http://repositorio.ugto.mx/handle/20.500.12059/4212 2026-04-20T16:24:48Z 2026-04-20T16:24:48Z JORGE ELIECER BENITEZ PRADA http://repositorio.ugto.mx/handle/20.500.12059/13588 2025-05-14T15:39:13Z 2024-08-01T00:00:00Z

Title: IMPLEMENTACIÓN Y ANÁLISIS DEL AUTOENSAMBLAJE DE CLAVIJA EN AGUJERO UTILIZANDO DISEÑO DE EXPERIMENTOS Authors: JORGE ELIECER BENITEZ PRADA Contributor: HECTOR PLASCENCIA MORA Abstract: El ensamblaje de componentes manufacturados en productos finales requiere tradicionalmente de intervención humana y de elevados recursos. Sin embargo, los procesos de autoensamblaje, que utilizan interacciones físicas espontáneas para formar estructuras complejas, prometen ensamblajes más eficientes y sostenibles. Esta investigación explora la viabilidad del autoensamblaje macroscópico, específicamente en la inserción autónoma de una clavija en agujero. La hipótesis plantea la posibilidad de identificar y controlar los elementos que constituyen el autoensamblaje, como el diseño del componente, el entorno del proceso, las fuerzas involucradas y la reversibilidad del ensamblaje, para lograr la inserción autónoma de una clavija en agujero. A través de un minucioso estudio teórico, se explora el proceso tradicional de ensamblaje de clavija en orificio, que incluye el diseño, el concepto de triángulo de fricción, los modos de falla y un modelo de inserción bidimensional. Estos aspectos teóricos proporcionan una base sólida para comprender las características que debe cumplir el autoensamblaje. Un estudio detallado del autoensamblaje cubre su concepto, funcionamiento y aplicaciones. Se analizan ejemplos históricos de implementaciones de autoensamblaje macroscópico y algunos de estos sistemas se replican mediante ingeniería inversa. Los conocimientos teóricos y prácticos en esta etapa permiten comprender de manera integral la metodología para generar un proceso autónomo de inserción de clavijas en agujero. Además, la observación y experimentación previa utilizando un prototipo básico de autoensamblaje a escala macroscópica en tres dimensiones complementa todo el conocimiento para diseñar y fabricar un banco de pruebas experimental que permita el análisis de factores controlados proponiendo un diseño experimental. La construcción del sistema de pruebas experimentales valida la hipótesis planteada; el sistema permite la inserción de clavijas de diferentes alturas en el agujero sincronizando los elementos que constituyen un autoensamblaje. Posteriormente, se determinan los factores controlables con influencia significativa en la respuesta de inserción y se ajusta un modelo.

2024-08-01T00:00:00Z CARLOS ALBERTO RUBIO JIMENEZ http://repositorio.ugto.mx/handle/20.500.12059/8027 2023-03-30T16:54:50Z 2012-08-01T00:00:00Z

Title: Evaluation of microchannel networks for efficient cooling of IC chips using Single-Phase cooling Authors: CARLOS ALBERTO RUBIO JIMENEZ Contributor: Satish Kandlikar Abstract: This era is called information age. Computational equipment make possible to generate, transfer and process data each second worldwide. IC chips are the bases of these electronic devices. Thus, there is a deep interest in these high-tech electronic technologies. Since the development of the transistor in the Bell Laboratories, the IC chips have grown strongly, mainly in the slenderness and its number of transistors. For example, the Intel? Core” ¡7 is currently a part of the newest computational processor generation manufactured by Intel” Corporations. lts architecture is formed by 774 million of 64 nm-transistor (compared on its predecessor, this device has an increase of fourteen times the number of these vital components.) By 2016, it is projected that the next computation processor generation will have 10-30 nm architecture with an increase of 1.3 times in the number of transistors. Although the panorama looks pretty good, there is an important drawback of this tendency. The transfer of electrons into the IC chip generates an important amount of thermal energy, which is affected directly by the increase of the number of transistors, and inversely by the decrease of the computational processor size. Thus, several researchers have been focused to enhance current cooling IC chip technology as well as generate novel cooling systems. Since the beginning of this century, liquid cooling technologies have received a deep attention for the next cooling electronic device generation. Large part of the researchers developed in this area has been addressed to study microchannel heat sinks, The large heat transfer coefficient that the cooling fluid can achieve when is flowing through these tiny devices as well as the heat sink slenderness, make them a true alternative for dissipating the high heat fluxes to be generated in the next computational processors generation. Good knowledge of the phenomena and generation of novel configurations have been the main result of these studies. However, a couple of problem remains present: non-uniform junction temperature and high fluid pressure drop. Studies focused to analyze the thermo-mechanical effects generated on the IC chip have shown that the hotspots produce several damages into the chip. Thus, it is highly desirable to generate homogeneous temperature in the cooling system. Moreover, the system energy requirements increase directly with the pressure drop. Thus, reduction of this energy losses is desirable in order to do more reliable the cooling system (appropriate pumping power). This work is a contribution in the microchannel heat sink area aimed to obtain a micro cooling system capable to generate uniform junction temperature with the lowest pressure drop penalty. Analytical and numerical studies are carried out in order to achieve this goal / Carlos Alberto Rubio-Jimenez ; directores: Satish G. Kandlikar, Abel Hernandez-Guerrero.

2012-08-01T00:00:00Z RENNY JESUS GUILLEN RUJANO http://repositorio.ugto.mx/handle/20.500.12059/4621 2021-04-21T17:28:37Z 2020-05-01T00:00:00Z

Title: Analytical and Numerical Study of The Plate Twist Test in Composite Laminates and Sandwich Panels Authors: RENNY JESUS GUILLEN RUJANO Contributor: ADRIAN HERNANDEZ PEREZ Abstract: An analytical and numerical research work related to the plate twist test of specially orthotropic plates is developed in this thesis. Two finite element models and two analytical closed-form solutions are developed for deflections and rotations of thick specially orthotropic materials under twisting loads by using the first-order shear deformation theory. These solutions show good agreement in the compliance predictions with respect to previously reported measurements and finite element estimations. The first solution considers the effect solely of the stiffness D66 and A44, A55 in the compliance, assuming shear correction factors of 2/3 and a twisting moment Mxy = P/4 The second solution not only considers the influence of D66 and A44, A55 on the compliance but alsothat by D11, D12, D22 stiffnesses, varying the shear correction factors and Mxy according to the material system and geometry. The results of the parametrical analys is show that both solutions are able to adequately predict the deflections of specially orthotropic plates from low to moderately high side-length to thickness ratios (1 ≤ side-lengths/thickness ≤ 20and(1 ≤ side-lengths/thickness ≤ 61), respectively; also both solutions can be used for rectangular plates with ratios between sides-length (1 ≤side-length in X axis/side-length in Y axis ≤ 10).Examination of the in-plane shear modulus ratio between face sheets and core (G12f / G12c) points out that the first solutions lightly underpredicts the compliance with respect to finite element method (FEM), specially for G12f / G12c ratios larger than 100,whilstthe second solution match very well for those ratios. Examination of the Mxy by finite element method showed that Mxy has a parabolic behavior for sandwich panels with compliant cores, reaching a maximum value at the center of the plate different to P/4 and being dependent of the material properties.

2020-05-01T00:00:00Z JUAN PEDRO PEREZ TRUJILLO http://repositorio.ugto.mx/handle/20.500.12059/4620 2021-04-21T17:18:50Z 2019-09-01T00:00:00Z

Title: Experimental and Numerical Study of Molten Carbonate Fuel Cells Working in Reversible Mode Authors: JUAN PEDRO PEREZ TRUJILLO Contributor: FRANCISCO ELIZALDE BLANCAS Abstract: Molten Carbonate Fuel Cells (MCFCs) have a great potential to help facing the global warming problem. MCFCs have the characteristics that can be used as a fuel cell to produce electricity, can be used as a carbon capture and sequestration device helping to manage the carbon dioxide emissions, as well as an electrolyzer to produce hydrogen or synthesis gas using carbon dioxide and water as fuels. The scope of this thesis is to test experimentally and predict numerically the performance of a single MCFC in reversible mode, i.e., the cell operates switching between fuel cell mode (MCFC) and electrolysis mode (Molten Carbonate Electrolysis Cell, MCEC) in order to obtain more knowledge for the conditions that increase the electrical power or hydrogen production, respectively. Therefore, three experimental campaigns were carried out in order to study the performance of a single cell operating: 1) in fuel cell mode, 2) in reversible mode, and 3) in electrolysis mode through a long-term test. The single cell tested has an electrode-electrolyte interface area of 80 cm2. The aim of the first experimental campaign was to collect experimental data of the cell operating as MCFC which help to compare the cell performance with five different zero-dimensional models. Then, one model was selected in order to fit with the experimental data in fuel cell mode. During the second experimental campaign different operative parameters were tested in reversible mode to collect data in both operative modes. The fitted model was then compared in electrolysis mode with the experimental data acquired on the cell running in reversible mode. The program code was written in Anaconda Python 3.7. Finally, in the third experimental campaign, the cell was tested in electrolysis mode for almost 1000 h with the aim of studying the potential to operate the single cell as an electrolyzer.

2019-09-01T00:00:00Z