Accession Number : AD0622562

Title :   RUDDER-HULL VIBRATION AND FLUTTER ANALYSIS OF A HIGH-SPEED SHIP (PGM MOTOR GUNBOAT),

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C ACOUSTICS AND VIBRATION LAB

Personal Author(s) : Leibowitz,Ralph C.

Report Date : OCT 1965

Pagination or Media Count : 210

Abstract : This report presents the results of a 'flutter' analysis for a PGM Motor Gunboat. The results were obtained both by computing the rudder-hull vibrations (including flutter) on an analog computer and by numerical analysis. The analogs are based upon extensions of previously derived theories and methods for representing the vibrating system excited by hydrodynamic forces and for evaluating the rudder-hull structural and hydroelastic parameters and hydrodynamic parameters referenced in this report. The results indicate that (assuming a minimum conceivable value of damping) for the PSM rudder-hull system, controlsurface flutter will occur at approximately 90 knots. Moreover, the flutter characteristics of the entire rudder-hull system are more complex than classical flutter of simpler systems involving two vibration modes; hence conclusions concerning the classical or binary flutter of a two- or three-degree-of-freedom rudder do not apply to the entire rudder-hull combination. (Author)

Descriptors :   (*FLUTTER, NAVAL VESSELS), (*HULLS(MARINE), FLUTTER), (*MARINE RUDDERS, FLUTTER), SHIP HULLS, VIBRATION, FLUID DYNAMICS, NUMERICAL ANALYSIS, ANALOG COMPUTERS, CONTROL SURFACES, HYDRODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE