This work discusses procedures used to determine effective shear area of ship sections. Five types of ships have been studied. Initially, the vertical natural frequencies of an acrylic scale model 3m in length in a laboratory at university are obtained from experimental tests and from a three dimensional numerical model, and are compared to those calculated from a one dimensional model which the effective shear area was calculated by a practical computational method based on thin-walled section Shear Flow Theory. The second studied ship was a ship employed in midshipmen training. Two models were made to complement some studies and vibration measurements made for those ships in the end of 1980 decade when some vibration problems in them were solved as a result of that effort. Comparisons were made between natural frequencies obtained experimentally, numerically from a three dimensional finite element model and from a one dimensional model in which effective shear area is considered. The third and fourth were, respectively, a tanker ship and an AHTS (Anchor Handling Tug Supply) boat, both with comparison between three and one dimensional models results out of water. Experimental tests had been performed in these two ships and their results were used in other comparison made after the inclusion of another important effect that acts simultaneously: the added mass. Finally, natural frequencies experimental and numerical results of a barge are presented. The natural frequencies numerical results of vertical hull vibration obtained from these approximations of effective shear areas for the five ships are finally discussed.
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ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
June 9–14, 2013
Nantes, France
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5533-1
PROCEEDINGS PAPER
Effective Shear Area in One Dimensional Ship Hull Finite Element Models to Predict Natural Frequencies of Vibration Available to Purchase
Osvaldo Pinheiro de Souza e Silva,
Osvaldo Pinheiro de Souza e Silva
CIAGA, Rio de Janeiro, RJ, Brazil
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Severino Fonseca da Silva Neto,
Severino Fonseca da Silva Neto
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Ilson Paranhos Pasqualino,
Ilson Paranhos Pasqualino
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Antonio Carlos Ramos Troyman
Antonio Carlos Ramos Troyman
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Osvaldo Pinheiro de Souza e Silva
CIAGA, Rio de Janeiro, RJ, Brazil
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Severino Fonseca da Silva Neto
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Ilson Paranhos Pasqualino
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Antonio Carlos Ramos Troyman
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2013-11463, V02BT02A043; 10 pages
Published Online:
November 26, 2013
Citation
de Souza e Silva, OP, da Silva Neto, SF, Pasqualino, IP, & Troyman, ACR. "Effective Shear Area in One Dimensional Ship Hull Finite Element Models to Predict Natural Frequencies of Vibration." Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 2B: Structures, Safety and Reliability. Nantes, France. June 9–14, 2013. V02BT02A043. ASME. https://doi.org/10.1115/OMAE2013-11463
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