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In this paper, a three-dimensional cancer model was considered using the Caputo-Fabrizio-Caputo and the new fractional derivative with Mittag-Leffler kernel in Liouville-Caputo sense. Special solutions using an iterative scheme via Laplace transform, Sumudu-Picard integration method and Adams-Moulton rule were obtained. We studied the uniqueness and existence of the solutions. Novel chaotic attractors with total order less than three are obtained.
José Francisco Gómez-Aguilar; María Guadalupe López-López; Victor Manuel Alvarado-Martínez; Dumitru Baleanu; Hasib Khan. Chaos in a Cancer Model via Fractional Derivatives with Exponential Decay and Mittag-Leffler Law. Entropy 2017, 19, 681 .
AMA StyleJosé Francisco Gómez-Aguilar, María Guadalupe López-López, Victor Manuel Alvarado-Martínez, Dumitru Baleanu, Hasib Khan. Chaos in a Cancer Model via Fractional Derivatives with Exponential Decay and Mittag-Leffler Law. Entropy. 2017; 19 (12):681.
Chicago/Turabian StyleJosé Francisco Gómez-Aguilar; María Guadalupe López-López; Victor Manuel Alvarado-Martínez; Dumitru Baleanu; Hasib Khan. 2017. "Chaos in a Cancer Model via Fractional Derivatives with Exponential Decay and Mittag-Leffler Law." Entropy 19, no. 12: 681.
This paper addresses the challenge of evaluating control structures for a salt extractive distillation column producing absolute ethanol for use as biofuel. A sensitivity analysis aided with designing a pseudo-binary distillation pilot plant and examining the conceived process and the influence of the reflux ratio on both product purity and energy consumption. We compare three control structures for inferential tracking of the distillate composition: a dual-temperature control with an RV (reflux/boilup) structure and two single-end temperature control configurations, and their performance is measured using deterministic indicators. The result is the proposal of a pilot plant design for treating 15 kg/h of a diluted mixture with mole fraction of ethanol equal to 0.2 and assuming a column efficiency of 50%. The R/F (reflux to feed ratio) configuration is the best control structure, given that its corresponding performance indicators conduct lowest steady-state errors, less oscillating responses, and reduced settling times. For this configuration, the reflux flow rate is rationed to the feed flow rate, and the temperature is controlled manipulating the distillate flow rate. Even subject to perturbations, the energy consumption of the plant remains close to the nominal value. The three evaluated control structures consistently met international quality standards for fuel ethanol and enhanced the use of salts in ethanol dehydration.
Carlos Alberto Torres Cantero; Guadalupe Lopez Lopez; Victor M. Alvarado; Ricardo F. Escobar Jimenez; Jesse Y. Rumbo Morales; Eduardo M. Sanchez Coronado. Control Structures Evaluation for a Salt Extractive Distillation Pilot Plant: Application to Bio-Ethanol Dehydration. Energies 2017, 10, 1276 .
AMA StyleCarlos Alberto Torres Cantero, Guadalupe Lopez Lopez, Victor M. Alvarado, Ricardo F. Escobar Jimenez, Jesse Y. Rumbo Morales, Eduardo M. Sanchez Coronado. Control Structures Evaluation for a Salt Extractive Distillation Pilot Plant: Application to Bio-Ethanol Dehydration. Energies. 2017; 10 (9):1276.
Chicago/Turabian StyleCarlos Alberto Torres Cantero; Guadalupe Lopez Lopez; Victor M. Alvarado; Ricardo F. Escobar Jimenez; Jesse Y. Rumbo Morales; Eduardo M. Sanchez Coronado. 2017. "Control Structures Evaluation for a Salt Extractive Distillation Pilot Plant: Application to Bio-Ethanol Dehydration." Energies 10, no. 9: 1276.
Cinda Sandoval; Victor M. Alvarado; Jean-Claude Carmona; Guadalupe Lopez Lopez; J.F. Gomez-Aguilar. Energy management control strategy to improve the FC/SC dynamic behavior on hybrid electric vehicles: A frequency based distribution. Renewable Energy 2017, 105, 407 -418.
AMA StyleCinda Sandoval, Victor M. Alvarado, Jean-Claude Carmona, Guadalupe Lopez Lopez, J.F. Gomez-Aguilar. Energy management control strategy to improve the FC/SC dynamic behavior on hybrid electric vehicles: A frequency based distribution. Renewable Energy. 2017; 105 ():407-418.
Chicago/Turabian StyleCinda Sandoval; Victor M. Alvarado; Jean-Claude Carmona; Guadalupe Lopez Lopez; J.F. Gomez-Aguilar. 2017. "Energy management control strategy to improve the FC/SC dynamic behavior on hybrid electric vehicles: A frequency based distribution." Renewable Energy 105, no. : 407-418.
This paper deals with the design of a control scheme for improving the air supply subsystem of a Proton Exchange Membrane Fuel Cell (PEMFC) with maximum power of 65 kW. The control scheme is evaluated in a plant simulator which incorporates the balance of plant (BOP) components and is built in the aspenONE® platform. The aspenONE® libraries and tools allows introducing the compressor map and sizing the heat exchangers used to conduct the reactants temperature to the operating value. The PEMFC model and an adaptive controller were programmed to create customized libraries used in the simulator. The structure of the plant control is as follows: the stoichiometric oxygen excess ratio is regulated by manipulating the compressor power, the equilibrium of the anode-cathode pressures is achieved by tracking the anode pressure with hydrogen flow manipulation; the oxygen and hydrogen temperatures are regulated in the heat exchangers, and the gas humidity control is obtained with a simplified model of the humidifier. The control scheme performance is evaluated for load changes, perturbations and parametric variations, introducing a growing current profile covering a large span of power, and a current profile derived from a standard driving speed cycle. The impact of the control scheme is advantageous, since the control objectives are accomplished and the PEMFC tolerates reasonably membrane damage that can produce active surface reduction. The simulation analysis aids to identify the safe Voltage-Current region, where the compressor works with mechanical stability.
Alan Cruz Rojas; Guadalupe Lopez Lopez; J. F. Gomez-Aguilar; Victor M. Alvarado; Cinda Luz Sandoval Torres. Control of the Air Supply Subsystem in a PEMFC with Balance of Plant Simulation. Sustainability 2017, 9, 73 .
AMA StyleAlan Cruz Rojas, Guadalupe Lopez Lopez, J. F. Gomez-Aguilar, Victor M. Alvarado, Cinda Luz Sandoval Torres. Control of the Air Supply Subsystem in a PEMFC with Balance of Plant Simulation. Sustainability. 2017; 9 (1):73.
Chicago/Turabian StyleAlan Cruz Rojas; Guadalupe Lopez Lopez; J. F. Gomez-Aguilar; Victor M. Alvarado; Cinda Luz Sandoval Torres. 2017. "Control of the Air Supply Subsystem in a PEMFC with Balance of Plant Simulation." Sustainability 9, no. 1: 73.
The subspace identification methods (SIMs), such as past outputs multivariable output-error state space (PO-MOESP), numerical algorithms for subspace state-space system identification, and canonic correlation analysis, build state-space models from a set of input-output data of a linear time invariant system. In these algorithms, the key step is the computation of the extended observability matrix, which is done via an orthogonal projection between spaces generated by the input-output data. However, the PO-MOESP algorithm, unlike the others subspace methods, uses a different space for computing such projection. This fact hinders the analysis and direct comparison with other algorithms. In this paper, we introduce a modified version of the PO-MOESP algorithm, which is conceptually simpler, requires fewer steps for computing the model parameters, and enables the comparison with other SIMs. Three numerical examples are provided in order to show the effectiveness of the proposed approach.
Raul Nava Cabrera; Victor M. Alvarado; Guadalupe Lopez Lopez; Manuel Adam Medina; Victor Manuel Alvarado Martinez. An Alternative Approach to the Inference of the Extended Observability Matrix, and Its Relation With the PO-MOESP Algorithm. IEEE Transactions on Control Systems Technology 2016, 25, 888 -898.
AMA StyleRaul Nava Cabrera, Victor M. Alvarado, Guadalupe Lopez Lopez, Manuel Adam Medina, Victor Manuel Alvarado Martinez. An Alternative Approach to the Inference of the Extended Observability Matrix, and Its Relation With the PO-MOESP Algorithm. IEEE Transactions on Control Systems Technology. 2016; 25 (3):888-898.
Chicago/Turabian StyleRaul Nava Cabrera; Victor M. Alvarado; Guadalupe Lopez Lopez; Manuel Adam Medina; Victor Manuel Alvarado Martinez. 2016. "An Alternative Approach to the Inference of the Extended Observability Matrix, and Its Relation With the PO-MOESP Algorithm." IEEE Transactions on Control Systems Technology 25, no. 3: 888-898.
J.F. Gómez-Aguilar; M.G. López-López; Victor Manuel Alvarado Martinez; Juan Reyes-Reyes; Manuel Adam Medina. Modeling diffusive transport with a fractional derivative without singular kernel. Physica A: Statistical Mechanics and its Applications 2016, 447, 467 -481.
AMA StyleJ.F. Gómez-Aguilar, M.G. López-López, Victor Manuel Alvarado Martinez, Juan Reyes-Reyes, Manuel Adam Medina. Modeling diffusive transport with a fractional derivative without singular kernel. Physica A: Statistical Mechanics and its Applications. 2016; 447 ():467-481.
Chicago/Turabian StyleJ.F. Gómez-Aguilar; M.G. López-López; Victor Manuel Alvarado Martinez; Juan Reyes-Reyes; Manuel Adam Medina. 2016. "Modeling diffusive transport with a fractional derivative without singular kernel." Physica A: Statistical Mechanics and its Applications 447, no. : 467-481.
J.F. Gómez-Aguilar; Margarita Miranda Hernández; Ma. Guadalupe López López; Victor Manuel Alvarado Martinez; D. Baleanu. Modeling and simulation of the fractional space-time diffusion equation. Communications in Nonlinear Science and Numerical Simulation 2016, 30, 115 -127.
AMA StyleJ.F. Gómez-Aguilar, Margarita Miranda Hernández, Ma. Guadalupe López López, Victor Manuel Alvarado Martinez, D. Baleanu. Modeling and simulation of the fractional space-time diffusion equation. Communications in Nonlinear Science and Numerical Simulation. 2016; 30 (1-3):115-127.
Chicago/Turabian StyleJ.F. Gómez-Aguilar; Margarita Miranda Hernández; Ma. Guadalupe López López; Victor Manuel Alvarado Martinez; D. Baleanu. 2016. "Modeling and simulation of the fractional space-time diffusion equation." Communications in Nonlinear Science and Numerical Simulation 30, no. 1-3: 115-127.
Highlights•Actuator fault tolerant control.•Flow rates virtual sensors.•Model Following Control for a Heat exchanger. AbstractThis work presents an actuator fault tolerant control (FTC) system applied in a counter-current double pipe heat exchanger. The heat exchanger has two input variables which are, cold and hot water flow rates. The main actuator manipulates the cold water flow rate in order to control the hot water temperature. The goal of this work is to keep in continuous operation the counter-current double pipe heat exchanger, even if the main actuator is stuck-open. In case of failure on the main actuator, it is proposed to control the process with the second input variable (by manipulating the hot water flow rate). To achieve our aim, we designed an FTC system based in a fault detection and isolation (FDI) system and a Model Following Control (MFC). To develop the FDI system an adaptive nonlinear observer to estimate the flow rates in the heat exchanger for both streams (hot and cold) was implemented. The FDI is performed by the comparison between the flow rate estimation (by the adaptive nonlinear observer) and the flow rate provided by the control law. The nonlinear flow rate estimation is needed because the real plant does not have digital flowmeters to measure the flow rates online. The FDI system allows to detect and isolate the fault actuator then, the control signal and the failure accommodation is realized by the MFC. The results showed that it is possible to keep the heat exchanger in continuous operation even if the main actuator is stuck-open.
D.A. Carbot-Rojas; R.F. Escobar; J.F. Gómez-Aguilar; G. López-López; Victor Hugo Olivares-Peregrino. Experimental validation of an actuator fault tolerant control system using virtual sensor: Application in a double pipe heat exchanger. Chemical Engineering Research and Design 2015, 104, 400 -408.
AMA StyleD.A. Carbot-Rojas, R.F. Escobar, J.F. Gómez-Aguilar, G. López-López, Victor Hugo Olivares-Peregrino. Experimental validation of an actuator fault tolerant control system using virtual sensor: Application in a double pipe heat exchanger. Chemical Engineering Research and Design. 2015; 104 ():400-408.
Chicago/Turabian StyleD.A. Carbot-Rojas; R.F. Escobar; J.F. Gómez-Aguilar; G. López-López; Victor Hugo Olivares-Peregrino. 2015. "Experimental validation of an actuator fault tolerant control system using virtual sensor: Application in a double pipe heat exchanger." Chemical Engineering Research and Design 104, no. : 400-408.
Fractional calculus is the branch of mathematical analysis that deals with operators interpreted as derivatives and integrals of non-integer order. This mathematical representation is used in the description of non-local behaviors and anomalous complex processes. Fourier’s lawfor the conduction of heat exhibit anomalous behaviors when the order of the derivative is considered as 0 < β,ϒ ≤ 1 for the space-time domain respectively. In this paper we proposed an alternative representation of the fractional Fourier’s law equation, three cases are presented; with fractional spatial derivative, fractional temporal derivative and fractional space-time derivative (both derivatives in simultaneous form). In this analysis we introduce fractional dimensional parameters σ
Francisco Gómez; Luis Morales; Mario González; Víctor Alvarado; Ma. Guadalupe López López. Fractional thermal diffusion and the heat equation. Open Physics 2015, 13, 1 .
AMA StyleFrancisco Gómez, Luis Morales, Mario González, Víctor Alvarado, Ma. Guadalupe López López. Fractional thermal diffusion and the heat equation. Open Physics. 2015; 13 (1):1.
Chicago/Turabian StyleFrancisco Gómez; Luis Morales; Mario González; Víctor Alvarado; Ma. Guadalupe López López. 2015. "Fractional thermal diffusion and the heat equation." Open Physics 13, no. 1: 1.
Humans being subject to traumatic accidents which cause they cannot carry out activities of daily living. When a muscle is not used or gets weak, it tends to shorten, the joints become stiff, causing deformities or contractures and without a physical therapy lose their aptitudes. Ankle rehabilitation systems have been proposed to achieve the full range of motion and stretching smoothly the muscles and tendons. In this paper we propose a virtual prototype of an ankle rehabilitation machine which provides the whole range of ankle related foot movements. The controllers are designed with trajectory tracking task to provide smooth movements of rehabilitation in a single motion or the combination of two movements. Some simulation results using the mathematical model are presented and compared with the obtained from the virtual prototype simulated under the ADAMS environment.
A. Blanco Ortega; E. Quintero M'rmol; G. Vela Valdes; G. Lopez Lopez; H.R. Azcaray Rivera. Control of a Virtual Prototype for Ankle Rehabilitation. 2012 Eighth International Conference on Intelligent Environments 2012, 80 -86.
AMA StyleA. Blanco Ortega, E. Quintero M'rmol, G. Vela Valdes, G. Lopez Lopez, H.R. Azcaray Rivera. Control of a Virtual Prototype for Ankle Rehabilitation. 2012 Eighth International Conference on Intelligent Environments. 2012; ():80-86.
Chicago/Turabian StyleA. Blanco Ortega; E. Quintero M'rmol; G. Vela Valdes; G. Lopez Lopez; H.R. Azcaray Rivera. 2012. "Control of a Virtual Prototype for Ankle Rehabilitation." 2012 Eighth International Conference on Intelligent Environments , no. : 80-86.
The capabilities and suitability of the Aspen Plus® modular simulator to treat the problem of complex chemical processes control is investigated. A case study is illustrated for the simulation and control of an azeotropic heterogeneous distillation process to produce anhydrous ethanol. The study is structured in three stages. Firstly, a flow diagram of the major equipment items of the process is constructed in Aspen Plus™ to support the steady state simulation and to generate a sensitivity analysis. In a second stage, a literature based control scheme is reproduced using the Aspen Dynamics™ software, as a basis for dynamic simulation. Finally, an intelligent control is designed to replace two PI controllers form the literature scheme. A normalized Mamdani-type fuzzy control system was developed within the Custom Modeler™ environment to build up a modified control arrangement, attaining from 99.55 to 99.62% purity of ethanol.
Rosendo Vargas Valle; Ma. Guadalupe Lopez Lopez; Enrique Quintero-Marquez. Control of an azeotropic distillation process for anhydrous ethanol production. CONIELECOMP 2011, 21st International Conference on Electrical Communications and Computers 2011, 88 -93.
AMA StyleRosendo Vargas Valle, Ma. Guadalupe Lopez Lopez, Enrique Quintero-Marquez. Control of an azeotropic distillation process for anhydrous ethanol production. CONIELECOMP 2011, 21st International Conference on Electrical Communications and Computers. 2011; ():88-93.
Chicago/Turabian StyleRosendo Vargas Valle; Ma. Guadalupe Lopez Lopez; Enrique Quintero-Marquez. 2011. "Control of an azeotropic distillation process for anhydrous ethanol production." CONIELECOMP 2011, 21st International Conference on Electrical Communications and Computers , no. : 88-93.
Heat regenerators transfer heat from one gas to another, with an intermediate storage in solids. The heat transfer surface for gas flow application should provide at the same time high surface area and low friction factor. Three geometries of heat transfer surface, monolith, stack of woven screens and bed of spheres, have been compared. Their performance was evaluated from the pressure drop of the heat regenerator working at a given heat transfer efficiency. The comparison was performed using numerical simulation and published measurements of heat transfer and flow friction characteristics. By adjusting the length and the period of the exchanger, it is possible to obtain the same heat transfer efficiency with the three geometries. Beds of spheres give very short and compact heat regenerators, working at high pressure drop. At the opposite, monoliths form long regenerators working at low pressure drop. Stacks of woven screens cover a wide range of performance: low porosity woven screens give high heat transfer efficiency and high pressure drop, while high porosity woven screens offer performance similar to that of the monoliths. Copyright © 2001 John Wiley & Sons, Ltd.
Guadalupe Lopez Lopez. Comparison of performance of heat regenerators: Relation between heat transfer efficiency and pressure drop. International Journal of Energy Research 2001, 25, 319 -329.
AMA StyleGuadalupe Lopez Lopez. Comparison of performance of heat regenerators: Relation between heat transfer efficiency and pressure drop. International Journal of Energy Research. 2001; 25 (4):319-329.
Chicago/Turabian StyleGuadalupe Lopez Lopez. 2001. "Comparison of performance of heat regenerators: Relation between heat transfer efficiency and pressure drop." International Journal of Energy Research 25, no. 4: 319-329.