Technical University Zacatecas

Fresnillo de González Echeverría, Mexico

Technical University Zacatecas

Fresnillo de González Echeverría, Mexico
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Guzman-Valdivia C.H.,Technical University Zacatecas | Carrera-Escobedo J.L.,Technical University Zacatecas | Garcia-Ruiz M.A.,Technical University Zacatecas | Ortiz-Rivera A.,Technical University Zacatecas
Mechatronics | Year: 2016

Agricultural products such as chilies generally require drying for preservation. Traditionally, the chili drying process has been accomplished by burning fossil fuels in ovens or by open air drying. However, this process leads to severe losses in the quality and quantity of the final product. In this paper, a portable laboratory has been designed, developed and controlled using a mechatronic design philosophy in order to facilitate the chili drying process study. This portable laboratory can simulate different drying conditions under a controlled environment in order to find the best drying parameters for different kinds of chilies. Their computer based intelligence can monitor and control temperature, humidity, air flow, electric current and weight through a graphical user interface (GUI). The modeling and control technique of the system is described in detail. Simulation results using the mathematical model and experimental results under different drying conditions are presented to demonstrate the high performance of the portable laboratory and its great potential. © 2016 Elsevier Ltd.

Valdivia C.H.G.,Technical University Zacatecas | Ortega A.B.,CENIDET | Salazar M.A.O.,CENIDET | Escobedo J.L.C.,Technical University Zacatecas | Villeda M.A.L.,Polytechnic University of Sinaloa
2013 10th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2013 | Year: 2013

A hip fracture causes musculoskeletal problems which affect the patient to carry out activities of daily living (ADLs) such as standing and walking. Rehabilitation therapies are procedures to restore the movement of a joint or a muscle due to illness or injury. The goal of rehabilitation therapeutic exercises is to perform specific movements that cause muscle activation to the patient, in order to recover and minimize the damage after a prolonged immobilization. In this paper, a hip rehabilitation robot using a virtual prototype is presented which provides flexion/extension movements with a Generalized Proportional Integral (GPI) controller that performs soft movements. A GPI controller is proposed for the efficient rejection of an unknown perturbation input due the weight of the leg and unexpected reflexes of the muscles during the therapy. Simulation results using a GPI controller in a robust perturbation rejection scheme for a trajectory tracking task are presented. In order to assess the performance and outstanding disturbance rejection capabilities of the proposed robust GPI controller, a comparison with a PD and PID controller is also presented. © 2013 IEEE.

Carrillo-Reyes J.,San Luis Potosí Institute of Scientific Research and Technology | Carrillo-Reyes J.,National Autonomous University of Mexico | Cortes-Carmona M.A.,San Luis Potosí Institute of Scientific Research and Technology | Cortes-Carmona M.A.,Technical University Zacatecas | And 2 more authors.
Renewable Energy | Year: 2016

Most of the fermentative hydrogen production studies based on mixed cultures have shown enrichment of the microbial community by means of a heat treatment. This heat treatment enrichment strategy selects for Clostridum spp., an efficient hydrogen producer; however, other bacteria that may contribute to the systems performance could be excluded. Another enrichment strategy based on high dilution rates selects different taxonomic groups, which may affect hydrogen production and the system stability. In this work, two enrichment strategies were evaluated, heat shock and cell wash-out, for hydrogen production and the system stability in continuous stirred reactors. The enriched communities were then inoculated in packed bed reactors and operated up to 70 days. Both strategies selected hydrogen producing bacteria, mainly Clostridium spp. The highest hydrogen production rate (6.01 L H2/L-d), molar yield (1.29 mol H2/mol glucoseconsumed), and stability were achieved by the wash-out procedure; this high performance was attributed to facultative bacteria like Lactobacillus and Lactococcus. Furthermore, there was a transition within the community (along the operation time in the reactor with cell wash-out inoculum) and a selection for methanogenic activity (due to the long solids retention time). © 2016 Elsevier Ltd.

Cruz O.,CIATEC | Santos R.,Technical University Zacatecas
IIE Annual Conference and Expo 2013 | Year: 2013

This article presents a choice to improve the process of assigning storage allocations in a warehouse. The main inconvenient frequently in these situations are, that existing techniques like model assignment or plant layout representations require the compliance of some assumptions that commonly do not appear in reality. Sometimes it is necessary to deal with complex and diverse variables that make the use of traditional tools difficult. Therefore, considering the complexity of the problem, this document is presented as an alternative to improve the mentioned process. The document is based on simulation using FLEXSIM® and artificial neural networks, considering the problem linearly separable.

Rivera H.R.A.,National Research Center y Desarrollo Tecnologico | Ortega A.B.,National Research Center y Desarrollo Tecnologico | Bautista R.V.,University of Veracruz | Mendoza L.M.,University of Veracruz | Valdivia C.G.,Technical University Zacatecas
Proceedings - 2013 International Conference on Mechatronics, Electronics and Automotive Engineering, ICMEAE 2013 | Year: 2013

Rehabilitation is very important because it is the means by which functions are recovered injured joints or limbs, and if rehabilitation therapy begins immediately after the injury or some corrective surgery the chances of recovery increase significantly, this rehabilitation achieved with continuous passive motion (CPM). This article presents the design of an ankle rehabilitation CPM, are virtual design, prototyping and control to physical rehabilitation, also presents a preliminary study of myoelectric signals (EMG) showing the importance of rehabilitation CPM. © 2013 IEEE.

Guzman-Valdivia C.H.,Technical University Zacatecas | Blanco-Ortega A.,CENIDET | Oliver-Salazar M.A.,CENIDET | Gomez-Becerra F.A.,CENIDET | Carrera-Escobedo J.L.,Technical University Zacatecas
Mechatronics | Year: 2015

The hip is the strongest joint of the human body. A wide range of disorders and fractures can affect the hip. The use of therapeutic robots has the potential to reduce the physical workload of rehabilitation and to improve repeatability. In this paper, a simple hip-joint rehabilitation robot (HipBot) is presented to perform combined movements of abduction/adduction and flexion/extension. HipBot has 5-DOF and can perform combined movements. This system can learn specific exercise motions through a GUI and perform them without the physiotherapist. In addition, HipBot is capable of performing rehabilitation on both right and left legs (individually). The simple mechanism covers the requirements of stability and robustness necessary for hip-joint rehabilitation. The mechatronic design and control technique are described. The robot system was tested in a small group of healthy subjects. The experimental results carried out on healthy subjects proved the high performance of the rehabilitation device and showed its great potential. © 2015 Elsevier Ltd.

Guzman Valdivia C.H.,Technical University Zacatecas | Blanco Ortega A.,National Research Center y Desarrollo Tecnologico | Oliver Salazar M.A.,National Research Center y Desarrollo Tecnologico | Carrera Escobedo J.L.,Technical University Zacatecas
Proceedings - 2013 International Conference on Mechatronics, Electronics and Automotive Engineering, ICMEAE 2013 | Year: 2013

Stroke is the leading cause of disability in the elderly population. Rehabilitation in a general sense aims to return a person to their activities of daily living. Therapeutic exercises are important for the maintenance of joints. When a joint is immobilized for long periods of time is likely to suffer severe damage. In this paper, a new robotic mechanism that allows circular movements to the lower limbs rehabilitation is proposed. The system consists of 5 DoF to perform combined movements to the lower limbs. The kinematics of the leg and the robotic mechanism are shown in detail. The simulations were performed using MATLAB. The leg trajectories are circular in 2D and 3D. In conclusion, this new robotic mechanism performs new circular exercises to the leg, which are difficult to perform manually by the therapist. © 2013 IEEE.

Carrera J.L.E.,Technical University Zacatecas | Riesco J.M.A.,University of Guanajuato | Martinez S.M.,Autonomous University of Nuevo León | Sanchez F.A.C.,Autonomous University of Nuevo León | Gallegos A.M.,University of Guanajuato
Thermal Science | Year: 2013

The fuel called biogas is obtained through anaerobic digestion of different types of organic waste, providing a way to tap the energy stored in organic matter. The use of this fuel is also attractive from the standpoint of global warming because its application does not register a net emission of carbon dioxide into the atmosphere. One possible use for this fuel is to feed the spark-ignition internal combustion engines. In the present, there is little information available about the process of combustion in internal combustion engines fueled by biogas. The combustion process of an internal combustion engine ignition powered by biogas is characterized in terms of the duration of combustion, i. e., depending on the time elapsed while the reac-tants (methane and oxygen) are transformed into products (mainly carbon dioxide and water). This study numerically evaluates the way in which the geometrical parameters such as the compression ratio and operating parameters like engine speed, the excess air, the time of spark timing and carbon dioxide content of biogas affect the evolution of the combustion process. To carry out this study, a five factors and two levels experiment was designed and conducted, based on which, the most influential parameters were identified. Equations expressing the combustion characteristic parameters, as a function of the geometric and operation parameters of a spark ignited engines, are delivered as a result.

Valdivia C.H.G.,Technical University Zacatecas | Ortega A.B.,National Research Center y Desarrollo Tecnologico | M'Rquez E.Q.M.,National Research Center y Desarrollo Tecnologico | Salazar M.A.O.,National Research Center y Desarrollo Tecnologico
Proceedings - 8th International Conference on Intelligent Environments, IE 2012 | Year: 2012

In this research project we present the design and construction of a biped robot based on dynamic walking. The main objective of this research is the assimilation of technology in the field of dynamic walking robots, therefore, we built a prototype based on a previously built robot developed at Delft University created by Martjin Wisse. The reason for performing this research is to have a starting point in the development of bipedal robots and human prostheses. The robot was built under a mechatronic approach, i.e. with a synergical relationship between the mechanical, electronics and programming constituent parts. The prototype performes dynamic walking analogous to the locomotion of humans. It was concluded that these technologies can be used for the design, simulation and construction of dynamic walking robots. © 2012 IEEE.

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