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Artykuły w czasopismach na temat "FPD+I CONTROLLER"
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Karam, Ekhlas H., Ayam M. Abbass i Noor S. Abdul-Jaleel. "Design of Hybrid Neural Fuzzy Controller for Human Robotic Leg System". Al-Khwarizmi Engineering Journal 14, nr 1 (8.04.2018): 145–55. http://dx.doi.org/10.22153/https://doi.org/10.22153/kej.2018.08.007.
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In this paper, the human robotic leg which can be represented mathematically by single input-single output (SISO) nonlinear differential model with one degree of freedom, is analyzed and then a simple hybrid neural fuzzy controller is designed to improve the performance of this human robotic leg model. This controller consists from SISO fuzzy proportional derivative (FPD) controller with nine rules summing with single node neural integral derivative (NID) controller with nonlinear function. The Matlab simulation results for nonlinear robotic leg model with the suggested controller showed that the efficiency of this controller when compared with the results of the leg model that is controlled by PI+2D, PD+NID, and FPD-ID controllers.
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Karam, Ekhlas H., Ayam M. Abbass i Noor S. Abdul-Jaleel. "Design of Hybrid Neural Fuzzy Controller for Human Robotic Leg System". Al-Khwarizmi Engineering Journal 14, nr 1 (8.04.2018): 145–55. http://dx.doi.org/10.22153/kej.2018.08.007.
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In this paper, the human robotic leg which can be represented mathematically by single input-single output (SISO) nonlinear differential model with one degree of freedom, is analyzed and then a simple hybrid neural fuzzy controller is designed to improve the performance of this human robotic leg model. This controller consists from SISO fuzzy proportional derivative (FPD) controller with nine rules summing with single node neural integral derivative (NID) controller with nonlinear function. The Matlab simulation results for nonlinear robotic leg model with the suggested controller showed that the efficiency of this controller when compared with the results of the leg model that is controlled by PI+2D, PD+NID, and FPD-ID controllers.
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Al-Ubaidi, Safaa M. Z., i Maher M. F. Algreer. "Real Time Implementation of PID and Fuzzy PD Controllers for DC-Servo Motor Based on Lab View Environment". Tikrit Journal of Engineering Sciences 19, nr 2 (30.06.2012): 71–81. http://dx.doi.org/10.25130/tjes.19.2.08.
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This paper presents an implementation of conventional PID (CPID) controller using Ziegler-Nichols rules and fuzzy PD (FPD) controller for position servo motor control based on Lab View (Laboratory Virtual Instrument Engineering Workbench Environment) through Data Acquisition (DAQ) Device PCI- 6521 of National Instrument's and Data Acquisition Accessory Board Model (CB-68LP).CPID controller is perhaps the most well-known and most widely used in industrial applications. However, it has been known that CPID controller generally don’t work well for non-linear systems, higher order and time-delayed linear system and particularly complex and vague system. To overcome these difficulties, this paper proposes to use the FPD controller for a servo motor system instead of CPID. The parameters of servo motor used are completely unknown. The FPD structure has two-input single-output and fairly similar characteristic to its conventional counterpart and provides good performance. Simple rules base are used for FPD (nine rules only). Performance evaluation was carried out via a comparison study for the proposed control scheme and other existing control scheme, such as CPID controller. The critical point for this experiment on position system is a steady state error and settling time. The performance showing that the FPD has less settling time and zero steady state error over its CPID. The algorithms of FPD and CPID controllers are implemented using PID, Fuzzy Logic and simulation toolkits of the Lab View environment.
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Alkargole, Hazim M., Abbas S. Hassan i Raoof T. Hussein. "Analyze and Evaluate the Performance Velocity Control in DC Motor". Radioelectronics. Nanosystems. Information Technologies 12, nr 4 (1.12.2020): 507–16. http://dx.doi.org/10.17725/rensit.2020.12.507.
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A mathematical model of controlling the DC motor has been applied in this paper. There are many and different types of controllers have been used with purpose of analyzing and evaluating the performance of the of DC motor which are, Fuzzy Logic Controller (FLC), Linear Quadratic Regulator (LQR), Fuzzy Proportional Derivative (FPD) ,Proportional Integral Derivative (PID), Fuzzy Proportional Derivative with integral (FPD plus I) , and Fuzzy Proportional Integral (FPI) with membership functions of 3*3, 5*5, and 7*7 rule bases. The results show that the (FLC) controller with 5*5 rule base provides the best results among all the other controllers to design the DC motor controller.
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Sahu, Prakash Chandra, Ramesh Chandra Prusty i Sidhartha Panda. "A gray wolf optimized FPD plus (1+PI) multistage controller for AGC of multisource non-linear power system". World Journal of Engineering 16, nr 1 (11.02.2019): 1–13. http://dx.doi.org/10.1108/wje-05-2018-0154.
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Purpose The paper has proposed to implement gray wolf optimization (GWO)-based filter-type proportional derivative with (FPD) plus (1+ proportional integral) multistage controller in a three-area integrated source-type interlinked power network for achieving automatic generation control. Design/methodology/approach For analysis, a three area interconnected power system of which each area comprises three different generating units where thermal and hydro system as common. Micro sources like wind generator, diesel generator and gas unit are integrated with area1, area2 and area3 respectively. For realization of system nonlinearity some physical constraints like generation rate constraint, governor dead band and boiler dynamics are effected in the system. Findings The supremacy of multistage controller structure over simple proportional integral (PI), proportional integral, derivative (PID) and GWO technique over genetic algorithm, differential evolution techniques has been demonstrated. A comparison is made on performances of different controllers and sensitivity analysis on settling times, overshoots and undershoots of different dynamic responses of system as well as integral based error criteria subsequent a step load perturbation (SLP). Finally, sensitive analysis has been analyzed by varying size of SLP and network parameters in range ±50 per cent from its nominal value. Originality/value Design and implementation of a robust FPD plus (1 + PI) controller for AGC of nonlinear power system. The gains of the proposed controller are optimized by the application of GWO algorithm. An investigation has been done on the dynamic performances of the suggested system by conducting a comparative analysis with conventional PID controller tuned by various optimization techniques to verify its supremacy. Establishment of the robustness and sensitiveness of the controller by varying the size and position of the SLP, varying the loading of the system randomly and varying the time constants of the system.
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Maqbool, Hina, Adnan Yousaf, Rao Muhammad Asif, Ateeq Ur Rehman, Elsayed Tag Eldin, Muhammad Shafiq i Habib Hamam. "An Optimized Fuzzy Based Control Solution for Frequency Oscillation Reduction in Electric Grids". Energies 15, nr 19 (23.09.2022): 6981. http://dx.doi.org/10.3390/en15196981.
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The demand for uninterruptible electricity supply is increasing, and the power engineering sector has started researching alternative solutions. Distributed generation (DG) dissemination into the electric grid to cope with the accelerating demand for electricity is taken into consideration. However, its integration with the traditional grid is a key task as sudden changes in load and their fickle nature cause the frequency to deviate from its adjusted range and affect the grid’s reliability. Moreover, the increased use of DG will significantly impact power system frequency response, posing a new challenge to the traditional power system frequency framework. Therefore, maintaining the frequency within the nominal range can improve its reliability. This deviation should be removed within a few seconds to keep the system’s frequency stable so that supply and demand are balanced. In a traditional grid system, the controllers installed at the generation side help to control the system’s frequency. These generators have capital installation costs that are not desirable for system operators. Therefore, this article proposed a comprehensive control framework to enable high penetration of DG while still providing adequate frequency response. This is accomplished by investigating a grasshopper optimization algorithm-based (GOA) fuzzy PD-PI controller (FPD-PI) for analyzing frequency control and optimizing the FPD-PI controller gains to minimize the frequency fluctuations. In this paper, interconnected hybrid power systems (HPS) are considered. In this study, the response of a system is analyzed, and the results validate that the oscillations in frequency are substantially reduced by the proposed controller. Moreover, our model is the best option for controlling frequency instead of conventional controllers, as it is efficient and fast to regulate frequency by switching the preferred loads on or off.
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Yau, Chin Horng, Wen Ren Jong i H. H. Wang. "Design and Analysis of SCARA Substrate Transfer Robot for Semiconductor and FPD Processing Cluster Tools". Materials Science Forum 505-507 (styczeń 2006): 331–36. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.331.
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The design criteria and dynamic analysis of SCARA substrate transfer robot for cluster tools have been investigated in this paper. The design criteria for SCARA robot to meet the application of semiconductor and flat panel display processing have been verified. The dynamic equations of decomposed modules of SCARA substrate transfer robot, such as arm module, friction module, servomotor module, harmonic drive module and belt module are formulated by Lagrange’s method respectively. Then, the dynamic equations are all built and simulated with MATLAB software. In addition, the elasticity characteristics of belt and harmonic drive are further discussed in this paper. In the aspect of control, the PID controller and force control method are both used to suppress the vibration and improve the transient response.
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Brahim, Dahhou, Bendjebbar Mokhtar i Lachtar Salah. "Improvement of adaptive fuzzy control to adjust speed for a doubly fed induction motor drive (DFIM)". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, nr 1 (1.06.2020): 496. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp496-504.
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This paper presents the doubly fed induction motor (DFIM) speed control using adaptive fuzzy logic PI (AFLPI) controller to give better dynamic performances. Before the advent of modern technology, integral proportional based current controller is usually used due to its simplicity. But, the performance of closed-loop control is largely influenced by this type of speed and torque controllers used, as long as the PI controllers suffer from tuning problem. To overcome the problem, a new technique AFLPI based speed controller for direct field oriented control fed DFIM to get fast speed response and to minimize the torque ripple. The application of this type of control is very satisfactory to replace the conventional PI controller and, even the fuzzy logic PI (FLPI) controller. The performance of the field oriented controlled DFIM drive has simulated at different operating conditions using the AFLPI controller and the obtained results are compared with FLPI controller and conventional PI controller. Accordingly, an improvement in dynamic and robustness is clearly appears in AFLPI controller simulation results compared to the others aforementioned controllers. Simulation Results are presented for the three techniques using Matlab/Simulink to prove the dynamic performances and robustness.
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Aidoud, Mohammed, Moussa Sedraoui, Abderrazek Lachouri i Abdelhalim Boualleg. "A robustification of the two degree-of-freedom controller based upon multivariable generalized predictive control law and robust H∞ control for a doubly-fed induction generator". Transactions of the Institute of Measurement and Control 40, nr 3 (1.11.2016): 1005–17. http://dx.doi.org/10.1177/0142331216673425.
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A robustification method of primary two degree-of-freedom (2-DOF) controllers is proposed in this paper to control the wind turbine system equipped with a doubly-fed induction generator DFIG. The proposed robustification method should follow the following three step-procedures. First, the primary 2-DOF controller is designed through the initial form of the multivariable generalized predictive control MGPC law to ensure a good tracking dynamic of reference trajectories. Second, the robust [Formula: see text] controller is independently designed for the previous system to ensure good robustness properties of the closed-loop system against model uncertainties, neglecting dynamics and sensor noises. Finally, both above mentioned controllers are combined to design the robustified 2-DOF-MGPC controller using Youla parameterization method. Therefore, the obtained controller conserves the same good tracking dynamic that is provided by the primary 2-DOF-MGPC controller. It ensures the same good robustness properties which are produced by the robust [Formula: see text] controller. A wind turbine system equipped with a DFIG is controlled by the robustified 2-DOF-MGPC controller. Its dynamic behaviour is modelled by an unstructured-output multiplicative uncertainty plant. The controller performances are valid by comparison with those given through both controllers, which are primary 2-DOF-MGPC and robust [Formula: see text] controllers in time and frequency domains.
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Almeida, Alexsandro C. S., Tarlei A. Botrel, Steven R. Raine, Antonio P. de Camargo, Marinaldo F. Pinto i Conan A. Salvador. "Irrigation controller mechanically actuated by soil-water tension: II - Field evaluations". Revista Brasileira de Engenharia Agrícola e Ambiental 21, nr 5 (maj 2017): 298–303. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n5p298-303.
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ABSTRACT In this study, a field evaluation of the performance of an irrigation controller mechanically actuated by soil-water tension (SWT) was performed. The controller employs a tensiometer used as a sensor of SWT to directly control a mechanically actuated hydraulic valve. Six controllers were installed in an orchard to control the irrigation for six rows of plants over 64 days. Each controller controlled the irrigation of one lateral drip line. The drip irrigation system was gravity-fed from a water source placed 7 m above the soil surface. The SWT and the pressure in each lateral line were measured to evaluate the performance of the controllers. All the controllers tested in the field autonomously initiated and terminated the irrigation during the evaluation. Irrigation events were initiated when values close to the set soil-tension values were reached and were terminated at lower soil-tension values. As the SWT in the root zone was maintained close to the setup threshold plus 20% tolerance for at least 90% of the evaluation period, the performance of the controllers was considered satisfactory. The proposed controller was shown to be functional and was operated effectively for an SWT range of up to 30 kPa, which is commonly encountered under high-frequency irrigation conditions.
Rozprawy doktorskie na temat "FPD+I CONTROLLER"
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Meuwissen, R. H. G. "Waar controle en controleur elkaar ontmoeten". Maastricht : Maastricht : Universiteit Maastricht, Faculteit der Economische Wetenschappen en Bedrijfskunde ; University Library, Maastricht University [Host], 2005. http://arno.unimaas.nl/show.cgi?fid=12761.
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Buyukkeles, Umit. "Improved Torque And Speed Control Performance In A Vector-controlled Pwm-vsi Fed Surface-mounted Pmsm Drive With Conventional P-i Controllers". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614294/index.pdf.
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In this thesis, high performance torque and speed control for a surface-mounted permanent magnet synchronous machine (PMSM) is designed, simulated and implemented. A three-phase two-level pulse width modulation voltage-source inverter (PWM-VSI) with power MOSFETs is used to feed the PMSM.
The study has three objectives. The first is to compensate the voltage disturbance caused by nonideal characteristics of the voltage-source inverter (VSI). The second is to decouple the coupled variables in the synchronous reference frame model of the PMSM. The last is to design a load torque estimator in order to increase the disturbance rejection capability of the speed control. The angular acceleration required for load torque estimation is extracted through a Kalman filter from noisy velocity measurements.
Proposed methods for improved torque and speed control performance are verified through simulations and experimental tests. The drive system is modeled in Matlab/Simulink, and control algorithms are developed based on this model. The experimental drive system comprises a three-phase VSI and a 385 W surface-mounted PMSM. Control algorithms developed in the study have been implemented in a digital signal processor (DSP) board and tested comprehensively. With the use of the proposed methods, a considerable improvement of torque and speed control performance has been achieved.
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Du, Plooy Jon-Pierre. "Development of a converter-fed reluctance synchronous generator wind turbine controller". Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97015.
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Thesis (MEng)--Stellenbosch University, 2015.ENGLISH ABSTRACT: The growing contribution of wind energy to utility grids has sparked interest in small-scale wind turbines and thus a growing global cumulative installed capacity. Small-scale wind turbines find use in the saving of cost of electricity or for the carbon footprint reduction of small farms and small-holdings, as well as the electrification of rural communities. A goal of any wind turbine is to produce power at as low of a cost per unit energy as possible. Thus, a generator with a high power density and high efficiency is essential. The reluctance synchronous machine (RSM) is a strong competitor in this regard. Additionally, the RSM is a robust brushless topology that has good properties of manufacturability. However, studies published on the use of RSMs as generators in wind turbines is limited. This study serves to explore the performance and controllability of an RSM as a generator in a small-scale 9:2 kW wind turbine. For maximum power capture, it is desirable to have a wind turbine vary its rotor speed. However, there is a limit to the power that the generator may produce and so techniques are employed to reduce the captured power when operating above the rated wind speed. A turbine controller is developed that employs a speed-controlled maximum power point tracking (MPPT) technique for maximum power capture and soft-stalling of the blades to reduce power capture at excessive wind speeds. The RSM is modelled along with a turbine simulation model, complete with a wind source generator, to evaluate the performance of the system. Speed-controlled MPPT is known to sacrifice torque smoothness for fast tracking performance. To mitigate these harsh effects on the drivetrain, the speed reference of the generator is filtered to provide an average response to the optimal speed reference. This is shown to reduce the frequent and excessive speed, torque, and electrical power variations though optimal performance is not possible. However, any reduction on drivetrain fatigue that will maximise operation time of the turbine is considered an important gain. The RSM proves to have qualities that are applicable to wind turbine applications with its high efficiency, good manufacturability properties, low cost, and high robustness. Its higher power density over induction machines is also favourable though power electronics are required for optimal operation of the machine.
AFRIKAANSE OPSOMMING: Die groeiende bydrae van wind energie te nut roosters het aanleiding gegee tot belangstelling in kleinskaalse wind turbines en dus 'n groeiende w^ereldwye kumulatiewe geïnstalleerde kapasiteit. Kleinskaalse wind turbines vind ook gebruik in die besparing van koste van elektrisiteit, of vir die koolstofvoetspoor vermindering van klein plase en klein-hoewes, sowel as die elektrifisering van landelike gemeenskappe. Een van die doelwitte van enige wind turbine is om krag te produseer teen so laag van 'n koste per eenheid energie as moontlik. Dus, 'n kragopwekker met 'n hoë krag digtheid en hoë doeltreffendheid is noodsaaklik. Die reluktansie sinchroonmajien (RSM) is 'n sterk mededinger in hierdie verband. Daarbenewens is die RSM 'n robuuste borsellose topologie wat goeie eienskappe van vervaardigbaarheid het. Maar studies oor die gebruik van RSMs as kragopwekkers gepubliseer in die wind turbines is beperk. Hierdie studie dien om die prestasie te ondersoek en die beheerbaarheid van 'n RSM as 'n a kragopwekker in 'n klein-skaal 9:2 kW wind turbine te verken. Vir maksimum krag vang is dit wenslik dat die wind turbine sy rotor spoed wissel. Maar daar is 'n beperking op die krag wat die kragopwekker kan produseer en daarom work tegnieke gebruik om die gevange krag te verminder wanneer daar bo die gegradeerde wind spoed gewerk word. 'n Turbine beheerder word ontwikkel wat werk om 'n spoedbeheer maksimum kragpunt dop tegniek vir maksimum krag vang en die sagtestaking van die lemme krag vang deur oormatige wind spoed te verminder. Die RSM is gemodeleer saam met 'n turbine simulasie model kompleet met 'n wind bron kragopwekker om die prestasie van die stelsel te evalueer. Spoedbeheerde maksimum kragpunt dop is bekend om wringkrag gladheid vir 'n vinnige dop prestasie te offer. Om hierdie harde gevolge op die kragoorbringstelsel te versag is die spoed verwysing van die kragopwekker gefiltreer om 'n gemiddelde reaksie op die optimale spoed verwysing te verskaf. Dit word getoon om gereelde en hoë spoed, wringkrag en elektriese krag variases te verminder al is optimale prestasie nie moontlik nie. Enige afname van aandrystelsel moegheid wat operasie tyd van die turbine maksimeer word beskou as 'n belangrike gewin. Die RSM bewys eienskappe wat van toepassing is op die turbine aansoeke na aanleiding met sy hoë doeltreffendheid, goeie vervaardigbaarheid eienskappe, lae koste end ' hoë robuustheid. Sy hoër krag digtheid oor induksiemasjien is ook gunstig al is drywingselektronika nodig vir optimale werking van die masjien.
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Zelaya, de la Parra H. "Microprocessor-controlled cycloconverter for excitation of a doubly-fed induction generator". Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376697.
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Chaves, Juan Sebastián Solís. "Controle preditivo generalizado com horizonte deslizante e controle direto de potência deadbeat aplicados em sistemas eólicos baseados no gerador de indução de rotor bobinado". reponame:Repositório Institucional da UFABC, 2017.
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Orientador: Prof. Dr. Alfeu J. Sguarezi FilhoTese (doutorado) - Universidade Federal do ABC. Programa de Pós-Graduação em Energia, 2017.
Nesta pesquisa são propostos dois novos algoritmos de controle, operando a velocidade variável e robustos às variações nos parâmetros para um sistema eólico baseado no gerador de indução duplamente alimentado, cuja aplicação é realizada em condições normais de operação. Os controladores propostos são nomeados de Controle Direto de Potência (CDP) Deadbeat e do Controle Preditivo Generalizado com Horizonte Deslizante (CPG¿hd). O primeiro possui duas malhas de controle: uma para o desacoplamento do fluxo do estator e o controle das potências e a outra para o controle da corrente, essa malha é chamada de Deadbeat. O CDP calcula o vetor de tensão fornecido ao rotor a fim de garantir que a potência ativa e reativa atinjam seus valores de referência desejados. A dependência do algoritmo a parâmetros que tenham que ser sintonizados por meio de procedimentos heurísticos é nula quando é comparado com o controle Proporcional¿Integral ou Controle PI, sendo preciso somente calcular o coeficiente Gc. O segundo controlador, calcula os preditores para a corrente do rotor usando um horizonte de predição definido e assim obter as novas tensões do rotor que devem ser injetadas no sistema para controlar as potências ativa e reativa do estator com base nas equações do gerador. O CPG¿hd precisa de um parâmetro para sua sintonização chamado fator de peso do controlador, esse parâmetro faz parte da função de custo quadrática que deve ser minimizada, para obter um valor ótimo das tensões do rotor. Testes são feitos usando Matlab¿Simulink para os dois controladores operando sob condições normais de operação, ou seja: teste a velocidade fixa e teste a velocidade variável do rotor. Os mesmos testes são repetidos por meio de um protótipo de escala pequena disponível no LEPS . A dependência dos dois algoritmos às variações dos parâmetros foi também investigada, assim como a influência dos erros na estimativa desses parâmetros, obtendo-se um desempenho superior do controlador preditivo generalizado CPG¿hd sobre o CDP Deadbeat.
In this research two new control algorithms for a wind power system based on the Double Fed Induction Generator (DFIG) are proposed. The wind energy system is operating under normal conditions i.e. fixed rotor speed, variable rotor speed and under variations in DFIG parameters. The proposed controllers are named Direct Power Control (DPC) Deadbeat and Long¿range Generalized Predictive Control (GPC¿dq). The DPC calculates the sup- plied voltage vector to the rotor to ensure that the active and reactive power reaches their desired reference values. The algorithm dependence on parameters that have to be tuned by means of heuristic procedures is zero when its compared with the Proportional¿Integral (PI) Control, being necessary only estimate the Gc coeficient. The second controller evalu- ates the DFIG predictive rotor currents, using a defined long-range prediction horizon and thus obtain the new rotor voltages that have to be injected to controlling the active and reactive stator powers. The GPC¿dq needs a parameter for been tuned, this is called as a weighting factor and is a part of the quadratic cost function that has to be minimized, to obtain an optimal value of the rotor voltages. Tests are done using Matlab¿Simulink for the two controllers operating under normal operating conditions, ie: a fixed speed test and a variable rotor speed test. The same tests are repeated using a small scale prototype avai- lable in the LEPS. The dependence of the two algorithms on the parameter variations was also investigated, as well as the influence of the errors in the estimation of these parame- ters, obtaining a superior performance for the long¿range generalized predictive controller over the other one.
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Boris, Jakovljević. "Optimalno i suboptimalno podešavanje parametara robusnih linearnih regulatora necelog reda". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=94916&source=NDLTD&language=en.
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Rad je posvećen robusnom upravljanju sistemima čiji je linearni regulator i/ili dinamika necelog reda, kao i upravljačkim problemima gde regulator necelog reda u sebi poseduje i linearnu i nelinearnu dinamiku, a koji upravlja procesima čija dinamika može i linearna i nelinearna.The thesys is dedicated to robust control systems problems with linearcontrollers and/or process dynamics of noninteger order, as well as controlissues with combination of linear and nonlinear controllers of nonintegerorder that control either linear or nonlinear systems.
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Micael, Karlberg. "Soft sensor application on lactate controlled fed-batch cultivation for monoclonal antibody production". Thesis, Linköpings universitet, Teknisk biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117179.
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Monoclonal antibody producing cells are of great interest and used frequently in the field of biomedical research, diagnostics and therapy with increasing need for better systems to more efficiently produce antibodies at a lower costs. In this project three fed-batch cultivations of hybridoma cells (HB-8696) were cultured in a stirred tank reactor with the use of a soft sensor to monitor the lactate concentration and as well as a dielectric probe for biomass measurements. In addition, a protocol for growing the inoculum was also successfully produced and a previous batch cultivation was also analyzed which gave crucial information about stoichiometrically relation in the feed medium which was used in the fed-batch cultivations. The BioSenz Analyzer was used for on-line lactate concentration monitoring and was later used to control the feed profile to avoid overflow metabolism in two of the three fed-batch cultivations. However, nothing conclusive could be said about the lactate controller as of yet which needs further research.
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Dòria, Cerezo Arnau. "Modeling, Simulation and Control of Doubly-Fed Induction Machine Controlled by Back-to-Back converter". Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/5945.
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Aquesta Tesi estudia el control d'un sistema complex, un sistema d'emmagatzement d'energia cinètica, incloent les seves especificacions de control, modelat, disseny de controladors, simulacions, muntatge i validació experimental.Primerament, s'estudia l'interconnexió i control dels sistemes electromecànics. Es presenta el formalisme Hamiltonià (PCHS) en general, i després particularitzant en els sistemes electromecànics, inclòs els sistemes d'estructura variable (VSS).
L'IDA-PBC (Interconnection and damping assignment-passivity based control) és una tècnica de control basat en els PCHS. En aquesta Tesi s'estudien el problemes que apareixen en controlar, per IDA-PBC, sortides de grau relatiu u quan el paràmetres nominals del controlador són incerts. Per evitar-los es proposa introduir una acció integral que pot ésser interpretada dins l'estructura Hamiltoniana.
En aquesta Tesi també es presenten dues modificacions que permeten millorar el rang d'aplicacions de la tècnica IDA-PBC. Primer, es demostra que el fet de descomposar la tècnica de l'IDA-PBC en deformar la funció d'energia i una injecció de fregament, redueix el conjunt de sistemes que es poden estabilitzar mitjançant aquest mètode. Per evitar aquest problema, es proposa fer simultàniament els dos passos donant lloc a l'anomenat SIDA-PBC. Per altre costat, el mètode IDA-PBC requereix el coneixement de la funció energia (o Hamiltonià). Això representa un problema perquè, en general, el punt d'equilibri depèn de paràmetres incerts. En aquest treball es desenvolupa una metodologia per seleccionar l'estructura Hamiltoniana que redueix aquesta dependència dels paràmetres. Aquesta tècnica permet millorar la robustesa dels les sortides d'ordre relatiu superior a u.
El sistema d'emmagatzement d'energia cinètica consisteix en una màquina d'inducció doblament alimentada (DFIM) amb un volant d'inèrcia, controlada pel rotor per un convertidor de potència back-to-back (B2B). L'objectiu és gestionar el flux d'energia entre la DFIM i una càrrega local connectada a la xarxa, commutant entre diferents punts de funcionament. Per això es planteja una gestió de l'energia, basada en la velocitat òptima de la DFIM.
Pel què fa al control de la DFIM, es proposa un nou esquema de control que ofereix importants avantatges, i que és considerablement més senzill que el mètode clàssic, el vector control. Aquest nou controlador permet una fàcil descomposició de les potències activa i reactiva de l'estator, i el seu control a través de les tensions de rotor. Aquest disseny s'obté aplicant el procediment que millora la robustesa de l'IDA-PBC.
S'han estudiat d'altres controladors, com el vector control clàssic. També a partir de la tècnica IDA-PBC, on l'equació en derivades parcials que apareix en aplicar el mètode es pot resoldre fixant l'energia en llaç tancat, i afegint nous termes a la matriu d'interconnexió. Per obtenir un controlador definit globalment s'afegeix un terme de fregament depenent dels estats, que desacobla la part elèctrica i mecànica del sistema. Finalment, també es prova que mitjançant el SIDA-PBC es pot modelar l'energia total (elèctrica i mecànica) de la DFIM. Tots aquest controladors han estat simulats i comparats. El controlador robust IDA-PBC s'ha validat experimentalment amb uns resultats satisfactoris.
A la Tesi també es presenta un controlador que permet el flux bidireccional de potència pel B2B. L'estudi de la dinàmica zero adverteix que les tècniques de control estàndard no garanties en l'estabilitat en ambdós direccions, i per això s'utilitza un controlador IDA-PBC. Pel disseny s'utilitza un model basat en GSSA (generalized state space averaging), on es descomposa i es trunca el sistema per determinades freqüències, i que permet expresar els objectius de control (tensió constant al bus de contínua i factor de potència unitari) com un problema de regulació. Les simulacions i els resultats experimentals validen, tant la llei de control, com les simplificacions efectuades.
Els controladors proposats i validats experimentalment són usats, finalment, per implementar la gestió de potència del sistema d'emmegatzement d'energia cinètica. Els resultats confirmen el bon comportament del sistema i dels controladors IDA-PBC proposats.
This Thesis studies a complex multidomain system, the Flywheel Energy Storage System, including the control objectives specification, modeling, control design, simulation, experimental setup assembling and experimental validation stages.
The port interconnection and control of electromechanical systems is studied. The port Hamiltonian formalism is presented in general, and particularized for generalized electromechanical systems, including variable structure systems (VSS).
Interconnection and damping assignment-passivity based control (IDA-PBC) is a well known technique for port Hamiltonian systems (PCHS). In this Thesis we point out the kind of problems that can appear in the closed-loop structure obtained by IDA-PBC methods
for relative degree one outputs, when nominal values are used in a system with uncertain parameters. To correct this, we introduce an integral control, which can be cast into the Hamiltonian framework.
This Thesis also presents two new approaches which improve the range of applicability of the IDA-PBC technique.
First, we show that the standard two-stage procedure used in IDA-PBC consisting of splitting the control action into the sum of energy-shaping and damping injection terms is not without loss of generality, and effectively reduces the set of systems that can be stabilized with IDA-PBC. To overcome this problem we suggest to carry out simultaneously both stages and refer to this variation of the method as SIDA-PBC.
Secondly, we present an improvement of the IDA-PBC technique. The IDA-PBC method requires the knowledge of the full energy (or Hamiltonian) function. This is a problem because, in general, the equilibrium point which is to be regulated depends on uncertain parameters. We show how select the target port-Hamiltonian structure so that this dependence is reduced. This new approach allows to improve the robustness for higher relative degree outputs.
The Flywheel Energy Storage System consists of a doubly-fed induction machine (DFIM), controlled through the rotor voltage by a power electronics subsystem (a back-to-back AC/AC converter (B2B)), and coupled to flywheel. The control objective is to optimally regulate the power flow between the DFIM and a local load connected to the grid, and this is achieved by commuting between different steady-state regimes. A police management based on the optimal speed for the DFIM is proposed.
In this Thesis we propose a new control scheme for the DFIM that offers significant advantages, and is considerably simpler, than the classical vector control method. This controller allows an easy decomposition of the active and reactive powers on the stator side and their regulation, acting on the rotor voltage, via stator current control. This design was obtained applying the new robust IDA-PBC procedure.
Other controllers are also designed along the dissertation. The classical vector control is studied. We also apply the classic IDA-PBC technique. It is shown that the partial differential equation that appears in this method can be circumvented by fixing the desired closed-loop total energy and adding new terms to the interconnection structure. Furthermore, to obtain a globally defined control law we introduce a state--dependent damping term that has the nice interpretation of effectively decoupling the electrical and mechanical parts of the system. This results in a globally convergent controller parameterized by two degrees of freedom. Finally, we also prove that with SIDA-PBC we can shape the total energy of the full (electrical and mechanical) dynamics of the DFIM. These different controllers (vector control, IDA-PBC, SIDA-PBC and robust IDA-PBC) are simulated and compared. The IDA-PBC robust controller is also experimentally tested and shown to work satisfactorily.
A controller able to achieve bidirectional power flow for the B2B converter is presented. Standard techniques cannot be used since it is shown that no single output yields a stable zero dynamics for power flowing both ways. The controller is computed using standard IDA-PBC techniques for a suitable generalized state space averaging truncation of the system, which transforms the control objectives, namely constant output voltage dc-bus and unity input power factor, into a regulation problem. Simulation and experimental results for the full system confirm the correctness of the simplifications introduced to obtain the controller.
The proposed and tested controllers for the DFIM and the B2B are used to implement the power management policy. These results show a good performance of the flywheel energy storage system and also validate the IDA-PBC technique, with the proposed improvements.
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Pimentel, Guilherme Araujo. "Controle robusto por realimentação linearizante parcial de bioreatores em modo de operação "FED-BATCH"". Pontifícia Universidade Católica do Rio Grande do Sul, 2010. http://hdl.handle.net/10923/3149.
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Previous issue date: 2010This dissertation aims to use a general model to describe the growth of both bacteria Escherichia Coli as yeast Saccharomyces Cerevisiae in a bioreactor on fed-batch mode. In general, to maximize the production of biomass (microorganisms) by controlling the substrate (food) injected into the bioreactor. By the principle of bottle-neck, the maximum yield is obtained when the substrate level is maintained at a certain critical value which depends on biological variables of the process (which vary in time) and certain parameters with high degree of uncertainty. An alternative approach is the control of the by-product (acetate in the case of E. Coli or ethanol in the case of S. Cervisiae ) which should be maintained at levels close to zero and thus entire substrate is used in the production of biomass. Through the nonlinear model of the dynamic growth of the microorganism, it is proposed in this dissertation a robust control law based on the idea partial feedback linearization, in order to avoid measure a large number of biological variables di cult instrumentation. To improve the dynamic performance of the system, is also proposed a mechanism for online estimation and parametric adaptation of the reaction rate of glucose oxidation. Using the description of nonlinearities with the quasi-LPV approach and the formulation of stability conditions through linear matrix inequalities (LMIs), is designed a free linear dynamic, yield of feedback linearization, to ensure the robust stability (related to nonlinearities not canceled and parametric variations)in closed loop and also a certain performance. To verify the behavior of the proposed methodology are conducted several tests on simulations using the platform Matlab=Simulinkr, where is possible to study the behavior of the proposed strategy with regard to jobs available in the literature.
Esta dissertação apresenta um modelo geral que descreve a dinâmica do crescimento tanto da bactéria Escherichia Coli quanto da levedura Saccharomyces Cerevisiae quando produzidas em bioreatores operando no modo descontínuo com alimentação controlada (fed-batch). Em geral, procura-se maximizar a produção da biomassa (microorganismos) através do controle do substrato (alimento) injetado ao bioreator. Pelo princípio do bottle-neck, a máxima produtividade é obtida quando o nível de substrato é mantido em um determinado valor crítico que depende de variáveis biológicas do processo (que variam ao longo do tempo) e de certos parâmetros com elevado grau de incerteza. Uma alternativa a esta abordagem é através do controle do produto secundário (acetato no caso da E. Coli ou etanol no caso da S. Cervisiae) o qual deve ser mantido em níveis próximos a zero e desta forma todo o substrato é utilizado na produção de biomassa. A partir do modelo não linear da dinâmica de crescimento do microorganismo, propõe-se nesta dissertação uma lei de controle robusta baseada na ideia de realimentação linearizante parcial com o objetivo de evitar a medição de um elevado número de variáveis biológicas de difícil instrumentação. Para melhorar o desempenho dinâmico do sistema, também é proposto um mecanismo de adaptação paramétrica para a estimação online da taxa de reação da oxidação da glicose. Utilizando a descrição das não linearidades através da abordagem quasi-LPV e a formulação das condições de estabilidade por desigualdades matriciais lineares (LMIs), projeta-se a dinâmica linear livre, resultante da realimentação linearizante, de maneira a garantir a estabilidade robusta (em relação a não linearidades não canceladas e variações paramétricas) em malha fechada e também um certo desempenho. Para verificar o comportamento da metodologia proposta são realizados vários testes em simulações utilizando a plataforma Matlab=Simulinkr, onde estuda-se o comportamento da estratégia proposta em relação a trabalhos disponíveis na literatura especializada.
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Royakkers, Cornelia Henrica Maria. "De controle over de politie in Engeland en Wales". [Deventer] : Maastricht : Gouda Quint ; University Library, Maastricht University [Host], 1997. http://arno.unimaas.nl/show.cgi?fid=5785.
Pełny tekst źródłaKsiążki na temat "FPD+I CONTROLLER"
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Verant, Lise-Marie. Quality controlled production in sheet-fed printing. London: LCP, 2003.
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Garcia-Cerrada, Aurelio. Observer-based field-orientated controller for an inverter-fed traction induction motor drive. Birmingham: University of Birmingham, 1990.
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Automating with SIMATIC S7-1200: Hardware components, programming with STEP 7 basic in LAD and FBD, visualization with HMI basic panels. Erlangen: Publicis Publishing, 2011.
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Chikurov, Nikolay, i Nikolay Levizi. Construction of discrete-logical control systems for electroautomatics. ru: INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1852441.
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The textbook discusses engineering methods of analysis and synthesis of discrete logic control systems of industrial mechanisms based on the apparatus of logic algebra and cyclograms of the operation of these mechanisms. New methods have been developed that make it possible to synthesize complex control systems on various element bases fairly quickly. Examples of designing control systems for machine-tool electrical automation devices are given. Students master the methodology of programming logic controllers in the instrumental programming environment of the ISaGRAF 6.5 ASP version using the FBD functional block language.
Meets the requirements of the federal state educational standards of higher education of the latest generation.
For students of mechanical engineering specialties, researchers, as well as specialists involved in the design of discrete logic control systems for various industrial mechanisms.
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Werahera, Priya N. Supervisory control of a doubly-fed machine. 1986.
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Brassfield, William R. Direct torque control for brushless doubly-fed machines. 1993.
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Berger, Hans. Automating with STEP 7 in LAD and FBD: SIMATIC S7-300/400 Programmable Controllers. Publicis MCD Werbeagentur GmbH, 2014.
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Berger, Hans. Automating with STEP 7 in LAD and FBD: SIMATIC S7-300/400 Programmable Controllers. Wiley-VCH, 2008.
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Berger, Hans. Automating with STEP 7 in LAD and FBD: SIMATIC S7-300/400 Programmable Controllers. Wyd. 3. Wiley-VCH, 2006.
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Berger, Hans. Automating with STEP 7 in LAD and FBD: SIMATIC S7-300/400 Programmable Controllers. Wyd. 2. Wiley-VCH, 2001.
Znajdź pełny tekst źródłaCzęści książek na temat "FPD+I CONTROLLER"
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Jha, Aditya Nath, Bhavnesh Kumar i Arjun Tyagi. "Solar Fed Speed Control of Water Pumping System Using Constant Voltage Controlled MPPT Technique and PI Controller". W Lecture Notes in Electrical Engineering, 327–35. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0969-8_33.
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Chuo, H. S. E., M. K. Tan, H. J. Tham i K. T. K. Teo. "Q-Learning-Based Controller for Fed-Batch Yeast Fermentation". W Developments in Sustainable Chemical and Bioprocess Technology, 219–25. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-1-4614-6208-8_28.
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Viji, K., K. Chitra i K. Uma Maheswari. "Robust PV Fed Discrete Controller for Heating and Lighting Applications". W Intelligent Manufacturing and Energy Sustainability, 697–704. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4443-3_67.
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Kar, Biranchi Narayan, Paulson Samuel i Bandi Mallikarjuna Reddy. "Photovoltaic Array Fed Indirect Vector-Controlled Induction Motor Drive for EV Transportation System Using Brain Emotional Learning-Based Intelligent Controller". W Transactions on Computer Systems and Networks, 147–63. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2184-1_7.
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Roeva, Olympia, i Tsonyo Slavov. "Fed-Batch Cultivation Control Based on Genetic Algorithm PID Controller Tuning". W Numerical Methods and Applications, 289–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18466-6_34.
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Senthilnathan, A., P. Palanivel i R. Balakrishnan. "SAZZ Converter Fed Fuzzy Logic Speed Controlled BLDC Motor Drive". W International Conference on Artificial Intelligence for Smart Community, 953–59. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-2183-3_90.
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Aijaz, Md, T. Muthamizhan i T. Venkateswarlu. "An Intelligent Fuzzy Controlled Microgrid Fed by Distribution Generation Sources". W Lecture Notes in Electrical Engineering, 467–77. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4943-1_43.
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Jha, Aditya Nath, Bhavnesh Kumar i Arjun Tyagi. "Constant Voltage Controlled MPPT for PV Fed Water Pumping System". W Lecture Notes in Electrical Engineering, 105–17. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7788-6_8.
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Srilakshmi, Koganti, Sravanthy Gaddameedhi, Uday Kumar Neerati, Surender Reddy Salkuti, Ponamanenni Anoop Rao, Thattiparthi Pavan Kumar i Machidi Akshith. "Performance Analysis of Fuzzy-Based Controller for Wind and Battery Fed UPQC". W Power Quality in Microgrids: Issues, Challenges and Mitigation Techniques, 217–41. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2066-2_11.
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Raveendhra, Dogga, Padmanabh Thakur i Abhisekh Chauhan. "FPGA Controlled Power Conditioning System for Solar PV Fed PMDC Motor". W Lecture Notes in Electrical Engineering, 321–28. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_33.
Pełny tekst źródłaStreszczenia konferencji na temat "FPD+I CONTROLLER"
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Meihua, Xu, Ran Feng i Chen Zhangjin. "Fractal scan IP core for the FPD gray scale controller". W the 2008 International Conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1509315.1509338.
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Chen, Shih-Lun, Hsin-Ju Tsai, Ting-Lan Lin i Ho-Yin Lee. "Block-based content adaptive backlight controller VLSI design for local dimming LCDs". W 2016 23rd International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD). IEEE, 2016. http://dx.doi.org/10.1109/am-fpd.2016.7543620.
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Feytout, Benjamin, Patrick Lanusse, Jocelyn Sabatier i Serge Gracia. "Robust CRONE Design for a Variable Ratio Planetary Gearing in a Variable Speed Wind Turbine". W ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47842.
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Most wind turbines installed have traditional architectures: double-fed asynchronous machine or direct drive with full conversion, both containing several levels of control composed of PI controllers. In our application, a robust 3rd-generation-CRONE controller is used to manage a planetary gearing ratio upstream of a synchronous generator directly connected to the grid. Thus, the speed of the low shaft is controlled and unlike other architectures, no system of power electronics is required for conversion. This CRONE approach is a robust control methodology based on fractional order differentiation.
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Tao, Jian-feng, Xuan Wang, Liu-qing Yang i Feng-rong Zhang. "Nonovershooting position control for unidirectional proportional pump controlled asymmetric cylinder with proportional controller". W 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2015. http://dx.doi.org/10.1109/fpm.2015.7337235.
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Jin, Yongshun, YangQuan Chen, Chunyang Wang i Ying Luo. "Fractional Order Proportional Derivative (FOPD) and FO[PD] Controller Design for Networked Position Servo Systems". W ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87662.
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This paper considers the fractional order proportional derivative (FOPD) controller and fractional order [proportional derivative] (FO[PD]) controller for networked position servo systems. The systematic design schemes of the networked position servo system with a time delay are presented. It follows from the Bode plot of the FOPD system and the FO[PD] that the given gain crossover frequency and phase margin are fulfilled. Moreover, the phase derivative w.r.t. the frequency is zero, which means that the closed-loop system is robust to gain variations at the given gain crossover frequency. However, sometimes we can not get the controller parameters to meet our robustness requirement. In this paper, we have studied on this situation and presented the requirement of the gain cross frequency, and phase margin in the designing process. For the comparison of fractional order controllers with traditional integer order controller, the integer order proportional integral differential (IOPID) was also designed by using the same proposed method. The simulation results have verified that FOPD and FO[PD] are effective for networked position servo. The simulation results also reveal that both FOPD controller and FO[PD] controller outperform IO-PID controller for this type of system.
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Qiu, Hongchu, Qin Zhang, John F. Reid i Duqiang Wu. "Nonlinear Feedforward-Plus-PID Control for Electrohydraulic Steering Systems". W ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0774.
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Abstract This paper presents the development of a nonlinear feedforward-plus-Proportional-Integral-Derivative (FPID) controller for electrohydraulic (E/H) steering on wheel-type tractors. An E/H steering system is a typical nonlinear system with deadband, saturation, asymmetric flow gain, time delay, and other nonlinear behaviors. Conventional PID controllers are incapable of achieving accurate steering control effectively on such nonlinear systems. In this research, an FPID controller was developed for effective and accurate steering control. The feedforward loop in this controller was designed to compensate for the deadband of the E/H system. The PID loop was designed to compensate the tracking error in steering control. A coordinated nonlinear gain function was designed to change the PID loop gain based on the level of the tracking error. This FPID controller has significantly improved the steering accuracy comparing with that from a PID controller. Test results showed that the maximum tracking error in steering angle was less than 0.5° corresponding to a sinusoid steering command of ±5° at the command frequency of 0.1 Hz. The maximum overshoot was less than 12% and the rise time was less than 0.25 s corresponding to a steering command of 5° step input. This FPID controller achieved effective and accurate steering control on agricultural tractor E/H steering systems.
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Shang, Bo, Chengdong Wu, Yunzhou Zhang i YangQuan Chen. "Analysis of Maximum Possible Sampling Period for a Real-Time Vision-Based Control System". W ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68355.
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Drone control systems are experiencing more and more challenges when integrating with more sensors. For example, the drone visual servoing systems often have a large sampling period due to limited on-board computing capability. Therefore, controllers that can tolerate a large sampling period are needed. Our previous work showed that a fractional order proportional-derivative controller (FOPD controller) can tolerate a larger sampling period than an integer order proportional-integralderivative controller (IOPID controller). In this paper, we verified this conclusion using control system stability criteria to estimate the largest sampling periods and time-domain simulation.
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Bártfai, András, Asier Barrios i Zoltan Dombovari. "Stability Analysis of a One Degree-of-Freedom Robot Model With Sampled Digital Acceleration Feedback Controller in Turning". W ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-90937.
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Abstract This study investigates the stability of robots in machining. The goal is to improve the dynamic performance of robots using an additional acceleration signal fed back through the conventional built-in proportional-derivative controller provided by the manufacturer. The structure of the robot is modelled with a simple one degree-of-freedom lumped model. The control signals are fed back via a linear spring and damping. The time delays of feedback controllers are considered as zero-order holds, which results in sawtooth-like time-periodic time delays. The resulting equation of motion is an advanced delay differential equation. The semidiscretization method is shown for such systems with multiple sampled digital delays. First, we establish the stable regions in the plane of the sampling delay and the gain of the acceleration signal without machining. Then we show the possibility to improve stability in the simplest possible cutting case using the additional acceleration feedback controller compared to the cases without any controller or using only the proportional-derivative controller.
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Li, Tingxue, Dingyu Xue i Xinshu Cui. "An Approach to Design Controllers for MIMO Fractional Order System Based on RFN Method". W ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-69856.
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Abstract Fractional calculus has attracted more and more attention and is applied in different fields. However the controller design techniques for fractional order systems mostly focus on single input single output (SISO) ones. This paper deals with the design of controllers for multiple inputs multiple outputs (MIMO) fractional order systems. A method to synthetize controller based on the eigenvalue function and singular value decomposition (SVD) is proposed with aid of fractional order transfer function (FOTF) MATLAB toolbox for the computation and fitting. Instead of setting specification to the controller, the method proposed aiming at achieving the target closed-loop control effect of the system as a whole. Several models evolved from fractional-order Proportional-Integral-Derivative (fPID) controller are selected to form the designed multivariable controller. The effectiveness and robustness of the proposed method are illustrated by an example via simulation.
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Bashir, Ahmed, Xiaoting Rui i Adeel Shehzad. "Ride Comfort Enhancement of MR-Damped Vehicle Suspension System Based on Fractional Order Fuzzy PI+D Controller". W ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97739.
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Abstract In this paper, a fractional order fuzzy proportional-integral plus differential (FOFPI+D) controller is presented for nonlinear vehicle semi-active suspension system (SAS). The control goal is to meliorate the ride quality level by minimizing the root mean square of vehicle body vertical acceleration (RMSVBVA) and maintaining suspension travel. The FOFPI+D controller is realized using non-integer differentiator operator in fuzzy proportional integral (FPI) controller plus the derivative (D) action with additional fractional differentiator. A dynamical model of four degrees–of–freedom vehicle suspension system incorporating magnetorheological dampers (MRD’s) is derived and simulated using Matlab/Simulink software. The performance of the semi-active suspension system using FOFPI+D controller is compared to MR-passive suspension system. The simulation results prove that semi-active suspension system controlled using FOFPI+D outperform and offer better comfort ride under road profiles such as random and bump.
Raporty organizacyjne na temat "FPD+I CONTROLLER"
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Mwebe, Robert, Chester Kalinda, Ekwaro A. Obuku, Eve Namisango, Alison A. Kinengyere, Moses Ocan, Ann Nanteza, Savino Biryomumaisho i Lawrence Mugisha. Epidemiology and effectiveness of interventions for Foot and Mouth Disease in Africa: A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, listopad 2022. http://dx.doi.org/10.37766/inplasy2022.11.0039.
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Review question / Objective: What is the epidemiology and effectiveness of control measures for foot and mouth disease in African countries?’ PICOS: Description of elements Population/ problem/Setting: Artiodactyla (cloven ungulates), domestic (cattle, sheep, goats, and pigs), camels and wildlife (buffaloes, deer, antelope, wild pigs, elephant, giraffe, and camelids) affected by Foot and Mouth Disease (FMD) or Hoof and Mouth Disease (HMD) caused by the Foot and Mouth Disease Virus (FMDV) in Africa. Intervention: Prevention measures: vaccination, ‘biosafety and biosecurity’, sensitization of the public. Control measures: quarantine, movement control, closure of markets and stock routes, mouth swabbing of animals with infected materials (old technique that is no long applicable), culling, mass slaughter, stamping out and any other interventions or control measures generally accepted by the ‘community of practice’ of animal health practitioners. Comparator: areas that did not have any control activities for FMD, in head-to-head comparisons in the same study. Outcome: epidemiological outcomes: incidence, prevalence, patterns or trends, clinical symptoms, and risk factors. Effectiveness outcomes: success, and usefulness of the interventions measured as averted deaths, illness and infections, and costs associated with the interventions (cost–effectiveness). Study design: epidemiological designs include cohort design for incidence, cross sectional for prevalence and case-control for clinical symptoms and risk factors. Interventional designs include randomized controlled trials, cluster randomized trials, quasi-experimental designs – controlled before and after, interrupted time series, [regression discontinuity design, difference-in-difference, and propensity score matching]. Timelines: 1900 – 2022.
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Liu, Yuzhou, Yang Zhang, Zhijia Zhang, Qiang Fu, Yin Fu, Zhixiang Li, Chenyu Zhang i Xiaoyu Wang. Efficacy of Li-Zhong Decoction in the treatment of patients with functional dyspepsia: A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, kwiecień 2022. http://dx.doi.org/10.37766/inplasy2022.4.0029.
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Review question / Objective: To evaluate the safety and efficacy of LZD in the treatment of FD. In this study, all theory is adopted the soup randomized controlled trials for the treatment of functional dyspepsia. Condition being studied: Although the disease is not life-threatening, it can take a psychological and financial toll on sufferers. At present, the efficacy of conventional treatment is not significant. Previous studies have shown that Lizhong decoction is safe and effective, but there is a lack of systematic evaluation. The purpose of this study was to systematically study the efficacy of LZD in the treatment of FD patients.
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Weinberg, Zwi G., Adegbola Adesogan, Itzhak Mizrahi, Shlomo Sela, Kwnag Jeong i Diwakar Vyas. effect of selected lactic acid bacteria on the microbial composition and on the survival of pathogens in the rumen in context with their probiotic effects on ruminants. United States Department of Agriculture, styczeń 2014. http://dx.doi.org/10.32747/2014.7598162.bard.
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This research project was performed in context of the apparent probiotic effect of selected lactic acid bacteria (LAB) silage inoculants on the performance of ruminants (improved feed intake, faster live-weight gain, higher milk yields and improved feed efficiency). The overall objective was to find out how LAB affect ruminant performance. The project included several “chapters” as follows: 1. The effect of LAB silage inoculants on the survival of detrimental bacteria in rumen fluid, in vitro study (Weinberg et al., The Volcani Center). An in vitro model was developed to study the interaction between selected LAB and an E. coli strain tagged with green fluorescence protein (GFP) in buffered RF. Results indicated that both LAB inoculants and E. coli survived in the RF for several days; both LAB inoculants and LAB-treated silages did not affect survival of E. coli in rumen fluid in vitro. The effect of feeding baled wheat silages treated with or without three selected LAB silage inoculants on the performance of high-lactating cows (Weinberg et al., The Volcani Center). Treatments included control (no additive), Lacobacillusbuchneri40788 (LB), Lactobacillus plantarumMTD1 40027 (LP) and Pediococcuspentosaceus30168 (PP), each applied at 10⁶ cfu/g FM. The silages were included in the TMR of 32 high milking Holstein cows in a controlled feeding experiment. All baled silages were of good quality. The LB silage had the numerically highest acetic acid and were the most stable upon aerobic exposure. The cows fed the LB silages had the highest daily milk yields, percent milk fat and protein. The microbiome of baled wheat silages and changes during ensiling of wheat and corn (Sela et al., The Volcani Center). Bacterial community of the baled silages was dominated mainly of two genera in total, dominated by Lactobacillus and Clostridium_sensu_stricto_12 with 300 other genera at very low abundance. Fungal community was composed mainly of two genera in total, dominated by Candida and Monascuswith 20 other genera at very low abundance. In addition, changes in the microbiome during ensiling of wheat and corn with and without addition of L. plantarumMTD1 was studied in mini-silos. Overall 236 bacterial genera were identified in the fresh corn but after 3 months Lactobacillus outnumbered all other species by acquiring 95% of relative abundance. The wheat silage samples are still under analysis. The effect of applying LAB inoculants at ensiling on survival of E. coli O157:H7 in alfalfa and corn silages(Adesogan et al., University of Florida). E. coli (10⁵ cfu/g) was applied to fresh alfalfa and corn at ensiling with or without L. plantarumor L. buchneri. The pathogen was added again after about 3 moths at the beginning of an aerobic exposure period. The inoculants resulted in faster decrease in pH as compared with the control (no additives) or E. coli alone and therefore, the pathogen was eliminated faster from these silages. After aerobic exposure the pathogen was not detected in the LAB treated silages, whereas it was still present in the E. coli alone samples. 5. The effect of feeding corn silage treated with or without L. buchnerion shedding of E. coli O157:H7 by dairy cows (Adesogan et al., UFL). BARD Report - Project 4704 Page 2 of 12 Five hundred cows from the dairy herd of the University of Florida were screened for E. coli shedding, out of which 14 low and 13 high shedders were selected. These cows were fed a total mixed ration (TMR) which was inoculated with E. coli O157:H7 for 21 days. The TMR included corn silage treated with or without L. buchneri. The inoculated silages were more stable upon aerobic exposure than the control silages; the silage inoculant had no significant effect on any milk or cow blood parameters. However, the silage inoculant tended to reduce shedding of E. coli regardless of high or low shedders (p = 0.06). 6. The effect of feeding baled wheat silages treated with or without three selected LAB silage inoculants on the rumen microbiome (Mizrahi et al., BGU). Rumen fluid was sampled throughout the feeding experiment in which inoculated wheat silages were included in the rations. Microbial DNA was subsequently purified from each sample and the 16S rRNA was sequenced, thus obtaining an overview of the microbiome and its dynamic changes for each experimental treatment. We observed an increase in OTU richness in the group which received the baled silage inoculated with Lactobacillus Plantarum(LP). In contrast the group fed Lactobacillus buchneri(LB) inoculated silage resulted in a significant decrease in richness. Lower OTU richness was recently associated in lactating cows with higher performance (Ben Shabatet al., 2016). No significant clustering could be observed between the different inoculation treatments and the control in non metric multi-dimentional scaling, suggesting that the effect of the treatments is not the result of an overall modulation of the microbiome composition but possibly the result of more discrete interactions. Significant phylum level changes in composition also indicates that no broad changes in taxa identity and composition occurred under any treatment A more discrete modulation could be observed in the fold change of several taxonomic groups (genus level analysis), unique to each treatment, before and after the treatment. Of particular interest is the LB treated group, in which several taxa significantly decreased in abundance. BARD Report - Project 4704 Page 3 of 12
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Borch, Thomas, Yitzhak Hadar i Tamara Polubesova. Environmental fate of antiepileptic drugs and their metabolites: Biodegradation, complexation, and photodegradation. United States Department of Agriculture, styczeń 2012. http://dx.doi.org/10.32747/2012.7597927.bard.
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Many pharmaceutical compounds are active at very low doses, and a portion of them regularly enters municipal sewage systems and wastewater-treatment plants following use, where they often do not fully degrade. Two such compounds, CBZ and LTG, have been detected in wastewater effluents, surface waters, drinking water, and irrigation water, where they pose a risk to the environment and the food supply. These compounds are expected to interact with organic matter in the environment, but little is known about the effect of such interactions on their environmental fate and transport. The original objectives of our research, as defined in the approved proposal, were to: Determine the rates, mechanisms and products of photodegradation of LTG, CBZ and selected metabolites in waters exposed to near UV light, and the influence of DOM type and binding processes on photodegradation. Determine the potential and pathways for biodegradation of LTG, CBZ and selected metabolites using a white rot fungus (Pleurotusostreatus) and ADP, and reveal the effect of DOM complexation on these processes. Reveal the major mechanisms of binding of LTG, CBZ and selected metabolites to DOM and soil in the presence of DOM, and evaluate the effect of this binding on their photodegradation and/or biodegradation. We determined that LTG undergoes relatively slow photodegradation when exposed to UV light, and that pH affects each of LTG’s ability to absorb UV light, the efficiency of the resulting reaction, and the identities of LTG’sphotoproducts (t½ = 230 to 500 h during summer at latitude 40 °N). We observed that LTG’sphotodegradation is enhanced in the presence of DOM, and hypothesized that LTG undergoes direct reactions with DOM components through nucleophilic substitution reactions. In combination, these data suggest that LTG’s fate and transport in surface waters are controlled by environmental conditions that vary with time and location, potentially affecting the environment and irrigation waters. We determined that P. ostreatusgrows faster in a rich liquid medium (glucose peptone) than on a natural lignocellulosic substrate (cotton stalks) under SSF conditions, but that the overall CBZ removal rate was similar in both media. Different and more varied transformation products formed in the solid state culture, and we hypothesized that CBZ degradation would proceed further when P. ostreatusand the ᵉⁿᶻʸᵐᵃᵗⁱᶜ ᵖʳᵒᶠⁱˡᵉ ʷᵉʳᵉ ᵗᵘⁿᵉᵈ ᵗᵒ ˡⁱᵍⁿⁱⁿ ᵈᵉᵍʳᵃᵈᵃᵗⁱᵒⁿ. ᵂᵉ ᵒᵇˢᵉʳᵛᵉᵈ ¹⁴C⁻Cᴼ2 ʳᵉˡᵉᵃˢᵉ ʷʰᵉⁿ ¹⁴C⁻ᶜᵃʳᵇᵒⁿʸˡ⁻ labeled CBZ was used as the substrate in the solid state culture (17.4% of the initial radioactivity after 63 days of incubation), but could not conclude that mineralization had occurred. In comparison, we determined that LTG does not degrade in agricultural soils irrigated with treated wastewater, but that P. ostreatusremoves up to 70% of LTG in a glucose peptone medium. We detected various metabolites, including N-oxides and glycosides, but are still working to determine the degradation pathway. In combination, these data suggest that P. ostreatuscould be an innovative and effective tool for CBZ and LTG remediation in the environment and in wastewater used for irrigation. In batch experiments, we determined that the sorption of LTG, CBZ and selected metabolites to agricultural soils was governed mainly by SOM levels. In lysimeter experiments, we also observed LTG and CBZ accumulation in top soil layers enriched with organic matter. However, we detected CBZ and one of its metabolites in rain-fed wheat previously irrigated with treated wastewater, suggesting that their sorption was reversible, and indicating the potential for plant uptake and leaching. Finally, we used macroscale analyses (including adsorption/desorption trials and resin-based separations) with molecular- level characterization by FT-ICR MS to demonstrate the adsorptive fractionation of DOM from composted biosolids by mineral soil. This suggests that changes in soil and organic matter types will influence the extent of LTG and CBZ sorption to agricultural soils, as well as the potential for plant uptake and leaching.