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TECHNICAL PAPERS

Reduction of Noise Transmission in a Duct by Termination Impedance Control of a Sidebranch Resonator

[+] Author and Article Information
M. Utsumi

Machine Element Department, Technical Research Laboratory, Ishikawajima-Harima Heavy Industries Company Ltd. (IHI), 3-1-15 Toyosu, Koto-ku, Tokyo 135-8732, Japan

J. Vib. Acoust 123(3), 289-296 (Jan 01, 2001) (8 pages) doi:10.1115/1.1368118 History: Received December 01, 1999; Revised January 01, 2001
Copyright © 2001 by ASME
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References

Figures

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Function h1(t) (ε→0)
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Comparison between desired and implemented controller transfer functions (–, desired; •, implemented; L=0.2237 m,A1=0.00785 m2,m=1, ρ=1.2 kg/m3 , c=340 m/s,M=0.05 kg,C=0.2513 Ns/m,K=789.6 N/m,ζn=0.005,n̄=4,Δt=0.02 msec; a damping ratio of 0.005 is used as the damping effect of the system)
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Transmission loss (parameters are the same as in Fig. 3; –, present control method; [[dotted_line]], passive control method)
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Transmission loss for smaller cross-sectional area of the sidebranch resonator (m=0.6 and the other parameters are the same as in Fig. 3; –, present control method; [[dotted_line]], passive control method)
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Transmission loss for longer sidebranch resonator (L=0.3036 m,n̄=5, and the other parameters are the same as in Fig. 3; –, present control method; [[dotted_line]], passive control method)
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Transmission loss for echoic duct end (L=0.2237 m and the other parameters are the same as in Fig. 3; –, present control method; [[dotted_line]], passive control method)
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Comparison between noise attenuation obtained by the present and traditional algorithms [parameters are the same as in Fig. 3;    , present; –, traditional (μ=60)]
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Comparison between gains of the control forces required for the proposed and feedforward controllers [parameters are the same as in Fig. 3;    , proposed; –, feedforward (Ls=0.2237 m,m=1)]
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Transmission loss obtained by the conventional feedforward controller [Ls=0.2237 m,m=1, and the other parameters are the same as in Fig. 3;    , anechoic duct end; –, echoic duct end (L=0.2237 m)]
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Conventional feedforward controller with an upstream sensor

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