Avaliação da qualidade do campo acústico de uma câmara reverberante
In order to assure the quality of obtained information, research equipment must be verified to confirm that its use don’t compromise the research executed. Therefore, the new reverberant chamber built on UTFPR campus Curitiba need to be qualified according to standard só it can be used on future res...
| Principais autores: | Sprorowski, Augusto Ivama, Alberts, Marco |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/10635 |
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| Resumo: |
In order to assure the quality of obtained information, research equipment must be verified to confirm that its use don’t compromise the research executed. Therefore, the new reverberant chamber built on UTFPR campus Curitiba need to be qualified according to standard só it can be used on future researches. The objective of this monography is to evaluate the reverberant chamber’s acoustic field using the methodology described in ISO standard 10140, primarily. To evaluate the chamber the main goal is to qualify it regarding the acoustics insulation of constructions material and consequently the frequency bands to whom the chamber can be used as a reverberant chamber. Using the method described on the ISO standard used on this monography, and based on parameters used on similar qualifications described on ISO standard 3741(sound pressure), the data acquisition was executed and used on the qualification. Data obtain initially shown a counter-intuitive result once the increase in the number of diffusers doesn’t reflect in the improvement of the acoustic field homogeneity through standard deviation observation. To confirm the initial conclusion, a second data acquisition was executed. The data obtained was more refined but yet shown similar results. Can be noticed a trend regarding the increase of standard deviation as the number of diffusers increases (mainly on high frequencies), but can’t notice an increase in the number of frequency bands to which the chamber can be considered reverberant as was expected. The conclusion is that, according to ISO standard 3741, the chamber studied can only be considered reverberant to frequencies above 1.25 kHz to any given number of diffusers. To the current situation of the chamber is recommended not to use diffusers. The results obtained shows that the researches that question the ISO standards may be correct, once the method described is not enough to qualify the studied chamber, making questionable the standard’s efficiency. |
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