Modelagem Computacional da Propagação Acústica Proveniente de Fontes Multifrequênciais Usando Guias Digitais de Ondas

Detalhes bibliográficos
Ano de defesa: 2009
Autor(a) principal: Boaventura, Ana Paula Freitas Vilela
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Uberlândia
BR
Programa de Pós-graduação em Engenharia Mecânica
Engenharias
UFU
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: https://repositorio.ufu.br/handle/123456789/14851
Resumo: The goal of this research is the creation of virtual acoustic environments, in this context, was constructed a computational tool, aiming to the acoustic modeling of reverberation environment. In this way, it was necessary to elaborate a numerical system able to simulate the wave sound propagation and, mainly its interactions with the surfaces encountered in the analyses. These interactions represent the basic wave phenomena, as reflection, transmission and absorption of sound waves by the obstacles. To obtain these objectives with this numerical model, it is necessary to separate into three important elements: the sound source, the room acoustic, and the listener, in this case, the receiver. Room acoustic modeling techniques can be divided into, for example, geometry-base and wave-based. In this work, a specific wave-base method has been adopted, the digital waveguide mesh. This methodology is a numerical system based on the known d Alembert solution for the General Wave Equation. The advantage of this method is that it can be easily describe the one-dimensional sound wave propagations between any two points in the space. The meshes created are, actually, digital waveguide interconnected, defining different geometries of mesh, as square, triangular, and others, for the 2D and for example cubic, for the 3D case. The information is captured in some points of interconnection of the waveguides, called scattering junctions. The whole formulation is based on the impedance properties of the environment. At particular, the waveguide technique is efficiency, by simplicity of algorithm, and by good results obtained for simulated Multifrequencial sources. To obtain a friendly interface, the code was written with a Language Object Oriented.