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Simplified Method of Simulating Double-Layer Micro-Perforated Panel Structure

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Abstract

The micro-perforated panel (MPP) structure has been widely used in various noise control applications, and thus its acoustic performance prediction has been receiving increasing attention. The acoustic performance of simple MPP structures, such as a MPP sound absorber, has been predicted using an analytical calculation method. However, this is not a suitable approach toward predicting the acoustic performance of complicated MPP structures, owing to the structural complexity of these structures. Moreover, the many perforations of submillimeter scale diameter render the MPP structures very difficult to analyze using numerical simulation. Thus, this study focused on two different simplified MPP simulation methods: the transfer admittance method and the equivalent fluid method, and their application on double-layer MPP structures. Based on the two simplified MPP simulation methods, the transmission loss value of the double-layer MPP mufflers with two sets of different structural parameters was calculated, respectively. The predicted results were compared with the impedance tube measurements. The results revealed that the two simplified MPP simulation methods could effectively predict the acoustic performance of double-layer MPP structures. Moreover, the prediction based on the transfer admittance method can outperform the two simplified simulation methods.

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Abbreviations

MPP:

Micro-perforated panel

FEM:

Finite element method

CFD:

Computational fluid dynamics

t :

Panel thickness

d :

Perforation diameter

p :

Perforation ratio

D 1, D 2 :

Cavity depth

b :

Perforation spacing

TL:

Transmission loss

v n1, v n2 :

Normal particle velocity

α 1, α 2, α 3, α 4, α 5, α 6 :

Transfer admittance coefficient

p 1, p 2 :

Sound pressure

β :

Transfer admittance

K :

Diameter ratio

Z :

Specific acoustic impedance

R :

Specific acoustic resistance

X :

Specific acoustic reactance

η :

Dynamic viscosity

ρ :

Air density

ω :

Angular frequency

f :

Frequency

φ :

Porosity

σ :

Flow resistivity

α ∞ :

Tortuosity

ε e :

Correction length

A v :

Viscous characteristic length

A t :

Thermal characteristic length

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Acknowledgements

This study was supported by the National Key Laboratory Open Foundation of Tractor Power System (Grant No. SKT2017012) and the National Natural Science Foundation of China (Grant No. 51575410).

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Wan Chen, Chihua Lu, Zhien Liu & Songze Du

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430070, China

    Wan Chen, Chihua Lu, Zhien Liu & Songze Du

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  1. Wan Chen
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  2. Chihua Lu
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  3. Zhien Liu
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  4. Songze Du
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Correspondence to Wan Chen.

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Chen, W., Lu, C., Liu, Z. et al. Simplified Method of Simulating Double-Layer Micro-Perforated Panel Structure. Automot. Innov. 1, 374–380 (2018). https://doi.org/10.1007/s42154-018-0040-x

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  • DOI: https://doi.org/10.1007/s42154-018-0040-x

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