Use of added mass and shear flow in thin-walled sections of ships for modal analysis using finite element method

Autor: Ulisses A. Monteiro, Ricardo H. R. Gutiérrez, B. G. Haro, Antonio Carlos Ramos Troyman, L. A. Vaz, S. F. SilvaNeto
Rok vydání: 2018
Předmět:
Zdroj: Marine Systems & Ocean Technology. 13:43-54
ISSN: 2199-4749
1679-396X
DOI: 10.1007/s40868-018-0044-8
Popis: At new ships’ design stages, an important requirement is to grant the structure safety to give to the shipowner and the crew a greater tranquility during ships’ operation. In this scenario, it is relevant to make vibration analysis to identify possible resonance conditions between the structure and the main excitation sources. To trustly predict the ship’s natural frequencies, it is necessary to use a methodology which involves the model to confidently represent the structure and its interaction with the fluid medium. A 3D model that takes into account all the elements with relevance in the calculation of the vertical natural frequencies was developed. To achieve a simpler modeling and short computational effort, a 1D model based on Timoshenko’s beam and thin-walled beam shear flow theories was also developed. Additionaly, the added mass effects were considered using several methods. The methodology was verified with experimental results obtained for a Panamax type ship from which vibration data was acquired during a sea trial. The results showed that both models confidently represent the structure in the vertical vibration analyses, but the computational effort in 1D model is much smaller than that required by the 3D model.
Databáze: OpenAIRE
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