Ponencias (Instituto de Matemáticas de la Universidad de Sevilla (Antonio de Castro Brzezicki))

URI permanente para esta colecciónhttps://hdl.handle.net/11441/10981

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Mostrando 1 - 6 de 6

Motion-based design of active tuned mass dampers to control pedestrian-induced vibrations in footbridges under uncertainty conditions
(European Association Structural Dynamics, 2020-11-28) Jiménez Alonso, Javier Fernando; Soria, José Manuel; Concha Renedo, Carlos Martín de la; Guillén González, Francisco; Ecuaciones Diferenciales y Análisis Numérico; FQM131: Ecuaciones diferenciales, Simulación Num. y Desarrollo Software
Two key aspect must be considered for the design of modern footbridges: (i) their sensitivity to human-induced vibrations; and (ii) the influence of the variation of the operational and environmental conditions on their modal properties. One possible option, to guarantee an adequate behavior of these structures under both conditioning factors, is the installation of a control system. Among the different systems, active damping devices have shown a great effectiveness when they are used to control the dynamic response of civil engineering structures under uncertainty conditions. Different design algorithms have been proposed to guarantee that structures, controlled by these damping devices, meet the design requirements without compromising the budget. Among these proposals, the motion-based design method has shown a high performance when it has been implemented to design passive damping devices for footbridges under uncertainty conditions. Herein, this design method has been adapted and further implemented for the robust optimum design of active tuned mass dampers when they are employed to control the human-induced vibrations in slender footbridges. According to this method, the design problem can be transformed into two coupled sub-problems: (i) a multiobjective optimization sub-problem; and (ii) a reliability analysis sub-problem. Thus, the main objective is to find the parameters of the active damping device which guarantee an adequate comfort level without compromising its cost. The compliance of this vibration serviceability limit state is computed via a reliability index (related to the probability of failure), which takes into account the effect of the variation of the operational and environmental conditions on the modal properties of the structure.
Asymptotic behavior of the Stokes system in a thin film flow with a rough boundary
(Universidad da Coruña, 2010-09-11) Bresch, Didier; Casado Díaz, Juan; Luna Laynez, Manuel; Suárez Grau, Francisco Javier; Ecuaciones Diferenciales y Análisis Numérico; FQM309: Control y Homogeneización de Ecuaciones en Derivadas Parciales
We consider a problem that models fluid flow in a thin domain bounded by two surfaces. One of the surfaces is rough and moving, whereas the other is flat and stationary. The problem involves two small parameters ∊ and μ that describe film thickness and roughness wavelength, respectively. Depending on the ratio λ=∊/μ, three different flow regimes are obtained in the limit as both of them tend to zero. Time-dependent equations of Reynolds type are obtained in all three cases (Stokes roughness, Reynolds roughness and high-frequency roughness regime). The derivations of the limiting equations are based on formal expansions in the parameters ∊ and μ.
Resolution of the Frobenius Problem with an Adiabatic Quantum Computer
(Springer, 2021-07-13) Ossorio Castillo, Joaquín; Tornero Sánchez, José María; Álgebra; FQM218: Singularidades, Geometría Algebraica Aritmética, Grupos y Homotopía
The (Diophantine) Frobenius problem is a well-known NPhard problem (also called the stamp problem or the chicken nugget problem) whose origins lie in the realm of combinatorial number theory. In this paper we present an algorithm which solves it, via a translation into a QUBO problem of the so-called Ap´ery set of a numerical semigroup. This algorithm was specifically designed to run in an adiabatic quantum computer (a D-Wave 2X machine), and the performance problems for this precise setting are also discussed.
On q-polynomials and some of their applications
(2016) Álvarez Nodarse, Renato; Análisis Matemático; FQM262: Teoría de la Aproximación
Ordered weighted average optimization in multiobjective spanning tree problems
(2015) Fernández Areizaga, Elena; Pozo Montaño, Miguel Ángel; Puerto Albandoz, Justo; Scozzari, Andrea; Estadística e Investigación Operativa; FQM241: Grupo de Investigación en Localización; FQM331: Métodos y Modelos de la Estadística y la Investigación Operativa
Convergence to equilibrium for smectic-A liquid crystals in 3D domains
(2014) Guillén González, Francisco Manuel; Climent Ezquerra, María Blanca; Ecuaciones Diferenciales y Análisis Numérico; FQM131: Ec.diferenciales,Simulación Num.y Desarrollo Software

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