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Accession Number:
AD0610138
Title:
RECENT DEVELOPMENTS IN THE THEORY OF SHIP VIBRATION
Corporate Author:
DAVID TAYLOR MODEL BASIN WASHINGTON DC
Report Date:
1953-10-01
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.
Supplementary Note:
Supersedes rept. dtd. Feb 1951, ATI-194518.
Pages:
0056
Distribution Statement:
Approved for public release; distribution is unlimited.
File Size:
2.87MB
