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Research Papers

An Optimum Embossment of Rectangular Section in Panel to Minimize Noise Power

[+] Author and Article Information
Jin-Young Jeon

Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1-I3-15, O-okayama, Meguro-ku, Tokyo 152-8552, Japanjeonjy70@naver.com

Masaaki Okuma

Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1-I3-15, O-okayama, Meguro-ku, Tokyo 152-8552, Japanmokuma@mech.titech.ac.jp

J. Vib. Acoust 130(2), 021012 (Mar 21, 2008) (7 pages) doi:10.1115/1.2748456 History: Received June 09, 2004; Revised February 20, 2007; Published March 21, 2008

In this paper, the authors propose a new method for optimum design of embossed panel sections on vibrating panel-like structures to reduce noise. It is proposed in the method to use the mapping of sound pressure level on the vibrating panel’s surface for best positioning of an embossed panel section, which means a raised panel section, in other words, and to apply the particle swarm optimization algorithm for determining the best dimensions of the embossed panel section. The optimum design method is applied to a rectangular aluminum panel whose size is 0.45m×0.4m with thickness 0.001m under the boundary condition of clamping four edge lines. Then, according to the optimum design, an embossed section is actually made in each panel by embossing using a press machine, and experiments are carried out to the panels for verification. The application study is carried out for two cases of different positions of a point force excitation on the panels. The two applications demonstrate that the embossed panel sections designed by the optimization method can realize good reduction of sound power.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 13

Comparison of the SPL for the original and optimized panel in excitation at center point (under applying 1N impulse force)

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Figure 14

Comparison of the SPL for the original and optimized panel under a point force excitation at a point in the middle, between the center and a corner (under applying 1N impulse force)

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Figure 1

Exterior problem

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Figure 2

Observation points

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Figure 3

IMEP in excitation at center point: (a) 3D RARC and (b) 2D RARC

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Figure 4

IMEP in excitation at a point in the middle between the center and a corner: (a) 3D RARC and (b) 2D RARC

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Figure 10

Convergence history for case 2

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Figure 11

Schematic of optimum embossed panel section under a point force excitation at a point in the middle, between the center and a corner

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Figure 12

Clamped panels: (a) original panel, (b) optimized panel (case1), and (c) optimized panel (case2)

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Figure 5

Samples of feasible embossed panel section: (a) at center point and (b) at a point in the middle between the center and a corner

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Figure 6

Comparison of the SPL for the original and optimized panel (the SPL is response under the excitation of 1N impulse force at the panel center)

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Figure 7

Convergence history for case 1

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Figure 8

Schematic of optimum embossed panel section in excitation at panel center

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Figure 9

Comparison of the SPL for the original and optimized panel (the SPL is response under the excitation of 1N impulse force at a point in the middle between the panel center and a corner)

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