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TECHNICAL PAPERS

The Impact of Moments Near Discontinuities in Structural-Acoustic Systems

[+] Author and Article Information
W. Steve Shepard

Department of Mechanical Engineering, The University of Alabama, Box 870276, Tuscaloosa, AL 35487

J. Vib. Acoust 125(2), 137-144 (Apr 01, 2003) (8 pages) doi:10.1115/1.1553470 History: Received April 01, 2001; Revised October 01, 2002; Online April 01, 2003
Copyright © 2003 by ASME
Topics: Force , Fluids , Acoustics , Modeling
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References

Figures

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Example vibration-isolation system
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Moments induced by lateral vibrations
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Structural-acoustic system containing distributed mass discontinuity
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Locally reacting distributed mass discontinuity of width ΔD located at ξ=ξo
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Harmonic excitations, (a) line-force at ξ=ξF, and (b) line-moment at ξ=ξM
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Moment eccentricity, g/a, required to produce a ±3 dB change in radiated power. Force and moment excitation. No discontinuities
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Moment eccentricity, g/a, required to produce a ±3 dB change in radiated power. Force and moment excitation. Distributed mass discontinuity, mrat=0.25, centered at ξo=−0.20, and distributed over ΔD=0.10
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Change in radiated acoustic power from pure force due to addition of moment with eccentricity of g/a=0.04 and mass with mrat=0.5 at ξo=−0.2 and ΔD=0.10
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Change in radiated acoustic power from pure force due to addition of moment with eccentricity of g/a=0.08 and mass with mrat=0.5 at ξo=−0.2 and ΔD=0.10
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Change in radiated acoustic power from pure force due to addition of moment with eccentricity of g/a=0.04 and mass with mrat=0.5 at ξo=−0.067 and ΔD=0.05
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Change in radiated acoustic power from pure force due to addition of moment with eccentricity of g/a=−0.04 (180° phase) and mass with mrat=0.5 at ξo=−0.2 and ΔD=0.10
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Change in radiated acoustic power from pure force due to addition of moment with eccentricity of g/a=0.04i (90° phase) and mass with mrat=0.5 at ξo=−0.2 and ΔD=0.10

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