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TECHNICAL PAPERS

Structural-Acoustic Coupling Analysis of Two Cavities Connected by Boundary Structures and Small Holes

[+] Author and Article Information
Chang-Gi Ahn

 Toshiba Samsung Storage Technology, 416, Maetan-3Dong, Yeongtong-Gu, Suwon, Gyeonggi-Do 442-743, Korea

Hyoung Gil Choi

 Samsung Electronics Co., Ltd., 416, Maetan-3Dong, Yeongtong-Gu, Suwon, Gyeonggi-Do 442-743, Korea

Jang Moo Lee1

School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-742, Korealeejm@snu.ac.kr

1

Corresponding author.

J. Vib. Acoust 127(6), 566-574 (Dec 01, 2005) (9 pages) doi:10.1115/1.2110880 History:

In some passenger vehicles, unexpected acoustic modes in the low-frequency range may be observed that cannot be explained by the conventional vibro-acoustic coupling analysis. It is because these methods only use the dynamic characteristics of a vehicle structure and its compartment cavity. However, some small holes or gaps existing at the boundaries between the compartment cavity and the trunk cavity of the vehicles change the modal characteristics of a coupled system. In this paper, a new analytical method is presented to investigate the structural-acoustic coupling characteristics of two cavities connected by small holes and in-between boundary structures. Small holes are modeled as an equivalent mass-spring-damper system in the analysis. A theoretical formulation for vibro-acoustic characteristics of this system is made, and the modal expansion method is used to obtain eigenvalues and their mode shapes. The validity of the proposed method is successfully examined by comparing the results of the analytical predictions with those of experiments.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Three-dimensional model for two cavities coupled by a structure and a hole

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Figure 2

Mass flow model between two cavities through a connecting hole

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Figure 3

Pressure distribution of the natural modes of the coupled system

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Figure 4

Coupled natural frequency ratios with different material properties and dimensions of the coupled system.———hole mode,–––first structural mode,---first acoustic mode. (a) Young’s modulus (model 1). (b) Density (model 2). (c) Thickness (model 3). (d) Length of cavity a (model 4).

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Figure 5

Experimental setup for the measurement of natural modes of the coupled system. (a) Schematic diagram. (b) Photo.

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Figure 6

Frequency response functions of each cavity measured from experiments.———cavity a,---cavity b. (a) Driven in cavity a. (b) Driven in cavity b.

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