Дисертації з теми "Controlled rolling"
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Wang, Kai. "A study of HSLA steels microalloyed with vanadium and titanium during simulated controlled rollling [i.e. rolling] cycles." Thesis, University of Canterbury. Mechanical Engineering, 2003. http://hdl.handle.net/10092/7521.
Повний текст джерелаPatel, Jitendra Kumar. "The controlled hot-rolling of HSLA steels to optimise properties." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547855.
Повний текст джерелаBozgeyikli, Evren C. "Introducing Rolling Axis Into Motion Controlled Gameplay As A New Degree Of Freedom Using Microsoft Kinect." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614606/index.pdf.
Повний текст джерелаVishal, Vaibhaw 1978. "Plastic buckling in gas transmission line-pipes, cold formed from thermo-mechanically-controlled rolling of low-allow steel plates." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40359.
Повний текст джерелаIncludes bibliographical references (leaves 157-164).
The need for energy infrastructure has led to transportation of gases over long distances. The strength-grade of pipeline steels used for transportation of gases has been increasing to reduce the cost of the overall pipeline system. Along with higher strength, adequate fracture toughness and resistance to plastic buckling are required of pipes installed in earthquake- or frost-prone regions. To get higher strength with adequate deformability in low-alloy pipeline steels, plates for pipes are typically made today by thermo-mechanically-controlled rolling processes, which introduce strong crystallographic texture and anisotropy in the pipes. The plates are then cold-formed into pipes, which introduces further anisotropy and residual stresses in the pipe. In the current work, effects of various steps of the pipe manufacturing process, such as rolling, cold forming, etc., on residual stress, hardening moduli, plastic anisotropy, and eventually, to the buckling resistance of the pipe, are studied. Effects of various types of geometric perturbation on plastic buckling response of pipes are also studied.
(cont.) Due to the crystallographic texture and cold-forming, crystal plasticity-based constitutive models instead of Mises plasticity-based constitutive models may be better suited to model the pipe. In the current work, crystal plasticity-based material models are used to predict the buckling response of pipes. Results show that the buckling strain in uniaxial compression, predicted using a crystal plasticity-based model, is - 20% less than the one predicted using an "equivalent" Mises plasticity-based model, for a pipe with d/t ratio of 51. Further results show that variation in material properties and residual stresses caused by cold forming reduces the buckling strain by - 30%, for a pipe with d/t ratio of 51.
by Vaibhaw Vishal.
Ph.D.
Liu, Jingrong. "Design and Analysis of Intelligent Fuzzy Tension Controllers for Rolling Mills." Thesis, University of Waterloo, 2002. http://hdl.handle.net/10012/848.
Повний текст джерелаIngelstrand, Kristina, and Rebecka Klasson. "Business controllern : Digitaliseringens influenser på rollen." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23991.
Повний текст джерелаDenna studie syftar till att undersöka och bedöma hur business controllerns roll och arbetsuppgifter influeras av digitaliseringen. Studien ska ge teoretiker och praktiker en större insikt kring vilka krav, kompetenser, erfarenheter, arbetsuppgifter och förväntningar som faller på controllern i en digital värld. Controllerns huvudsakliga arbetsuppgift är i grunden analys, kommunikation, rapportering, hantering av data samt prognostisering. Det finns potentiella hjälpmedel för att detta ska genomföras effektivt. Vi är mitt uppe i en digital revolution. Detta för med sig förändringar och det kräver viljan av anpassning och utveckling. För att lyckas driva en verksamhet krävs planering, strategi och kvalificerad personal. Det kräver att kunskap finns men också rätt förutsättningar på arbetsplatsen för att uträtta arbetet. I och med de analytiska och tekniska verktyg som idag finns tillgängliga, kan controllers bli en ovärderlig resurs om dessa kan bemästra verktygen och lära sig att tolka och förstå den information som IT-system kan tillgodose. Studien grundar sig på teori kring digitalisering, controllerns roll samt rollteori. Empiri har samlats in genom 50 platsannonser samt fem intervjuer. Genom granskning av empiri och teori samt en analys kring detta material kunde förståelse skapas kring hur controllerns roll och arbetsuppgifter influeras av digitalisering. Specifikt i vilken utsträckning controllern använder sig av digitala verktyg och vilken efterfrågan företag har på controllers digitala kompetenser och erfarenheter. Det ges även en insikt i vilken roll samt vilka förväntningar som faller på controllern i en digital värld. Slutsatsen av denna studie är att controllers använder sig av digitala verktyg i bred utsträckning. Vilket i sin tur ställer krav på digitala erfarenheter och kompetenser. Den digital revolutionen kan anses vara ett faktum vilket för med sig ett krav på att controllern ska beakta och följa med i den digitala utvecklingen och förändringen. I platsannonserna påvisas tydlig tendens att digital erfarenhet och kompetens är en stor del av det som efterfrågas från företag. Trotts den höga efterfrågan på digital kompetens visar granskningen av platsannonser att företag fortfarande enbart efterfrågar en person med ekonomisk utbildning. Rollen som controller har gått från att vara en “styrekonom” och revisor till att rollen nu befinner sig i ett gränsland mellan IT och ekonomi. Vilket för med sig att rollen nu kan anses vara något av en hybrid. Dock visar empirin i denna studie att detta ännu inte ses helt i praktiken.
Johannesson, Lisa, and Emma Persson. "Controllerrollen : en ökad förståelse för rollen inom stora svenska företag." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14398.
Повний текст джерелаThe role of a controller has existed within organizations since the beginning of the 20thcentury, but it has developed substantially over time. The controller initially had an accountant role and now they have an increasingly business oriented and analytical function within business organizations. In the 1930s, this drastic change of function in the role occurred by the Controllers Institute of America (CIA), which resulted in the controller getting a more analytical role. Within companies in Sweden and across Europe, the controller concept developed in the 1970s. However, the role of a controller still lacks a clear definition and the content in the role varies substantially across different business organizations. There are also many different types of controllers, which increases the role variation. The objective of this study is to increase the knowledge of the role of a controller; by studying which tasks and expertises that are included in the profession, the differences between companies and whether there is a difference between how the controller himself/herself and the others within the organizations define the role of a controller. The study is conducted with a qualitative study with an abductive approach. The empirics are collected via semi structured interviews with both controllers and related roles. The study was conducted by means of ten interviews across five different companies, of which seven interviews with controllers and three interviews with related roles. The controllers were categorized as three different types of controllers based on their duties and responsibilities; the analysts with elements of accountants, the accountant with elements of analysts and the mix of analyst, educator and coach. A noticeable difference in the role was noted between companies depending on their size and how their reporting is designed, but no major differences depending on industry. Finally, we concluded that the interviewed controllers and the related individuals largely agreed on controller role content in general as well as within each respective company.
Wadström, Samuel, and Erik Engstrand. "Ekonomistyrning utan budget : Controllern och budgetering i kontrast till Beyond budgeting." Thesis, Linköpings universitet, Företagsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166716.
Повний текст джерелаBackground: Conventional budgeting has endured a lot of criticism in the last decades as many argue it is not suitable for today's agile and globalized market. Several organizations have taken the step to abandon conventional budgeting and the movement, or philosophy, regarding this matter is known as Beyond Budgeting (BB). The core principle of this philosophy are an organizational structure where a higher degree of responsibility and trust is placed on the operative sections of the organization. By doing this a much higher degree of liberty is granted to partners in the organization, but it raises questions regarding agent theory and organizational control. The traditional role of the controller has been to function as a tool for upper management to exercise control and counteract the moral hazard of agency theory. The question then is how this role is affected by a much less strict form of control, and which factors can be seen to affect the role as well as which factors that have already affected it. Purpose: The purpose of the study is to examine the role of the controller and how budgeting of modern organizations are handled as well as how the accurate the critique aimed at budgeting is, as it is described by the philosophy of BB. Furthermore, the study aims to examine to which degree the subject organizations has implemented or embraced the principles of BB. Method: The study is built on semi-structured interviews with a total of six participants, based in several organizations, which have acted as the empirical data. This data has been transcribed and analyzed in accordance with the studies’ deductive approach upon which our studied theories have been applied. The analysis has been based on a thematic analysis where the goal has been to find common themes and categories. Conclusion: The study has found that controllers today have a high degree of control regarding how they choose to perform their work, which has been found to be primarily analytical and forward-looking in nature. Some of the controllers consider themselves to have a decision-making role, and while their work is primarily done alone, they have a wide array of contacts. The role can to a degree be described as a business partner, but the study has found large differences among participants in this regard. Among the participants it was most common to use a conventional budget, set by upper management where local business units have limited influence. This budget was complemented with forecasts. The study also found that among the participant’s organizations, some of the critique towards conventional budgeting was accurate to a certain degree. In addition, we found that aspects of BB had been implemented.
Wallin, Victor, and Niklas Wentzel. "Vem är controllern? : En kvalitativ studie om controllern i rollen som styrorienterad och traditionell ekonomichef." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15501.
Повний текст джерелаAbstract There are many definitions of what the profession controller imply, which indicates that the profession is difficult to define. The purpose of this study is to describe the controller's job role in medium-sized manufacturing companies within the private sector and if the controller’s role focuses more on controlling-oriented tasks or more on traditional business tasks. Therefore we enunciated the following framing of question: Is today’s controller in manufacturing companies more controlling-oriented or more a traditional chief financial officer? We chose to conduct a qualitative study because it enables a deeper understanding and then we chose a deductive approach where we went from theory to empiricism. In our theoretical framework we described various characteristics, skills, roles and ways of working as part of the controller's profession. Our empirical study involved personal interviews with five controllers, which were supplemented by a survey where the respondents ranked their tasks in relation to time. The result shows that we can’t demonstrate that the controller works with more controlling-oriented tasks or more with traditional business tasks, but we believe that the controller works with both controlling-oriented- and traditional business tasks. Keywords: Controller, Role, Chief financial officer, Controlling-oriented
Ferreira, Henrique Cezar. "Geração de referências para as malhas de controle de um laminador de tiras a frio." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-10122004-004129/.
Повний текст джерелаSetup generation systems for cold mill control loops have provided rolling mill operation with high levels of quality and productivity. In case of malfunctioning in the process unit responsible to execute the setup generation system, the normal procedure for the operation of the mill is interrupted, being necessary the use of an emergency operation mode. This work develops an alternative system for references generation which aims to replace the current emergency operation mode based on pre-calculated, not continuous, setup tables for the rolling mill. The developed references generation system, like the normal system used during mill operation, is composed by a cost function which evaluated the mill quality and productivity operation level which a set of references may propose. The cost function is minimized using the Nelder and Mead simplex method and the process variables involved in the cost function are evaluated by a cold rolling mill model composed only by algebraic equations, while the normal operation system uses a classical model, made up by integrals and algebraic equations. Comparing the existing main setup system to the developed reference system it was observed that, despite its simplicity, less accuracy and less robustness, references calculated using this system were accurate enough to achieve better results than the one emergency table mode has provided.
Cehaja, Lundqvist Carina. "Rollen som verksamhetscontroller i statliga myndigheter." Thesis, Linnéuniversitetet, Institutionen för organisation och entreprenörskap (OE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-59678.
Повний текст джерелаIn literature and research the definition of a controller is an economist working with financial control. According to my knowledge this is not correct for controllers focused on operations management in government agencies The purpose of this thesis is to increase the knowledge of the role as a controller focused on operations management in state agencies. The questions to be answered are what demands does government agencies have when they recruit operations management controllers and how do they describe the assignments? What is included in the four month follow ups? The method has been by discourse analysis study the content in the four month follow ups at the National Board of Health and Welfare, the National Board of Institutional Care and the Swedish Customs. In the thesis the agencies recruitment ads for controllers focused on operations management is also analyzed. The conclusion is that the assignments for controllers focused on operational management on the agency-wide level is similar between the agencies and few financial assignments are included. The assignments for the lower levels differ within and between the agencies and financial assignment are not included. The controllers at the agency-wide level seem to have different mandates between the agencies. The agencies demands for education and experience varies widely and some of the ads have demands for a background in finances. My conclusion is that the controller at the department level is under development and the role at the agency-wide level is more distinct.
Novaes, Gilberto de Oliveira. "Modelagem e controle de velocidade e tensão de um laminador de encruamento." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-12082010-163315/.
Повний текст джерелаThis work is an introduction to the evolution of the processes of cold rolling, drive and control, focusing on skinpass rolling. The main objective is to establish a model of linear drive systems, allowing the design of a multivariable control. It is intended that the robustness of multivariable control contributes to the elimination of defects associated with processes of coiling and uncoiling. The elimination of these defects poses a great economic return due to the large volume of production of these facilities. To achieve this deal it was developed a mathematical model of the complete system. Nonlinearities associated with variation in diameters and inertia reels in desenroladeira and reel are evidenced in the model. To solve this problem the terms containing nonlinearities were removed from the model and, subsequently reintroduced by feedforward control loops. To validate the model, PID controllers were designed in a similar way to those used in real mill. With the results obtained by simulation, we discuss the validity of the model by comparing them with the actual process data. From this model it was developed a linear state space model to be used in the design of robust multivariable controller. After that it was developed the design of this multivariable controller using the technique LQG / LTR. Finally, it was discussed the simulation results, comparing them with actual data of the plant. Overall, the results point to a good approximation of the real plant and the proposed model.
Henttu-Aho, T. (Tiina). "The emerging practices of modern budgeting and the role of controller." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214399.
Повний текст джерелаTiivistelmä Perinteisen vuosibudjetoinnin valta-asemaa johdon ohjausjärjestelmien kulmakivenä on alettu kyseenalaistaa viime vuosina. Budjetoinnin uudet kehityssuuntaukset näyttäisivät joko korvaavan tai täydentävän vakiintunutta budjetointikäytäntöä organisaatioissa. Tämä väitöskirja tarjoaa kokonaisvaltaisen kuvan uusista käytännöistä, sekä niiden vaikutuksista johdon laskentatoimen työhön. Väitöskirja tutkii budjetoinnin eri tehtävien pirstaloitumista sekä sitä, miten controllerin rooli ja uudet budjetointikäytännöt voivat toimia toisiaan täydentävästi. Väitöskirja muodostuu neljästä toisiinsa liittyvästä esseestä, jotka tuovat laadullisen tutkimuksen keinoin esille, kuinka vakiintunut käytäntö, kuten budjetointi, muuttuu, ja mitä vaikutuksia tällä muutoksella on budjetoinnin eri tehtäviin. Tutkimus tarjoaa myös käsityksen siitä, miten kontrollerit muodostavat kokonaiskuvan budjetoinnillisesta ohjausjärjestelmästä ja tuottavat uutta laskentatoimen informaatiota. Tämä väitöskirja kuvaa budjetoinnin muutosta käsitteellä pirstaloituminen (fragmentation). Se voidaan määritellä järjestelyksi, jossa uutta, erilaisten ohjausmenetelmien yhdistelmää käytetään palvelemaan budjetoinnin eri tehtäviä, ja jossa yksittäinen budjetointiprosessi joko korvautuu tai täydentyy muilla ohjausmekanismeilla. Tämä käsite tarjoaa yhteisen nimittäjän viimeaikaisille budjetoinnin kehityssuuntauksille, mutta auttaa myös ymmärtämään paremmin budjetoinnin eri variaatioita. Budjetoinnin pirstaloituminen hämärtää budjetointijärjestelmän rajat, mutta mahdollistaa myös joustavuuden suunnittelun järjestelmään itsessään. Kontrollerin roolin näkökulmasta budjetoinnin pirstaloituminen merkitsee budjetoinnin eri menetelmien välisten yhteyksien koordinointia, laajempaa kommunikaatiota ja vuorovaikutusta organisaation eri toimijoiden kanssa, uusien liiketoimintaorientoituneiden taitojen lisääntymistä sekä ammatillisen roolin korostumista laskentainformaation realismin parantamisessa budjetoinnin lateraalisessa suunnitteluprosessissa
Pires, Carlos Thadeu de Ávila. "Sistema de otimização e adaptação para a geração de referências em um laminador de tiras a frio." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-09012008-172137/.
Повний текст джерелаThis work begins describing the main rolling theories which have been employed during the recent years, in order to achieve the ideal conditions for the operation of tandem cold rolling mills. These optimum conditions are connected to a set of references used by the main systems regulators, aiming at getting the best quality of the strip and the maximum productivity of the mill. The main contributions of this thesis are: (i) proposal of a new non-iterative procedure to initial reduction calculation for each stand of a tandem cold mill, based on the iterative beta factor algorithm introduced by R.M. Guo; (ii) Use of Bland and Ford model for roll force and roll torque calculation, starting from the initial reduction schedule proposed by the non-iterative initialization algorithm and optimized by the Nelder and Mead method. The contribution of this thesis for this optimization phase consists in its proposal for an objective function to be minimized. This objective function takes into consideration the main product quality and process productivity attributes, i.e., thickness, flatness and the use of maximum available power, evenly distributed among all stands; (iii) finally, aiming at ensuring maximum precision for the model predictions, it is proposed an optimization algorithm to be used by an adaptation strategy, considering the difficulties to estimates two main rolling mill process variables: friction and yield stress coeficientes. Results extracted from an industrial four stand tandem cold mill, on which some of the proposal theories were implemented, are presented and discussed.
Odenbrink, Viktor, Viktor Johansson, and Louis Perikala. "Controllerrollen inom den offentliga sektorn : En kvalitativ intervjustudie om vad det innebär att vara controller inom den offentliga sektorn och vilka arbetsuppgifter och egenskaper som är relevanta för rollen." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-54245.
Повний текст джерелаAbstract Bachelor Thesis in Business Administration School of Business and Economics, Linnaeus University, Växjö 2016 Authors: Viktor Odenbrink, Louis Perikala, Viktor Johansson Supervisor: Tom Karlsson Title: The role of a controller within the public sector Background: There are many studies on the role of controllers within the private sector, studies in the private sector focus on the work assignments and characteristics that are relevant for a controller as well. However, there are different opinions and interpretations regarding the role of controller in the public sector, some studies say that the roles differs while other researchers state that the roles are similar in both sectors. Our goal with this study is to shed light on what it means to be a controller within the public sector and the work assignments and characteristics that are relevant to the role. Purpose: The purpose of this study is to describe what it means to be a controller within the public sector and the work assignments and characteristics that are of importance. This is to create more knowledge about the role of a controller within the public sector. Method: A qualitative research approach has been the basis for this study. The research is seen as a qualitative interview. The empirical data has been collected through semi-structured interviews with controllers and economists with similar duties as a controller within the public sector. Conclusion: The big difference in what it means to be a controller within the public and private sector is that a controller within the public sector emphasizes the need to be involved in the contribution to the welfare and social benefits. The work assignments and characteristics are difficult to place in a specific segment and this points towards a so called hybrid role, which means that the controller should have elements from all the segments which include the role of an accountant, the analytical role, the pedagogical role and lastly the so called coaching role. Keywords: Public sector, controller, work assignments, characteristics
"Nanocars: Towards photoactive, directionally-controlled surface rolling molecules." Thesis, 2010. http://hdl.handle.net/1911/62213.
Повний текст джерелаWANG, ZHI-YONG, and 王智永. "On mechanical and joining properties of controlled rolling re-bars." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/78159790985327523241.
Повний текст джерела國立臺灣大學
材料科學與工程學研究所
86
The fabrication technology of controlled rolling re-bar was introduced from Europe, Since controlled rolling re-bars with lower cost conform conventional high strength re-bars standard(ASTM A706), it is much widely used. The object of this article is to examine the mechanical properties, and the results could be a referenc for revising re-bar standards. It is observed that the exterior structure of controlled rolling re-bar is tempered martensite, a decomposed martensite with carbides size of about 0.2■m, while the interior structure is pearlite plus ferrite structures. The controlled rolling re-bars revealed similar tensile strength while exhibited higher yield strength compared with ordinary ones, thus resulting in lower tensile to yield strength ratio. After the 180 degree bending test, there were no microcrack at it''s tensile stressed surface region. Regard the joining of re-bars, the strength of the controlled rolling re-bars doesn''t lowered after mechanical joining; the strength of the controlled rolling re-bars did decrease after gas joining which is about 10% lower than initial controlled rolling re-bars. It is recommended that mechanical joining should be employed for joining the controlled rolling re-bars while gas joining could be used for conventional high strength re-bars.
Liu, Zhengdong. "Experiments and mathematical modelling of controlled runout table cooling in a hot rolling mill." Thesis, 2001. http://hdl.handle.net/2429/13758.
Повний текст джерелаLi, Deping. "Servo controlled swash plate axil piston pumps operating under variable load demands with application to rolling mills." Thesis, 2003. http://spectrum.library.concordia.ca/2316/1/MQ83883.pdf.
Повний текст джерелаRoccisano, Anthony Joseph. "Manufacturing Processes Leading to Improved High pH SCC Resistance in Pipes." Thesis, 2020. https://hdl.handle.net/2440/136307.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2020
Hwang, Cheng-Yuan, and 黃振原. "Developing Simulator for Hot Rolling during Finishing Mill Process and FeedForward Controller Law." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/61487867054907840896.
Повний текст джерела元智大學
機械工程研究所
87
This paper presents a study for developing a simulation system for hot rolling during finishing mill process based on graphic user interface. The simulation system is developed from a numerical exactly thermal model. According to the exit temperature , velocity data, and quantity of water spray, or water curtain, this dynamic simulation system can be applied to calculate the changing of temperature during the finishing milling process by off line mode; As the result agrees to the one calculated by numerical thermal model. That is the RMS error is lower than 5C. Resulting from the success of simulator development, this project can be moved forward to the development of feedforward controller for canceling the influence of skin mark. This study mentions two feedforward control schemes for skin mark problem. That is Disturbance Measurement FeedForward Controller(DM_FFC), and Dynamic Target_Temperature FeedForward Controller(DT_FFC). By using of the different processes of extracting skin mark information from temperature data, the skin mark can be completely canceled with suitable feedforward gain and the inverse of non-linear water efficiency function. Both of the above schemes for feedforward controller can be utilized to achieve the goal to cancel the skin mark by 95%. The correlation coefficient is introduced for feedward gain self-tuning. From the correlation coefficient and the variation of feedforward gain, the relationship function is obtained for feedforward gain tuning. Since those feedforward controller schemes are developed from the simulation system, based on the numerical thermal model, the influence of parameter deviations on feedforward controllers is regarding as a crucial information. At the end of this study, the evaluation for robust test is conducted. Resulting as, the feedforward controllers can still be working fine for canceling the skin mark by 90%, when there is +20% parameter deviations of thermal model.
Krishna, Kumar R. "Real Time Parallel Simulator And On-Line Parallel Controller For The Runout Table Of Hot Strip Mills." Thesis, 1995. http://etd.iisc.ernet.in/handle/2005/1643.
Повний текст джерелаTong, Kuo-Feng. "Simultaneous Plant/Controller Optimization of Traction Control for Electric Vehicle." Thesis, 2007. http://hdl.handle.net/10012/3194.
Повний текст джерела