Title: Stochastic exploration of ambiguities for nonrigid shape recovery
Authors: Moreno-Noguer, Francesc; Fua, Pascal
Abstract: Recovering the 3D shape of deformable surfaces from single images is known to be a highly ambiguous problem because many different shapes may have very similar projections. This is commonly addressed by restricting the set of possible shapes to linear combinations of deformation modes and by imposing additional geometric constraints. Unfortunately, because image measurements are noisy, such constraints do not always guarantee that the correct shape will be recovered. To overcome this limitation, we introduce a stochastic sampling approach to efficiently explore the set of solutions of an objective function based on point correspondences. This allows to propose a small set of ambiguous candidate 3D shapes and then use additional image information to choose the best one. As a proof of concept, we use either motion or shading cues to this end and show that we can handle a complex objective function without having to solve a difficult non-linear minimization problem. The advantages of our method are demonstrated on a variety of problems including both real and synthetic data.
Title: A complete analysis of axial piston pump leakage and output flow ripples
Authors: Bergada Graño, Josep Maria; Kumar, Sushil; Davies, Dyfyr Ll.; Watton, John
Title: The effect of oil pressure and temperature on barrel film thickness and barrel dynamics of an axial piston pump
Authors: Bergada Graño, Josep Maria; Davies, Dyfyr Ll.; Kumar, Sushil; Watton, John
Title: Axial piston pumps, new trends and development
Authors: Bergada Graño, Josep Maria; Kumar, Sushil; Watton, John
Title: Copoliésteres alifáticos derivados del ácido galactárico diacetalizado
Authors: Lavilla Aguilar, Cristina; Alla Bedahnane, Abdelilah; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Benito, Elena; García Martín, Maria de Gracia; Galbis Pérez, Juan Antonio; Muñoz Guerra, Sebastián
Title: An alternative method to quantify the electromagnetic immunity based on the Weibull distribution
Authors: Fernández García, Raúl; Gil Galí, Ignacio
Abstract: It is accepted that the electromagnetic interference should be addressed with statistical analysis. Usually the impact of electromagnetic interference on different electronic samples is evaluated and the average immunity level is used as a reference. However, this method does not provide enough information to know the probability of failure to the electromagnetic interferences of an electronic circuit. An alternative statistical analysis based on the Weibull distribution is presented. The typical and proposed methods have been compared in order to analyse the electromagnetic immunity performance of two types of operational amplifier. The results confirm the feasibility of the proposed method.
Title: Preface: Introduction to special issue
Authors: Guasch Petit, Antonio; Piera, M
Title: The effect of piston grooves performance in an axial piston pumps via CFD analysis
Authors: Kumar, Sushil; Bergada Graño, Josep Maria
Title: Optimal sizing of microgrids: a fast charging station case
Authors: Corchero García, Cristina; Cruz Zambrano, Miguel; Heredia, F.-Javier (Francisco Javier); Cairo Molins, Josep Ignasi; Igualada Gonzalez, Lucia; Romero Ortega, Aitor
Abstract: In this work we focus on the optimal design of
electric vehicle charging stations. We consider investment, operational
costs, physical constraints and different electricity pricing
strategies. The size of the various components in the microgrid
architecture and the suitability of the storage system are analysed.
The electric vehicle charging demand is modelled through a
Title: A new optimal electricity market bid model solved through perspective cuts
Authors: Corchero García, Cristina; Mijangos Fernández, Eugenio; Heredia, F.-Javier (Francisco Javier)
Abstract: On current electricity markets the electrical utilities are faced with very sophisticated decision making problems under uncertainty. Moreover, when focusing in the short-term management, generation companies must include some medium-term products that directly influence their short-term strategies. In this work, the bilateral and physical futures contracts are included into the day-ahead market bid following MIBEL rules and a stochastic quadratic mixed-integer programming model is presented. The complexity of this stochastic programming problem makes unpractical the resolution of large-scale instances with general-purpose optimization codes. Therefore, in order to gain efficiency, a polyhedral outer approximation of the quadratic objective function obtained by means of perspective cuts (PC) is proposed. A set of instances of the problem has been defined with real data and solved with the PC methodology. The numerical results obtained show the efficiency of this methodology compared with standard mixed quadratic optimization solvers.
Title: Real time diagnosis for a large gas turbine based on a deep model of the controller
Authors: Guasch Petit, Antonio; Sarrate Estruch, Ramon
Abstract: The ESPRIT project 6862 TIGER addresses the development of a real-time knowledge based
diagnosis system for two gas turbines: a large scale industrial gas turbine and an auxiliary
power unit for aviation. The project will combine the qualitative model based with the rule
based diagnosis approach.
This paper describes the rule based approach taken in the development of a real-time diagnostic
system for a large scale gas turbine. Deep models will be automatically extracted from the
deterministic knowledge embedded within the controller ladder logic diagrams. Heuristic
knowledge will be extracted from the domain expert and engineering manuals.
Title: Comblike Ionic Complexes of Poly(gamma-glutamic acid) and Alkanoylcholines Derived from Fatty Acids
Authors: Tolentino, Ainhoa; León, Salvador; Alla Bedahnane, Abdelilah; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon; Muñoz Guerra, Sebastián
Abstract: A series of ionic complexes with almost stoichio-
metric composition have been
from bacterial poly(
glutamic acid) and alkanoylcholines derived from fatty acids with
12, 14, 16, and 18 carbon atoms. The complexes were stable up to
temperatures close to 200
C and were non-water-soluble but
readily soluble in organic solvents. In the solid state they adopted
the biphasic structure typical of comblike systems with the
polypeptide chains arranged in sheets and periodically separated
by a para
nic phase which was partially crystallized for C14, C16,
and C18. The window width of the layered structure was
estimated by SAXS to be within the 3.6
4.5 nm range, and WAXS showed that the alkyl tails were crystallized in a hexagonally
packed lattice with a
spacing of 0.41 nm. These complexes displayed reversible melting of the para
nic phase in the 40
C range at temperatures with values increasing with the length of the alkanoyl group. A slight expansion of the intersheet
distance occurred at melting followed by contraction upon heating at higher temperatures but without signi
cant alteration of the
layered structure. The
C CP-MAS NMR analysis revealed the underlying polymethylene
conversion that takes place at the thermal transition. An energy-based simulation study of the crystallization process a
molecular picture of the complex and evidenced the favoring e
ect of the choline structure on the packing of the alkyl side
Title: Técnicas de simulación
Authors: Guasch Petit, Antonio; Hüber, Robert
Title: Task-based parallel breadth-first search in heterogeneous environments
Authors: Munguía, Lluis Miquel; Bader, David A.; Ayguadé Parra, Eduard
Abstract: Breadth-first search (BFS) is an essential
graph traversal strategy widely used in many computing
applications. Because of its irregular data access patterns,
BFS has become a non-trivial problem hard to parallelize
efficiently. In this paper, we introduce a parallelization
strategy that allows the load balancing of computation
resources as well as the execution of graph traversals in
hybrid environments composed of CPUs and GPUs. To
achieve that goal, we use a fine-grained task-based parallelization
scheme and the OmpSs programming model. We
obtain processing rates up to 2.8 billion traversed edges
per second with a single GPU and a multi-core processor.
Our study shows high processing rates are achievable
with hybrid environments despite the GPU communication
latency and memory coherence.
Title: Pain and anxiety treatment based on social robot interaction with children to improve patient experience. Ongoing research
Authors: Angulo Bahón, Cecilio; Garriga Berga, Carles; Luaces, Carlos; Perez Payarols, Jaume; Albo-Canals, Jordi; Díaz Boladeras, Marta
Abstract: A major focus for children’s quality of life programs
in hospitals is improving their experiences
during procedures. In anticipation of treatment,
children may become anxious and during procedures
pain appears. The aim of this article is to introduce
a proposal to design pioneering techniques
based on the use of social robots to improve the
patient experience by eliminating or minimizing
pain and anxiety. According to this proposed challenge,
this research aims to design and develop specific
human-social robot interaction with pet robots.
Robot interactive behavior will be designed based
on modular skills using soft-computing paradigms.
Title: Estudi de l'helicòpter coaxial UAV i disseny del controlador
Authors: Graugés Agustí, Gerard
Abstract: En aquest document es presenta un estudi complet sobre l’helicòpter coaxial UAV, la seva dinàmica, i control automàtic. En primer lloc s’analitzen els factors que intervenen en la física de l’helicòpter, per a acabar presentant un model no lineal que descrigui el sistema. A partir de simulacions, es valida el model no lineal i es procedeix a linealitzar-lo, amb l’objectiu final de dissenyar un controlador automàtic per l’helicòpter. A continuació de l’estudi sobre els aspectes de control, es presenta el controlador, i es mostren els resultats obtinguts. A la part final de l’estudi es presenten les conclusions extretes. Aquest document, també inclou al final un càlcul del pressupost de l’estudi, un anàlisi mediambiental, i la bibliografia emprada.
Title: Sistema per a la caracterització d'altaveus
Authors: Nomen Escoda, Oriol
Abstract: El present document recull el disseny mecànic d’un sistema de caracterització d’altaveus
realitzat per a l’empresa Amate Electroacústica S.L. en el marc d’un conveni de
col·laboració amb el CDEI-UPC (Centre de Disseny d’Equips Industrials de la Universitat
Politècnica de Catalunya), el CGIP i el LEAM.
L’objectiu del present treball ha estat dissenyar els mecanismes de posicionament de
l’altaveu per tal de poder realitzar caracteritzacions de l’altaveu en 3D dins d’una cambra
anecoica. D’aquesta manera, s’ha definit un primer mecanisme amb dos eixos
perpendiculars entre si, que mou l’altaveu realitzant l’escombrat d’una semiesfera, i un
segon mecanisme que permet el moviment del micròfon que adquireix la senyal sonora de
l’altaveu, per tal de poder variar la distància d’adquisició de la senyal.
Aquest sistema permet al client caracteritzar-se els altaveus que produeix a les seves
pròpies instal·lacions, donant un gran valor afegit al seu producte i estalviant-se els costos
d’externalització dels serveis de caracterització.
Per tal de dissenyar el sistema, s’ha partit d’unes especificacions amb el client que
defineixen els requeriments que el sistema ha de respectar.
Per tal de dimensionar els mecanismes, s’han utilitzat mètodes de selecció de motors tals
com el mètode del pla ?-W (potència transitòria - energia cinètica doble) basat en el
concepte de potència transitòria, així com mètodes de càlcul amb elements finits per al
càlcul estructural de la màquina.
El sistema de caracterització d’altaveus ha estat fabricat i posat en funcionament
satisfactòriament rebent el Premi a l’Impuls a la Recerca i a la Innovació de la Cambra de
Comerç de Terrassa l’any 2009.
Title: Estudio de un turbofan
Authors: López Granero, Jose Manuel
Description: El objetivo que este proyecto persigue es el de mostrar el diseño de un turbofan
en todo su conjunto. Debido a que este proceso de diseño es muy complejo y
normalmente se necesitan grandes grupos de ingenieros para su desarrollo, el
alcance del mismo dentro de un proyecto final de carrera queda muy limitado. No
obstante, se intenta dar una visión general de lo que es este proceso de diseño y
mostrar el camino a seguir a partir del trabajo desarrollado.
Title: Design of a three dimensional wall jet facility
Authors: Gelabert Roqueta, Josep
Abstract: The three dimensional wall jets can be found in some important industrial applications such as burners, boilers, gas turbine combustion chambers, vertical landing airplanes and fuel injection systems. This engineering field requires specific facilities where experiments and investigations can be undertaken. First the scope of the project contained the design, the building and the testing of the facility, but this scope had to be reduced in order to be able to finish the project in the established time. In Figure 1 is shown a schematic three dimensional view of the elements which will compose the entire facility.The project purpose is to design a facility which permits the measurement and study of the three dimensional wall jets using water and meant to use optical devices to measure the properties of the flow. After a deep review of the literature, I started to find the way to design in the most accurate manner the test section of the facility. However, the first results obtained for the dimensions of the test section were too large and I had to find the way to give a better design to achieve smaller dimensions. There is not a single method to follow to design such a facility like this, which makes it more complicated than it could seem at the first instance. Once the size of the test section was found, I continued with stress analysis
simulations which were helpful in order to choose the material for the test section and ensure that this part of the facility would be able to handle such a large amount of water.
Afterwards, the flow conditioner was designed. The flow conditioner is composed by a conical expansion, different wire screens, a straightener and a contraction which ensures that the flow at the exit of the flow conditioner has the desired characteristics.
Finally, the last part of the design was the selection of a water pump that could ensure that the water could flow through all the devices and satisfy the requirements set for the flow.
Title: Study of a lunar satellite navigation system
Authors: Saura Carretero, Gemma
Abstract: The objective of the present study is to hold a preliminary analysis and design of a lunar global satellite navigation system able to provide accurate positional information to operators on the surface or in low lunar orbits. The outcome is a set of indications concerning the implications inherent in such a system. This set of indications consists in the main objectives, requirements and constraints needed during the definition and implementation of an infrastructure for global precise positioning on the lunar surface.
In any preliminary mission analysis it is important to determine the design drivers. In our case, the main drivers are the orbital height, the number of satellites in the constellation, the orbital inclination and the number of orbital planes. These four parameters are the main characteristics that define the constellation performance, therefore their final selection is crucial for the mission success. In our case, two constraints have been applied in order to determine the constellation: (1) no more than three orbital planes and (2) no more than 18 satellites. The constellation selection process has been carried out with the help of computer simulation. Thanks to it, we were able to choose the constellation whose parameters combination resulted in the best performance. The final constellation has a height of 6500 km, three orbital planes, 15 satellites and an inclination of 90°.
In order to maintain the correct performance of the constellation, a station-keeping strategy has been developed. Computer simulation of the chosen constellation allowed us to quantify the perturbation effects on the satellites and to identify which perturbation is the primary source of orbital deviations. Central body gravitation, third body-perturbations and solar radiation pressure have been computed for a period of one year with the result of a propellant (also known as ?v) budget of 1 km/s.
Payload selection is an important step in the design process. The characterization of its mass, power and thermal requirements, and components influences the design of all the other subsystems. Relativistic effects on time are taken into account because the accuracy of the system depends on clock errors. The study concludes that, although relativistic effects on time are less significant on the constellation than on the terrestrial GPS system, they still need to be corrected.
This study also undertakes a preliminary design of the satellite subsystems. Power and mass budget are made and a preliminary analysis of the propulsion, thermal and communications subsystems are also carried out. The proposed preliminary satellite design consists in a 1000kg-1600W class platform which will transmit in the L-band (to the lunar surface) and in the X-band (to the Earth). If the station-keeping is carried out by a bipropellant thruster, the propellant budget needed is 225 kg. However, some indications for electrical propulsion for the station-keeping maneuvers are also provided. The thermal environment is the biggest challenge of the mission because of the Earth eclipses1. They can last more than 5 hours which leads to the temperature getting as low as -35°C. During lunar2 eclipses, secondary batteries can produce around 1300 W which will probably not be sufficient to maintain the spacecraft temperature within operational limits during Earth eclipses, so an extra set of batteries will be needed.