SHIP HULL VIBRATIONS - 5. ANALYSIS OF HULL STRUCTURES AS APPLIED TO SSB(N) 598 GEORGE WASHINGTON
Abstract
A computer program for determining the natural frequency of a ship hull elastically connected to other elastic systems and to sprung masses and containing concentrated and hysteresis damping is developed. This program is applied to the mass-elastic system that represents the SSB(N) 598 George Washington in detail. The influence upon the hull response to propeller and hull excitation in the stern of variables such as the number of mass points used to represent the hull, the omission of the propulsion sub system, the stiffness between the propulsion sub-system and the primary hull, the inclusion of the moment of inertia of the hull cross-sections, the treatment of water inertias, the treatment of sprung masses and the amount of hysteresis damping in the hull is shown. A computing machine program that is sufficiently flexible to deal with parallel sub-systems, sprung masses and concentrated and hysteresis damping in axial ending vibration has been developed. The mass elastic characteristics of the SSB(N) 598 George Washington have been determined in considerable detail. The effects of various approximations such as omitting the propulsion sub-system, treating sprung masses as rigidly connected, neglecting rotary inertia, representing the hull with a limited number of mass points, spacing the mass points uniformly have been investigated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1963
- Accession Number
- AD0407152
Entities
People
- Elizabeth Cuthill
- F. E. Reed