimal experimental actuator placement will be discussed.

关键词： Actuators Ferroelectric materials Dielectrics Acoustics Active vibration control Signal attenuation Algorithm development Aluminum Linear filtering Sun

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