Ingeniería Mecánica

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    Diseño de un punzón para corte-troquelado de un material compuesto de matriz polimérica reforzado con fibras naturales
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-06) Acosta Castro, Lucas David; Pérez Salinas, Cristian Fabian
    In the present project, a punch was designed and built with the purpose of being used in composite materials, in such a way that it was analyzed whether the type of punch configuration, the type of reinforcement fiber and the type of matrix influence the quality of the cut. Four different configurations were used for the study: straight, Wshaped, double shear at 20 degrees and single shear at 30 degrees; which were designed in a CAD with a diameter of 12.7 mm and a height of 70 mm. The study focuses on the simulation through the application of the finite element method in a specialized software where the dynamic behavior of the various types of punch was evaluated and through which six types of composite materials were designed and used for each simulation. In order to validate the simulations carried out, we chose to build the punches with their various secondary components to be evaluated and tested in two composite materials: One made of epoxy resin with jute fiber and the second of polyester resin with jute fiber. Once the punching test was performed, the cuts were evaluated, resulting in a delamination factor at the entrance of 1.046 and at the exit of 1.066; in this way it was analyzed that the W punch is the ideal cutting tool for the application in composite materials.
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    Transformación de una válvula termostática en una válvula regulada electrónicamente mediante el control de la temperatura del elemento termostático. aplicación al estudio del comportamiento estático y dinámico de un ciclo simple de refrigeración
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2019) Quinatoa Quinatoa, Keny Javier; García del Valle, Javier
    The research work focused on the transformation of a conventional thermostatic expansion valve (TXV), into an electronically regulated valve by controlling the temperature in the bulb and the design of a thermostatic expansion valve prototype, in order to provide with an expansion device that could be able to match the performance of a commercial expansion valve. Their behavior was studied through a static and dynamic study in a simple refrigeration system. For which, an analysis was made by means of comparison of experimental data against a mathematical model of the refrigeration bench. The mathematical model was programmed to predict the behavior of the cooling system and thus determine the optimal operating conditions. The idea is to maintain the degree of superheating at the outlet of the evaporator regardless of the operating conditions of the cooling system. This is obtained by resistances that surround the bulb of the thermostatic expansion valve. The data computed by the mathematical model was validated with the experimental data measured in the refrigeration bench. Once the results have been analyzed and compared, it is determined that it is possible to control degree of superhating at the evaporator outlet accurately.