Abstract
Ship hydroelastic vibration is an issue involving mutual interactions among inertial, hydrodynamic, and elastic forces. The conventional laboratory tests for wave-induced hydroelastic vibrations of ships are performed in tank conditions. An alternative approach to the conventional laboratory basin measurement, proposed in this paper, is to perform tests by large-scale model measurement in real sea waves. In order to perform this kind of novel experimental measurement, a large-scale free running model and the experiment scheme are proposed and introduced. The proposed testing methodology is quite general and applicable to a wide range of ship hydrodynamic experimental research. The testing procedure is presented by illustrating a 5-hour voyage trial of the large-scale model carried out at Huludao harbor of China in August 2015. Hammer tests were performed to identify the natural frequencies of the ship model at the beginning of the tests. Then a series of tests under different sailing conditions were carried out to investigate the vibrational characteristics of the model. As a postvoyage analysis, load, pressure, acceleration, and motion responses of the model are studied with respect to different time durations based on the measured data.
Highlights
In the recent decades, ships have become larger and faster due to the world globalization and the development requirements
It is worth mentioning that the horizontal bending moment (HBM) loads are nearly as large as vertical bending moment (VBM) loads when the ship is sailing in severe oblique waves
This paper presents a novel measurement technique for wave-induced hydroelastic vibrations of large elastic ships in natural environment
Summary
Ships have become larger and faster due to the world globalization and the development requirements. There are two different kinds of models for performing tests for hydroelastic vibrational responses: monoblock model and segmented model [5, 6] In the former model, a material of proper Young modulus which is much smaller than steel and of the same Poisson ratio as steel is used to build the model hull in order to make the stiffness of model similar to ship prototype [7]. The latter model, that is, segmented model, is connected by a continuous compliant backbone, from which the sectional loads and vibrations responses of the model hull can be measured [8]. The latter testing approach is a more popular choice compared with the former
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