Дисертації з теми "Flow control system"
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Yan, Li. "On the traffic flow control system." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39431174.
Повний текст джерелаYan, Li, and 顏理. "On the traffic flow control system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39431174.
Повний текст джерелаBornman, Waldo. "Improved mine cooling system performance through the control of auxiliary systems / W. Bornman." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9105.
Повний текст джерелаThesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2013
Thiron, Benjamin. "Global Control of a Life Support System : Flow control and optimisation." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278509.
Повний текст джерелаÄmnet för det här examensprojektet är MELiSSA (Micro-Ecological Life Support System Alternative) Life Support System (LS som utvecklats av Europeiska rymdorganisationen (ESA). MELiSSA LSS ämnar att återvinna mänskligt avfall till syre (O2), vatten och mat för en rymdbesättning. Examensarbetet syftar att modellera och studera MELiSSA LSS för att utforma ett globalt kontrollsystem som säkerställer besättningens överlevnad samtidigt som de nödvändiga resurserna minimeras. MELiSSA LSS består av fyra biokemiska reaktorer, kallat “utrymmena”, som kontrolleras lokalt. En modell av all tänkbara kritiska flöden som utbyts mellan utrymmena är byggd utifrån ett funtionellt perspektiv. Flödena kontrolleras med Predictive Functional Control (PFC) metoden.Studien bekräftar att MELiSSA LSS kan fungera korrekt men kräver externa resurser. Dessutom visar studien att MELiSSA LSS kan upfylla sitt mål givet rätt externa resurser. Målet med MELiSSA LSSS är att producera 100% av O2, mer än 90% av vattnet och 40% av maten som besättningen behöver för att överleva. Med en ytterligare mängd ammoniak (NH3), salpetersyra (HNO3) och koldioxid (CO2), når LSS en produktion på 100% av O2, mer än 100% av vattnet samt mellan 45 och 50% av maten som besättningen behöver. Vid optimering reduceras massan som behöver bäras per astronaut per dag till mindre än 50% av massan som behövs utan optimering. Det motsvarar ungefär 12% av massan som behövs utan ett återvinningssystem. Modellen na studie kan även användas som dimensioneringsmodell eller som en miljö och kontextualiseringsmodellr utveckling och testning av de olika utrymmena.
Mohd, Tahir Muhammad. "Instrumentation and control and industrial computer systems: Pumps and flow control valves for universal water system." Thesis, Mohd Tahir, Muhammad (2018) Instrumentation and control and industrial computer systems: Pumps and flow control valves for universal water system. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/41920/.
Повний текст джерелаNilsson, Joel. "Embedded Control System for a High Precision Flow Meter." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49840.
Повний текст джерелаKreikebaum, Frank Karl. "Control of transmission system power flows." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50392.
Повний текст джерелаTomashevskyi, Roman, Viacheslav Kulichenko, and Nikolay Mahonin. "System for Flow Rate Regulation with Pulse-Width Modulation." Thesis, Kyiv polytechnic institute, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/7880.
Повний текст джерелаSreenivasachar, Kannan. "Unified power flow controller, modeling, stability analysis, control strategy and control system design." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60570.pdf.
Повний текст джерелаMundy, David H. "Decentralised control flow : a computational model for distributed systems." Thesis, University of Newcastle Upon Tyne, 1988. http://hdl.handle.net/10443/2050.
Повний текст джерелаWeigang, Li. "Knowledge-based system for air traffic flow management : timetable rescheduling and centralized flow control." Instituto Tecnológico de Aeronáutica, 1994. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1711.
Повний текст джерелаLaird, Daniel T., and Jon Morgan. "Data Flow and Remote Control in the Telemetry Network System." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606151.
Повний текст джерелаThe Central Test and Evaluation Investment Program (CTEIP) Integrated Network Enhanced Telemetry (iNET) program is currently developing new standards for wired-wireless local area networking (LAN-WLAN) using the Internet Protocol (IP), for use in telemetry (TM) channels, under the umbrella of the Telemetry Network System (TmNS). Some advantages of TmNS are real-time command and control of instrumentation, quick-look acquisition, data retransmission and recovery ('gapless TM' or 'PCM backfill'), data segmentation, etc. The iNET team is developing and evaluating prototypes, based on commercial 802.x and other technologies, in conjunction with Range Commander's Council (RCC) Inter-Range Instrumentation Group (IRIG) standards and standards developed under the iNET program.
Fang, Yong Jie. "Dynamic and transient system control using fast acting quadrature boosters." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244084.
Повний текст джерелаRydeman, Gustav. "Decision Support for Work Flow Control in a Warehouse Management System." Thesis, Uppsala University, Department of Information Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112111.
Повний текст джерелаAs volatility and customer demands increase, companies are simultaneously trying to reduce their logistic costs. Distribution centers are being forced to increase their agility and flexibility in order to rapidly execute on continuously evolving logistics plans. One proven way of gaining warehouse efficiency and create visibility into processes is through implementation of a Warehouse Management System (WMS) – a leverage technology that introduces automation in warehouse processes. With system directed task assignment work can be optimally balanced and distributed to available resources and auto-generate tasks with high quality. A critical aspect of this have shown to be prioritization of tasks in the dynamic terminal environment. To introduce a new work flow support into an existing organization requires changes in routines, roles and organization to harvest the real efficiency gains. In this report these problematics are applied to the distributing terminal of SCA Transforest, Tunadal, Sweden. A benchmarking study of a terminal in the same business, the Stora Enso terminal in Zeebrügge, Belgium, is the object of comparison. At the latter terminal system directed task assignment has been successfully implemented. Based on the findings from the benchmarking study and other research this report present important success factors as well as specific solutions to issues regarding automation, flexibility and process visibility - with the purpose to guide SCA Transforest in the future system development.
Kotsbak, Marius Bjørnstad. "Microcontroller based fluid flow and image control system for biochemical analysis." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18325.
Повний текст джерелаOKUMA, Shigeru, Tatsuya SUZUKI, YoungWoo KIM, and Tatsuya KATO. "Model Predictive Control of Traffic Flow Based on Hybrid System Modeling." Institute of Electronics, Information and Communication Engineers, 2005. http://hdl.handle.net/2237/14988.
Повний текст джерелаBarreto, Hugo. "PARALLEL SIMULATION FOR CONCURRENT DEVELOPMENT OFMANUFACTURING FLOW AND ITS CONTROL SYSTEM." Thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160268.
Повний текст джерелаFöretag måste idag vara innovativa för att uppnå eller behålla en konkurrenskraftig position på marknaden. I tillverkande företag kräver nya produkter ofta design av tillverkningssystemet i sig, vilket i hög grad ökar produktutvecklingstiden. Tillverkningssystemutveckling har på sistone förlitat sig på simuleringsmodeller, vilket minskar behovet av att testa hårdvaran. Däremot är de tekniska mjukvarorna som behövs för utveckling isolerade. Concurrent engineering metoder har funnit applikationer vid koppling mellan produkten och produktionssystemet. Däremot har man forskat för lite i samtidig utvecklingen i de olika stegen i tillverkningssystemet. Den här rapporten presenterar en kommunikationsmetod för att ansluta två simuleringsmodeller parallellt i två olika datorer, i vad som kan kallas en distribuerad simulering. Ena modellen är den flödessimuleringen vilken modelleras som en diskret-händelsestyrd simulering (DES), medan den andra modellen är det kontrollsystemet som modelleras som Finit Tillståndsmaskin (FSM). Båda modeller körs i Matlab/Simulink. Det här innebär att två utvecklare kan arbeta samtidigt med utvecklingsuppgifterna i stället för att behöva jobba i sekvens, och få validering samtidigt som utvecklingen sker. Kommunikationen mellan systemen uppnås med den OPC specifikation, en etablerad teknik i nätverkskontrollsystem (NCS). Med en enkel exempel modell, körs systemet parallellt. Och effektiviteten observeras medan modellen anpassas till det distribuerade formatet. De största svårigheterna med implementering grundar sig i DCOM-konfiguration som är grundläggande för OPC teknik och installationen av datautbyteslägen (synkron / asynkron). Den distribuerade simuleringen kräver körning i realtid så det kan fungera korrekt och pålitligt, vilket resulterar i längre simuleringstider än en enkel plattform simulering. Finit Tillståndsmaskiner användes också med framgång för att modellera kontrollsystem. Denna tekniken förenklar utveckling och problemlösning på grund av sina formell struktur och visuell gränssnitt. Resultatet av det här projektet visar goda möjligheter till fortsatta studier i tillämpningen av distribueradsimulering i samtidig (concurrent) utveckling. Rapporten ger också goda förutsättningar för komplexare simuleringar med detta koncept, både i de modeller som användes och antalet datorer som kan anslutnas parallellt.
Elgayar, Ibrahim. "Mathematical modelling, flight control system design and air flow control investigation for low speed UAVs." Thesis, City University London, 2013. http://openaccess.city.ac.uk/2737/.
Повний текст джерелаVaron, Eliott. "Contrôle réactif d'écoulements décollés à l'aide de PIV temps réel." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET008/document.
Повний текст джерелаSeparated flows are ubiquitous in nature and industrial systems, such as diffusers, airfoils, air conditioning plants, moving vehicles... As the separation can strongly influence the performances of such devices, investigating their dynamics and their control is of great interest.A visual sensor developed at PMMH laboratory is first improved to measure in real time the velocity fields and its derived values for flows available in wind tunnels. Based on an optical flow algorithm from the computer vision domain, this new experimental approach makes easier parametric studies and may be used in closed-loop controls.The dynamics of the flow over a flat plate are then investigated. A system identification method - the dynamic observer - is successfully implemented to build a reduced-order model of the transient flow, which captures and predicts well the instabilities generated.Finally, the fully turbulent wake of the square-back Ahmed body is described. Dynamical system tools are applied to characterize it. Using continuous and pulsed micro-jets, different forcing strategies are analyzed. An opposition closed-loop control is implemented, tracking and driving the recirculation
Skvorchevsky, A. Y. "ELS capacity control system for axial-piston pumps." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/46920.
Повний текст джерелаJuillet, Fabien. "Control of convection-dominated flows." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/docs/01/00/94/63/PDF/PhD_Juillet_Fabien.pdf.
Повний текст джерелаIn this thesis, a flow control procedure is developed numerically and is then implemented experimentally. The purpose of this procedure is to reduce the amplitude of perturbations in convection dominated flows. To design such a technique three aspects are analyzed in a first part. Since information in convection-dominated flows essentially travel downstream, incoming perturbations are better described by placing sensors upstream. This intuitive idea is studied quantitatively by introducing the concept of visibility length. In addition, a description of the flow dynamics is obtained using system identification techniques. These tools have the advantage of providing models based solely on experimentally accessible data and are therefore directly applicable to real flows. Finally, a feed-forward control approach is found to be most appropriate and a comparison with the classical linear quadratic gaussian technique is presented from numerical and theoretical point of views. In a second part, these three aspects are then taken into account in the design of a feed-forward identification and control procedure, which is then simplified to be more amenable to practical implementations in experiments. In particular, the system impulse responses are first identified, and are then directly used for the computation of the control law. Hence, the technique only relies on simple least-squares minimizations and has the advantage of manipulating quantities that have clear physical meanings, such as perturbation convective speeds and characteristic frequencies. Thus, in a last part, the control procedure is applied experimentally to the quenching of natural disturbances in a plane channel flow at Re = 870. Results show that the magnitude of the signal recorded by the objective sensor can be reduced by up to 45%
Sheu, Hsin-Teng. "A coordinated decentralized flow and routing control algorithm for an automated highway system /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu148758564557836.
Повний текст джерелаBjörkman, Carl. "Computing component specifications from global system requirements." Thesis, KTH, Teoretisk datalogi, TCS, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210843.
Повний текст джерелаOm vi har ett program med strikta kontrollflödeskrav och vill garantera att vissa systemkrav uppfylls genom att verifiera formella egenskaper av detta program, samtidigt som en del av kodbasen är i form av ett plug-in eller tredjeparts-bibliotek som vi inte har tillgång till vid verifieringen, så kan proceduren som presenteras i detta examensarbete användas för att generera de systemkrav som de plug-in eller tredjeparts-bibliotek behöver uppfylla för att slutprodukten ska passera de givna systemkraven. Detta examensarbete bygger på en transformationsprocedur som omvandlar kontrollflödesegenskaper på en beteendemässig form till en strukturell form. Kontrollflödes-egenskaperna fokuserar uteslutande på kontrollflöden i den meningen att de abstraherar bort all form av programdata och berör enbart anrop- och retur-händelser. Med beteendemässiga egenskaper syftar vi på egenskaper som berör exekverings-beteende och med strukturella egenskaper syftar vi på egenskaper som berör ordningen på instruktionerna i källkoden eller objektkoden. Resultatet i detta examensarbete tar denna transformationsprocedur ett steg längre och antar att vissa metoder (eller funktioner eller procedurer beroende på programmeringsspråk) är redan givna i formen av modeller som kallas flödesgrafer, medan resten av metoderna fortfarande är ospecificerade. Utdata blir då en mängd av strukturella restriktioner för de ospecificerade metoderna, som de måste följa för att en fulländning av den partiella flödesgrafen ska satisfiera den beteendemässiga formeln.
Kama, O. I. "Computer system for operational control of the optimal flow of the technological process." Master's thesis, Sumy State University, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86924.
Повний текст джерелаA computer system which controls the optimal flow of the technological process was created showing places of distortion.
Au, Lai Piu. "A simulation study of dynamic customer flow control in multi-site service system /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202002%20AU.
Повний текст джерелаIncludes bibliographical references (leaves 106-108). Also available in electronic version. Access restricted to campus users.
Song, Yang. "Design of secondary voltage and stability controls with multiple control objectives." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29714.
Повний текст джерелаCommittee Chair: Begovic, Miroslav; Committee Member: Deng, Shijie; Committee Member: Divan, Deepakraj; Committee Member: Harley, Ronald; Committee Member: Lambert, Frank; Committee Member: Shamma, Jeff. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Vacca, Andrea, and Ram Sudarsan Devendran. "A Flow Control System for a Novel Concept of Variable Delivery External Gear Pump." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200144.
Повний текст джерелаJaworski, P. "Cloud computing based adaptive traffic control and management." Thesis, Coventry University, 2013. http://curve.coventry.ac.uk/open/items/d63ba84e-bd0c-4e00-8242-310dbbaa3b92/1.
Повний текст джерелаSepúlveda, Toepfer Carlos. "Instrumentation, model identification and control of an experimental irrigation canal." Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/5951.
Повний текст джерелаThese water transport systems are difficult to manage and present low efficiencies in practice.
As a result, an important percentage of water is lost, maintenance costs increase and water users follow a rigid irrigation schedule.
All these problems can be reduced by automating the operation of irrigation canals.
In order to fulfil the objectives, a laboratory canal, called Canal PAC-UPC, was equipped and instrumented in parallel with the development of this thesis. In general, the methods and solutions proposed herein were extensively tested in this canal.
In a broader context, three main contributions in different irrigation canal control areas are presented.
Focusing on gate-discharge measurements, many submerged-discharge calculation methods are tested and compared using Canal PAC-UPC measurement data. It has been found that most of them present errors around ±10%, but there are notable exceptions. Specifically, using classical formulas with a constant 0.611 contraction value give very good results (error<±6%), but when data is available, a very simple calibration formula recently proposed in the literature significantly outperform the rest (error<±3%). As a consequence, the latter is encouragingly proposed as the basis of any gate discharge controller.
With respect to irrigation canal modeling, a detailed procedure to obtain data-driven linear irrigation canal models is successfully developed. These models do not use physical parameters of the system, but are constructed from measurement data. In this case, these models are thought to be used in irrigation canal control issues like controller tuning, internal controller model in predictive controllers or simply as fast and simple simulation platforms. Much effort is employed in obtaining an adequate model structure from the linearized Saint-Venant equations, yielding to a mathematical procedure that verifies the existence of an integrator pole in any type of canal working under any hydraulic condition. Time-domain and frequency-domain results demonstrate the accuracy of the resulting models approximating a canal working around a particular operation condition both in simulation and experiment.
Regarding to irrigation canal control, two research lines are exploited. First, a new water level control scheme is proposed as an alternative between decentralized and centralized control. It is called Semi-decentralized scheme and aims to resemble the centralized control performance while maintaining an almost decentralized structure. Second, different water level control schemes based on PI control and Predictive control are studied and compared. The simulation and laboratory results show that the response and performance of this new strategy against offtake discharge changes, are almost identical to the ones of the centralized control, outperforming the other tested schemes based on PI control and on Predictive control. In addition, it is verified that schemes based on Predictive control with good controller models can counteract offtake discharge variations with less level deviations and in almost half the time than PI-based schemes.
In addition to these three main contributions, many other smaller developments, minor results and practical recommendations for irrigation canal automation are presented throughout this thesis.
Ménard, Odette. "A solar climate control system using a water film flow to conserve energy in greenhouses /." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60540.
Повний текст джерелаA heat exchanger-storage system, using water as a thermal mass is included in the design of the Solar Climate Control system. A film of water flows on the inner surface of the roof and absorbs the direct solar heat radiation, acting then as a cooling agent. The energy absorbed may be reused for nighttime heating.
An efficient water dispersion pipe for the Solar Climate Control system was developed. The use of a soap solution rather than water alone for the Solar Climate Control water film system permitted a significant reduction in pumping rate and improved uniformity of the film.
A computer simulation model was run to determine the energy loads for both a conventional (double glazed roof) greenhouse and one equipped with the Solar Climate Control system. The Solar Climate Control system shows low operating cost and very good efficiency in heat removal.
Ma, Tsao-Tsung. "Use of multiple unified power flow controllers (UPFCs) to enhance power system operations and control." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366876.
Повний текст джерелаStröbel, Ulrich. "Development of an online analysis and control system for individual quarter milking systems." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2012. http://dx.doi.org/10.18452/16600.
Повний текст джерелаThe number of online-sensors in dairy farming is increasing. In this manner, important biologically changes in cows as for example changes in secretion can be detected at an early stage. But high mechanical strains on the teat tissue during milking still occur frequently and can for example lead to formation of teat rings. A suboptimal adjusted milking technology can be one of the reasons for the mentioned observations. The objective of this dissertation was to develop a vacuum control system for the teat-end vacuum that can react in short time intervals. The teat-end vacuum produced by that control system should be with constant low vacuum reduction in suction phase at high milk flows. Moreover, in release phase the control system should provide constantly high vacuum reductions. In wet-tests (ISO 6690, 2007) several individual quarter milking systems in laboratory and practical milking parlours were evaluated in terms of their associated teat-end vacuum conditions. Several vacuum measuring and actuator systems for controlling the vacuum were tested. The most important result of the studies was that the general concept for a teat-end vacuum control system was developed, and a prototype of that system was produced. Important requirements for an optimum teat-end vacuum were revealed during that work. The concept for the planned vacuum control system suggests that it is possible to reduce the mean teat-end milking vacuum in the suction phase to 20 kPa at a flow rate of 0.25 l/min per udder quarter. At higher flow rates of 1.5 l/min and more per udder quarter, the teat-end vacuum is similar to the machine vacuum with a mean value of approximately 30 kPa. Therefore, for the first time, it is possible to supply a high teat-end vacuum at a high and a low teat-end vacuum at low milk flow rates. In the future, the developed vacuum control system should be adapted for installation in all types of individual quarter milking systems.
Wu, Changhong. "Control of slurry flow, temperature and aggressive diamonds in chemical mechanical planarization." Thesis, The University of Arizona, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3701786.
Повний текст джерелаThis dissertation presents a series of studies related to the study and control of slurry flow, process temperature, and aggressive diamonds in Chemical Mechanical Planarization (CMP). The purpose of these studies is to better understand the fundamentals of CMP and to explore solutions to some of CMP’s greatest challenges.
Within-wafer removal rate non-uniformity (WIWRRNU) is a critical parameter to determine film thickness planarity on a wafer-scale level and it grossly impacts yield. Resolving this issue continues to be an area of intense focus in the industry. The first study in this dissertation shows the feasibility of adopting a new method to improve WIWRRNU during copper CMP that is solely based on intentional local temperature manipulation of the pad. A pad surface thermal management system is developed to locally change pad surface temperature. This system consists of one or more thermal transfer modules contacting the pad surface. In this study, the system is employed to adjust the “center-fast” copper removal rate profile to illustrate its effect during the process. Results shows that, when two thermal transfer modules are employed, local removal rates in the wafer center region decrease significantly while maintaining the removal rates near the wafer edge thereby significantly improving WIWRRNU.
Another contribution of this dissertation is the investigation of the effect of pad groove design on slurry injection scheme during interlayer dielectric CMP. A novel slurry injector with multiple slurry outlets is designed, which provides optional slurry injection schemes (i.e. one injection point scheme and multi-injection point scheme). These schemes are compared with the standard slurry application method on a concentrically grooved pad and an xy-groove pad, respectively. On the concentrically grooved pad, the one injection point scheme generates significantly higher oxide removal rates (ranging from 22 to 35 percent) compared to the standard slurry application method at different slurry flow rates. On the xy-groove pad, the one injection point scheme still results in higher removal rates (ranging from 3 to 9 percent), however, its removal rate enhancement is not as high as that of the concentrically grooved pad. In order to further improve slurry availability on the xy-groove pad, the multi-injection point scheme is tested. Results show that the multi-injection point scheme results in significantly higher removal rates (ranging from 17 to 20 percent) compared to the standard slurry application method. This work underscores the importance of optimum slurry injection schemes for accommodating particular groove designs.
The last contribution of this dissertation involves a study regarding aggressive diamond characterization and wear analysis during CMP. A 3M A3700 diamond disk is used to condition a Cabot Microelectronics Corporation (CMC) D100 pad for 30 hours. The top 20 aggressive diamonds for two perpendicular disk orientations are identified before the polishing, as well as after 15- and 30-hour polishing. The furrow surface area generated by these top 20 aggressive diamonds and their evolution are analyzed and compared. Results show that the original top 20 aggressive diamonds identified before polishing are subjected to wear after the first 15-hour polishing as the furrow surface area that they generate decreases dramatically (by 47%). As these original aggressive diamonds are worn, seven new aggressive diamonds are “born” and join the new top 20 list for both disk orientations. After the second 15-hour wafer polishing, the furrow surface area of these new top 20 aggressive diamonds do not change significantly. The furrow surface area created by all the active diamonds exhibits the same trend as the top 20 aggressive diamonds, confirming that most pad conditioning work is performed by these aggressive diamonds and that the disk loses its aggressiveness in the first 15 hours of polishing and then maintains its aggressiveness during the second 15 hours, albeit to a lesser extent.
Andersson, Henrik. "Model Based Control of Throttle, EGR and Wastegate : A System Analysis of the Gas Flows in an SI-Engine." Thesis, Linköpings universitet, Fordonssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140533.
Повний текст джерелаDunn, Jason. "ON THE NATURE OF THE FLOW IN A SEPARATED ANNULAR DIFFUSER." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4101.
Повний текст джерелаM.S.A.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Aerospace Engineering MSAE
Kabir, Md Nayim. "Smart coordinated distribution system control to enable high level penetration of rooftop PVs." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/79956/1/MD%20Nayim_Kabir_Thesis.pdf.
Повний текст джерелаDahlin, Hampus, and Martin Pihl. "Factors that Impact Inventory Levels in a Supermarket System Supplying a Manufacturing Line." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-24069.
Повний текст джерелаWamalwa, Fhazhil. "Optimal control of a conventional hydropower system with hydrokinetic/wind powered pumpback operation." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/61549.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2017.
MasterCard Foundation Scholars Program
Centre of New Energy Systems
University of Pretoria
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
Sarasua, Wayne Alexander. "SIG-GIS : a GIS based traffic signal coordination and information management system." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/19085.
Повний текст джерелаHussein, Ahmed Abd Elmonem Ahmed. "Dynamical System Representation and Analysis of Unsteady Flow and Fluid-Structure Interactions." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/85626.
Повний текст джерелаPh. D.
We present modeling approaches of the interaction between flying or swimming bodies and the surrounding fluids. We consider their stability as they perform special maneuvers. The approaches are applied to rotating blades of helicopters, fish-like robots, and micro-air vehicles. We develop and validate a new mathematical representation for the flow generated by moving or deforming elements. We also assess the effects of fast variations in the flow on the stability of a rotating helicopter blade. The results point to a new stable regime for their operation. In other words, the fast flow variations could stabilize the rotating blades. These results can also be applied to the analysis of stability of rotating blades of wind turbines. We consider the effects of flexing a tail on the propulsive force of fish-like robots. The results show that adding flexibility enhances the efficiency of the fish propulsion. Inspired by the ability of some birds and insects to transition from hovering to forward motion, we thoroughly investigate different approaches to model and realize this transition. We determine that no simplification should be applied to the rigorous model representing the flapping flight in order to model transition phenomena correctly. Finally, we model the forward-swim dynamics of psciform and determine the condition on the center of mass for which a robotic fish can maintain its stability. This condition could help in designing fish-like robots that perform stable underwater maneuvers.
Muse, Jonathan Adam. "An H-Infinity norm minimization approach for adaptive control." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34830.
Повний текст джерелаWredh, Simon. "Neural Network Based Model Predictive Control of Turbulent Gas-Solid Corner Flow." Thesis, Uppsala universitet, Signaler och system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-420056.
Повний текст джерелаUpadhyay, Devesh. "Modeling and model base control design of the VGT-EGR system for intake flow regulation in diesel engines /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486400446370507.
Повний текст джерелаWang, Chia-Chuan, and 王嘉傳. "A gas flow control system integrating MEMS flow sensor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/17698419680003583299.
Повний текст джерела國立交通大學
工學院半導體材料與製程設備學程
101
Gas control in the electronics industry and the semiconductor manufacturing are very important key process. Commonly in gas flow control system the key product is use mass flow controller to control flow rate generally called MFC (Mass Flow controller).Mass flow controller is combined the flow sensor, proportional valve, PID controller device, but when any device needs to re-calibration or maintenance and change the specifications in the production line or re-design will cause a trouble and inconvenience. This thesis focused on use new generation of MEMS fabrication process flow sensor to replace the traditional thermal flow sensor, and introduce how to combine independent proportional valve, PID controller, PLC and HMI to do a like MFC function flow control system. Because each component are independent modular system, so not only more convenient to maintenance and calibration, and via the independent modular components can be separately applied to various gas flow control system, and can be effectively used in industrial equipment.
Chun-Chen, Lin, and 林俊臣. "Control of A Gas Flow Calibration System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/81003939859308915658.
Повний текст джерела中原大學
化學工程研究所
86
The fluid transients caused by the enormous change of flow rate may be harmful to the piping system. The main purpose of this research is to discuss the fluid transients of a gas flow calibration system. Mathematical models of the fluid transients were derived by the principle of mass and momentum balance. The characteristic method was applied for numerical analysis. The simulation studies on the fluid transients of the calibration system were executed by this method. The effects of different operating conditionson the fluid transients were investigated in the simulation studies. PI control law was proposed to implement to the pressure and flow rate control of calibration system. The controller settings were obtained by the continuous cycling method and then fine-tuned using the IAE criterion. Simulation results show that the pressure and flow rate of the system would change enormously by some operating conditions such as the time of valve closing. The changes of the pressure or flow rate during the transient are larger for theshorter closing time. Since the pressure of the system is sensitive to the valve opening , control of pressure would be more difficult than that of flow rate. And the results show that the controlled point nearest to the valve have the best control performance of flow rate in the single pipeline system.
Hsin-Chang, Cheng, and 鄭信彰. "Control of A Liquid Flow Calibration System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/31410790966283955790.
Повний текст джерела中原大學
化學工程研究所
86
The fluid transients caused by the enormous change of flow rate maybe harmful to the piping system. The flow and pressure process in a liquid flow calibration system have highly interaction. The selection of the controlled point of pressure could have large effect on the control performance. The main purpose of this research is to concern the related topics smoothing the operation of the calibration system. Mathematical models of the fluid transients were derived by the principle of the mass and momentum balance. The characteristic method is applied for numerical analysis. The simulation studies on the fluid transients of the calibration system were executed by this method. A steady state equation governing the flow and pressure relation was also derived for the control purpose. Simulation results show that the elapsed time of the valve closing have the great effect on the fluid transients. The increase of the pressure during the transients is larger for the shorter closing time. It shows that the controlled point of pressure nearest to the closing valve have the best control performance. A decoupler was applied to reduce the interaction between the flow and pressure control loop.
Li, Hsun-ming, and 李訓明. "Traffic flow control strategy on freeway system." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/43468138879860120815.
Повний текст джерела國立成功大學
交通管理(科學)學系
84
Congestion is nowadays one of the main problems on freeway system.Reduction of congestion is a main objective not only for insuring shortingand more reliable travel times, but also in reducing its indirect consequenceson pollution and fuel consumption thus improving the quality of life. System limit control deserves the most efficient one that has beenapproved to be appropriate for traffic congestion conditions in foreigncountries. This paper accordingly tries to develop a traffic density controller to eliminate the traffic congestion. The macroscopic traffic model adopted in this paper will be introducedto domestic people. A traffic density controller is improved which is proposedfirst by C.C.Chien , Y.Zhang, A.Stotsky. The traffic controller is designed tooperate traffic system in a desired traffic density to prevent the amplification of traffic congestion. We proposed the density rules to set the density goals to cooperate with the density controller. Finally, we collected the traffic flow characteristics that are createdfrom the traffic data on domestic freeway system to fit in the adopted macroscopic traffic model. From the simulation of difference traffic situation: close partly lane, close fully lane, upper grade lane, we can see the traffic congestion has been eliminated by the proposed density controller.
Chen, Chen-Jen, and 陳昶任. "Cross-Platform Integrative, journalistic Flow Control System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/46427531747320958368.
Повний текст джерела國立交通大學
資訊科學系
91
Today is global information explosion and newsmedia is the results by which huge information is filtered. Journalistic competition is more serious and all newsmedia want to achieve the goal, which is increasing news source, high up news determinacy and value, and costing down investigative report and edit. Cross-Platform Integrative, journalistic Flow Control System is a newsmedia processing system. All kinds of huge source is processed more streamlined and more cost-efficient based on gatekeeper theory to news content. These source include news group, mobile content, voice content, web system and XML system etc. All news content will be rewrite base on different platform and it will down operating cost. Besides, single time point news content can be translated to tracking news content by history search. Finally, re-evaluate system worked with these processing system will help newsman more professional on news content, and help newsmedia organization to evaluate news employee in impersonal point and some dimensional rule. This thesis consists of three major parts: (1) We describe today''s newsmedia, including newspaper, radio, television and network media. By introducing newsmedia, we picture system structure and how newsman can work together with this system. (2) We introduce what is gatekeeper theory at first. And then we physically exercise how news source process to news content cooperating by reporter, editor and master editor, and how to store content in XML way and publish to browser. (3) We outline system conditions and our acquaintance about this system. We also describe possible future work.
Tu, Chih-Chien, and 杜志乾. "Production Control Policies in Flow Shop Manufacturing System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/40642384806738851049.
Повний текст джерела國立清華大學
工業工程與工程管理學系
89
The paper tries to investigate and compare three production control policies, HP production control policy, zero production control policy and (z, Z) production control policy, in flow-shop manufacturing system. A HP production control policy is characterized by a number z*, which is regarded as the optimal amount of inventory to be kept. If current inventory level exceeds z*, the system be set to produce nothing;if less than z*, the system should be set to produce at the maximum rate;if the inventory level exactly equals z*, the system should be set to produce exactly enough to meet demand and thereby keep the inventory level at z*. A zero production control policy is also characterized by a number z* which is regarded equal zero. A (z, Z) production control policy is characterized by two control limits z < Z. The machine keeps on producing at its maximal capacity until the inventory level Z is reached. Once this inventory level is reached, we adjust the production rate of the machine to zero until the inventory level z is reached. We find that (z, Z) production control policy is better than zero production control policy in many cases. For example, in case that the capacity far more exceeds the demand, the usual belief is that zero production control policy can lower total cost. However, our simulation experiment results show that (z, Z) production control policy is better than zero production control policy. In case that the demand is close to the capacity, HP production control policy will be better than the other two policies. The simulation to estimate the expected inventory & shortage per unit time and to estimate the (z, Z) values for (z, Z) production control policy is based on that we model the unreliable single machine system in a renewal process. 一、製造系統或生產線的類型…………………………………………………..1 二、製造系統或生產線的生產控制策略問題…………………………………..1 三、本論文研究之製造系統及問題……………………………………………..2 四、本文章節架構………………………………………………………………..2 第貳章 生產控制策略文獻回顧及本文研究目的、方法及步驟…………………3 一、生產控制策略文獻回顧……………………………………………………..3 (一) HP production control policy……………………………………………..3 (二) 零庫存式之生產控制策略…………………………………………… ..6 (三) (z, Z) production control policy…………………………………………..8 二、研究目的、研究方法及步驟………………………………………………..9 第參章 三種生產控制策略在單機台系統之數學模型…………………………..11 一、系統共同環境…………………………………..…………………………..11 二、生產控制策略之比較模型……………………..…………………………..11 (一) HP production control policy模型……………………………………...13 (二) 零庫存式之生產控制策略模型……...…….………………………….14 (三) (z, Z) production control policy……...…….……...…………………….15 第肆章 單機台 (z, Z) 生產控制策略…...…….……...…………………..…...….17 一、(z, Z) 生產控制策略對存貨水準影響之觀察……...……………..…...….17 二、估算 (z, Z) 值之模擬方法……...…………………………..……..…...….19 (一) Check Method(對每組數據,檢驗 時間內的當機次數)…………20 (二) 計算每組數據之 …...……………………..…………..……..…...….23 (三) 計算每組數據之存貨數與缺貨數…………..………..…….....…...….26 三、實例演練……...……………………………….……………..……..…...….33 四、使用eM-plant 軟體,對此模擬方法之驗證…….……………..……..….35 第伍章 模擬驗證、比較與分析 …….…………..………………………..…..….37 一、HP control policy之 z* 值之驗證……..………………………..……..….37 二、三種生產控制策略之比較……..…………………..………………..…..….40 第陸章 研究貢獻與未來可進行研究之方向……………..……………..…….….43 一、研究貢獻…….…………..………………………..…..…………..…………43 二、未來可進行研究之方向……………………..…..………………………..…43 第柒章 參考文獻…….…………..………………………..…….…………………45 第捌章 附錄………………………………………………………………………..47 附錄一:模擬方法之程式碼……………………………………………………47 附錄二:單機台HP production control policy 程式碼………………………57 附錄三:單機台每天存、缺貨紀錄程式碼……………………………….……58 附錄四:(z, Z) 生產控制策略之程式碼……………………….………….……59
LIAO, CHIEN CHIH, and 廖建智. "Some Flow-control Techniques for IC Manufacturing System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/32099402359852761549.
Повний текст джерела東海大學
數學系研究所
86
This thesis is the continuation of a series research which intendsto create a scientific, long term evaluation of IC manufacturing systems.Three flow-control techniques have been designed to reduce the returnpercentage of wafers in process when their allowed waiting times are over.These techniques also greatly increase the throughput of the products.Technique C which based on estimated time schedule to decide wafer dispatchpriority for each step is untraditional and unique. It is simple and easy to apply on IC production line.-1 -aSome Flow-control Techniques for IC Manufacturing System