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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411-420 订阅

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ACTIVE VIBRATION SUPPRESSION USING MODULAR ELEMENTS

ACTIVE VIBRATION SUPPRESSION USING MODULAR ELEMENTS

引用

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

作者： BRONOWICKI, A INNIS, J CASTEEL, S DVORSKY, G ALVAREZ, O ROHLEEN, E TRW CO INC DIV SPACE & TECHNOLREDONDO BEACHCA 90278

ISBN: (纸本)0819414859

A system for active suppression of structural vibrations has been developed. The system consists of piezoelectric ceramic actuator and sensor elements which can be either bonded on to or embedded in structural components. For active damping, these are placed at locations of high modal strain energy. For active isolation, locations of high disturbance transmissibility are chosen. Small analog and digital control electronics units have been developed which include all sensing, processing, and actuator drive electronics. The analog unit is appropriate for active damping using strategies such as positive position and integral force feedback. Damping levels in structures has been increased from 0.1% to 100% using a single analog controller. The digital system is capable of executing any algorithm having two inputs and two outputs. Active damping using feedback and active force cancellation using feedforward have been demonstrated. Block diagrams, specifications, photographs, and test results describing the elements of the modular vibration suppression system are presented.

关键词： Analog electronics Actuators Sensors Amplifiers Electronics Microchannel plates Vibration control control systems Ferroelectric materials Bandpass filters

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LOAD LIMITING PARACHUTE INFLATION control

LOAD LIMITING PARACHUTE INFLATION CONTROL

引用

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

作者： REDMOND, J HINNERICHS, T PARKER, G SANDIA NATL LABS ALBUQUERQUENM 87185

ISBN: (纸本)0819414859

Excessive deceleration forces experienced during high speed deployment of parachute systems can cause damage to the payload and the canopy fabric. Conventional reefing lines offer limited relief by temporarily restricting canopy inflation and limiting the peak deceleration load. However, the open-loop control provided by existing reefing devices restrict their use to a specific set of deployment conditions. In this paper, the sensing, processing, and actuation that are characteristic of adaptive structures form the basis of three concepts for active control of parachute inflation. These active control concepts are incorporated into a computer simulation of parachute inflation. Initial investigations indicate that these concepts promise enhanced performance as compared to conventional techniques for a nominal release. Furthermore, the ability of each controller to adapt to off-nominal release conditions is examined.

关键词： Spindles Switches control systems Fourier transforms Modulation Signal processing Computer simulations Device simulation Motion models Feedback control

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POWER-FLOW AND AMPLIFIER DESIGN FOR PIEZOELECTRIC ACTUATORS IN INTELLIGENT structures

POWER-FLOW AND AMPLIFIER DESIGN FOR PIEZOELECTRIC ACTUATORS ...

引用

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

作者： WARKENTIN, DJ CRAWLEY, EF MIT SPACE ENGN RES CTRCAMBRIDGEMA 02139

ISBN: (纸本)0819414859

In developing intelligent structures in which actuation, sensing, and processing elements are physically integrated within the structure, the use of piezoelectric actuators places certain requirements on the electronic components which drive them. Applications may impose strict limitations on power consumption and heat dissipation, and structural integration brings an added requirement for component miniaturization. An understanding of the power flow behavior of piezoelectric actuators in controlled structure applications is therefore important. This paper addresses power issues in the application of piezoelectric actuators and embedded electronic components. The power flow characteristics of piezoelectric actuators are examined in closed-loop control applications. An analysis is presented of the power flow and voltage and current requirements of a piezoelectric actuator in a simple system, along with implications for the design of linear amplifiers. The contributions of various elements to average and peak power flow levels are identified, as is the effect of loop closure on the impedance which the actuator presents to the amplifier.

关键词： Actuators Amplifiers Capacitors Capacitance control systems Electronic components Beam shaping Calcium Piezoelectric effects Resistors

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Electro-mechanical impedance modeling of active material systems

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

引用

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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smart structures WITH SHAPE MEMORY ALLOY ACTUATORS 2

SMART STRUCTURES WITH SHAPE MEMORY ALLOY ACTUATORS

引用

2nd European Conference on smart structures and materials

作者： LAMMERING, R GERMAN AEROSP RES ESTAB INST STRUCT MECHD-38108 BRAUNSCHWEIGGERMANY

ISBN: (纸本)0819417009

The physical basis of shape memory alloy (SMA) behavior is outlined and a general one-dimensional constitutive law is reviewed, which is incorporated into a finite element procedure. A demonstration of two applications is given: a SMA pipe connector and a composite beam with embedded SMA wires. Another example is concerned with the use of SMAs for active control of a magnetic mechanical spring system which is currently under investigation for vibration isolation purposes.

关键词： Shape memory alloys Actuators Composites Chemical elements Magnetism smart structures smart materials Connectors control systems Vibration isolation

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A FUZZY NEURAL-NETWORK-BASED control-SYSTEM FOR ACTIVE DAMPING OF SLEWING structures WITH PIEZOCERAMIC ACTUATORS

A FUZZY NEURAL-NETWORK-BASED CONTROL-SYSTEM FOR ACTIVE DAMPI...

引用

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

作者： ZEINOUN, I KHORRAMI, F POLYTECH INST NEW YORK METROTECH CTRSCH ELECT ENGN & COMP SCICONTROL ROBOT RES LABBROOKLYNNY 11201

ISBN: (纸本)0819414859

This paper presents a control scheme based on fuzzy logic and neural network algorithms and its application to vibration damping of slewing flexible structures with piezoceramic sensors and actuators. In particular, the algorithms are implemented on a flexible-link manipulator. Here, a fuzzy based adaptive controller is considered due to its simplicity and the fact that it does not require expressing the controller in terms of the system parameters, as is necessary in the case of self-tuning regulators. This controller is based on a functional fuzzy model where the consequents are crisp functions of the system states and/or inputs;these functions represent controllers designed for different operating regimes. The premise is constituted by the fuzzy subsets corresponding to the process parameters estimated in real time. The neural network is utilized for two different purposes: 1) derivation of a fuzzy model of the system (fuzzy system identification), 2) derivation of the rule base for the fuzzy logic controller through training. The effectiveness of this new scheme is verified on a clamped-free beam and a flexible-link manipulator instrumented with piezoceramic sensors and actuators. It will be shown that robust performance may be achieved in face of large parameter variations. © 1994 SPIE. All rights reserved.

关键词： controllers

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RESEARCH NEED FOR PIEZOACTUATORS IN ADAPTIVE structures 2

RESEARCH NEED FOR PIEZOACTUATORS IN ADAPTIVE STRUCTURES

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2nd European Conference on smart structures and materials

作者： JANKER, P MARTIN, W DAIMLER BENZ AG RES & TECHNOLD-81663 MUNICHGERMANY

Piezoelectric materials are highly attractive as actuator elements for Adaptive structures since they have material-inherent actuatoric and sensoric functions and can easily be electrically controlled. This paper desc... 详细信息

ISBN: (纸本)0819417009

关键词： Actuators Ceramics Ferroelectric materials Polarization Sensors control systems Crystals Electronics smart materials Chemical elements

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DISTRIBUTED AND DISCRETE TRANSDUCER SPATIAL DESIGN FOR FINITE-ELEMENT-MODELED FLEXIBLE structures

DISTRIBUTED AND DISCRETE TRANSDUCER SPATIAL DESIGN FOR FINIT...

引用

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

作者： MEYER, JE BURKE, SE HUBBARD, JE CHARLES STARK DRAPER LAB INC CAMBRIDGEMA 02139

ISBN: (纸本)0819414859

A modeling technique is presented for transducer spatial design applicable to discrete and distributed transducers with arbitrary one-dimensional shading (spatial gain weighting). The technique accommodates finite element models (FEM) composed of beamlike elements yielding modal displacements and rotations at element node locations. An example is presented: transducer spatial design for a 56-in. by 59-in. nine-bay aluminum grillage. Locations and distributions were chosen in order to shape the system's transducer-augmented forward loop transfer function, making the modal coefficients as large as possible within the eight-mode control bandwidth, and minimizing the coefficients associated with higher frequency modes of vibration. The transducer suite includes accelerometers and the piezoelectric polymer polyvinylidene-fluoride (PVDF) for sensors with lead- zircon-titanate piezoelectric ceramic and PVDF actuators. Modal coefficients employing the three aforementioned techniques are presented showing an average deviation in coefficient magnitude between different methods of calculation of 1.16% over the first 24 modes of vibration.

关键词： Transducers Actuators Sensors Finite element methods Ferroelectric polymers Ferroelectric materials Aluminum Calcium control systems Systems modeling

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PREDICTION OF MODAL RESPONSES FOR OPTIMAL SELECTION OF ACTUATOR POSITIONS IN RECTANGULAR PLATE

PREDICTION OF MODAL RESPONSES FOR OPTIMAL SELECTION OF ACTUA...

引用

Conference on smart materials: smart structures and materials 1994

作者： HONG, SY VARADAN, VV VARADAN, VK Institute for Advanced Engineering (South Korea) The Pennsylvania State Univ. (United States)

ISBN: (纸本)0819414840

Prediction methods for the proper positioning and optimal number of actuators are necessary for efficient structural vibration control. The method proposed can provide ideas on how to select the optimum positions and number of the actuators. Using the coupled mode optimal control algorithm and comparing the control results of each given system, these methods are implemented. As a control structure, an all-clamped thin square plate with proportional damping has been selected. Some possible control algorithms that can be applied to the distributed structural system are discussed. To decide the control gain, a steady-state quadratic optimal control algorithm and discrete-time control system have been used. Since 6 plate modes are considered in the control system, a 12 X 12 matrix form of the system equation can be set up. By changing the impulse and the actuator positions and the number of actuators, a series of mode control simulations have been tried, and on the basis of these results, optimal actuator number and positions can be obtained.

关键词： Actuators control systems Sensors Vibration control Distributed computing Matrices Feedback control Computer simulations Computing systems LCDs

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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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