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Local hydroelastic response of ship structures under impact loads from water (slamming)

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  • Local hydroelastic response of ship structures under impact loads from water (slamming)

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  • A. Bereznitski (Netherlands)

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Date issued: 24 March 2003

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Dublin Core Type: Text

  • Abstract

    Accurate prediction of representative design loads and, hence, the structural response is the key factor in performing successful design of marine structures. In most cases these design loads can be determined separately from the structural analysis and then applied to the structure in order to find the structural response. However, in some cases these loads are dependent on the structural response. In that case hydroelastic interaction takes place.
    The challenge of hydroelastic problems consists of combining two areas of science: hydromechanics and structural strength. In spite of the tact that hydroelasticity has become very popular in the last years and many researches pay a lot of attention to this subject the role of hydroelasticity is not well understood in the many practical problems. The question "Should hydroelasticity be considered or can it be neglected?" still exists in many areas of science where the fluid-structure interaction takes place.
    The primary goal of this thesis is achievement of better understanding of the physics of hydroelasticity for slamming problem. Expansion of knowledge in this area will lead. to better prediction of the hydrodynamic loads and the structural response. This will help to improve the ship design and to make sea transportation more safe and more economically attractive. The ability to design highly optimized structures will decrease the structural weight reducing the usage of materials. The speed and load carrying capacity of ship will be improved.
    A number of numerical models are discussed in this thesis incorporating different approaches and theories. The effect of hydroelasticity is studied by considering various factors that influence the slamming problem. These factors are among others structural flexibility, entrapped air, speed of impact, and deadrise angle. In order to verify the conclusions based on numerical results, available experimental data were considered. Advanced numerical models were created to simulate these experiments. Good agreement between numerical prediction and available experimental data is found.
    General conclusions are drawn with respect to those factors which make the effect of hydroelasticity important. 8ased on detailed analysis of all numerical results the author suggests a special parameter, which can indicate the importance of hydroelasticity in each particular case. This parameter is the ratio between the duration of slamming impact and the first period of natural vibration of a dry structure. The author recommends to use this parameter in ship design.

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  • TU Delft library (Netherlands):

Created on

10 September 2013 at 14:54

Last modified on

20 December 2016 at 11:30

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