Auralización interactiva de barreras acústicas utilizando el método de acústica geométrica y elementos finitos

The present work aims to develop an interactive auralization system comprising the entire frequency range of human hearing. The objective is to auralize the screening effect produced by an acoustic barrier (AB). This objective was accomplished with the integration of two methods used to model the propagation of sound: Geometrical Acoustics (GA) and Finite Element (FE). This system allows users to move and rotate in a virtual environment perceiving the pressure variations of the sound field according to its spatial location. The inclusion of the FE method for the numerical solution of the wave equation is a consequence of the limitation of the GA method at low frequencies. In the addition, the use of this tool allows the calculation of the transmission loss (TL) of the acoustic barrier, as well as the estimation of the diffraction phenomenon. Based on the above arguments, a free-field domain was designed for both methods, with the assumption of anechoic boundary conditions. The following step was the synthesis of B-format signals that contain the spatial information of the domain. In GA, the creation of B-Format signals is done by the export of Wav files generated by the software. In the case of FE, it is done through the formulation of an inverse problem, that using discrete pressure data allows the determination of the synthesis of the complex spherical harmonic coefficients. After obtaining the B-Format signals in both GA and FE, a crossover to integrate the impulse responses (IR) obtained by both methods is designed. Additionally, an algorithm developed in Max and articulated with Unity software is created in order to generate a visual interface that allows the real-time spacialization of the effect of a AB based on the position and orientation of an avatar within a virtual environment. Finally, the result is the rendering of the sound pressure considering the effect of an AB by means of the two above mentioned methods. Consequently, a computational tool to auralize the screening effect generated of a AB in real-time is provided.

• Autores: Silva Carmona, Sergio; Moreno Gil, Andrés Felipe
• Fecha de publicación: 2019
• Institución: Universidad de San Buenaventura
• Repositorio: Repositorio USB
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.usb.edu.co:10819/6821
• Acceso en línea: http://hdl.handle.net/10819/6821
• Palabra clave: Auralización; Acústica geométrica; Elementos finitos; B-Format; Barrera acústica; Auralization; Geometrical Acoustics; Finite Elements; Acoustic Barrier; Ingeniería de sonido; Transmisión del sonido; Fuentes de sonido; Difusión del sonido; Reproducción de sonido; Reflexión del sonido; Absorción del sonido; Propagación del sonido; Difracción del sonido; Presión del sonido; Intensidad acústica; Fuentes acústicas; Aislamiento acústico; Potencia acústica; Filtros acústicos; Acústica
• License: Atribución-NoComercial-SinDerivadas 2.5 Colombia