The investigation of wetdeck slamming phenomenon is a challenging Fluid-Structure Interaction (FSI) problem for both experimental and numerical analysis, requiring detailed design and structural assessment of the physical model. The focus of this paper is to document the design approach and the testing effort devoted to provide a reliable and well identified physical model before the towingtank tests were carried out for giving key insights into the wetdeck load and responses as well as an FSI validation dataset for numerical solvers. Thus, one of the main objectives is reducing the uncertainty linked to the modeling of the multi-hull structure by performing a series of both static and dynamic characterization tests on the as built catamaran model. The insight gained from this test campaign will be used to update the structural models coupled within the FSI solvers to increase the accuracy of the predicted hydrodynamic loading. Among FSI problems still receiving positive attention in ship and offshore engineering, the accurate prediction of complex loading and responses on multi-hull vessels is particularly demanding, since it involves two-way coupling of the deck structure with the flow impinging on it. Currently, there is a gap in available experimental FSI data related to this problem that can be used for numerical solver validation. Current FSI data sets are severely limited by the uncertainties associated with the experimental setups. Furthermore, though segmented model tests have become more feasible and popular for monohulls, not many experimental campaigns (Hermundstad et al. 1995, Kyyro & Hakala 1997, Cheng, F. 1997) exist for segmented catamarans that provide both global and local loads and hull responses. The only systematic investigation on elastically scaled catamarans was carried out by Lavroff et al. (2007, 2013). Dessi et al. (2016) have already illustrated the preliminary experimental results on an elastically scaled model of a SWATH aimed to accurately depict the wave loading and structural response from seakeeping tests. In the present paper the focus is instead on the structural tests performed for the physical model qualification with an extended account of the dry and wet vibration mode identification of the entire catamaran.

Progress in the Analysis and Design of Marine Structures : Proceedings of the 6th International Conference on Marine Structures (MARSTRUCT 2017), May 8-10, 2017, Lisbon, Portugal

Noise sources and hazardous noise levels on fishing vessels: The case of Newfoundland and Labrador's fleet

Characterization of resilient mounts for marine diesel engines: Prediction of static response via nonlinear analysis and response surface methodology

Foundations of Engineering Acoustics, Frank Fahy. Academic Press, London (2001), 443pp. £39.95 Hardback, ISBN: 0-12-247665-4

Vibration analysis of super-yachts: Validation of the Holden Method and estimation of the structural damping

In this paper, authors show the implementation to a real case of the single point method for the prediction of the structure-borne noise levels released by a resilient mounted diesel engine to the ship structures. The evaluation of the structure-borne noise is based on the source velocity levels measured at the diesel engine feet during the test run, on the resilient mounting impedance obtained by specific laboratory tests, and on the mobility levels of the diesel engine seating measured when the ship is under construction and the diesel engine not yet installed. The outcomes of the prediction analysis are compared with the structure-borne noise levels measured on board the ship, and overall methodology is deeply discussed in order to highlight pros and cons.

Prediction of the structure-borne noise due to marine diesel engines on board cruise ships

................................................................................................. vii Nomenclature ......................................................................................... xv List of Figures ....................................................................................... xix List of Tables....................................................................................... xxv

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Pedro Nicolas

Papers

Prediction of the structure-borne noise due to marine diesel engines on board cruise ships

Experimental study and numerical simulation of the behaviour of viscoelastic materials to reduce the vibrations on board ships