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- 저자 : Contreras-Lopez (검색결과 5 건)
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Nonlinear optimal control for reducing vibrations in civil structures using smart devices
Joaquin Contreras-Lopez,Fernando Ornelas-Tellez,Elisa Espinosa-Juarez 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.3
The frequently excessive vibrations presented in civil structures during seismic events or service conditions may result in users’ discomfort, or worst, in structures failure, producing economic and even human casualties. This work contributes in proposing the synthesis of a nonlinear optimal control strategy for semiactive structural control, with the main characteristic that the synthesis considers both the structure model and the semiactive actuator nonlinear dynamics, which produces a nonlinear system that requires a nonlinear controller design. The aim is to reduce the unwanted vibrations in the response of civil structures, by means of intelligent fluid semiactive actuator such as the Magnetorheological Damper (MRD), which is a device with a low level of power consumption. The civil structures for which the proposed control methodology can be applied are those admitting a state-dependent coefficient factorized representation model, such as buildings, bridges, among others. A scaled model of a three storey building is analyzed as a case study, whose dynamical response involves displacement, velocity and acceleration of each one of the storeys, subjected to the North-South component of the September 19th., 2017, Puebla-Morelos (7.1M), Mexico earthquake. The investigation rests on comparing the structural response over time for two different conditions: with no control device installed and with one MRD installed between the first floor and the ground, where a nonlinear optimal signal for the MRD input voltage is determined. Simulation results are presented to show the effectiveness of the proposed controller for reducing the building's dynamical response.
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Jose A. Morales-Contreras,Jessica E. Rodrıguez-Perez,Carlos A. A lvarez-Gonzalez,Mirian C. Martınez-Lopez,Isela E. Juarez-Rojop,Angela A vila-Fernandez 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.10
Bifidobacterial proteins have been widely studiedto elucidate the metabolic mechanisms of diet adaptationand survival of Bifidobacteria, among others. The use ofheterologous expression systems to obtain proteins in sufficientquantities to be characterized has been essential inthese studies. L. lactis and the same Bifidobacterium asexpression systems highlight ways to corroborate some ofthe functions attributed to these proteins. The most studiedproteins are enzymes related to carbohydrate metabolism,particularly glycosidases, due to their potential applicationin the synthesis of neoglycoconjugates, prebioticneooligosaccharides, and active metabolites as well as theirhigh specificity and efficiency in processing glycoconjugates. In this review, we classified the recombinant bifidobacterialproteins reported to date whose characterizationhas demonstrated their usefulness or their ability to producea product of commercial interest for the food industry,biomedicine, process innovation and glycobiology. Futuredirections for their study are also discussed.
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Surgical Management of a Type II Extracranial Internal Carotid Aneurysm near to the Skull Base
Miguel A. Mendez-Sosa,Emmanuel Contreras-Jimenez,Javier E. Anaya-Ayala,Montserrat W. Miranda-Ramirez,Gabriel Lopez-Pena,Luis H. Arzola,Santiago Mier y Teran-Ellis,Hugo Laparra-Escareno,Carlos A. Hinoj 대한혈관외과학회 2021 Vascular Specialist International Vol.37 No.3
True aneurysmal disease in the carotid arteries is very uncommon, but individuals with this pathology face the grave risk of thromboembolism, which may consequently lead to cerebrovascular accidents. Clinical knowledge remains relatively limited owing to its rarity. We present the case of a 41-year-old obese female with a type II right extracranial internal carotid artery aneurysm incidentally found during imaging work-up. She underwent open surgical reconstruction with an autologous interposition graft from the common carotid artery to the internal carotid artery at the base level of the skull. Her postoperative period was uneventful, and the patient was discharged on postoperative day five with aspirin. At 12 months of follow-up, the patient remained symptom-free without complications.
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Linares-Flores, Jesus,Sira-Ramirez, Hebertt,Cuevas-Lopez, Edel F.,Contreras-Ordaz, Marco A. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
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Jesus Linares-Flores,Hebertt Sira-Ramirez,Edel F. Cuevas-Lopez,Marco A. Contreras-Ordaz 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
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