Accession Number : AD0435061


Title :   A STUDY IN UNDERWATER FLUTTER,


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB


Personal Author(s) : Sevik,M ; Ackerman,C T


Report Date : 03 Jan 1964


Pagination or Media Count : 81


Abstract : The possibility of bending torsional flutter on a typical underwater vehicle has been analyzed theoretically. The mathematical model chosen consisted of a thin-walled ellipsoid of revolution and a control surface attached to its aft end. The first three bending modes of the hull and one torsional mode of the control surface have been included in the analysis. The onset of flutter has been calculated and the results have been presented in parametric form. In addition, certain water tunnel experiments performed on a hydroelastic model are reported. These gave an indication of the magnitude of spontaneous excitations of the control surface and the hull at velocities below the flutter speed. An estimate of the magnitude of these hydrodynamic disturbances is given. (Author)


Descriptors :   *VEHICLES , *UNDERWATER OBJECTS , *FLUTTER , *AEROELASTICITY , UNDERWATER , MATHEMATICAL MODELS , COMPUTER PROGRAMMING , HYDROFOILS , ELLIPSOIDS , HULLS(MARINE) , CONTROL SURFACES , HYDRAULIC MODELS , VIBRATION , MOTION


Distribution Statement : APPROVED FOR PUBLIC RELEASE