Abstract
The hydroelastic behaviour of a river-sea-going ship hull is analysed experimentally and numerically. A segmented ship model connected by a steel backbone is tested in regular waves, and its high-frequency vibrations such as springing and whipping responses are identified. The hydroelastic response of the ship is numerically calculated using a hydroelastic time domain method based on strip theory, which is extended to include an improved model of the slamming load. The slamming forces in the bow section are determined using the Modified Longvinovich Model (MLM) instead of the Von Karman model. The vertical motions and wave-induced loads are calculated and compared with the experimental results. The response amplitude operators of the vertical loads and the high-order harmonics are analysed under different speeds, showing good agreement with the experiments. The slamming loads on the bow section of a river-to-sea ship are predicted utilizing the MLM model and compared with the Arbitrary Lagrangian Eulerian algorithm by LS-DYNA and with the measured results.
Highlights
Ship vibration is an important type of response effect for comfort on board and for ship strength
Wave-induced ship hull vibration can be the result of the transient response to slamming loads [1] or the hydroelastic behaviour of the ship hull [2], referred to as whipping and springing respectively, both of which are essential for the consideration of structural safety and integrity
A scaled model (1:32) of the river-sea-going ship was constructed with FRP (Fiberglass Reinforced Plastics) that was divided into four segments connected with a U-shaped section backbone in order to reproduce the effect of the deformation modes on the loads
Summary
Ship vibration is an important type of response effect for comfort on board and for ship strength. The numerical simulations were validated in the prediction of the wave-induced loads on an FPSO (Floating Production Storage and Offloading) platform [12] This code was extended by accounting for body nonlinear boundary conditions [13] and for second-order Froude–Krylov pressure [14]. The objective of this paper is to investigate the results of this experimental programme to study the hydroelastic effects on the vertical responses of a river-sea-going ship and to compare them with numerical predictions. The slamming pressure calculated by the MLM model is compared with LS-DYNA results and with the measured values from the experiments to validate the extended nonlinear hydroelastic time domain method. A comparison of the numerical results and measurements is illustrated in order to evaluate the springing responses and their effects on the vertical responses
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