Ubicación estratégica de material absorbente basado en el análisis modal de una sala

This grade work was carried out in order to test the hypothesis that the location of the absorbent material at the absolute sound pressure maxima of a room decreases the reverberation time in the octave band to which the mode frequency belongs. The results obtained in the reverberation time T_15 and T_20 of a room in the 125 Hz octave band are presented, in which, by means of a modal analysis, the location of the absorbent material was varied in order to obtain the maximum absorption of sound energy. For its implementation it was necessary to carry out a survey of a 3D model of the room and import it into a finite element simulation software, with which the absolute maximum and minimum sound pressure was determined. A simulation was then carried out in the CATT-Acoustics v9.1 software, in which two panel configurations were tested, one in which the absorbent material was placed at absolute maximum pressure and the other at minimum pressure. After the simulation, a measurement based on an experimental design was performed. The measurement involved 18 combinations of source location, microphones and absorber panel configuration, after which the responses to the impulse of each combination were found by means of the MATLAB software and the reverberation time for each measurement point was estimated consecutively by means of the plug-in aurora software Audacity 2.0.5. Finally, a statistical analysis was performed to determine the factors that were statistically significant in the measurement results.

• Autores: Tapias Pinzón, Diego Alejandro
• Fecha de publicación: 2019
• Institución: Universidad de San Buenaventura
• Repositorio: Repositorio USB
• Idioma: spa
• OAI Identifier: oai:bibliotecadigital.usb.edu.co:10819/7093
• Acceso en línea: http://hdl.handle.net/10819/7093
• Palabra clave: Modos; Vibración; Elementos finitos; Tiempo de reverberación; Convergencia de malla; Diseño de experimento; Absorción; Modes; Vibration; Finite elements; Reverberation time; Mesh convergence; Experiment design; Absorption; Absorción del sonido; Presión del sonido; Simulación por computadores; Simulación por software
• License: Atribución-NoComercial-SinDerivadas 2.5 Colombia