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CAPÍTULO I ... 15

INTRODUÇÃO ... 15

CAPÍTULO II ... 17

FUNDAMENTAÇÃO TEÓRICA ... 17

2.1. Impedância Acústica ... 20

2.2. Iterações das Ondas com Obstáculos ... 21

2.3. Cálculo dos Coeficientes de Reflexão e Transmissão ... 23

2.4. Determinação do Coeficiente de Absorção ... 26

2.5. Bandas de Freqüências ... 26

2.6. Modelagem Numérica ... 29

2.6.1. Modelos Numéricos Baseados na Geometria ... 30

2.6.2. Modelos Numéricos Baseados no Comportamento da Onda Acústica ... 30

2.6.3. Métodos de Diferenças Finitas ... 30

2.6.4. Guias Digitais de Ondas (Waveguide) ... 31

CAPÍTULO III ... 33

METODOLOGIA DE GUIAS DIGITAIS DE ONDAS – (DIGITAL WAVEGUIDE) ... 33

3.1 Guias Digitais de Ondas (Digital Waveguide) ... 34

3.2. Solução Discreta da Onda Usando Guias Digitais de Ondas ... 35

3.3. Impedância da Onda ... 37

3.4. Interconexão das Guias Digitais de Ondas: Juntas de Dispersão ... 38

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CAPÍTULO IV ... 45

CARACTERÍSTICAS DAS MALHAS DE GUIAS DIGITAIS DE ONDAS ... 45

4.1. Malha Bidimensional: SWG (Square Waveguide) – Malha Quadrada ... 45

4.2. Malha Bidimensional: TWG (Triangular Waveguide) – Malha Triangular... 50

4.3. Comparações entre as Topologias: Características Básicas e Operação ... 52

4.4. Estabilidade e Convergência ... 54

4.5. Erro de Dispersão ... 55

4.6. Malha tridimensional: Cubic Waveguide (Malha Cúbica) ... 58

CAPÍTULO V ... 62

RESULTADOS... 62

5.1. Detalhes da Modelagem Acústica ... 62

5.1.1. Modelagem da Fonte ... 62

5.1.2. Condições de Contorno... 62

5.1.3. Atenuação do som pelo ar ... 64

5.2. Software de Guias Digitais de Ondas ... 65

5.2.1. Banco de Dados ... 65

5.3 Resultados obtidos ... 65

5.3.1. Batimento ... 65

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Digitais de Ondas e Elementos Finitos ... 68

5.3.3. Tratamento Multifrequêncial ... 72

5.3.4. Modelagem 3D do Waveguide ... 78

CAPÍTULO VI ... 81

DOCUMENTACAO DO SISTEMA ... 81

6.1. Executando o Programa ... 81

6.2.Visualizando os resultados ... 85

CAPÍTULO VII ... 86

CONCLUSÂO... 86

7.1 . Trabalhos Futuros ... 86

CAPÍTULO VIII ... 88

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