The use of impulse response functions for evaluation of added mass and damping coefficient of a circular cylinder oscillating in linearly stratified fluid |
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Authors: | E V Ermanyuk |
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Institution: | (1) Lavrentyev Institute of Hydrodynamics Siberian Division of Russian Academy of Science Av. Lavrentyev 15, Novosibirsk, 630090, Russia, E-mail: ermanyuk@hydro.nsc.ru, RU |
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Abstract: | The damped horizontal oscillations of a circular cylinder in linearly stratified fluid are studied experimentally. The cylinder
is fixed to the lower end of a physical pendulum with variable restoring moment. The impulse response function of the pendulum
in time domain is recorded and converted to the frequency response function using Fourier transform. The density stratification
is shown to have a strong effect on frequency-dependent hydrodynamic coefficients (added mass and damping). The data obtained
are compared with available theoretical predictions. The applicability of a simplicistic method implying approximation of
impulse response functions by analytical functions is discussed.
Received: 15 September 1998/Accepted: 1 April 1999 |
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Keywords: | |
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