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 in level are recorded on the portion of the hydrofoil isolated from the leading edge.
Hydrofoil Leading Edge Isolation for Vibration and Noise Reduction in Marine Systems
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Brungart, T. A., Myer, E. C., Capone, D. E., Campbell, R. L., and Petrie, H. L. (July 5, 2006). "Hydrofoil Leading Edge Isolation for Vibration and Noise Reduction in Marine Systems." ASME. J. Vib. Acoust. December 2006; 128(6): 772–777. https://doi.org/10.1115/1.2346697
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