Supresión de modos de vibración acústicos con un resonador Helmholtz

AUTOR(ES)

Guiguet, Andrés, Welti, Reinaldo

FONTE

Revista Brasileira de Ensino de Física

DATA DE PUBLICAÇÃO

2003-09

RESUMO

The insertion of a Helmholtz resonator (HR) in the lateral walls of a tube containing stationary waves in its interior can be used to suppress one or more resonant modes if one chooses the resonator frequency appropriately. The HR can also operates like a filter for traveling waves. In this case, the HR attenuates the waves in a very selective frequency range. In textbooks on Acoustics, only the filtering process of traveling waves is explained. However, it is not simple to carry out experimental arrangement on small length Kundt tubes available in introductory physics laboratories that assures the presence of pure traveling waves inside the tube. Since there is not a theory for stationary waves and the experimental difficulties have produced some confusion in works approaching this topic, we present here a theoretical model to explain the RH behavior when it works like a filter for stationary waves and we point out the differences when it operates like a traveling waves filter.

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