Accession Number : ADA136679

Title :   Flow-Induced Vibrations of Taut Marine Cables with Attached Masses.

Descriptive Note : Final rept. Oct 81-Sep 83,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Griffin,O M ; Vandiver,J K

PDF Url : ADA136679

Report Date : Nov 1983

Pagination or Media Count : 136

Abstract : A series of cable strumming field experiments were conducted at Castine Bay, Maine. The test site, instrumentation, cable, and experimental procedures are described in detail. The purpose of this test series was to provide an accurate data base for the validation of the computer code NATFREQ which was developed at the California Institute of Technology for the Naval Civil Engineering Laboratory to predict the natural frequencies and mode shapes for taut cable systems subjected to flow-induced vibration. In addition, the drag amplification model developed at the Naval Research Laboratory has been included in the NATFREQ code for the prediction of amplified drag coefficients for strumming cables. The predicted natural frequencies and drag coefficients obtained from a NATFREQ analysis of the Castine Bay Experimental series were compared to the measured values. Good correlation between the predicted and measured values has been obtained. A detailed description of these comparisons and the NATFREO code is provided.

Descriptors :   *Mechanical cables, *Strumming, *Vibration, *Resonant frequency, Computer programs, Tensile properties, Drag, Coefficients, Hydrodynamic characteristics, Water flow, Vortex shedding, Mass, Load distribution, Mathematical prediction, Excitation, Cables, Oscillation, Fluid dynamics, Data bases, Validation, Experimental data, Marine engineering, Test facilities, Data acquisition

Subject Categories : Marine Engineering
      Acoustics
      Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE