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Pachuca de Soto, Mexico

Gomez-Mancilla J.C.,National Polytechnic Institute of Mexico | Palacios-Pineda L.M.,Pachuca Institute of Technology | Lopez-Grijalba Y.,Pachuca Institute of Technology
World Academy of Science, Engineering and Technology | Year: 2011

A new mechanism responsible for structural life consumption due to resonant fatigue in turbine blades, or vanes, is presented and explained. A rotating blade or vane in a gas turbine can change its contour due to erosion and/or material build up, in any of these instances, the surface pressure distribution occurring on the suction and pressure sides of blades-vanes can suffer substantial modification of their pressure and temperatures envelopes and flow characteristics. Meanwhile, the relative rotation between the blade and duct vane while the pressurized gas flows and the consequent wake crossings, will induce a fluctuating thrust force or lift that will excite the blade. An actual totally used up set of vane-blade components in a HP turbine power stage in a gas turbine is analyzed. The blade suffered some material erosion mostly at the trailing edge provoking a peculiar surface pressure envelope which evolved as the relative position between the vane and the blade passed in front of each other. Interestingly preliminary modal analysis for this eroded blade indicates several natural frequencies within the aeromechanic power spectrum, moreover, the highest frequency component is 94% of one natural frequency indicating near resonant condition. Independently of other simultaneously occurring fatigue cycles (such as thermal, centrifugal stresses). Source

Ablanedo-Rosas J.H.,University of Texas at El Paso | Alidaee B.,University of Mississippi | Moreno J.C.,Procter and Gamble | Urbina J.,Pachuca Institute of Technology
International Journal of Production Research | Year: 2010

Global markets are continuously changing and demanding customised, low cost, and high quality products and services; organisations that offer these products and services are dealing with these issues on a daily basis to stay competitive. Among the quality tools used to achieve competitive advantage, the 5S practice plays an important role facilitating the introduction and development of other quality and continuous improvement methods and techniques. We present results of an empirical study applied to some Mexican organisations with the aim of understanding their implementation experience, empirical relationships, and ongoing challenges associated with the 5S practice. © 2010 Taylor & Francis. Source

Cruz-Tolentino J.A.,Autonomous University of the State of Hidalgo | Ramos-Velasco L.E.,Autonomous University of the State of Hidalgo | Espejel-Rivera M.A.,Pachuca Institute of Technology
CONIELECOMP 2010 - 20th International Conference on Electronics Communications and Computers | Year: 2010

In this paper a self-tuning wavelet PID controller using wavelet networks is presented. The wavelet-based multiresolution PID controller was purpose by [8], the ability of this controller is to provide good rejection to disturbances and smooth control signal. One of its disadvantages is that the tuning gains are in trial or error mode. A wavelet network to identify the system and to tune the gains of the wavelet PID controller is proposed. To validate the proposed control system numerical simulation is performed for a motion control system. ©2010 IEEE. Source

Gonzalez-Marron D.,Pachuca Institute of Technology | Gonzalez-Marron D.,Monterrey Institute of Technology | Gonzalez-Mendoza M.,Monterrey Institute of Technology | Hernandez-Gress N.,Monterrey Institute of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Recently, many researchers are trying to automate the automatic production of ontologies, realizing extraction of the information contained in databases using reverse engineering, however, because of the continuous evolution of standards in relational databases, not all the characteristics presented by modern databases managers are still supported. Besides as databases can be implemented in several ways in relational databases using different commands, this frequently causes differences when creating ontologies. In this paper, is presented how this approach can be applied to an epidemiological database and the advantages of use, when realizing query exploitation. © 2013 Springer-Verlag. Source

Lopez-Villarreal F.,Celaya Institute of Technology | Lopez-Villarreal F.,Pachuca Institute of Technology | Lira-Barragan L.F.,Universidad Michoacana de San Nicolas de Hidalgo | Rico-Ramirez V.,Celaya Institute of Technology | And 2 more authors.
Computers and Chemical Engineering | Year: 2014

This paper proposes a mathematical programming model for the pollution trading among different pollution sources which considers the sustainability of the surrounding watershed. The formulation involves the minimization of the costs associated to the implementation of the required technology to satisfy the environmental constraints in order to achieve optimal water quality conditions. The model uses a material flow analysis technique to represent changes on the behavior of the watershed due to the polluted discharges. The material flow analysis considers all discharges and extractions (i.e., industrial and residential discharges, pluvial precipitation, evaporation, etc.) as well as the chemical and biochemical reactions taking place in the watershed. In the context of pollution trading, the implementation of the proposed formulation determines if an industrial source must buy credits to compensate the violation of environmental constraints, or if it requires the installation of treatment technologies to sell credits to another source. The formulation was applied to a case study involving the drainage system of the Bahr El-Baqar region in Egypt; the results show the advantages of the proposed approach in terms of cost and sustainability. © 2014 Elsevier Ltd. Source

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