Abstract
As one of the basic acoustic parameters, the speed of sound is of great importance when considering acoustic effect. This paper explores the equivalent speed of sound, when the structure is modelled as a homogeneous fluid, for a periodic arrangement of a waveguide with alternating channel height similar to a honeycomb structure with open cells. Numerical simulation shows that the equivalent speed of sound is lower than that of pure air and the most important parameter is the height ratio of the waveguide. The lower speed of sound is caused by the increased inertial effect. This inertial effect can be precisely interpreted by the classic concept of tortuosity, which depicts the effect of tortuous fluid path.
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Acknowledgments
The project is supported by a China National Key Basic Research Scheme, or “973” scheme (2012CB7202). The first author also acknowledges the support of the PhD studentship from the University of Hong Kong.
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Jiang, C.Y., He, X.L., Huang, L.X. (2016). Equivalent Acoustic Parameters in a Periodical Waveguide Structure. In: Zhou, Y., Lucey, A., Liu, Y., Huang, L. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48868-3_13
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DOI: https://doi.org/10.1007/978-3-662-48868-3_13
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