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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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PARTICLE-SIZE EFFECTS IN THE ELECTRORHEOLOGICAL BEHAVIOR OF SILICA-POLY(DIMETHYLSILOXANE) MIXTURES

PARTICLE-SIZE EFFECTS IN THE ELECTRORHEOLOGICAL BEHAVIOR OF ...

引用

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

作者： COUGHLIN, CS CAPPS, RN USN RES LABUNDERWATER SOUND REF DETACHMENTORLANDOFL 32822

ISBN: (纸本)0819414859

Electrorheological (ER) fluids are typically nonaqueous suspensions that show a reversible viscosity increase upon application of an external electric field. There has been some important basic work on the stress-transfer mechanisms in ER fluids but little work on actual particle size effects. Several ER fluids were characterized with a modified Brookfield viscometer; field strengths up to about 0.5 kV/mm may be employed with this setup. The ER fluids consisted of various synthetic precipitated and fumed silicas suspended in a 50-cStk. or 200- cStk. silicone oil at levels up to 9% by weight. Apparent viscosity and shear stress were measured as a function of shear rate and field strength employing several silicas with different primary particle size and composition. The data show a dependence of primary and agglomerated particle sizes on the electrorheological behavior. However, all of the data for these three systems could be combined onto one scaling plot of relative viscosity versus Mason number, Mn. The crossover from electrostatic to hydrodynamic control for the stress transfer in these systems occurred at a Mn of 1.5. A fumed silica with a smaller primary particle size, and no significant agglomeration was also examined. It showed similar behavior to the previous silicas.

关键词： Silica Particles Manganese Silicon control systems Spindles Intelligence systems Analytical research Dielectrics smart structures

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ENGINEERING FEASIBILITY OF INDUCED STRAIN ACTUATORS FOR ROTOR BLADE ACTIVE VIBRATION control

ENGINEERING FEASIBILITY OF INDUCED STRAIN ACTUATORS FOR ROTO...

引用

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

作者： GIURGIUTIU, V CHAUDHRY, Z ROGERS, CA VIRGINIA POLYTECH INST & STATE UNIV CTR INTELLIGENT MAT SYST & STRUCTBLACKSBURGVA 24061

ISBN: (纸本)0819414859

Rotor blade vibration reduction based on higher harmonic control - individual blade control (HHC-IBC) principles is presented as a possible area of application of induced strain actuator (ISA). Recent theoretical and experimental work on achieving HHC-IBC through conventional and ISA means is reviewed. Though the force- displacement and power-energy estimates vary significantly, some common-base values are identified. Hence, a benchmark specification for a tentative HHC-IBC device based on the aerodynamic servo-flap principle operated through ISA means is developed. Values for the invariant quantities of energy, power, and force-displacement product are identified, along with actual displacement and force values of practical interest. The implementation feasibility of this specification into an actual ISA device is then discussed. It is shown that direct actuation is not feasible due to the large required length of the ISA device, resulting in excessive compressibility effects (displacement loss and parasitic strain energy). Indirect actuation through a displacement amplifier was found to be more feasible, since it allows for matching the internal and external stiffness. A closed-form formula was developed for finding the optimal amplification gain for each required value of the closed- loop amplification ratio. Preliminary studies based on force, stroke, energy, and output power requirements show that available ISA stacks coupled with an optimally designed displacement amplifier might meet the benchmark specifications.

关键词： Actuators Aerodynamics Ferroelectric materials control systems Vibration control Amplifiers Energy efficiency Active vibration control Composites Modulation

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BRAGG INTRA-GRATING SENSING - IMPLICATIONS FOR smart structures

BRAGG INTRA-GRATING SENSING - IMPLICATIONS FOR SMART STRUCTU...

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Conference on smart Sensing, Processing, and Instrumentation

作者： MEASURES, RM HUANG, S LEBLANC, M OHN, M ALAVIE, AT UNIV TORONTO INST AEROSP STUDIESFIBER OPT SMART STRUCT LABDOWNSVIEWONCANADA

ISBN: (纸本)0819414867

Intracore fiber optic Bragg gratings have many attractive features that make them well suited for smart structures. The Bragg grating laser sensor makes optimum use of the optical energy and a 4-channel system has recently been demonstrated in connection with a fiber optic sensing system installed in a new highway bridge. In this paper we introduce the new concept of Bragg `intra-grating' sensing whereby additional sensing information from within the grating can be extracted. We show theoretically that the presence of a strain gradient across a Bragg grating distorts its reflection spectrum and have verified this with a preliminary experiment. We also show that debonding of the Bragg grating from its host structure can be detected by changes in the reflection spectrum providing a warning of sensor malfunction.

关键词： Fiber Bragg gratings Sensors Fiber optics Fiber optics sensors smart structures Fiber lasers Modulation Bridges Refraction Light emitting diodes

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COMBINED SENSOR SYSTEM FOR PROCESS AND IN-SERVICE HEALTH MONITORING OF COMPOSITE structures

COMBINED SENSOR SYSTEM FOR PROCESS AND IN-SERVICE HEALTH MON...

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Conference on smart Sensing, Processing, and Instrumentation

作者： LOU, KA ZIMMERMANN, B YANIV, G SIMULA GOVT PROD INC RES & DEVPHOENIXAZ 85044

ISBN: (纸本)0819414867

Advanced composite materials have evolved to be the class of materials which meet the strict requirements of many ground- and space-based critical structures. structures that incorporate these novel materials are frequently exposed to harsh environments during service and must be manufactured using high quality standards. Not only is it desirable to monitor and control the fabrication process of these materials using embedded sensors, but it is also necessary to instrument these structures with devices that allow in-service health monitoring. This paper describes an approach which integrates an optical fiber time domain strain and temperature monitoring network with a fiber optic cure monitoring system for composite materials. The proof-of-concept tests consisted of fabricating a thermoset composite laminate that combined a multi-segment optical fiber sensor network, monitored the state of cure during the fabrication of the laminate, and determined strain and temperature during tests performed after fabrication. Software was written to interface a commercially available optical time domain reflectometer system to a personal computer.

关键词： Sensors Composites Reflectors Temperature sensors Temperature metrology Optical fibers Fiber optics sensors Optical fabrication Process control Optical components

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SHAPE control OF AN ADAPTIVE COMPOSITE REFLECTOR PANEL 2

SHAPE CONTROL OF AN ADAPTIVE COMPOSITE REFLECTOR PANEL

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2nd European Conference on smart structures and materials

作者： PARADIES, R ELSPASS, WJ SCHINDLER, K SWISS FED INST TECHNOL INST DESIGN & CONSTRUCT METHODSCH-8092 ZURICHSWITZERLAND

This paper describes a manufacturing technique for active structures and a displacement measurement concept based on an embedded sensor system, which can both be used for the design of future active fibre reinforced r... 详细信息

ISBN: (纸本)0819417009

关键词： Reflection

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GUIDELINES FOR smart STRUCTURAL HEALTH MONITORING SYSTEMS FOR MILITARY AIRCRAFT - LESSONS LEARNED FROM THE SSCORE-ASTERISK CONTRACT

GUIDELINES FOR SMART STRUCTURAL HEALTH MONITORING SYSTEMS FO...

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Conference on smart Sensing, Processing, and Instrumentation

作者： KUDVA, J MARANTIDIS, C VANWAY, C ALPER, J PAUL, C NORTHROP CORP HAWTHORNECA 90250

ISBN: (纸本)0819414867

The smart structures Concept Requirements Definition Contract objectives were to: (1) establish requirements for an on-board smart structural health monitoring system (SHMS); (2) assess relevant smart structures technologies; (3) develop conceptual near-term and ideal SHMS designs; (4) identify gaps in current technologies; (5) perform selective testing; (6) investigate system benefits; and (7) outline future R & D needs for development of an operational SHMS. The salient results and key lessons learned from the contract are summarized. Under the contract, monitoring requirements for metallic and composite structures have been established. A crucial requirement that cannot reliably be met with current sensing technologies is the need to monitor damage remotely, when the location is not known a priori. Other required components of a SHMS are more mature and are or will be available for near-term applications. The development of a fully automated SHMS will require coordinated multidisciplinary efforts, the paper discusses these and related issues and presents an overall assessment of the SHMS concept.

关键词： Structural health monitoring Sensors smart structures Corrosion Composites Inspection Intelligence systems Remote sensing Sensor technology Software development

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controlLER IMPLEMENTATION ON INFINITE-ORDER STRUCTURAL SYSTEMS USING DISTRIBUTED SENSORS

CONTROLLER IMPLEMENTATION ON INFINITE-ORDER STRUCTURAL SYSTE...

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

作者： BUTLER, R RAO, V KOVA, L UNIV MISSOURI CTR INTELLIGENT SYSTROLLAMO 65401

ISBN: (纸本)0819414859

The design of spatially shaped distributed sensors for the control of infinite order structural systems has become a topic of interest in recent years. Sensor shape optimization techniques were developed for the design of optimal controllers on infinite order structural systems. In this paper, we investigate methods for the implementation of distributed sensors using polyvinylidene flouide (PVDF) film. The complexity of the sensor shapes depends on the mode shapes of the flexible structure and the performance measure of the controllers. The sensitivity of the sensor shape on the performance of the controller is being investigated. The problems associated with the practical implementation of distributed sensors with PVDF film are also identified. The shapes of the distributed sensors for the implementation of a linear quadratic regulator (LQR) and a pole- placement controller have been determined. These sensors are implemented on simple cantilever beam test articles using PVDF film. The details of hardware implementation of the controllers are presented. The closed loop performance of the controllers are compared with simulation studies. The sensitivity of the shapes of the distributed sensors for the LQR and pole-placement controllers is discussed.

关键词： Sensors Finite element methods Ferroelectric polymers Ferroelectric materials Actuators Device simulation Chemical elements Distributed computing Linear filtering control systems

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INDUCED STRAIN ACTUATION OF COMPOSITE BEAMS AND ROTOR BLADES WITH EMBEDDED PIEZOCERAMIC ELEMENTS

INDUCED STRAIN ACTUATION OF COMPOSITE BEAMS AND ROTOR BLADES...

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

作者： CHEN, PC CHOPRA, I UNIV MARYLAND CTR ROTORCRAFT EDUC & RESDEPT AEROSP ENGNCOLLEGE PKMD 20742

ISBN: (纸本)0819414859

The objective of this research is to develop a dynamically scaled (Froude scale) helicopter rotor blade with embedded piezoceramic elements as sensors and actuators to control blade vibrations. A 6-ft-diameter two-bladed bearingless rotor model was built, where each blade is embedded with banks of piezoelectric actuators at +/- 45-degree angles with respect to the beam axis on the top and bottom surfaces. A twist distribution along the blade span is achieved through in-phase excitation of the top and bottom actuators at equal potentials, while a bending distribution is achieved through out-of-phase excitation. In order to fix design variables and to optimize blade performance, a uniform strain beam theory is formulated to analytically predict the static bending and torsional response of composite rectangular beams with embedded piezoelectric actuators. Parameters such as bond thicknesses, actuator skew angle, and actuator spacing are investigated by experiments and then validated by theory. The static bending and torsional response of the rotor blades is experimentally measured and correlated with theory. Dynamic torsional and bending responses are experimentally determined for frequencies from 2-120 HZ to assess the viability of a vibration reduction system based on piezoactuation of blade twist. Although the magnitudes of blade twist attained in this experiment were small, it is expected that future models can be built with improved performance.

关键词： Actuators Skin Aluminum Foam Bismuth Composites Ferroelectric materials Manufacturing Vibration control Sensors

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smart structures and materials 1994: smart structures and Intelligent Systems

Smart Structures and Materials 1994: Smart Structures and In...

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1994 North American Conference on smart structures and materials: smart structures and Intelligent Systems

The proceedings contain 72 papers. The topics discussed include: active damping of flexible rotor blade dynamics using electrorheological-fluid-based actuators;electrorheological adaptive structures with embedded sensing and control;particle size effects in the electrorheological behavior of silica-poly (dimethylsiloxane) mixtures;multiobjective optimization procedure for the design of rotating composite box beams with discrete piezoelectric actuators;adaptive vibrational control of rotating helicopter blades carrying a tip mass;and design of high-force high-displacement actuators for helicopter rotors.

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smart AIRCRAFT BY CONTINUOUS CONDITION MONITORING OF AIRCRAFT structures AND COMPONENTS 2

SMART AIRCRAFT BY CONTINUOUS CONDITION MONITORING OF AIRCRAF...

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2nd European Conference on smart structures and materials

作者： ALLAEI, D QRDC INC EXCELSIORMN 55331

ISBN: (纸本)0819417009

There exists a need to have a reliable comprehensive software/hardware to monitor the condition of airframe structures and aircraft components. Failure of any structural parts of aircraft are often prohibitively costly and could even lead to loss of life. The existing technologies deal with the use of some of the characteristics of structural vibration and thus resulting in false detections. The use of complete vibration signature measured by an array of embedded (or attached) fiber-optic sensors, which are loaded with multiple laser beams generated by a single optical source, is the focus of this project. The hardware will be light weight, low cost, and effective for monitoring discontinuities, damage, and delamination in both composite and metal airframes.

关键词： Aircraft structures Computer simulations Fiber optics sensors Interfaces Composites control systems design Human-machine interfaces Mathematical modeling Metals smart materials

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