The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform
Sánchez H.t. - One of the best experts on this subject based on the ideXlab platform.
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
'Elsevier BV', 2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:En el presente trabajo, se estudia y analiza el mejor ajuste del eje del propulsor de un vehículo sumergible a su chumacera, mediante el estudio de la geometría de contacto entre dichos elementos. Para realizar este estudio, se ha aplicado un método semianalítico, basado en las normas de la cuadratura de los principales valores de Cauchy, el método de la secante, y un método numérico para la determinación del mapa tensional de las superficies en contacto entre el eje y la chumacera. Asumiendo que existen imperfecciones de micras en el mecanizado de las superficies en contacto, estas son una causa posible de daños subsuperficiales que favorecen fallos por picaduras (pitting ) o la formación y el crecimiento de las grietas por fatiga. Estos fallos afectan no solo el buen rendimiento propulsivo, sino también las condiciones de estanqueidad, con los consiguientes riesgos que ello supone para la integridad del buque. Los resultados permiten establecer los criterios de diseño en función de los módulos de Young, así como un mecanizado correcto y el ajuste de holguras posterior del sistema eje-chumacera, con lo cual se mejorala fiabilidad de dichos elementos.The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements.Peer Reviewe
Carrero-blanco J. - One of the best experts on this subject based on the ideXlab platform.
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
'Elsevier BV', 2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:En el presente trabajo, se estudia y analiza el mejor ajuste del eje del propulsor de un vehículo sumergible a su chumacera, mediante el estudio de la geometría de contacto entre dichos elementos. Para realizar este estudio, se ha aplicado un método semianalítico, basado en las normas de la cuadratura de los principales valores de Cauchy, el método de la secante, y un método numérico para la determinación del mapa tensional de las superficies en contacto entre el eje y la chumacera. Asumiendo que existen imperfecciones de micras en el mecanizado de las superficies en contacto, estas son una causa posible de daños subsuperficiales que favorecen fallos por picaduras (pitting ) o la formación y el crecimiento de las grietas por fatiga. Estos fallos afectan no solo el buen rendimiento propulsivo, sino también las condiciones de estanqueidad, con los consiguientes riesgos que ello supone para la integridad del buque. Los resultados permiten establecer los criterios de diseño en función de los módulos de Young, así como un mecanizado correcto y el ajuste de holguras posterior del sistema eje-chumacera, con lo cual se mejorala fiabilidad de dichos elementos.The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements.Peer Reviewe
Estrems M. - One of the best experts on this subject based on the ideXlab platform.
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements
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Semianalytical method for contact mechanic among shaft and bearing of a submarine vehicle
'Elsevier BV', 2016Co-Authors: Carrero-blanco J., Estrems M., Sánchez H.t.Abstract:En el presente trabajo, se estudia y analiza el mejor ajuste del eje del propulsor de un vehículo sumergible a su chumacera, mediante el estudio de la geometría de contacto entre dichos elementos. Para realizar este estudio, se ha aplicado un método semianalítico, basado en las normas de la cuadratura de los principales valores de Cauchy, el método de la secante, y un método numérico para la determinación del mapa tensional de las superficies en contacto entre el eje y la chumacera. Asumiendo que existen imperfecciones de micras en el mecanizado de las superficies en contacto, estas son una causa posible de daños subsuperficiales que favorecen fallos por picaduras (pitting ) o la formación y el crecimiento de las grietas por fatiga. Estos fallos afectan no solo el buen rendimiento propulsivo, sino también las condiciones de estanqueidad, con los consiguientes riesgos que ello supone para la integridad del buque. Los resultados permiten establecer los criterios de diseño en función de los módulos de Young, así como un mecanizado correcto y el ajuste de holguras posterior del sistema eje-chumacera, con lo cual se mejorala fiabilidad de dichos elementos.The present study analyzes the best attachment of the propeller shaft of a submersible to his bearing, studying geometry of contact between those elements. A semi-analytical method based on the rules of the quadrature of the main values of Cauchy, the secant method and a numerical method for determining a tension map have been applied to the study of the contact surfaces between shaft and bearing. It is assumed that there are imperfections in the order of microns when machining the contact surfaces, which can produce subsurface damage that is possible, linked to pitting and the growth of fatigue cracks. Such failures not only will influence on the proper propulsive performance, but also on the watertightness conditions, which is related to the risk of ship integrity loss. The results let us to set design criteria, which account for the Youngs Module and the importance of an adequate machining and further adjustment of clearances on the shaft-bearing system, thus improving the reliability of such elements.Peer Reviewe
Ding Sheng - One of the best experts on this subject based on the ideXlab platform.
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the date processing of the dynamic Youngs Module experiment
Laboratory Science, 2009Co-Authors: Ding ShengAbstract:The fundament and method of the measurement of Young's modulus by using dynamic were described.And the limitations of epitaxial method and double-ended approximation in experimental data processing and the method of experimental data processing by using orgin7.5 were also introduced.
Sandra Regina Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Tijolos de solo cimento reforçado com serragem de madeira
Universidade Federal de Minas Gerais, 2005Co-Authors: Sandra Regina Da SilvaAbstract:Neste trabalho é apresentado o estudo de tijolos confeccionados com a mistura solocimento-resíduos de madeira com o objetivo de determinar a sua resistência em função das características do solo e da dosagem de resíduos. Foram utilizados dois tipos de solos provenientes do campus da UFMG, cimento CPIII E-32-RS e serragem extraída de peças de Eucalyptus grandis e Eucalyptus cloeziana. Visando estabelecer limites de resistência, os solos naturais foram corrigidos de forma que fossem obtidos um solo mais arenoso e um solo mais argiloso. Para a determinação da mistura ótima, estudou-sea inclusão de teores de resíduos diferenciados (0%; 0,5%; 1%; 2% e 3%) nos dois solos confeccionados, onde foram avaliados corpos-de-prova, tijolos e prismas. A avaliação das peças confeccionadas foi feita a partir de ensaios de compressão simples ecompressão diametral em corpos-de-prova e ensaios de compressão simples em tijolos e prismas. A pressão de moldagem de corpos-de-prova e tijolos foi determinada através do monitoramento de célula de carga e manômetro. Foram estabelecidas relações entreo formato dos corpos-de-prova, tijolos e prismas através de equações. Ensaios nãodestrutivos foram realizados paralelamente aos ensaios de compressão, onde determinou-se o tempo de propagação da onda longitudinal em cada peça. A partir da velocidade média de propagação da onda ultra-sônica, da densidade e do teor de resíduo empregado, foi possível encontrar equações para a determinação da resistência àcompressão. Obteve-se uma relação entre o módulo de elasticidade da mistura e a resistência à compressão com o teor de resíduos empregado. Definida a mistura ótima e avaliando-se a ruptura dos tijolos ensaiados, três tijolos foram instrumentados com rosetas. A partir da análise experimental de tensões determinou-se o caminho daruptura, o coeficiente de Poisson e um valor a partir do qual seria atingido um possível limite de utilização. A inclusão de 0,5% de resíduos no solo mais arenoso mostrou ser a melhor dosagem por aumentar a resistência dos tijolos e prismas, diminuir o módulo de elasticidade e também aumentar a ductilidade do compósito. Os resultadosexperimentais comprovaram a eficiência e o elevado potencial de utilização, tornando o tijolo de solo-cimento-resíduos um promissor concorrente dos tijolos convencionais.This work presents the study of bricks made from a soil, cement and wooden residues mixture. Its objective is to determine its strength taking into account the characteristics of the soil and the residues dosage. Two soil types that originated from UFMG campus, CPIII E-32-RS cement and Eucalyptus grandis and Eucalyptus cloeziana sawdust were used as components of the bricks studied. To establish strength limits, the natural soil was corrected in way that it was possible to obtain a sandier and clayed one. To determine the optimum mixture, it was necessary to study the inclusion of different residues grades (0%; 0,5%; 1%; 2%; e 3%) at both soils. Specimens were tested using simple compression tests and diametrical compression tests. Prisms and bricks were tested using simple compression tests. The pressure used to cast the bricks wasdetermined through the load cell e manometer monitoring. Relationships between specimens, bricks e prisms shaping were established and equations were written. Non destructive tests were made as well and from those it was possible to determine the propagation time of the longitudinal wave in each sample. Through the average propagation ultrasonic wave speed, density and residue grade used, equations thatdetermine the compressive strength were found. It was also found a relationship between the mixtures Youngs Module and its compression strength. By the definition of the optimum mixture and the analyses of the rupture tested bricks, three bricks were instrumented with rosettes. Using stress experimental analyses, it was determined the rupture way, the Poissons coefficient of the brick and a value to a possible use limit.The inclusion of 0,5% residues in a sandier soil was the best dosage to increase the bricks strength and compositions ductility, reducing its Youngs Module. The experimental results proved the efficiency and high potential usefulness of the soil, cement and wooden residues bricks making them a promising competitor when compared with the conventional ones
