RECENT DEVELOPMENTS IN THE THEORY OF SHIP VIBRATION
Abstract
It is shown in this report that by considering the ship hull as a floating beam having shearing and bending flexibility with a distributed viscous damping proportional to mass it is possible to derive equations of motion under external forces by the general Rayleigh method which yields a solution in terms of normal modes of motion. Practical methods of determining natural frequencies and normal modes are discussed, and it is shown that solutions based on finite- difference equations can be obtained with the use either of a digital sequence calculator or an electrical analog. A discussion is given of coupled horizontal bending and torsional modes as well as vertical modes of vibration. It is pointed out that the finite-difference-equation method applied to vertical vibration of a vessel of merchant type has given results in good agreement with experimental values up to the sixth vertical mode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1953
- Accession Number
- AD0610138
Entities
People
- A. N. Gleyzal
- G. K. Hess Jr.
- R. L. Hess
- R. T. Mcgoldrick