Accession Number : ADB076808

Title :   Measurement of Full-Scale Current-Induced Forces and Yaw Moments on a Destroyer.

Descriptive Note : Final rept. Jan 82-Jan 83,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Palo,Paul A.

Report Date : APR 1983

Pagination or Media Count : 63

Abstract : This report summarizes full-scale tests on the current-induced forces and yaw moments on two World War II destroyers. The vessels were moored in the open ocean with bow and stern lines, and measurements were taken of the mooring line tensions under various wind, wave, and current excitations at different angles of attack. The resulting current load data were analyzed using three independent methods and are considered reliable. Analysis of the data shows that the stern appendages had a large effect on the total loads, which would be increased if propellers had been present. The data are the first known reliable data for the validation of state-of-the-art current load methodologies. An estimate was also made of asymptotic fouling resistance, which is the first known. Measured wind loads are also compared to expected values. Because the resulting data apply only to a single, badly fouled destroyer without propellers excited by low (up to 0.4 knot) currents in deep water, it is necessary that further current load testing be performed to adequately validate state-of-the-art methods of calculating current-induced loads for arbitrary vessels and water depths. (Author)

Descriptors :   *MOORING, HYDROMECHANICS, OCEAN CURRENTS, DYNAMIC LOADS, SEA TESTING, WIND, DESTROYERS, YAW, FLOATING BODIES, FOULING, SHIP HULLS, LOAD DISTRIBUTION, SHIP STERNS, DRAG, SKIN FRICTION, MOMENTS, MEASUREMENT, DATA ACQUISITION, MARINE ENGINEERING

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE