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TRANSVERSE HYDRODYNAMIC FORCES ACTING ON TOWED VIBRATING CYLINDERS

Measurements of transverse forces acting on oscillating cylinders towed at constant speeds were made and the results used in the response analyses of cylinders. The responses of spring supported cylinders and simply supported flexible cylinders were calculated. The calculated responses of the cylinders showed good agreements with the experimental results. The experiments were systematically conducted changing the combination of four parameters, oscillation amplitude, towing speed, oscillation frequency and cylinder length. A large number of the experiments were conducted and transverse forces and phase differences between oscillation and lift forces were arranged as functions of the four parameters. When the oscillating amplitude is small, the frequency of lift force is governed by the Strouhal number. The oscillating frequency began to dominate the frequency of the transverse force as the oscillating amplitude increased. When the oscillating frequency comes close to the Strauhal frequency, the frequency of the lift force is controlled by the oscillating frequency and the correlation length increases. The correlation length does not increase when the oscillating frequency is distant from the Strauhal frequency. The phase angle, which determines the energy exchange between the fluid and the oscillating cylinder, is changed by 180 degrees as the oscillating frequency coincides with the Strouhal frequency.

  • Supplemental Notes:
    • Soc Naval Arch Japan J, v 170, Dec 1991, p 265 [11 p, 14 ref, 25 fig]
  • Authors:
    • Suzucki, H
    • Asato, T
    • Yoshida, K
  • Publication Date: 1991

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00703335
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM