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TECHNICAL PAPERS

Hydrofoil Leading Edge Isolation for Vibration and Noise Reduction in Marine Systems

[+] Author and Article Information
Timothy A. Brungart

 The Pennsylvania State University, Applied Research Laboratory, PO Box 30, State College, PA 16804-0030tab7@only.arl.psu.edu

Eric C. Myer, Dean E. Capone, Robert L. Campbell, Howard L. Petrie

 The Pennsylvania State University, Applied Research Laboratory, PO Box 30, State College, PA 16804-0030

J. Vib. Acoust 128(6), 772-777 (Jul 05, 2006) (6 pages) doi:10.1115/1.2346697 History: Received January 27, 2006; Revised July 05, 2006

A technique for reducing the vibration and noise from hydrofoils subject to unsteady lift is examined experimentally. Since the unsteady lift is known to be concentrated in the leading edge vicinity, a single-stage vibration isolation mount is integrated into a hydrofoil near its leading edge to inhibit the leading edge-generated unsteady forces from being transmitted to the remainder of the foil and any structures coupled to it. A single layer of elastomer forms the mount and is used to isolate the leading 20% chord of the hydrofoil from the remainder of the structure. The hydrofoil is excited into vibration by turbulence from an upstream wake generator in a water tunnel facility. Compared to a nonisolated hydrofoil, vibration reductions up to 10dB in level are recorded on the portion of the hydrofoil isolated from the leading edge.

FIGURES IN THIS ARTICLE
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Copyright © 2006 by American Society of Mechanical Engineers
Topics: Vibration , Hydrofoil , Wakes
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References

Figures

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Figure 1

Airfoil chord-wise unsteady pressure distribution according to Eq. 1

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Figure 2

Overall unsteady lift reduction possible with leading edge isolation

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Figure 3

Schematic of test hydrofoil with isolated leading edge

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Figure 4

Schematic of experimental setup

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Figure 5

Single-input/single-output model of test hydrofoil vibration measurements

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Figure 6

Vertical variation of axial and spanwise velocity statistics measured 3.2mm upstream from the test hydrofoil’s leading edge

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Figure 7

Frequency spectra of the axial and spanwise velocity fluctuations measured on tunnel centerline and 3.2mm upstream from the test hydrofoil’s leading edge

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Figure 8

Vibration spectra measured on isolated portion of test hydrofoil at 7.6m∕s

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Figure 9

Surface-averaged vibration spectra for isolated portion of test hydrofoil at 7.6m∕s

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Figure 10

Vibration spectra measured on leading edge of test hydrofoil at 7.6m∕s

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