Estudo acústico de tubos de dimensões idênticas e materiais diferentes utilizando bocais de flauta doce e flauta transversal

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

19/08/2011

RESUMO

Even though scientists have shown so far that the materials used in the construction of flutes has little interference in their respective sound characteristics, it seems that there is more to be discussed, because many musicians still insist that the material used in the construction of flutes influences significantly the sound produced. Thus, aiming to search for results that can contribute in this discussion, an acoustic study was carried out with three pairs of tubes of identical dimensions, being two of them made of aluminum, two made of copper and two made of brass. The purpose of the study was to compare their respective harmonics sounds in three similar experiments: (Experiment 1) tubes coupled to a treble (alto) recorder mouthpiece, Yamaha branded, played by a flute player; (Experiment 2) tubes coupled to a transverse flute mouthpiece, in carbon fiber, specially built for this study, played by another flutist; (Experiment 3) tubes coupled to the same treble (alto) recorder mouthpiece, Yamaha brand, played by an artificial blower powered by a cylinder of nitrogen gas (99.9% of purity) with a controlled and continuous flow. Three audio signals were captured from each tube in each experiment, on a total of 54 measures. After data selection, in order to exclude parameters, only data with 2 liters/min of flow from Experiment 3 (6 measures) was processed and analyzed due to its best quality,best stability and greater accuracy in relation to data obtained in Experiments 1 and 2. Thus, it was observed that the fundamental sound and the first two harmonics sounds emitted by each tube were the factors that determined the profile of the sound emitted by the flutes used in this work. From a more detailed analysis of the frequency distribution adjusted with Lorentzian, it was found that the FWHM (full width at half maximum) of these factors determined the sound characteristic of each of the metals used. In addition, it was found that, from the realized experiments with fixed parameters (temperature, air humidity, gas flow, gas type, geometry and dimensions of the mouthpieces and tubes), that only type of material was the only factor that determines the profile of the sound produced by the flutes used in this work

ASSUNTO(S)

materiais som flauta acústica música acustica

ACESSO AO ARTIGO

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