Comparação entre medição e simulação utilizando distintos programas de acústica de salas

Comparison between measurement and simulation of distinct room acoustics algorithms

Oliveira, S. Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil, sofia.oliveira@acad.ufsm.br

Brandão, E. Engenharia Acústica, Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil, eric.brandao@eac.ufsm.br

Melo, V. S. G. Engenharia Acústica, Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil, viviane.melo@ufsm.br

Tenenbaum, R. A. Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil, ratenenbaum@gmail.com

Mareze, P. Engenharia Acústica, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil, paulo.mareze@eac.ufsm.br

Resumo

O objetivo deste artigo é analisar o desempenho obtido por três programas distintos de simulação acústica de salas, dois deles desenvolvidos no meio acadêmico (um deles no Brasil) e um em âmbito comercial. Os algoritmos em questão baseiam-se em acústica geométrica, mas com diferentes implementações. A sala simulada foi adotada na última intercomparação internacional de simulação acústica e aurilização (Round Robin), e os dados geométricos e acústicos cuidadosamente medidos são fornecidos pelos organizadores do certame. Foram analisados quatro parâmetros acústicos (T30, EDT, C80 e D50), para dez pares fonte-receptor em bandas de oitava de 125 Hz a 8 kHz. Os erros médios relativos à diferença perceptível são também calculados. As principais conclusões são que existem desvios em relação aos resultados medidos para todos os software, com alguns parâmetros sendo melhor avaliados do que outros pelos distintos programas. Percepções preliminares sobre as vantagens e limitações de cada algoritmo são apresentadas, assim como uma análise das respostas impulsivas quadráticas que evidenciam a distribuição do decaimento da energia na sala fornecida por cada simulador.

Palavras-chaves:

simulação acústica de salas

comparação de desempenho de software

acústica geométrica.

Abstract

The objective of this research is to analyze the performance of three distinct room acoustics simulation software, two of them developed in the academic realm (one from Brazil) and one comercial software. The algorithms at hand are based in geometrics acoustics, but with different implementation. The simulated room was adopted at the last international inter-comparison on room acoustical simulation and auralization (Round Robin), the carefully measured geometric and acoustic data was supplied by the organization body. Four acoustic parameters were analyzed (T30, EDT, C80 and D50), for ten source-receiver pairs in octave bands from 125 Hz to 8 KHz. The relative mean errors, to the just noticeable difference, are also computed. The main findings are that there are deviations, relative to the measured results, in all software with some of the parameters better evaluated than others. Preliminary insights about the advantages and limitations of each algorithm are presented, as well as an analysis of the quadratic impulse responses that show the distribution of energy decay in the room provided by each simulator.

Keywords:

room acoustics simulation

software performance comparison

geometrical acoustics.

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