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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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control SURFACE MIRROR WITH LOCAL HEATERS 2

CONTROL SURFACE MIRROR WITH LOCAL HEATERS

引用

2nd European Conference on smart structures and materials

作者： REZNICHENKO, VV KULAGINA, V LUTINSKAYA, M LEONOV, Y SI VAVILOV STATE OPT INST RES CTRST PETERSBURG 199034RUSSIA

ISBN: (纸本)0819417009

The majority of wavefront disturbances of space reflector and space telescopes are due to external thermal fields variations and the optical surface deformations. Two principal methods of disturbances compensation exist: a thermostabilization by temperature gradients decreasing and the mirror surface active thermodeformation. This can be accomplished only by some thermal methods: either by temperature gradients elimination or by keeping some given temperature field. The latter method is carried out by a system of heaters and sensors located on mirror elements /1,2/. Thermal deformation correction of distortions of optical and structural elements surface is possible, too, in accordance with control system responses. A thermo-optical compensation system (TOCS) consists of individual control units which contain heaters and sensors fixed to respective mirror elements as well as electronic measurement and control units (MCU) interfaced to them Fig. 1. The MCU are made constructively of unified printed circuit boards which can be functionally divided into various zones for interfacing of input/output, memory and supply circuits.

关键词： Mirrors control systems Thermography Sensors Space telescopes Optical components Reflectors Wavefronts Silica smart materials

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smart structures: the role of fiber optics

Smart structures: the role of fiber optics

引用

Interferometry '94: Interferometric Fiber Sensing

作者： Culshaw, Brian Michie, W.C. Gardiner, Peter T. Univ. of Strathclyde Glasgow Strathclyde UK

ISBN: (纸本)0819416746

The concept of the smart structure integrates structural engineering, sensing, control systems and actuation to provide a mechanical assembly which is capable of responding to its environment and/or loading conditions. The realization of the smart structure requires integration of skills in a variety of scientific and engineering disciplines ranging from mechanical engineering through materials science into signal processing, data analysis, sensing and actuation. The sensing technology must have a number of key features of which the ability to take distributed measurements of various parameters throughout the structure is paramount. Fiber optics technology therefore promises to have a significant role to play in the evolution of the smart structures concept. This paper analyses this role in detail, presents an assessment of the current state-of-the art in fiber optic technology related to smart structures and presents a scenario for future developments.

关键词： Fiber optics

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DEVELOPMENT OF MICROBEND SENSORS FOR PRESSURE, LOAD, AND DISPLACEMENT MEASUREMENTS IN CIVIL ENGINEERING

DEVELOPMENT OF MICROBEND SENSORS FOR PRESSURE, LOAD, AND DIS...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： GROSSMAN, B COSENTINO, P DOI, SB KUMAR, G VERGESE, J FLORIDA INST TECHNOL CTR FIBEROPT SENSOR SYST & SMART CIVIL ENGN STRUCTMELBOURNEFL 32901

ISBN: (纸本)0819414867

We are developing low cost, rugged, and reliable fiberoptic sensors to meet current and future needs in civil engineering, including those of smart civil structures. Our work has concentrated on load, pressure, and displacement sensors, including pore water pressure sensors. We have built and demonstrated sensors in the laboratory with loads up to 50 lb., water pressures of 100 psi, and displacements up to 1 mm. Repeatability of sensor measurements are within 5% and are being improved with continued development. The range and sensitivity of the sensors can be easily changed without changing the basic sensor design. We also have multiplexed two water pressure sensors on a single fiber. We describe the sensor construction and experimental performance.

关键词： Sensors Civil engineering Bridges Optical fibers Calibration Coating Fiber optics sensors Latex Light emitting diodes Multiplexing

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RESONANT INTEGRATED MICROMACHINED (RIMS) ACOUSTIC SENSOR DEVELOPMENT

RESONANT INTEGRATED MICROMACHINED (RIMS) ACOUSTIC SENSOR DEV...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： SCHOESS, JN ZOOK, JD BURNS, DW HONEYWELL TECHNOL CTR BLOOMINGTONMN 55420

ISBN: (纸本)0819414867

Future advanced fixed- and rotary-wing aircraft, launch vehicles, and spacecraft will incorporate fiber-optic smart sensor networks to monitor structural integrity and manage overall structural health. This paper describes the design of an acoustic emission (AE)-based micromachined sensor for new and aging aircraft applications to assess preflight readiness, in- flight structural integrity, and post-flight time-based maintenance. This unique sensor approach combines silicon micromachining, free-space optical waveguides, high-speed optical interconnects, and supervisory sensor management to measure stress waves related to AE events. A unique second-generation polysilicon resonant microbeam sensor design is described. It incorporates a micron-level vacuum-encapsulated microbeam to optically sense structural-integrity acoustic parameters and to optically excite the sensor pickoff. Its principal of operation, significant payoffs and benefits, and wafer-level laboratory test data results are summarized.

关键词： Sensors Acoustic emission Acoustics Fiber optics sensors Free space optics Metals Silicon smart structures Transducers Wafer-level optics

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MULTI-MEASURAND MULTIPLEXED EXTRINSIC FABRY-PEROT INTERFEROMETRIC SENSORS

MULTI-MEASURAND MULTIPLEXED EXTRINSIC FABRY-PEROT INTERFEROM...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： POLAND, SH BENGTSSON, JP BHATNAGAR, M RAVIKUMAR, KC DEVRIES, MJ CLAUS, RO VIRGINIA POLYTECH INST & STATE UNIV BRADLEY DEPT ELECT ENGNELECTROOPT RES CTRBLACKSBURGVA 24061

ISBN: (纸本)0819414867

The commercialization of optical fiber sensors in smart structure applications largely depends on the development of a multi-sensor system, capable of simultaneously monitoring different optical fiber sensors. Efficient multi-sensor systems can be realized through multiplexing arrays of sensors within a system, reducing the number of input/output information channels between the support electronics and optical sensors. We demonstrate a sensor system, comprised of four multiplexed extrinsic Fabry-Perot interferometers, that uses a code division multiplexing technique to address each sensor. Qualitative measurements of strain and temperature, obtained with this multi-measurand multiplexing system, and an evaluation of crosstalk between sensors is presented.

关键词： Sensors Multiplexing Signal detection Fiber optics sensors Code division multiplexing Interferometry Modulation Fabry–Perot interferometers Sensing systems smart structures

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DAMAGE ASSESSMENT OF smart COMPOSITE PLATES USING PIEZOCERAMIC AND ACOUSTIC-EMISSION SENSORS

DAMAGE ASSESSMENT OF SMART COMPOSITE PLATES USING PIEZOCERAM...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： OKAFOR, AC CHANDRASHEKHARA, K JIANG, YP KILCHER, RR UNIV MISSOURI ROLLA DEPT MECH & AEROSP ENGN & ENGN MECHROLLAMO 65401

ISBN: (纸本)0819414867

An experimental study is conducted to develop a technique for detecting and assessing damage in laminated composite plates using piezoceramic (PZT) and acoustic emission (AE) sensors. Test specimens of glass/epoxy and graphite/epoxy composite plates are fabricated using a hot press cure technique. PZT patches and AE sensors are surface mounted on the composite plates to serve as sensors. Low velocity impact tests of plates with all four edges clamped are conducted using a drop weight testing frame with the composites in an undamaged state and again after the composites are damaged. Two test methods are used to assess the damage of the composite plates. The piezoceramic sensor output and the acoustic emission sensor signals are measured during the impact tests. Modal testing is performed to determine the frequencies and dampings of the structures from the frequency response function. The plate is then damaged by a high velocity impact and the results are correlated with the undamaged plate data. It is found that the piezoceramic sensor output is very sensitive to the composite damage and change in modal frequencies and dampings is observed.

关键词： Composites Sensors Acoustic emission Ferroelectric materials Signal detection Aluminum Acoustics Actuators Aerospace engineering Signal processing

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An experiment in feedforward control for the reduction of sound transmission through an elastic plate backed by a rigid rectangular cavity

An experiment in feedforward control for the reduction of so...

引用

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

作者： Ellis, Graham K. Koshigoe, Shozo Aerospace Corporation P.O. Box 92957 M4/972 Los AngelesCA90009-2957 United States

The payload compartment of space launch vehicles is an acoustically severe environment with sound pressure levels that often exceed 130 dB. Many of the design constraints for satellites are driven by the launch loads and any reduction in these loads would allow lighter spacecraft and significant cost savings because of reduced launch weight and testing requirements. In order to determine the levels of sound attenuation possible in such an application, a simple experimental apparatus consisting of a flexible plate backed by a rigid rectangular cavity has been built to mimic the behavior of a launch vehicle payload compartment. An external speaker is used to simulate the pressure loading caused by vehicle exhaust and turbulent flow around the launch vehicle. This paper provides a comparison of the harmonic disturbance attenuation capability and transient/convergence performance of a fixed analog feedforward and a filtered-x LMS adaptive feedforward controller for the cavity backed plate problem using piezoelectric ceramic (PZT) actuators on the flexible plate and polyvinylidene fluoride (PVDF) pressure and plate vibration sensors. controllers are developed for the first plate controlled mode and the first cavity controlled mode. © 1994 SPIE.

关键词： Vibrations (mechanical)

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CURRENT RESEARCH IN TIMED RELEASE OF REPAIR CHEMICALS FROM FIBERS INTO MATRICES 2

CURRENT RESEARCH IN TIMED RELEASE OF REPAIR CHEMICALS FROM F...

引用

2nd European Conference on smart structures and materials

作者： DRY, CM UNIV ILLINOIS SCH ARCHITECTUREURBANAIL 61801

ISBN: (纸本)0819417009

The subject of this research is the enhancement of properties beyond that available in an original hardened material by the release of 'healing' chemicals such as adhesives from hollow fibers into cementitious matrices in response to loading. Thus, the sensing of a crack by the fibers or the breaking of coating starts the activation of a remedial process (i.e., the release of a sealing or adhering chemical). This capacity for self-healing occurs whenever and wherever cracks are generated. In terms of fracture mechanics, this research concerns the repair of cracks and rebonding of fibers by chemicals released from hollow fibers at the fiber wall and into the adjacent cracks. The overall property change is an increased flexural toughening. The mechanisms for that appears to be an adhesive rebonding of the fibers and a crack-filling with adhesives which causes the material to become stronger when it is bonded inside cracks or pores.

关键词： Adhesives Matrices X-rays Cements Coating control systems Glasses smart materials Biological and chemical sensing Mechanics

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PROCESSING MONITORING OF CARBON PHENOLIC COMPOSITES USING smart SENSORS

PROCESSING MONITORING OF CARBON PHENOLIC COMPOSITES USING SM...

引用

Conference on smart Sensing, Processing, and Instrumentation

作者： CHIOU, S KUKUCHEK, P ECHTERNACH, D CARMAN, G LAI, L ROHR INC DEPT ADV TECHNOLRIVERSIDECA 92503

ISBN: (纸本)0819414867

It is well documented that high void content and delaminations are observed during the fabrication of thick carbon/phenolic composites due to the high percentage of volatile release that occurs during polymerization. In order to eliminate these imperfections and enhance product quality for thick carbon/phenolic composites, smart sensors are used to monitor the property changes during the processing and control of the component to minimize this effect. This paper documents an effort to develop a technique to monitor and collect sensor data during the curing process of a general material system. Data obtained from sensors are used to generate an expert processing knowledge base which automatically controls the composite cure state based on direct sensor response, in lieu of classical time/temperature techniques (i.e. recipes). Microdielectric, ultrasonic, thermopile, thermal couple, and Extrinsic Fabry-Perot Interferometer (EFPI) sensors are investigated as potential candidates to monitor and subsequently control the manufacturing process of a composite material. In addition to classical optical sensors, a modified EFPI thermal sensor is employed to monitor temperature variations.

关键词： Sensors Composites Dielectrics Ultrasonics Process control Signal attenuation Signal processing smart sensors Temperature metrology control systems

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INITIAL STUDIES INTO THE USE OF ACTIVE CONSTRAINED LAYER DAMPING FOR controlLING RESONANT VIBRATION

INITIAL STUDIES INTO THE USE OF ACTIVE CONSTRAINED LAYER DAM...

引用

Passive Damping Conference

作者： AZVINE, B TOMLINSON, GR WYNNE, RJ UNIV MANCHESTER DYNAM & CONTROL RES GRPMANCHESTER M13 9PLLANCSENGLAND

ISBN: (纸本)0819414883

The work described in this paper is concerned with controlling the strain of the constraining layer of a composite structure in such a way as to enhance the shear generated in the viscoelastic material and hence improve the overall damping of the composite structure. The results have indicated that this concept of active damping produces very effective levels of vibration suppression. In the case of cantilever beams the first two modes can be almost eliminated when velocity feedback of the beam tip is used. The results show that the addition of active control and passive damping in a single structure combines the advantages of passive damping in the higher modes and active control in the lower modes. In addition active damping as defined in this paper produces a fail safe mechanism in case of instability occurring in the feedback loop since passive damping is always present.

关键词： Actuators Composites Ferroelectric materials Beam shaping Ceramics Feedback loops Feedback signals Amplifiers Polymers smart structures

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