Analysis of the acoustical behavior of cavities using impedance functions

作者：Guimaraes Gustavo Paulinelli^*; Pirk Rogerio; Souto Carlos D'Andrade; Sandoval Goes Luiz Carlos

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2016, 38(4): 1103-1111.

DOI：10.1007/s40430-015-0428-z

• Acoustics
• Acoustic cavity
• Experimental modal analysis
• Impedance function
• Acoustic FEM

The acoustic design of cavities is an important task in a variety of engineering applications, from automotive or aerospace industries to equipment coating designs. In this work, the acoustic impedance functions (a frequency domain model) were calculated using analytical, numerical, and experimental methods. Those different approaches were presented in a unified manner in order to allow comparisons among them. The relationship of the impedance function and a classical frequency response FRF) was also established. A circular duct of rigid walls was assumed with different boundary conditions as closed end, as well as opened and absorbed extremities. Three duct configurations were implemented in order to compare analytical, numerical, and experimental results. Finally, it could be possible to evaluate some aspects that are characteristic of a large range of acoustic systems applications as the existence of complex modes and frequency-dependent behavior of absorption material. This study aims the usage of the impedance functions to analyze the acoustic behavior of cavities, as well as to compose the background in order to develop, in the future, an acoustic modeling process using impedance functions.

• 出版日期2016-4