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Abstract
Modelling of ship structures in a virtual environment is now standard practice. Unfortunately, many engineers forget to consideri the influence of added water on the frequency values and the amplitude of natural vibrations. The article presents the effect of water damping on the frequency values of the individual natural vibration modes. The tests were carried out in two stages. First, the mentioned values were determined using FEM and then the values obtained in this way were compared with the parameters measured during laboratory tests. For the needs of laboratory measurements, structural elements made of ship steel in one of the Polish shipyards were used. All welds of the test objects have been verified in terms of their correctness. Irregularities in the execution of welded joints could result in a measurement error that is difficult to identify. As a result of the tests, the percentage differences in the frequency of occurrence of natural vibrations of individual modes were determined according to added water mass considerations. Importantly, the research concerned a real structural element of the hull, and the results obtained confirm the need to take into account the mass of accompanying water during the hull's FEM analysis. A number of more detailed research results were obtained, the most important of which is the fact that the finite element method is a valuable method for assessing the dynamics of wetted structures: the error in determining the vibration frequency did not exceed 5% for basic modes. The method of modelling the tested structures was almost equally important: the discrepancy of the results reached 4% depending on the modelling method. When designing marine SHM systems, it is essential to consider the effect of added water mass, since the frequency variations of a damaged structure, in relation to an undamaged one, are of the same order as the effect of added water.
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Authors (8)
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Do Van Doan
- Vietnam Maritime University
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Lech Murawski
- Gdynia Maritime University
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Adam Szeleziński
- Gdynia Maritime University
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Tomasz Muchowski
- Gdynia Maritime University
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Marcin Kluczyk
- Polish Naval Academy of the Heroes of Westerplatte
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Adam Muc
- Gdynia Maritime University
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Krzysztof Jasiński
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.26408/128.04
- License
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Scientific Journal of Gdynia Maritime University
no. 128,
pages 57 - 77,
ISSN: 2657-5841 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Van Doan D., Murawski L., Szeleziński A., Muchowski T., Kluczyk M., Muc A., Jasiński K., Chodnicki M.: Influence of Added Water Mass on Ship Structure Vibration Parameters in Virtual and Real Conditions// Scientific Journal of Gdynia Maritime University -,iss. 128/23 (2023), s.57-77
- DOI:
- Digital Object Identifier (open in new tab) 10.26408/128.04
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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