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Wet Vibration of Low-Aspect-Ratio Aerofoil Wing: Semi-Analytical and Numerical Approach With Experimental Investigation

[+] Author Affiliations
N. Datta, Y. Verma

Indian Institute of Technology, Kharagpur, India

A. N. Kannamwar

Oceanergy, Mumbai, India

Paper No. OMAE2017-62497, pp. V03BT02A036; 10 pages
doi:10.1115/OMAE2017-62497
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3B: Structures, Safety and Reliability
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5766-3
  • Copyright © 2017 by ASME

abstract

The free wet vibration characteristics of an idealized low-aspect-ratio cantilever wing are studied semi-analytically, numerically, and experimentally. The wing is modeled as a tapered, hollow Kirchhoff’s plate, with the chord-wise section as a symmetrical NACA0018 aerofoil. The chord length tapers from root to tip, over the span. The main aim is to set up a suitable radiation boundary problem for the vibrating cantilever wing, in order to semi-analytically generate the wet frequencies. The efficacy of the semi-analytical wet vibration approach is studied by comparing it with the other two approaches. The difficulties encountered are due to the hollow two-way tapered shape of the wing and the free edge boundary conditions on its three sides. The semi-analytical approach is based on Galerkin’s method, which includes the modal superposition of two orthogonal beam modeshapes (Free-Free beam in chord-wise and cantilever in span-wise directions). The plate modeshapes thus generated are further used in the 3D source distribution technique to calculate the fluid inertia, leading to a consistent drop in the natural frequencies. The cantilever wing has been fabricated and tested in-house. The underwater impact hammer test generates the wet natural frequencies. The free vibration frequencies are also verified numerically using ANSYS, and compared with experimental studies.

Copyright © 2017 by ASME
Topics: Vibration , Wings , Airfoils

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