Rozprawy doktorskie na temat „Process Control and Simulation”
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Sneesby, Martin G. "Simulation and control of reactive distillation". Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/2555.
Pełny tekst źródłaAlici, Semra. "Dynamic data reconciliation using process simulation software and model identification tools". Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3025133.
Pełny tekst źródłaSpirito, Mario. "Simulation, control and optimization of asphalt drying process". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Znajdź pełny tekst źródłaZhao, Jian 1963. "Simulation of boiler drum process dynamics and control". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61104.
Pełny tekst źródłaThe control system contains two loops, a feedfoward loop using the steam flow and drum pressure signals as the input and a feedback loop using the deviation of the measured drum water level from its set point as an input. The feedback loop is an incremental PID controller with an adjustable proportional gain. The feedfoward loop is designed to directly actuate the control devices before the "swell" and "shrinkage" in the boiler water level occur. The feedforward controller output signal is summed along with the output of the PID controller to establish the set point for the control actuator. This scheme is effective because steam flow changes are immediately fed forward to change the final feedwater set point for the control actuator. In this way, feedwater flow tracks steam flow and any disturbances in the feedwater system will be arrested quickly.
It is shown that an incremental PID controller plus adapt feedfoward compensator can be successfully employed for the control of water level in such a plant.
Cameron, Ewan A. "Enhancement of process control using real-time simulation". Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/10860.
Pełny tekst źródłaSneesby, Martin G. "Simulation and control of reactive distillation". Curtin University of Technology, School of Chemical Engineering, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10629.
Pełny tekst źródłaselect the correct process for a given application. The optimal design must also consider economics and the relative values of products, reactants and energy. These issues were studied with respect to ETBE production for gasoline oxygenation.The complexity of hybrid reactive distillation not only presents design challenges but potentially makes the process more difficult to control. Dynamic simulations of ETBE and MTBE reactive distillation processes were used to explore some unusual dynamic phenomena and to elucidate the process non-linearity and bidirectionality of reactive distillation. The presence of multiple steady states for some reactive distillation columns has been documented previously but the analysis of this behaviour has been incomplete and somewhat flawed. It was shown that the distinction between molar inputs and physically realisable mass or volumetric inputs is crucial and that multiplicity could be present in one case and not in the other. Multiplicity that is only observed with molar inputs (relatively common) was termed pseudo-multiplicity. Pseudo-multiplicity has few implications for the operation and control of practical reactive distillation processes although most literature examples of multiple steady states fall into this category. Four distinct causes of output multiplicity were identified including one new cause, reaction hysteresis, which is only applicable to hybrid reactive distillation. It was shown, using dynamic simulations, that transitions between parallel steady states are possible for a range of physically realisable and practical disturbances. This contrasts with other work in the area, which examines only unrealisable events and control schemes.An extensive analysis of reactive distillation control was also undertaken with respect to ETBE and MTBE hybrid columns. Manual (open-loop) control was shown to be impractical due to ++
the need to sustain the operating conditions at close to the optimal values in order to produce acceptable process performance. One-point composition control was found to be relatively easy to implement and effective with either an energy-balance or a material-balance control scheme provided only one steady state was present. Where multiple steady states exist, there are restrictions on the feasible control structures due to unavoidable instability in the inventory controllers. For example, if multiple steady states exist for the one value of the reboiler duty, only the bottoms product draw rate can be used to control the reboiler sump level. Thus, a material-balance control structure that uses the reboiler duty to control the sump level cannot be implemented in practice. Two-point control was also investigated and found to effectively prevent transitions between parallel steady states. Although more complex and difficult to implement than one-point control, a two-point scheme could be used successfully to control both the product composition and the reactant conversion and this could be desirable in some cases.A reactive distillation pilot plant was designed and operated for ETBE synthesis from ethanol and a locally available refinery hydrocarbon stream. The design of the pilot plant was based on simulation studies and the objective of operating in the industrially significant ranges of product purity and isobutene conversion. A fully automatic control system was designed and installed on the pilot plant to permit precise control of the manipulated variables and the framework to implement a range of control structures and schemes.Keywords: reactive distillation; process simulation; process design; process control; dynamic simulation; multiplicity; bidirectionality; distillation control; inferential control; pilot plant design and operation.
Liu, Pi-Shien 1960. "Real-time process control and simulation for chemical mix facility". Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276673.
Pełny tekst źródłaGodfrey, Simon. "Honeywell Experion System: Configuration, simulation and process control software interoperability". Thesis, Godfrey, Simon (2016) Honeywell Experion System: Configuration, simulation and process control software interoperability. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/35817/.
Pełny tekst źródłaVon, Raubenheimer Albert Ludwich. "Strategic supply chain management using simulation". Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-12012005-092956/.
Pełny tekst źródłaCox, Steven. "Simulation and control of univariate and multivariate set-up dominant process". Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11383/.
Pełny tekst źródłaGrossi, Matteo. "Dynamic design, optimization and simulation of a control strategy for a pharmaceutical bioprocess". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17906/.
Pełny tekst źródłaEkman, Mats. "Urban water management : Modelling, simulation and control of the activated sludge process". Licentiate thesis, Uppsala universitet, Avdelningen för systemteknik, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-86143.
Pełny tekst źródłaGil, Iván-Dario. "Modeling, Simulation, Dynamic Optimization and Control of a Semibatch Emulsion Polymerization Process". Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0036/document.
Pełny tekst źródłaIn this work, modeling, simulation, dynamic optimization and nonlinear control of an industrial emulsion polymerization process to produce poly-vinyl acetate (PVAc) are proposed. The reaction is modeled as a two-phase system composed of an aqueous phase and a particle phase. A detailed model is used to calculate the weight average molecular weight, the number average molecular weight and the dispersity. The moments of the growing and dead chains are used to represent the state of the polymer and to calculate the molecular weight distribution (MWD). The case study corresponds to an industrial reactor operated at a chemical company in Bogotá. An industrial scale reactor (11 m3 of capacity) is simulated where a semi-batch emulsion polymerization reaction of vinyl acetate is performed. Dynamic optimization problem is solved directly using a Nonlinear Programming solver. Integration of differential equations is made using Runge-Kutta method. Three different optimization problems are solved from the more simplistic (only one control variable: reactor temperature) to the more complex (three control variables : reactor temperature, initiator flow rate and monomer flow rate) in order to minimize the reaction time. A reduction of 25% of the batch time is achieved with respect to the normal operating conditions applied at the company. The results show that is possible to minimize the reaction time while some polymer desired qualities (conversion, molecular weight and solids content) satisfy the defined constraints. A nonlinear geometric control technique by using input/output linearization is adapted to the reactor temperature control. An extended Kalman filter (EKF) is implemented to estimate unmeasured states and it is tested in different cases including a robustness study where model errors are introduced to verify its good performance. After verification of controller performance, some process changes were proposed in order to improve process productivity and polymer quality. Finally, the optimal temperature profile and optimal feed policies of the monomer and initiator, obtained in a dynamic optimization step, are used to provide the optimal set points for the nonlinear control. The results show that the nonlinear controller designed here is appropriate to follow the optimal temperature trajectories calculated previously
Goodall, William Richard. "Scheduling and control in the batch process industry using hybrid knowledge based simulation". Thesis, University of Warwick, 1993. http://wrap.warwick.ac.uk/78612/.
Pełny tekst źródłaMohd, Noraini. "Plantwide Control and Simulation of Sulfur-Iodine Thermochemical Cycle Process for Hydrogen Production". Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/70524.
Pełny tekst źródłaNguyen, Khanh. "Evaluation of respirometry-based control strategies for the activated sludge process by computer simulation". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ46599.pdf.
Pełny tekst źródłaWoldai, Abraha. "Modelling, simulation and adaptive control of a multi-stage flash (MSF) seawater desalination process". Thesis, University of Bath, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242796.
Pełny tekst źródłaMacDonald, Angus Joseph. "Integrating CAM and process simulation to enhance the analysis and control of IC fabrication". Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/12495.
Pełny tekst źródłaIlles-Smith, Peter C. "A study of the modelling, dynamic simulation and control of the modern fluid catalytic cracking process". Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330143.
Pełny tekst źródłaLiu, Qingyun. "Statistical Process Control for the Fairness of Network Resource Distribution". FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/518.
Pełny tekst źródłaVidal, Santos Saulo Fernando dos 1987. "Simulação dinâmica para avaliação de controle de um sistema de resfriamento de líquido". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266688.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: Na maioria das indústrias químicas se faz necessário a refrigeração de equipamentos, produtos, processos, ambientes, etc. A grande desvantagem dos sistemas de refrigeração empregados nesses processos está no gasto energético envolvido, que pode representar 70% do gasto total de uma planta. Visando minimizar esses gastos, exaustivos trabalhos de pesquisa vem sendo desenvolvidos neste campo. No Laboratório de Controle e Automação de Processos da Faculdade de Engenharia Química da Unicamp, há um protótipo de um chiller utilizado em pesquisas de técnicas de modelagem e controle visando reduzir o gasto energético empregado nos sistemas de refrigeração. Com o intuito de facilitar estes estudos, este trabalho desenvolveu um modelo a partir dos simuladores comerciais ASPEN PLUS'MARCA REGISTRADA' e ASPEN DYNAMICS'MARCA REGISTRADA' capaz de representar o protótipo experimental citado. Para validação do modelo, foram utilizados dados obtidos da própria planta experimental, em diferentes condições de processo, garantindo a funcionalidade do modelo para situações diversas de funcionamento do equipamento. Uma vez validado, o modelo desenvolvido foi utilizado no estudo dinâmico do processo de refrigeração. Também foram verificadas estratégias de controle clássico e sua aplicabilidade nos sistema em questão. Está presente no trabalho o detalhamento das variáveis e parâmetros que foram utilizados na configuração, no ASPEN PLUS'MARCA REGISTRADA', dos blocos representativos dos equipamentos. Todas as formas de controle PID sugeridas se adaptaram bem ao processo, mas apenas no ponto de operação para qual o controle foi sintonizado, ou seja, para cada ponto de operação, uma nova sintonia deve ser realizada
Abstract: Refrigeration systems are required in most chemical industries in order to maintain the temperature in process equipments, production line, air-conditioned environments or rooms, etc. The main drawback of the refrigeration systems is the great expense of energy, which can represent up to 70% of the energy expenditure of the global plant. Aiming to minimize these costs, several scientific works have been developed in this field. In the Automation and Process Control Laboratory at FEQ/UNICAMP, there is a chiller prototype used in technical research on modeling and control strategies to save energy in refrigeration systems. In order to facilitate these studies, in this work it was developed a model, based on commercial simulators such as ASPEN PLUS 'TRADE MARK' and ASPEN DYNAMICS'TRADE MARK', capable of representing the experimental prototype. To validate the model, data obtained from the experimental plant, under different process conditions was used, ensuring the functionality of the model for different operating conditions. After validated, the model was used to the dynamic cooling process study. Classical control strategies were applied and their applicability in the cooling system was analyzed. This work contains details on the configuration of variables and parameters used in the equipment simulation blocks from ASPEN PLUS'TRADE MARK'. All proposed strategies of PID control showed to be well adapted to the process, but only at the operating point for which control was tuned. To summarize, for each operating point a new controller tuning must be carried out
Mestrado
Sistemas de Processos Quimicos e Informatica
Mestre em Engenharia Química
Reddy, Shailendra N. "A mathematical simulation of ETS' limestone emission control (LEC) process using a moving bed configuration". Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183736591.
Pełny tekst źródłaLamp, Shane B. "Equipment specification, process control, and plant simulation for a lignin-fueled fluidized bed combustor plant". Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=224.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains xv, 98 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 84).
Scullin, Michelle E. "Integrating Value Stream Mapping and Simulation". Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd898.pdf.
Pełny tekst źródłaGonzaga, João Carlos Bastos. "Desenvolvimento de procedimento e Soft-Sensors para controle de plantas de PET". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266832.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: Neste trabalho são apresentados três estudos distintos de aplicação de Plantwide Control. A primeira aplicação trata-se de um controle antecipativo (feedforward) para controlar os níveis dos reatores na etapa de polimerização, a fim de reduzir suas variabilidades e, consequentemente, a produção de refugo, sendo que, em uma planta de Politereftalato de Etileno (PET), a variação de nível dos polimerizadores interfere na viscosidade e está diretamente relacionada com a capacidade e com a qualidade de produção. A segunda aplicação mostra como desenvolver e utilizar um modelo computacional da planta de PET para possibilitar que alterações de parâmetros de processo, como temperatura e pressão, possam ser feitas sem que haja a necessidade de testes na planta real, uma vez que a existência de um modelo computacional que tenha o mesmo comportamento qualitativo da planta real permite que o efeito de perturbações e outros tipos de alterações na condição do processo sejam avaliados. A terceira aplicação trata-se da implantação de um sensor virtual (soft-sensor), utilizando redes neurais artificiais (RNA) para atuar como um medidor redundante da viscosidade, podendo substituir o sensor físico no caso deste vir a falhar. Estes estudos têm em comum a apresentação de procedimentos para controle do processo de produção de PET, que por possuir muitas particularidades, torna-se um assunto complexo, sendo um desafio modelar e controlar cada única unidade de produção
Abstract: In this work are presented three separate studies of application of Plantwide Control. The first application is a feedforward control to control the levels of reactors in polymerization step, in order to reduce their variability and, consequently, the production of waste, because, in a plant of PET, the variance of level of polymerizing interferes in viscosity and is directly related to the capacity and quality of production. The second application shows how to develop and use a computational model of a PET plant to enable changes to process parameters such as temperature and pressure, without the need of tests in actual plant, once the existence of a computational model has the same qualitative behavior of actual plant, and it allows the effect of disturbance and other types of changes in the condition of the process to be evaluated. The third application is the implantation of a virtual sensor (soft-sensor), using RNA, to act as a redundant viscosity meter that, in the case of possible failures, has as main function to detect physical sensor failures and replace it in the control system monitoring. Generally, the three studies have in common the presentation of procedures to control the production process of polyester. Process control for the production of polymers presents many particularities and, therefore, becomes a complex matter, being a challenge to model and to control every single production unit
Doutorado
Desenvolvimento de Processos Químicos
Doutor em Engenharia Química
Sobe, Udo, Karl-Heinz Rooch i Dietmar Mörtl. "Simulation and Analysis of Analog Circuit and PCM (Process Control Monitor) Test Structures in Circuit Design". Universitätsbibliothek Chemnitz, 2007. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200700919.
Pełny tekst źródłaSalvador, Francisco. "Projeto de um sistema de refreigeração industrial com \"Set-Point\" variável". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-05102010-112239/.
Pełny tekst źródłaThermal systems operate most of the time at off-design conditions. In industrial refrigeration systems, the operation in partial loads occurs for many different reasons and the power consumption is a function of the refrigeration cycle pressures. This work proposes an energetic optimization of the compression refrigeration systems by the operation with a variable refrigeration cycle, specifically, by the operation with a variable suction temperature set-point. For this purpose it is developed a mathematical model for dynamic simulation of a industrial refrigeration compression system for food freezing with ammonia refrigerant (R717) formed by an air blast belt freezer, liquid overfeed evaporators, low pressure receiver, screw compressors and evaporative condenser. Two procedures for the suction temperature set-point variation are analyzed by simulation: the maximum suction temperature permitted and the compressor power consumption minimization. Both methods are compared with the capacity control system used in present industrial facilities.
Appell, Kenneth William. "A mathematical simulation of ETS' limestone emission control process using the method of characteristics fixed-bed configuration/gas-phase mass transport control". Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182276120.
Pełny tekst źródłaFåhraeus, Karin. "Enhancement of the Mechatronic Development Process with Software in the loop Simulation : An embedded control case study". Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180947.
Pełny tekst źródłaDetta examensarbete är utfört på företaget Mycronic på deras mekatronikavdelning, vilka är ansvarig för utvecklingen av den inbyggda mjukvaran i deras ytmonteringsmaskiner. I dagsläget kan den inbyggda koden köras och testas i en PIL simulering, där kontrollkoden körs på det inbyggda systemet medan dynamiken av systemet är modellerad och uttryckt med matematiska ekvationer implementerat i en C-funktion. Uppgiften är att hitta ett sätt att köra en simulering med den riktiga inbyggda koden på en dator. Syftet med examensarbetet är att utreda och undersöka hur denna simulering kan förbättra utvecklingsprocessen för den inbyggda koden hos Mycronic. För inbyggda system och reglerteknik syftar Model-based Development (modellbaserad utveckling) oftast på att modeller och simulering av styrsystemet och det dynamiska systemet. Ett modellbaserat arbetsflöde startar med Model in the loop (MIL), sedan Software in the loop (SIL), Processor in the loop (PIL) och sist Hardware in the loop (HIL). Software in the loop simulering betyder att det dynamiska systemet är modellerat men styrsystemet är implementerat i en lågnivå programmeringsspråk så som C. Resultatet från undersökning som innefattade att hitta ett sätta att implementera en simulering var en SIL simulering som representerar en av axlarna och körs på två olika sätt. Simuleringen kör styrsystemets kod tillsammans med en modellering av det dynamiska systemet där skillnaden är implementeringen av denna modell. För den första metoden implementeras dynamiken på samma sätta som PIL simuleringen och för den andra metoden implementeras dynamiken i en modell i Simulink. Resultatet från detta examensarbete är att SIL simuleringen har visat sig vara väldigt användbar och har många fördelar. SIL simuleringen ger en möjlighet att köra och testa koden och regleringen innan den köra på det inbyggda systemets processor. Problem och fel kan på sätt upptäckas tidigt. En stor fördel är att SIL simuleringen inte är beroende av någon hårdvara eller annan mjukvara. Det blir enklare att felsöka koden med SIL simuleringen och längre loggningar kan göras då minnet inte är så begränsat som på det inbyggda systemet. En väldigt viktig fördel med SIL simuleringen är att den inkluderar interaktionen mellan den mekaniska, regler och mjukvaru designen. Den bidrar även till att kunna köra huvudmjukvaran ihop med det inbyggda systemets simulering, vilket hjälper till i integrationsprocessen.
Robles, Martínez Ángel. "Modelling, simulation and control of the filtration process in a submerged anaerobic membrane bioreactor treating urban wastewater". Doctoral thesis, Editorial Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34102.
Pełny tekst źródłaRobles Martínez, Á. (2013). Modelling, simulation and control of the filtration process in a submerged anaerobic membrane bioreactor treating urban wastewater [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34102
Alfresco
Premiado
Capaci, Francesca. "Contributions to the Use of Statistical Methods for Improving Continuous Production". Licentiate thesis, Luleå tekniska universitet, Industriell Ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66256.
Pełny tekst źródłaBhagavatula, Narayan L. "Modeling and experimental verification of pressure prediction in the in-mold coating process for thermoplastic substrates". Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1145371989.
Pełny tekst źródłaGerman, Alina. "Usage of aviation simulator in a process of ATS officers training". Thesis, Національний авіаційний університет, 2020. http://er.nau.edu.ua/handle/NAU/42352.
Pełny tekst źródłaAviation is a sphere where voice communication system plays a great role. Proficiency in English is a key tool for an air traffic controller and phraseology of radio exchange has a number of specific features. Air traffic controller’s work includes maintaining an orderly flow of air traffic, servicing of an aircraft and control of safe movement on the ground and in the airspace. The only way to communicate with the pilot is a radio communication, which takes place in a real-time operation and requires maximum attention from the specialist. Among the below overviewed means and methods of training, a special place is taken by simulator training, which has the closest connection with the formation of ATCO's high competence and confidence. For this purpose, the existing training systems and theoretical approach foe studying was analyzed. Training simulators allow the formation of knowledge, skills and abilities, as well as professionally important qualities. The main purpose of this work is to present the device that can be used for aviation personal training, as well as in different directions. The aim of this graduate thesis is an investigation of existing training system for an ATCO, its components and training simulators to be used for a specialist preparation and creation of new simulator for aviation personnel training. The following tasks have to get accomplished: 1) Analyze general process of aviation personnel simulator training; 2) Analyze the process of professional skills formation; 3) Analyze human factor affects and its reduction due to skills training; 4) Overview of new simulator system and its usage.
Dureau, Maxime. "Characterization and simulation of the mechanical forces that control the process of Dorsal Closure during Drosophila melanogaster embryogenesis". Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL0999/document.
Pełny tekst źródłaThe work presented here aims at characterizing and simulating the mechanical forces involved in the process of Dorsal Closure in the organism Drosophila melanogaster, an embryonic process. In particular, Dorsal Closure participates in the acquisition of the final form of the embryo. Therefore, the work presented here aims at fathoming our knowledge on tissues mechanics, as well as their role in the acquisition of shape. The tissues involved in Dorsal Closure are the epidermis and the amnioserosa. At this stage of development, the epidermis surrounds almost all the embryo. Nevertheless, the amnioserosa still covers a large area of the dorsal side called dorsal hole. Hence, Dorsal Closure aims at shutting this hole and joining the lateral sides of the epidermis, in a process similar to wound healing. In order to fuse the two sides of the epidermis on the dorsal line, the epidermis must be drawn dorsalward. This movement is driven by the amnioserosa on the one hand, and by the dorsalmost row of the epidermis (called Leading Edge cells) on the other hand. The latter first form a transcellular Actin Cable around the dorsal hole. The cable, contracting, will reduce the area of the dorsal hole, covered by the amnioserosa. Second, the Leading Edge cells emit protrusions that will attach to the opposite Leading Edge and drag it toward themselves, untill the two sides of the epidermis fuse. These protrusions have a limited range, hence the dragging and fusion only take place at the ends of the dorsal hole (called canthi), where the distance between the two Leading Edges is small enough. The Amnioserosa also drags the epidermis toward the dorsal line. Its cells produce a contractile network. Interstingly, Amnioserosa cells see the area of their top side (apical side) vary in a periodic way. Although these variations have been widely studied, their role in Dorsal Closure remains unknown. This PhD aims at improving our knowledge of the mechanical concepts involved in these oscillations, and to build a physical model representing these movements. The work presented here also studies the movements of the Leading Edge cells, in order to understand the effect of the Actin Cableon the dynamics of Dorsal Closure. In order to study the cells movements and the role of the tissues involved in Dorsal Closure, an algorithm was developped, allowing to detect the cells edges, their position, as well as those of their vertices (multiple junction between three or four cells) and to track them over time. A user interface was also developped, in order to facilitate the adjustment of the parameters allowing the detection, as well as the correction of possible errors. Various dynamical models were then built following the lagrangian approach. The systems of equations deriving from the Euler-Lagrange equations were numerically solved, and their predictions compared to the biological data extracted thanks to the algorithm presented earlier, following the least square approach. The model validation was performed thanks to the autocorrelation function test. Finally, the Leading Edge dynamics was studied characterising the cellular movements at the interface between the epidermis and the amnioserosa. Wild type embryos dynamics were compared to those of mutated embryos showing specific defects in the Actin Cable formation. The results presented in this manuscript allow a better understanding of the processes involved in in Amnioserosa cells oscicllations. They also give clues on their biological characteristics. Finally, they assess the role of the actin cable in this process similar to wound healing
Mousavi, Takami Kourosh. "Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications : Electric power systems". Doctoral thesis, Västerås : School of Sustainable Development of Sociaty and Technology, Mälardalen University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6648.
Pełny tekst źródłaYang, Xiaochuan. "Simulation of atomization process coupled with forced perturbation with a view to modelling and controlling thermoacoustic instability". Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/simulation-of-atomization-process-coupled-with-forced-perturbation-with-a-view-to-modelling-and-controlling-thermoacoustic-instability(be01a5bf-41ab-43ea-b96d-9240eded7cb7).html.
Pełny tekst źródłaTashtoush, Tariq Husni. "Using lean principles and simulation to enhance the effectiveness of a failure analysis laboratory in a manufacturing environment". Diss., Online access via UMI:, 2009.
Znajdź pełny tekst źródłaIncludes bibliographical references.
Chen, Shuai. "Investigation of FEM numerical simulation for the process of metal additive manufacturing in macro scale". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI048/document.
Pełny tekst źródłaAdditive manufacturing (AM) has become a new option for the fabrication of metallic parts in industry. However, there are still some limitations for this application, especially the unfavourable final shape and undesired macroscopic properties of metallic parts built in AM systems. The distortion or crack due to the residual stress of these parts leads usually to severe problems for some kinds of metal AM technology. In an AM system, the final quality of a metallic part depends on many process parameters, which are normally optimized by a series of experiments on AM machines. In order to reduce the considerable time consumption and financial expense of AM experiments, the numerical simulation dedicated to AM process is a prospective alternative for metallic part fabricated by additive manufacturing. Because of the multi-scale character in AM process and the complex geometrical structures of parts, most of the academic researches in AM simulation concentrated on the microscopic melting pool. Consequently, the macroscopic simulation for the AM process of a metallic part becomes a current focus in this domain. In this thesis, we first study the pre-processing of AM simulation on Finite Element Method (FEM). The process of additive manufacturing is a multi-physics problem of coupled fields (thermal, mechanical, and metallurgical fields). The macroscopic simulation is conducted in two different levels with some special pre-processing work. For the layer level, the reconstruction of 3D model is conducted from the scan path file of AM machine, based on the inverse manipulation of offsetting-clipping algorithm. For the part level, the 3D model from CAD is reconstructed into a voxel-based mesh, which is convenient for a part with complex geometry. The residual stress of a part is analysed under different preheat temperatures and different process parameters. These simulations imply the potential technique of reducing residual stress by the optimisation of process parameters, instead of the traditional way by increasing preheat temperature. Based on the FEM simulation platform above, two simulations at line level are also studied in this thesis, aiming at the relation between the AM process and part's final quality. These examples demonstrate the feasibility of using macroscopic simulations to improve the quality control during the AM process. In the first task, dataset of heating parameters and residual stress are generated by AM simulation. The correlation between them is studied by using some regression algorithm, such as artificial neural network. In the second task, a PID controller for power-temperature feedback loop is integrated into AM process simulation and the PID auto-tuning is numerically investigated instead of using AM machine. Both of the two tasks show the important role of AM macroscopic process simulation, which may replace or combine with the numerous trial and error of experiments in metal additive manufacturing
Joubaud, Maud. "Processus de Markov déterministes par morceaux branchants et problème d’arrêt optimal, application à la division cellulaire". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS031/document.
Pełny tekst źródłaPiecewise deterministic Markov processes (PDMP) form a large class of stochastic processes characterized by a deterministic evolution between random jumps. They fall into the class of hybrid processes with a discrete mode and an Euclidean component (called the state variable). Between the jumps, the continuous component evolves deterministically, then a jump occurs and a Markov kernel selects the new value of the discrete and continuous components. In this thesis, we extend the construction of PDMPs to state variables taking values in some measure spaces with infinite dimension. The aim is to model cells populations keeping track of the information about each cell. We study our measured-valued PDMP and we show their Markov property. With thoses processes, we study a optimal stopping problem. The goal of an optimal stopping problem is to find the best admissible stopping time in order to optimize some function of our process. We show that the value fonction can be recursively constructed using dynamic programming equations. We construct some $epsilon$-optimal stopping times for our optimal stopping problem. Then, we study a simple finite-dimension real-valued PDMP, the TCP process. We use Euler scheme to approximate it, and we estimate some types of errors. We illustrate the results with numerical simulations
Wang, Hao. "Characterization and Control of Molecular Contaminants on Oxide Nanoparticles and in Ultra High Purity Gas Delivery Systems for Semiconductor Manufacturing". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/293417.
Pełny tekst źródłaLin, Wen-Hsing. "A comprehensive computer program for the control of first-order process with time delay". Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178132732.
Pełny tekst źródłaLeksawasdi, Noppol Biotechnology & Biomolecular Sciences (BABS) UNSW. "Kinetics and modelling of enzymatic process for R-phenylacetylcarbinol (PAC) production". Awarded by:University of New South Wales. Biotechnology and Biomolecular Sciences (BABS), 2004. http://handle.unsw.edu.au/1959.4/20846.
Pełny tekst źródłaPropes, Nicholas Chung. "Hybrid Systems Diagnosis and Control Reconfiguration for Manufacturing Systems". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5150.
Pełny tekst źródłaPaul, Parneet. "Using traditional modelling approaches for a MBR system to investigate alternate approaches based on system identification procedures for improved design and control of a wastewater treatment process". Thesis, De Montfort University, 2011. http://hdl.handle.net/2086/5387.
Pełny tekst źródłaSilva, Bruno Firmino da 1989. "Desenvolvimento e avaliação de sistemas de controle plantwide aplicados na produção de biodiesel". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266023.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: Os processos químicos apresentam dinâmicas complexas devido a presença de reciclos, integrações energéticas e diversas operações unitárias interconectadas, gerando problemas de interação entre as variáveis e dificultando um efetivo controle do processo. Metodologias de controle global ou plantwide buscam estabelecer sistemas de controle contemplando a planta química como um todo, porém, geram mais de uma solução de controle. Este trabalho propõe avaliar diferentes estruturas de controle global para uma mesma planta química através do uso de indicadores chave de desempenho (KPI ¿ Key Performance Indicator) para o processo, determinando assim qual sistema de controle melhor atende aos objetivos estratégicos da indústria. Como caso de estudo simulou-se uma planta típica para a produção de biodiesel através dos softwares Aspen Plus e Aspen Plus Dynamics. O processo implementado busca representar a produção do biocombustível obtido na transesterificação do óleo de soja com metanol, por meio da rota de catálise alcalina e homogênea. Para simulação dinâmica do processo, utilizaram-se dois conjuntos de controladores obtidos da metodologia de controle global heurística, configurando-se duas propostas de controle para o processo. Para avaliação das propostas de controle, utilizaram-se indicadores chave de desempenho representativos do processo global. O indicador DDS (Dynamic Disturbance Sensitivity), o qual relaciona o acúmulo molar total dos componentes ao longo do tempo, e um indicador que relaciona os custos de matérias-primas foram utilizados. Ambos indicadores, permitiram uma visualização do desempenho dos controladores de modo global e a auxiliaram na escolha do melhor conjunto de malhas de controle para o processo
Abstract: Chemical process have complex dynamics behaviors due to the presence of recycle streams, heat integration and several unit operations interconnected, leading to interaction problems among variables and making difficult to do an effective process control. Plantwide control methodologies aim to establish controls systems for entire chemical plants; however, it is possible to obtain different control solutions. This work proposes an evaluation of different Plantwide control structures for a specific process using Key Performance Indicators (KPI) and determinate which structure best meets the industry strategic goals. As a case study, it was implemented a simulation of a typical biodiesel process in Aspen Plus and Aspen Plus Dynamics. The process implemented intended to represent the production of biofuel obtained from the transesterification of soybean oil with methanol and homogeneous alkaline catalysis as chemical route. For dynamic simulation of the process, two sets of controllers obtained using global control heuristic methodology were used to control the process, setting up two proposals of control for biodiesel production. Key performance indicators of the overall process were used to evaluate the control proposals, such as the DDS indicator (Dynamic Disturbance Sensitivity), which presents the total molar accumulation over time, and an indicator that presents the raw material costs also over time. Both indicators allowed a view of the controllers global performance and aided in choose the best set of control loops for the process
Mestrado
Sistemas de Processos Quimicos e Informatica
Mestre em Engenharia Química
Guzman, Pamela, Franklin Montalvo, Edgardo Carvallo i Carlos Raymundo. "Implementation of a process management model and inventory control to increase the level of service in the after-sales area of industrial equipment". Latin American and Caribbean Consortium of Engineering Institutions, 2019. http://hdl.handle.net/10757/656260.
Pełny tekst źródłaPires, Carlos Augusto de Moraes. "Reforma catalitica da nafta : modelagem, simulação e controle do processo". [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267566.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: O processo de refonna catalítica da nafta, voltado para a produção de compostos aromáticos (benzeno, tolueno e xilenos), foi o tema abordado neste estudo. Considerou-se um típico processo semi-regenerativo, no qual existem quatro reatores radiais em série intercalados com quatro fornalhas que são utilizadas para aquecer as correntes que alimentam os reatores. A modelagem dos reatores foi proposta para os regimes estacionário e transiente e foi considerado um sistema reacional simplificado, envolvendo apenas dez compostos químicos relacionados através de cinco reações. A desativação do catalisador faz parte do modelo cinético e a expressão da taxa de fonnação de coque é baseada na condensação do aromático. Este modelo foi simulado a partir de um programa de computador construí do em linguagem FORTRAN, chegando-se a resultados compatíveis com os encontrados em literatura. Desta fonna, foi possível efetuar um estudo sobre os efeitos das variáveis operacionais nas concentrações dos produtos deste processo e várias conclusões importantes foram obtidas. Após analisar as relações entre os produtos originários da refonna com as variáveis operacionais, foi proposta uma estratégia de controle em cascata para manter a concentração de aromático no "setpoint" desejado. O objetivo da aplicação desta estratégia de controle é o de compensar os efeitos da desativação do catalisador, bastando para isso aumentar a temperatura da corrente de entrada dos reatores. A malha secundária, do controle em cascata, controla a temperatura de entrada dos reatores. Foram utilizados os controladores PID, DMC e LDMC no intuito de verificar o melhor desempenho desta malha. Estes controladores foram elaborados em linguagem FORTRAN e através da simulação destes casos foram obtidas infonnações que pennitiram concluir que o controlador LDMC é o mais apropriado. Para a malha primária, que controla a concentração de aromático, impondo as temperaturas ótimas de entrada para cada reator (setpoints" da malha secundária), foi utilizado o controlador LDMC com duas opções de configuração para a matriz dinâmica. A primeira opção considera o sistema como sendo de múltiplas entradas e única saída (MISO), com as temperaturas representando as variáveis manipuladas e a concentração de aromático a controlada. A segunda opção supõe que o sistema possui única entrada e única saída (SISO), a variável manipulada é a W AIT (que é a soma ponderada das temperaturas de entrada dos reatores, levando em conta a quantidade de catalisador em cada um dos leitos) e a variável controlada é a concentração de aromático. Observa-se que não houve diferença significativa entre estas duas opções para a malha primária, notando-se apenas uma ligeira vantagem para o caso MISO em função da maior atividade do catalisador. Como conclusão deste trabalho, foi possível verificar os vários aspectos da refonna catalítica da nafta inerentes ao processo de obtenção de aromáticos. Entretanto, outras pesquisas nesta linha devem ser realizadas para conseguir, dentre outras coisas, diminuir a defasagem existente de infonnações entre a tecnologia atual e a teoria disponível, sendo que esforços como este devem ser incentivados para obtenção de mais conhecimentos sobre o processo
Abstract: The theme of this study is the process of catalytic refonning for aromatics (benzene, toluene and xilenes). There were considered a typical semiregenerative process, with serial arrange of four radial reactors preceded by four furnaces used to pre-heat the reactors feed. There were proposed stationary and transient for the reactors. A simplified reacctional system were considered, involving only ten chemical compounds related through five reactions. The kinetic model inc1ude the deactivation of the catalyst and the rate of coke fonnation is based on aromatic condensation. The model was simulated in a computer FORTRAN code and the achieved results are compatible with the literature ones. It was then possible to study the effects of operational variables in the products concentrations and several important conclusions were obtained. The relationship among the reforming process products with operational variables were analyzed and a cascade control strategy was proposed to maintain the aromatic concentration in the desired set point. The objective of this control strategy is to compensate the catalyst deactivation effects, and its only action is to increase the temperature of the feed reactors. The secondary loop in the cascade control strategy controls the temperature of the feed ofthe reactors. Controllers PID, DMC and LDMC were tested in order to verify which is the one what maximizes the loop performance. The controllers were programmed in a FORTRAN code and the simulation results shows that the controller LDMC is the most appropriate. For the primary loop, which controls the aromatic concentration, imposing the optimal temperature in each reactor feed ( set point of secondary loop) the controller LDMC was used with two possible configuration of the dynamic matrix. The first option considers the system with multiple entrances and only a exit (MISO), with the temperatures representing the manipulated variables and the aromatic concentration as the controlled one. The second option supposes that the system has only one entrance and only one exit (SISO). The manipulated variable is WAIT (weighted average inlet temperature) the controlled variable is also the aromatic concentration. Both options for primary loop are equivalent, the MISO options is slightly better than the often one because of largest catalyst activity. In this work, it was verified several aspects inherent of catalytic naphtha refonning process for the production of aromatics. Other researches in this line should he done in order to reduce the existent gap of information between current technology and available theory, and other efforts should be motivated for obtaining a better knowledge of the processo
Doutorado
Sistemas de Processos Quimicos e Informatica
Doutor em Engenharia Química
Wenzel, Anne. "Erstellung eines Modells zum Abruf positiver Minutenreserve". Bachelor's thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-66418.
Pełny tekst źródłaPimenta, Luciana Bispo. "Simulação dinâmica de planta de condicionamento de gás natural em plataforma offshore". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266786.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: O comportamento dinâmico em unidades de produção de óleo é muito importante para a operação e projeto de equipamentos. O desenvolvimento da tecnologia no processamento primário de petróleo é caracterizado pela otimização de peso e espaço nas unidades de produção. Estas restrições têm sido diretrizes para pesquisas em desenvolvimento de equipamentos mais eficientes e compactos, como hidrociclones. Porém, esta capacidade de compactar equipamentos resultou em redução na flexibilidade em operar com oscilações de carga (golfadas). Ao longo dos últimos anos, a maturação de campos produtores e o aumento na produção de água e no uso de gás lift associados à produção de óleo em lâminas d'água cada vez mais profundas têm aumentado a freqüência de golfadas. A simulação dinâmica pode ser utilizada para desenvolver estratégias para controlar situações transientes em plataformas offshore. Este trabalho utilizou a simulação dinâmica de uma planta de condicionamento de gás natural em plataforma offshore feita no simulador de processos HYSYS 7.2, como ferramenta para analisar a planta e propor melhores condições de operação. Neste trabalho duas situações serão analisadas. Na primeira, apenas o gás associado passa pelo sistema de compressão e o gás não associado é encaminhado diretamente para desidratação com TEG (situação 1). Na segunda, haverá uma quebra de pressão do gás proveniente dos poços de gás e este deverá ser encaminhado para o sistema de compressão juntamente com o gás proveniente dos poços de óleo (situação 2). Em um primeiro momento, a planta foi analisada em modelo de estado estacionário e foi avaliado o efeito da quebra de pressão na temperatura da tubulação à jusante das válvulas responsáveis pela quebra (situação 2). Em um segundo momento, a planta foi avaliada no estado dinâmico, onde foi possível analisar o efeito que as oscilações de carga têm no sistema de compressão da planta, bem como nas trocas térmicas. Este segundo estudo foi avaliado para as situações 1 e 2. Para o estudo em estado estacionário, foi possível observar que a especificação de temperatura mínima de projeto para a tubulação à jusante das válvulas que efetuam a quebra de pressão não é alcançada, porém, existe uma faixa de ?P ideal para cada válvula a fim de evitar a formação de gelo na parte externa da tubulação. Para o estudo dinâmico foi possível avaliar os efeitos que as oscilações de carga trazem para o sistema de compressão e em que situação (1 ou 2) a planta opera com maior estabilidade. Verificou-se que o trocador da saída do sistema de compressão opera com certa instabilidade na situação 1 devido à baixa vazão de gás a ser resfriado e na situação 2 esta instabilidade é reduzida. As conclusões deste estudo mostram a importância da simulação dinâmica como ferramenta de decisão para o engenheiro de processamento de gás na operação da planta
Abstract: Dynamic behavior in oil production units is vital for equipments project and operation. Technology development in offshore primary processing has traditionally been characterized by optimizing weight and space in their production units. Such restrictions have been the guidelines for researches in developing more efficient and compact equipments, such as hydro cyclones. However, this compactness has resulted, invariably, in reduced capacity to deal with load oscillations, typical in offshore units. Along the last years the maturation of production fields, and the increase of water production and gas lift use, associated to the oil production in larger and larger water depths have been increasing slugs intensity. Dynamic simulation can be used to develop better strategies to control transient situations in offshore units. This study use a dynamic simulation of a natural gas offshore conditioning plant as a tool to analyze the plant and to propose better operational conditions. The process simulator to do dynamic simulation was HYSYS 7.2. In this work two situations were analyzed. In the first one, only the gas from oil wells pass through the gas compression system and the gas from gas wells are forwarded directly to dehydration with TEG (situation 1). In the second situation, there will be a pressure drop of the gas from gas wells and this gas should be forwarded to the compression system along with gas from oil wells (situation 2). At first, the plant was analyzed in steady state model and the effect of pressure drop in pipe temperature downstream of the valves responsible for pressure drop was evaluated (situation 2). In a second stage the plant was evaluated in dynamic state where it was possible to analyze the effect of load oscillations in the compression system, as well as in the heat exchange. This second study was evaluated for situations 1 and 2. For the static study, the specification of minimum project temperature for the pipeline downstream of the valves that perform the pressure drop is not achieved but there is an ideal range pressure drop for each valve to prevent ice formation outside the pipe. In the dynamic study was evaluated the effects of load oscillations in compression system and in what situation (1 or 2) the plant operates with greater stability. It was found that the heat exchange of the output of the compression system operates with instability in the situation 1 due to the low flow of gas to be cooled, and in the situation 2 this instability is reduced. The conclusions of this study show the importance of dynamic simulation as a decision tool for the engineer in the gas processing plant operation
Mestrado
Desenvolvimento de Processos Químicos
Mestre em Engenharia Química
Rosa, Eduardo Ledoux. "Projeto de controle e otimização de um sistema de geração de vapor com múltiplas caldeiras com simulação dinâmica". Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/688.
Pełny tekst źródłaThis study proposes to develop a control project for a multiple boilers steam generation system that includes fuel optimization. To achieve that, it must combine an efficient boiler regulatory control and an efficient mechanism for load allocation to each boiler in order to operate with normally required reliability and combined with optimum fuel consumption. This dissertation presents: dynamic modeling of an industrial watertube boiler; computational implementation of the dynamic watertube Boiler model in Matlab, the control design of a watertube Boiler in 800xA automation system involving the definition of control strategies, communication of the 800xA automation system with the plant model in Matlab, an evaluation of some techniques for PID tuning including dynamic simulation results, the optimization problem to minimize the total fuel consumption of a multiple boilers steam generation system, as well as the assessment of their resolution with Mixed Integer Linear Programming modeling approach, and control design of a multiple boilers system, also involving dynamic simulation. Based on simulated experiments it was found that the control strategy proposed in this work has satisfactory performance, mainly because of the inclusion of the divider block load did not affect the rejection of disturbances characteristic, which encourages further studies with objective of practical use.