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http://hdl.handle.net/10397/106300
Title: | Acoustic modelling and analyses of geometrically complex systems with micro-perforated panels | Authors: | Zhang, X Cheng, L Liu, Y Du, J |
Issue Date: | 12-May-2021 | Source: | Journal of sound and vibration, 12 May 2021, v. 499, 115995 | Abstract: | Modeling of vibro/acoustic systems with embedded acoustic components of complex geometries is a challenging task. In particular, the presence of irregular-shaped acoustic modules, which are usually treated by finite element (FE) method, increases system complexities and makes the use of existing sub-structuring modeling techniques cumbersome. To tackle the problem, an efficient three-dimensional sub-structuring modeling method is proposed in this paper. As an important sub-structural module, a dedicated coordinate transformation technique is established to cope with polygon acoustic components. The embodiment of the technique into the existing sub-structuring framework avoids the use of conventional FE modules, thus increasing the flexibility and the efficiency of the simulation, conducive to system optimization. As an example, noise reduction in a duct, comprising a Micro-Perforated Panel (MPP) liner and a trapezoidal expansion chamber, is examined. The accuracy of the proposed model is firstly validated against both FE simulations and experiments. Numerical results uncover a dual hybrid sound reduction process, namely sound absorption of the MPP and wave reflection due to the geometry changes of the duct. Optimizations based on the proposed sub-structuring technique allow one to balance the hybrid reflective-absorptive effects through proper parameter tuning to maximize the sound attenuation within a prescribed frequency range. | Keywords: | Geometrically complex systems Hybrid sound reduction Micro-perforated panels Modelling method Optimization |
Publisher: | Elsevier Ltd | Journal: | Journal of sound and vibration | ISSN: | 0022-460X | EISSN: | 1095-8568 | DOI: | 10.1016/j.jsv.2021.115995 | Rights: | © 2021 Elsevier Ltd. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Zhang, X., Cheng, L., Liu, Y., & Du, J. (2021). Acoustic modelling and analyses of geometrically complex systems with Micro-perforated panels. Journal of Sound and Vibration, 499, 115995 is available at https://doi.org/10.1016/j.jsv.2021.115995. |
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Zhang_Acoustic_Modelling_Analyses.pdf | Pre-Published version | 2.46 MB | Adobe PDF | View/Open |
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