Recursos de colección

Archivo Digital UPM (109.118 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Aeronáutica

Mostrando recursos 1 - 20 de 1.088

  1. The UPMSat-2 Satellite: an academic project within aerospace engineering education

    Pindado Carrion, Santiago; Roibás-Millán, Elena; Cubas Cano, Javier; García, Andrés; Sanz Andres, Angel Pedro; Franchini, Sebastián; Pérez Grande, María Isabel; Alonso, Gustavo; Pérez-Álvarez, Javier; Sorribes Palmer, Felix; Fernandez-López, Antonio; Ogueta-Gutierrez, Mikel; Zamorano, Juan; Puente Alfaro, Juan Antonio de la; Alonso, Alejandro; Garrido, Jorge
    Today, project-based learning is a well-known methodology in engineering education. In the IDR/UPM Institute of Universidad Politécnica de Madrid (UPM), different lines of research have been developed to involve students into projects related to aerodynamics (both theoretical and experimental), fluid dynamics on low gravity, and space science (heat transfer). Although these lines of research were initially related to the Ph.D. programs integrated within the academic plan of the university, the increasing interest among the bachelor and master students on research and projects linked to the most advanced engineering techniques, prompted the IDR/UPM academic staff to offer some specific projects to these...

  2. Libro de Actas del VI Congreso de estudiantes universitarios de Ciencia, Tecnología e Ingeniería Agronómica

    Compendio de los trabajos presentados en el VI Congreso de estudiantes universitarios que organiza la Escuela de Agrónomos

  3. Envejecimiento hidrotérmico en nanocompuestos epoxi/organoarcilla

    Gómez, A.; García del Cid, M.A.; Gonzalez Prolongo, Margarita; Salom Coll, Catalina; Masegosa Fanego, Rosa Maria
    Las dispersiones de organoarcillas como refuerzo en nanocompuestos de matriz polimérica han sido ampliamente estudiadas como una vía en la mejora de las propiedades (mecánicas, térmicas, de barrera frente a gases y disolventes e inflamabilidad). Una ventaja añadida es que se consigue una mejora de propiedades con la adición de una pequeña cantidad de refuerzo. En este trabajo se han preparado nanocompuestos basados en una matriz epoxi tipo DGEBA reforzada con dos organoarcillas, C30B e I.30E. Con el fin de mejorar la interfase matriz-refuerzo, también se han preparado nanocompuestos en los que las organoarcillas han sido previamente funcionalizadas a través...

  4. Transition prediction in incompressible boundary layer with finite-amplitude streaks

    Martin Bautista, Juan Angel; Paredes Gonzalez, Pedro
    Modulating the boundary layer velocity profile is a very promising strategy for achieving transition delay, and thus reducing the friction of the plate. An usual way to perform it is by perturbing the flow with counter-rotating vortices that exhibit transient, non-modal growth and lead to streamwise aligned streaks inside the boundary layer, which have been proved (theoretical and experimentally) to be very robust flow structures. Recently, a new mechanism of generating high amplitude streaks has been proposed, consisting on miniature vortex generators (MVGs), increasing considerably the potential stabilization effect. Hence, we propose a numerical tool to analyze the stability properties...

  5. Análisis del flujo en atomizadores de presión con giro

    Pereña Tapiador, Ángel
    Los atomizadores de presión con giro son uno de los tipos más comunes de atomizador. En ellos el líquido es inyectado en una cámara axilsimétrica a través de unos canales tangentes a su pared lateral que imprimen una velocidad de giro al líquido, dando lugar a un torbellino hueco con un núcleo de aire que se extiende a lo largo del eje de la cámara. El líquido, tras atravesar una región convergente, fluye a través de un orificio de salida concéntrico a la cámara, formando una lámina anular. Esta lámina, al abandonar el orificio, se expande radialmente, tomando inicialmente una...

  6. Theoretical model for droplet deformation and trajectory in continously accelerating flows

    Sor Mendi, Suthyvann
    El principal objetivo de la tesis es proponer un modelo de trayectoria y deformación de gotas inmersas en un campo fluido continuamente acelerado. Asumiendo que la trayectoria de la gota viene definida por dos ecuaciones dinámicas que representan el equilibrio de fuerzas en dirección horizontal y en dirección vertical, y una tercera ecuación que modela la deformación de la gota, se ha considerado especialmente tres aspectos: el modelo del coeficiente de resistencia en un flujo no estacionario, el modelo de deformación de la gota inmersa en un campo fluido continuamente acelerado y el modelo de acoplamiento entre el coeficiente de...

  7. Wind turbine fatigue loads statistical estimation from standard signals

    Pérez Campuzano, Darío
    Fatigue loads represent a critical element in several aeronautical applications and Wind Turbines (WTs) are not an exception. Their evolution over the machine service life usually determines its life span, hence their behavior knowledge can cause a relevant economic impact on the Cost of Energy (CoE). Nevertheless, their measurements are frequently difficult or expensive and estimations arising from other known signals can be carried out instead. This thesis aims to design a load estimation model using standard signal as inputs by means of statistical and machine learning procedures. It includes an input selection stage and the models layout arrangement and assessment,...

  8. Betunes modificados con azufre: aditivos estabilizadores

    Masegosa Fanego, Rosa Maria; Cañamero, Pedro; Viñas Sanchez, Maria Teresa; Sánchez Cabezudo, Marta; Salom Coll, Catalina; Gonzalez Prolongo, Margarita; Paez, Antonio
    En el presente trabajo se estudia la influencia de aditivos encaminados a conseguir la estabilidad de dichos betunes modificados. Mediante medidas de viscosidad y penetración se ha comprobado que la presencia combinada de diciclopentadieno + aminas, favorece la interacción del azufre con el betún por formación de polisulfuros. Asimismo, se ha analizado la influencia de inhibidores de radicales libres

  9. Modeling of thermal effect on the electronic properties of photovoltaic perovskite CH3NH3PbI3: the case of tetragonal phase

    Montero Alejo, Ana L.; Menéndez-Proupin, E.; Hidalgo-Rojas, D.; Palacios Clemente, Pablo; Wahnon Benarroch, Perla; Conesa, J.C.
    Hybrid organic-inorganic perovskites are semiconductors with disordered structures and remarkable properties for photovoltaic applications. Many theoretical investigations have attempted to obtain structural models of the high-temperature phases, but most of them are focused on the mobility of organic components and their implications in material properties. Herein we propose a set of geometric variables to evaluate the conformation of the inorganic framework at each phase of methylammonium lead iodide perovskite. We show that the analysis of these variables is required to ensure consistent structural models of the tetragonal phase. We explore the theoretical ingredients needed to achieve good models of this...

  10. Developing models for future real-time platforms: Virtual simulation and design of new components and systems for aircraft and remotely piloted aircraft systems

    Garcia Hernandez, Luis; Cuerno Rejado, Cristina; Gandía Agüera, Fernando; Rodriguez Sevillano, Angel Antonio; Cervero Torrell, Albert; Moreno, Ginés; Barcala Montejano, Miguel Angel; Peña Rodriguez, Alberto; Estensoro Astigarraga, Francisco Jose; Lasa Aguirrebengoa, Joseba; Pelayo Rivera, Alberto
    In the development of electrified and other vehicle systems, the modelling and simulation of the vehicle is very important. With these tools the preliminary design, as well as later detailed studies of the systems developed, allow engineers to spend less time on each phase of their projects or address them with an integrated approach. In addition, this integrated approach provides the possibility of building hardware-in-the loop models with all the components required. This vehicle modelling and simulation has gained more interest with the increasing use of a wide variety of RPAS, ranging from light weight micro aircraft to large vehicles...

  11. A design for rapid transit networks considering rolling stock's reliability and redistribution of services during disruptions

    Codina Sancho, Esteve; Marín Gracia, Angel; Montero Mercade, Lidia
    This paper presents a model for designing a public transit network system combining the traditional approach of transport demand coverage in bimodal scenarios of operation with the recovery of possible disruptions due to limited reliability of the rolling stock. The model balances construction and operational costs with the benefits to the users for the optimization of their travel times. Two transportation modes have been considered, public and private transport and the proportion of the users choosing one mode or the other is assumed to obey to a bimodal logit choice model. While construction costs are a first stage decision, user...

  12. Diseño de una instalación para ensayo de pilas de combustible en condiciones atmosféricas de vuelo de un avión no tripulado

    González Espasandín, Oscar; Navarro Arevalo, Emilio; Raso García, Miguel Ángel; Leo Mena, Teresa de Jesus
    Después de estudiar la idoneidad de las pilas de combustible tipo PEM de hidrógeno y DMFC de metanol directo para su utilización en sistemas propulsivos de aeronaves no tripuladas (UAV), se procedió a simular sus respectivas curvas de polarización en condiciones de vuelo. Es importante estudiar cómo afecta al rendimiento de las pilas de combustible la variación de las condiciones atmosféricas durante el vuelo de un UAV, dado que la mayor parte de los sistemas comerciales están concebidos para su uso en tierra. Por tanto, es de interés la validación de esos modelos de simulación a partir de datos experimentales. Para ello, se presenta en este trabajo...

  13. Scaling and universality in the human voice

    Luque Serrano, Jordi; Luque Serrano, Bartolome; Lacasa Saiz de Arce, Lucas
    Speech is a distinctive complex feature of human capabilities. In order to understand the physics underlying speech production, in this work, we empirically analyse the statistics of large human speech datasets ranging several languages. We first show that during speech, the energy is unevenly released and powerlaw distributed, reporting a universal robust Gutenberg–Richter-like law in speech. We further show that such ‘earthquakes in speech’ show temporal correlations, as the interevent statistics are again power-law distributed. As this feature takes place in the intraphoneme range, we conjecture that the process responsible for this complex phenomenon is not cognitive, but it resides in the physiological (mechanical)...

  14. Obtaining cloud top height from WRF model vertical profiles: application to the EUSO program

    Merino, A.; Sánchez, J.L.; López, L.; Gascón, E.; García-Ortega, E.; Hermida, L.; Fernández-González, S.; Soriano, J.F; Sáez-Cano, G.; del Peral, L.; Reyes, M.; Joven, E.; Martín, Y.; Licandro, J.; Franchini Longhi, Sebastian Nicolas; Rodríguez Frías, M.D.
    The objective of the Extreme Universe Space Observatory (EUSO) program is detection and measurement of high-energy particles that reach earth?s atmosphere from space. Clouds at mid and upper levels of the troposphere can interfere with such detection. Therefore, determining cloud top height with high accuracy is crucial to estimating the effect of clouds on these measurements.With this aim, we developed a method to extract that height using cloud temperature via vertical profiles predicted by the WRF model.

  15. Efficient low dimensional modelling based on POD and residual estimates

    Rapun Banzo, Maria Luisa; Terragni, Filippo; Vega De Prada, Jose Manuel
    An adaptive low dimensional model is considered to simulate time dependent dynamics in nonlinear dissipative systems governed by partial differential equations. The method combines "on the fly" a standard numerical solver and a much more computationally inexpensive Galerkin system. The latter is constructed by projecting the governing equations onto adapting sets of POD modes, resulting from snapshots computed by the numerical solver. The strategy is based on a truncation error estimate and a residual estimate, designed to control the truncation error and the mode truncation instability, respectively. These estimates support the selection of the appropriate time intervals in which the...

  16. Fast time integration of PDEs combining POD and Galerkin projection based on a limited set of mesh points

    Rapun Banzo, Maria Luisa; Vega De Prada, Jose Manuel; Terragni, Filippo
    Recently, an adaptive method to accelerate time dependent numerical solvers of systems of PDEs that require a high cost in computational time and memory has been proposed [3] (see also [1, 2]). The method combines on the fly such numerical solver with a proper orthogonal decomposition, from which we identify modes, a Galerkin projection (that provides a reduced system of equations), and the integration of the reduced system. The strategy is based on a truncation error estimate and a residual estimate, designed to control the truncation error and the mode truncation instability, respectively. These estimates support the selection of the...

  17. Smooth and controlled recovery planning of disruptions in rapid transit networks

    Cadarso Morga, Luis; Maróti, Gábor; Marín Gracia, Angel
    This paper studies the disruption management problem of rapid transit rail networks. We consider an integrated model for the recovery of the timetable and the rolling stock schedules. We propose a new approach to deal with large-scale disruptions: we limit the number of simultaneous schedule changes as much as possible, and we control the length of the recovery period, in addition to the traditional objective criteria such as service quality and operational costs. Our new criteria express two goals: the recovery schedules can easily be implemented in practice, and the operations quickly return to the originally planned schedules after the...

  18. Enhanced mechanical energy extraction from transverse galloping using a dual mass system

    Vicente-Ludlam, David; Barrero Gil, Antonio; Velázquez, A.
    This paper offers a theoretical study of energy extraction through transverse galloping using a dual-mass system. To this end, a two-degree-of-freedom model is developed where fluid forces on the galloping body are described resorting to quasi-steady hypothesis; the model is solved approximately by using the Harmonic Balance Method. Three possible configurations of the dual-mass system have been analyzed. Two of them show an improvement in the efficiency of energy extraction with respect to that of the single mass configuration when the mechanical properties of the dual-mass system are appropriately chosen. In addition, the dual-mass system promotes a broadening of the...

  19. Optimal electromagnetic energy extraction from transverse galloping

    Vicente-Ludlam, David; Barrero Gil, Antonio; Velázquez, A.
    A fully coupled electro-fluid-elastic model for electromagnetic energy harvesting from Transverse Galloping is presented here. The model considers a one degree-of-freedom galloping oscillator where fluid forces are described resorting to quasi-steady conditions; the electromagnetic generator is modelled by an equivalent electrical circuit where power is dissipated at an electrical load resistance; the galloping oscillator and the electromagnetic model are coupled appropriately. Two different levels of simplification have been made depending on the comparison between the characteristic electrical and mechanical timescales. The effect of the electrical resistance load on the energy harvested is studied theoretically. For fixed geometry and mechanical parameters,...

  20. Identifying open issues for reduced-crew operation in the cockpit of large civil aircrafts and implications for the future ATM system

    Saez Nieto, Francisco Javier
    Workshop durante el World ATM Congress celebrado el año 2015 en el que se abordaron temas de cómo afectará al futuro sistema de gestión de tráfico aéreo la reducción del número de pilotos a bordo de las aeronaves comerciales en el futuro.

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