Tesis sobre el tema "Sensors and actuators placement"
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Szczepanski, Robert Walter. "Optimal placement of actuators and sensors for vibration control using genetic algorithms". Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341754.
Texto completoPotami, Raffaele. "Optimal sensor/actuator placement and switching schemes for control of flexible structures". Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-042808-124333/.
Texto completoKeywords: hybrid system, PZT actuators, performance enchancement, actuator placement, actuator switching. Includes bibliographical references (leaves 102-108).
Polyzos, Dimitrios. ""Measuring System Properties & Structured Diagnostics for the Selection of Sensors, Actuators Placement & Eigenstructure Assignment"". Thesis, City University London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.524712.
Texto completoSuwit, Pulthasthan Information Technology & Electrical Engineering Australian Defence Force Academy UNSW. "Optimal placement of sensor and actuator for sound-structure interaction system". Awarded by:University of New South Wales - Australian Defence Force Academy. School of Information Technology and Electrical Engineering, 2006. http://handle.unsw.edu.au/1959.4/38741.
Texto completoJha, Akhilesh K. "Vibration Analysis and Control of an Inflatable Toroidal Satellite Component Using Piezoelectric Actuators and Sensors". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28243.
Texto completoPh. D.
MURUGAN, JAYA MAHESH. "Vibration monitoring and control of industrial structures". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2858351.
Texto completoBrakna, Mohammed. "Sensor and actuator optimal location for dynamic controller design. Application to active vibration reduction in a galvanizing process". Electronic Thesis or Diss., Université de Lorraine, 2023. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2023_0152_BRAKNA.pdf.
Texto completoThe aims of the present PhD thesis are to determine a model that is both sufficiently accurate and numerically exploitable to propose optimal placement of sensors and actuators for active vibration control in a galvanizing line. A continuous hot-dip galvanizing process consists in covering a metal (here: a steel band) by a protective layer of zinc which avoids the corrosion due to the air. The thickness of this layer must be constant to guarantee the mechanical properties and surface condition of the product. In a galvanizing line, the moving steel strip is heated and then immersed in a liquid zinc bath before being wiped out by nozzles projecting air. The air flow, as well as the rotation of the driving rolls, among other things, creates vibrations affecting the wiping process and thus the regularity of the zinc deposit. Active control is therefore necessary, for example by means of electromagnets placed on either side of the moving steel strip. In a first step, a behavioral model of the steel strip taking into account the presence and propagation of vibrations was obtained by spatial discretization of a partial differential equation. This state space model was validated in simulation and experimentally on a pilot galvanizing line of ArcelorMittal Research in Maizières-lès-Metz. Once this model is established, the objective of the study is to find the optimal placement of sensors, to measure the vibrations of the strip as efficiently as possible, but also of actuators to minimize the amplitude of these vibrations by an appropriate control law. These problems of optimal placement are at the heart of the issues of active vibration control and are found in many fields of application. An optimal placement method based on Gramian maximization has been proposed in order to reduce the impact of disturbances on the system. Different control strategies have been considered such as (i) observed state feedback based on Kalman filter and LQ regulator; and (ii) extended observed state feedback to improve the results by also taking into account the disturbance estimation provided by a PI (proportional-integral) observer. Simulation and experimental results illustrate the thesis contributions
Perini, Efrain Araujo [UNESP]. "Redução de vibrações de rotores utilizando atuadores magnéticos e sistema de controle feedforward". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/94510.
Texto completoFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Este trabalho apresenta o desenvolvimento de uma análise teórica do desempenho de um sistema de controle ativo utilizando mancais magnéticos como atuadores de não-contato para a redução de vibrações em rotores. São analisados três modelos de rotores, sendo que em um deles aplica-se apenas o controle feedback e os outros são suportados apenas por mancais magnéticos, os quais também são os atuadores do controlador. Assim, Luna arquitetura de controle tipo feedforward é empregada sobreposta ao sistema de controle feedback dos atuadores nestes dois modelos, sendo urna análise realizada em relação ao desempenho do sistema de controle quanto às diferentes geometrias de distribuição de massa acopladas ao eixo do rotor. O enfoque principal deste trabalho é voltado para a análise do desempenho do sistema de controle em função da posição e quantidade dos sensores de erro (onde se deseja minimizar as vibrações) em relação à posição dos atuadores e das forças de excitação. As excitações são do tipo síncronas e sub-síncronas que normalmente aparecem em rotores com elevadas velocidades de rotação, como as turbomáquinas. Também é realizada urna análise das forças de controle necessárias a serem aplicadas pelos atuadores para se obter urna redução dos níveis de vibração do rotor na posição dos sensores de erro do sistema feedforward. A análise é executada empregando modelos de rotores desenvolvidos pelo método da matriz de impedância. Esta pesquisa também apresenta Luna aplicação da técnica de controle Feedforward em acústica, que realiza a depuração da voz para comunicação em ambientes ruidosos.
This research work brings a theoretical analysis of a control system performance that uses magnetic bearings as non-contact actuators to reduce rotor vibrations. It is analyzed three rotor models, in which one of them operates under the feedback control only. The other models are supported by magnetic bearings only, which also are the controller system actuators. Thus, a feedforward control scheme is applied over the feedback control inherent to the AMB control circuit. The analysis is carried out over these two last models regarding to the control performance for different geometry of mass distribution along the rotor. The focus of this work is to analyze the controller performance according to the sensor quantity and placement (where the vibrations are desired to be minimized) regarding to the actuator position and to the exciting forces. The subsynchronous and synchronous excitations are considered here since they frequently occur in high rotating speed rotors, as in the turbomachinery scenario. Also, the control force required by the actuators is monitored according to the sensors placement to reduce the local vibrations level and the analysis was carried out using the impedance matrix rotor modeling. Further, this work brings a modeling and an application of the feedforward active control scheme in the acoustics field used for voice extraction for communication in noisy environments.
Perini, Efrain Araujo. "Redução de vibrações de rotores utilizando atuadores magnéticos e sistema de controle feedforward /". Ilha Solteira : [s.n.], 2009. http://hdl.handle.net/11449/94510.
Texto completoAbstract: This research work brings a theoretical analysis of a control system performance that uses magnetic bearings as non-contact actuators to reduce rotor vibrations. It is analyzed three rotor models, in which one of them operates under the feedback control only. The other models are supported by magnetic bearings only, which also are the controller system actuators. Thus, a feedforward control scheme is applied over the feedback control inherent to the AMB control circuit. The analysis is carried out over these two last models regarding to the control performance for different geometry of mass distribution along the rotor. The focus of this work is to analyze the controller performance according to the sensor quantity and placement (where the vibrations are desired to be minimized) regarding to the actuator position and to the exciting forces. The subsynchronous and synchronous excitations are considered here since they frequently occur in high rotating speed rotors, as in the turbomachinery scenario. Also, the control force required by the actuators is monitored according to the sensors placement to reduce the local vibrations level and the analysis was carried out using the impedance matrix rotor modeling. Further, this work brings a modeling and an application of the feedforward active control scheme in the acoustics field used for voice extraction for communication in noisy environments.
Orientador: Luiz de Paula do Nascimento
Coorientador: Vicente Lopes Junior
Banca: Gilberto Pechoto de Melo
Banca: Kátia Luchese Cavalca Dedini
Mestre
Mitwalli, Ahmed Hamdi. "Polymer gel actuators and sensors". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9969.
Texto completoIncludes bibliographical references (p. [351]-361).
by Ahmed Hamdi Mitwalli.
Sc.D.
Scheidl, Rudolf. "Actuators and Sensors for Smart Systems". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200616.
Texto completoMOHAMED, MOHAMED ELSAID ELKHAYAT MOATAZBELLAH. "Interface Circuits for Sensors and Actuators". Doctoral thesis, Università degli studi di Pavia, 2018. http://hdl.handle.net/11571/1214860.
Texto completoExperimental measurements showed that the worst-case measurement for the capacitor pair matching is around 0.98% error at 500fF. This value is compliant to the feasibility of A/D converters for sensor readout with resolution better than 10 bits. It is clear from the results that matching performance is comparable to previous technologies, making the 28nm technology eligible for analog signal processing in front-end circuits for physical experiments and related data converters. Samples have been sent to irradiation facility to be exposed to different radiation doses in order to be re-measured and compared in terms of matching and absolute capacitance values with respect to the measurements done before. Based on the results obtained on the basic devices in 28nm technology, we designed a 14-bit 1MS/s extended range incremental A/D converter composed by the cascade of two resettable second-order sigma-delta modulators. The system is designed for reading out detector arrays in particle physics experiments. The two stages, ideally targeting 9 and 6 bits, respectively, are both based on a cascade of integrators with feed-forward (CIFF) architecture to maximize linearity. If necessary, they can work in pipeline to minimize conversion time. When the conversion of each sample by the two stages is completed, a digital recombination filter produces the overall ADC output word with the required resolution (ENOB) of at least 13 bits and a throughput of 1MS/s at the very low over sampling ratio (OSR) of 16. Each stage, implemented with the switched capacitor technique, consists of two integrators followed by a multi-bit quantizer and a capacitive DAC for the feedback. At the start of each conversion cycle, both analog integrators and the digital filter memory elements are reset. The ADC has been sent for fabrication in 28nm technology. Driving circuit for the piezoelectric actuators in ultrasonic washing machines The third project deals with the design of the driving circuit for the piezoelectric actuators in ultrasonic washing machines. The object of this project concerns the study and design of a driving and control system for an ultrasonic cleaning machine, or more commonly called ultrasonic washing machine. These devices are used in several industrial applications. Ultrasonic washing machines consist of a tank filled with a detergent solvent, an electronic interface circuit and one or more piezoelectric transducers, which are mechanically connected to the tank and electrically to the driving circuit. The driving system is connected from the AC mains and consists of three cascaded stages: a rectifier followed by a boost converter, to regulate the power factor and produce an intermediate DC voltage; a buck converter, to adjust the amplitude of the supply voltage for the piezoelectric transducers; an inverter, to drive the actuators with a square wave at their resonance frequency between 30kHz and 40kHz. A flyback converter has also been designed for generating the auxiliary power supply voltage for all the integrated components in the system. A control system based on an Arduino microcontroller has been developed to adjust the frequency of the square wave to the resonance frequency of the transducer, control the output voltage of the buck converter and read data from a current sensor. The system is designed and implemented on a PCB board of 10cm×15cm. The system has been tested on machined with two different tank sizes.
Johnson, David Gary. "Integrating sensors and actuators for robotic assembly". Thesis, University of Hull, 1986. http://hydra.hull.ac.uk/resources/hull:11276.
Texto completoDogramadzi, Sanja. "Sensors and actuators in computer controlled colonoscopy". Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369813.
Texto completoMelin, Oscar y Matilda Asperot. "Guidelines for placement of sensors : Placement of sensors in public areaswhile consideringcoverage, cost, and performance". Thesis, Jönköping University, JTH, Avdelningen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54034.
Texto completoEhresman, Jonathan David. "Integration of actuators and sensors into composite structures". Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/ehresman/EhresmanJ0809.pdf.
Texto completoSong, Changsik. "Design and synthesis of molecular actuators and sensors". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41554.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
To date, the most successful conducting polymer actuators are based on polypyrrole, which operates through incorporating and expelling counterions and solvent molecules to balance the charges generated by electrochemical stimuli (swelling mechanism). Although significant progress has been made, there still exists a need for developing new materials that would overcome the intrinsic limitations in the swelling mechanism, such as slow diffusion rate, limited expansion volume, etc. Our group has contributed this area with a different approach -- lecular mechanisms, which utilize a dimensional change of a single polymer chain. We propose two types of molecular mechanisms: contracting and expanding. We proposed earlier a calix[4]arenebased molecular actuator for the contracting mechanism, in which p-dimer formation was proposed as a driving force. In this dissertation, we first confirm by model studies that p-dimer formation can indeed be a driving force for the calix[4]arene-based system. We propose another molecular hinge, binaphthol moiety, for the contracting model. The syntheses of polymers with binaphthols and their characterization, including signatures of oligothiophene interactions, are described. Due to its chirality, we examined the possibilities of the binaphthol polymer as a chiral amine sensor. To create actuators that make use of the expanding model, we propose new conjugated seven-membered ring systems with heteroatoms (thiepin with sulfur and azepine with nitrogen) and their syntheses and characterization will be described. Inspired by the fact that sulfoxide has very low extrusion barrier in the related system, we applied the thiepin molecules to create a peroxide sensor.
(cont.) In addition, during the investigation of phenol functional groups in conducting polymers, we found interesting properties that strategic positioning of phenol groups can render a conjugation-broken meta-linked system just as conductive as a fully conjugated para-linked isomeric system.
by Changsik Song.
Ph.D.
Yun, Yeoheung. "Nanotube Sensors and Actuators in Mechanics and Medicine". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1150836513.
Texto completoAphanuphong, Sutha. "Embedded heaters and sensors for micro SMA actuators". Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1458441.
Texto completoAnderson, Eric H. (Eric Harold). "Robust placement of actuators and dampers for structural control". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12209.
Texto completoGeykhman, Roman. "Optimal placement of binary actuators in deformable optical systems". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67794.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 111-113).
Recently, exploration has been conducted into the applicability of binary mechatronics to active figure correction in large optical systems such as space telescopes and ground-based solar-thermal concentrators. This Thesis will continue this exploration. The information-theoretic requirements of the corrective commands required in active optics will be explored to understand the dimensionality of the continuous workspace sampled by binary actuation. In both the minimal expected error and the minimal computation time sense, the optimal discrete workspace is the uniform discrete distribution. A rigorous analogy between binary mechatronics and discrete random variables will be used to show that this optimal workspace is achievable by a linear superposition of actuators with exponentially decreasing influences on the optical surface. It will be proven that elasticity can be exploited to construct mechanisms where constant magnitude actuators exhibit exponentially decaying influences on certain parts of the mechanism, allowing for designs where individual binary actuators correspond to binary bits of the required deformation. A planar truss mechanism designed with this philosophy will be presented and shown to have independent kinematic control of multiple adjacent displacements on its top side. Finally, this design will be shown extend to three dimensions in a manner applicable to optical figure correction. Due to the complexity of mechanisms that meet the optimality criteria, only theoretical analysis will be presented.
by Roman Geykhman.
S.M.
Rostain, William. "Engineering of RNA sensors and actuators in living cells". Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95177/.
Texto completoSareen, Harpreet. "Cyborg botany : augmented plants as sensors, displays and actuators". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/114063.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 94-98).
Plants are photosynthetic eukaryotes with a billion years of evolutionary history. While primarily sessile, they have developed distinctive abilities to adapt to the environment. They are self-powered, self-fabricating, self-regenerating and active signal networks. They carry highly advanced systems to sense and respond to the environment. We strive for such sensing and responses in our electronics; self growing or self repairing abilities in our architecture; and being sustainable at scale in general. The industrial and technological thought process has mostly been devising artificial means or replicating natural systems synthetically. However, I propose a convergent view of technological evolution with our ecology where techno-plant hybrids are created. The approach is to formulate symbiotic associations and to place the technology in conjunction with the plant function(s). In this thesis, I go from the outside to inside the plants in conceiving such synergetic processes and present case studies of their implementation and analysis. I begin with a robot-plant hybrid where the robotic device adds mobility and is triggered with the plant's own signals. Next, lead (II) detection nanosensors are presented which reside inside the leaf of a plant and continuously sample through plant hydraulics. This is followed with a design study for plants with new conductive channels grown inside them and their subsequent use as inconspicuous motion sensors. I conclude with a symbiotic robot that lives on a sunflower plant and automatically trains or directs its growth with onboard lighting. The end result is an augmented-plant society where technology adds non-native functions or redirects the natural processes..
by Harpreet Sareen.
S.M.
Kabeya, Kazuhisa III. "Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36709.
Texto completoMaster of Science
Lloyd, Justin Michael. "Electrical Properties of Macro-Fiber Composite Actuators and Sensors". Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10013.
Texto completoMaster of Science
Kostner, Stefan [Verfasser]. "Sensors and Actuators for Single Particles and Cells / Stefan Kostner". Aachen : Shaker, 2010. http://d-nb.info/1124365214/34.
Texto completoSavran, Cagri Abdullah 1976. "Broadband active structural control using collocated piezoelectric sensors and actuators". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/89278.
Texto completoMcCain, Amy Jean. "Shaped actuators and sensors for local control of intelligent structures". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/46445.
Texto completoYung, Jeremy Hoyt 1971. "Compensation methodologies for local control using strain actuators and sensors". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10627.
Texto completoKar, S. B. "Studies on electromechanical sensors and actuators based on conducting polymers". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2005. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2488.
Texto completoSchäfer, Carsten [Verfasser]. "Optimization approaches for actuator and sensor placement and its application to model predictive control of dynamical systems / Carsten Schäfer". München : Verlag Dr. Hut, 2015. http://d-nb.info/1079768459/34.
Texto completoCormier, Roger. "Isolation of concurrent faults in sensors and actuators in control systems". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/NQ46290.pdf.
Texto completoTamirisa, Prabhakar A. "Plasma polymerized hydrogel thin films for applications in sensors and actuators". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19827.
Texto completoCommittee Chair: Hess, Dennis W.; Committee Member: Henderson, Cliff L.; Committee Member: Hunt, William D.; Committee Member: Meredith, J. Carson; Committee Member: Prausnitz, Mark R.
Sivakumar, Kousik. "Nanowire sensor and actuator". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 5.53 Mb., 108 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1435931.
Texto completoFerrell, Cynthia. "Robust Agent Control of an Autonomous Robot with Many Sensors and Actuators". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/6791.
Texto completoObal, Michael Walter. "Vibration control of flexible structures using piezoelectric devices as sensors and actuators". Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/12025.
Texto completoDaraji, Ali Hossain Alewai. "Active vibration control of flexible structures by optimally placed sensors and actuators". Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2484.
Texto completoHuang, Wei-Ping. "Quasilinear Control of Systems with Time-Delays and Nonlinear Actuators and Sensors". ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/967.
Texto completoWei, Yu Zhang. "Design and development of new micro-force sensors". Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691170.
Texto completoSankar, Sandhya. "INTELLIGENT PLACEMENT OF METERS/SENSORS FOR SHIPBOARD POWER SYSTEM ANALYSIS". MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-09102007-140439/.
Texto completoSwathanthira, Kumar Murali Murugavel Manjakkattuvalasu. "Implementation of an actuator placement, switching algorithm for active vibration control in flexible structures". Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-1120102-210634.
Texto completoKeywords: Actuator placement algorithm; piezoelectric actuators; LQR; Galerkin; supervisory control; active vibration control; FEA; switching policy; dSPACE. Includes bibliographical references (p. 58-64).
Mewer, Richard C. "Analysis and Structural Health Monitoring of Composite Plates with Piezoelectric Sensors and Actuators". Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/MewerRC2003.pdf.
Texto completoNewman, Scott M. "Active damping control of a flexible space structure using piezoelectric sensors and actuators". Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23517.
Texto completoThis thesis details the experimental analysis of an active damping control technique applied to the Naval Postgraduate School's Flexible Spacecraft Simulator using piezoceramic sensors and actuators. The mass property of the flexible arm is varied to study the frequency effects on the Positive Position Feedback (PPF) algorithm. Multi-modal dynamics response is analytically studied using a finite-element model of a cantilevered beam while under the influence of three different control laws: a basic law derived rom the Lyapunov Stability Theorem, PPF and Strain Rate Feedback (SRF). The advantages and disadvantages of using PPF and SRF for active damping control are discussed.
Raykar, Vikas Chandrakant. "Position calibration of acoustic sensors and actuators on distributed general purpose computing platforms". College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/39.
Texto completoThesis research directed by: Dept. of Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Treanor, Kirk E. "Performance and optimal placement of piezoceramic actuators for shape control of a cantilever beam". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA316163.
Texto completoGottfarb, Bart Samuel. "Optimal placement of plasma actuators on trucks : A drag reduction study using adjoint methods". Thesis, KTH, Aeroakustik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203346.
Texto completoTiberg, Jesper. "An evaluation of algorithms for real-time strategic placement of sensors". Thesis, University of Skövde, School of Humanities and Informatics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-865.
Texto completoIn this work an investigation is performed in whether the algorithms Simultaneous Perturbation Stochastic Approximation (SPSA) and Virtual Force Algorithm (VFA) are suitable for real-time strategic placement of sensors in a dynamic environment. An evaluation of these algorithms is conducted and compared to Simulated Annealing (SA), which has been used before in similar applications.
For the tests, a computer based model of the sensors and the environment in which they are used, is implemented. The model handles sensors, moving objects, specifications for the area the sensors are supposed to monitor, and all interaction between components within the model.
It was the belief of the authors that SPSA and VFA are suited for this kind of problem, and that they have advantages over SA in complex scenarios. The results shows this to be true although SA seems to perform better when it comes to smaller number of sensors to be placed
Hixenbaugh, Franklin D. "A study on piezoelectric actuators and sensors for vibration control of flexible space structures". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274925.
Texto completoThesis advisor(s): Brij N. Agrawal. "September 1993." Includes bibliographical references. Also available online.
Miller, Duncan Lee. "Development of resource-constrained sensors and actuators for in-space satellite docking and servicing". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98697.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 171-177).
Most satellites on-orbit today are not intended to physically approach or interact with other spacecraft. However, the robotic servicing of orbiting assets will be an economically desirable (and often scientifically necessary) capability in future space enterprises. With the right set of tools and technologies, satellites will be able to autonomously refuel, repair, or replace each other. This has the potential to extend mission lifetimes, reduce orbital debris and make space more sustainable. Spacecraft may also assemble on-orbit into larger aggregate spaceflight systems, with applications to sparse aperture telescopes, solar power stations, fuel depots and space habitats. The purpose of this thesis is to address the highest risk elements associated with the docking and servicing of satellites: the sensors, actuators, and associated algorithms. First, a peripheral agnostic robotics platform is introduced, upon which a suite of technology payloads may be developed. Next, a flight qualified docking port for small satellites is presented, and the results detailing its operation in a relevant environment are discussed. In addition, we review a high precision relative sensor designed to enable boresight visual docking. The measurements from this optical camera are applied to a nonlinear estimator to provide the highly accurate sensing necessary for docking. Finally, a free-flying robotic arm is examined and modeled as an experimental payload for the SPHERES Facility on the International Space Station.
by Duncan Lee Miller.
S.M.
SADLER, DANIEL J. "DEVELOPMENT OF A NEW MAGNETIC INERCONNECTION TECHNOLOGY FOR MAGNETIC MEMS DEVICE APPLICATIONS". University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin983800458.
Texto completo