Numerical analysis of the modal coupling at low resonances in a Colombian Andean Bandola in C using the finite element method

The work presented in this thesis is concerned with the dynamical behavior of a CBandola's acoustical box at low resonances -- Two models consisting of two and three coupled oscillators are proposed in order to analyse the response at the first two and three resonances, respectively -- These models describe the first resonances in a bandola as a combination of the lowest modes of vibration of enclosed air, top and back plates -- Physically, the coupling between these elements is caused by the fluid-structure interaction that gives rise to coupled modes of vibration for the assembled resonance box -- In this sense, the coupling in the models is expressed in terms of the ratio of effective areas and masses of the elements which is an useful parameter to control the coupling -- Numerical models are developed for the analysis of modal coupling which is performed using the Finite Element Method -- First, it is analysed the modal behavior of separate elements: enclosed air, top plate and back plate -- This step is important to identify participating modes in the coupling -- Then, a numerical model of the resonance box is used to compute the coupled modes -- The computation of normal modes of vibration was executed in the frequency range of 0-800Hz -- Although the introduced models of coupled oscillators only predict maximum the first three resonances, they also allow to study qualitatively the coupling between the rest of the computed modes in the range -- Considering that dynamic response of a structure can be described in terms of the modal parameters, this work represents, in a good approach, the basic behavior of a CBandola, although experimental measurements are suggested as further work to verify the obtained results and get more information about some characteristics of the coupled modes, for instance, the phase of vibration of the air mode and the radiation e ciency

La noción del aparato sonoro en la obra de tres artistas colombianos

En este trabajo se propone realizar un análisis del elemento sonoro en las prácticas de tres artistas contemporáneos colombianos -- Esta búsqueda se realiza desde una mirada filosófica que indaga sobre cómo el sonido conecta el cuerpo opaco interior del ser con el mundo exterior, tratando y se sustenta en la forma en la que los artistas utilizan el sonido en sus obras, teniendo como punto de partida esa pretensión de alcances ontológicos: sonido que define al ser y su relación con el mundo y da lugar al interrogante sobre cuál es la resonancia de ese mundo interior en la creación de la obra artística -- La idea fundamental de esta búsqueda está sustentada en la existencia de los cambios en la sensibilidad implicados en la irrupción del aparato sonoro en la cotidianidad -- El sustento referencial se acerca de manera directa a plantear la existencia de un ser sonoro, permeado desde antes de nacer por la onda vibratoria; un ser producto de fuerzas históricas moldeadas en la resonancia -- Se utiliza el concepto de acusmática para proponer un régimen de lo sonoro, allí donde de manera directa se insertan todos los dispositivos que al aparecer interrogan y jalonan la percepción