A comparative study of the dynamic behaviour of a fast patrol boat travelling in rough seas

Aksu, S; Price, W.G.; Suhrbier, Klaus; Temarel, P.

doi:10.1016/0951-8339(93)90030-7

Cited by 14 publications

(6 citation statements)

References 3 publications

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“…However, there is considerable uncertainty over the safety factors required for this loading despite several measurement campaigns for different vessels (e.g. [5][6][7]). The slamming pulse is very short, typically lasting tens of milli-seconds, so special equipment is needed to record it and to correlate the recording with navigation conditions.…”

Section: Introductionmentioning

confidence: 99%

Improved impact performance of marine sandwich panels using through-thickness reinforcement: Experimental results

Baral¹,

Cartié²,

Partridge³

et al. 2010

Composites Part B: Engineering

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This paper presents results from a test developed to simulate the water impact (slamming) loading of sandwich boat structures. A weighted elastomer ball is dropped from increasing heights onto rigidly supported panels until damage is detected. Results from this test indicate that honeycomb core sandwich panels, the most widely used material for racing yacht hulls, start to damage due to core crushing at impact energies around 550 J. Sandwich panels of the same areal weight and with the same carbon/epoxy facings but using a novel foam core reinforced in the thickness direction with pultruded carbon fibre pins, do not show signs of damage until above 1200 J impact energy. This suggests that these will offer significantly improved resistance to wave impact. Quasi-static test results cannot be used to predict impact resistance here as the crush strength of the pinned foam is more sensitive to loading rate than that of the honeycomb core.

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Section: Introductionmentioning

confidence: 99%

Improved impact performance of marine sandwich panels using through-thickness reinforcement: Experimental results

Baral¹,

Cartié²,

Partridge³

et al. 2010

Composites Part B: Engineering

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“…Work has also been developed to study mono-hulled vessels, such as aircraft carriers, without port/starboard symmetry [8]. The 2D hydroelasticity theory was extended to evaluate response owing to bow impact forces due to slamming in regular and irregular waves [3,4] and the potential applicability of the approach was confirmed through comparisons with full-scale measurements [9,10]. In the same vain Guedes Soares [11] also applied a linear strip theory for relative motions between ship Fig.…”

Section: Introductionmentioning

confidence: 99%

“…One should also bear in mind the planning hull form and the associated limitations imposed by the use of a mean wetted surface and omission of hydrodynamic lift when planing. Regarding the theme of the present study the work by Aksu et al [10] on a 52 m steel FPB (length/ beam 5 7) travelling in regular and irregular waves, including the effects of bottom slamming is of interest. Aksu et al [10] showed good agreement between numerical results predicted using 2D hydroelasticity and full-scale measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the theme of the present study the work by Aksu et al [10] on a 52 m steel FPB (length/ beam 5 7) travelling in regular and irregular waves, including the effects of bottom slamming is of interest. Aksu et al [10] showed good agreement between numerical results predicted using 2D hydroelasticity and full-scale measurements. The minehunter investigated by Price et al [16] is also of interest as it has length/beam and length/depth ratios of 4.7 and 9.3, respectively, and is made of composite material.…”

Section: Introductionmentioning

confidence: 99%

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On the limitations of two- and three-dimensional linear hydroelasticity analyses applied to a fast patrol boat

Santos

Temarel

Soares

2009

Proceedings of the Institution of Mechanical Engineers, Part M:

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The aim of this paper is to study the symmetric (i.e. heave and pitch motions and distortions associated with vertical bending) wave-induced dynamic behaviour of a fast patrol boat using a unified hydroelasticity analysis. This includes two- and three-dimensional structural idealizations using beam and three-dimensional finite element modelling. The fluid—flexible structure interaction is carried out using three-dimensional potential flow analysis, for both structural idealizations, based on a pulsating source singularity distribution on the mean wetted surface. The calculations are carried out in regular waves for two forward speeds (Froude numbers Fn = 0.5 and 0.63) and three heading angles, i.e. 180 (head), 135, and 90 degrees. Results from full-scale trials are also presented in order to compare rigid body motion transfer functions with numerical predictions. There are large differences between numerically predicted and measured motions, as is to be expected for this fast hull form. The paper reports that the evaluation of the dynamic behaviour of the fast patrol boat, with small length to beam ratio, by means of the unified hydroelastic analysis, shows some inherent limitations of the beamlike approach for this particular type of vessel.

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“…Prediction of slamming loads using vertical velocity and investigation of wet deck slamming of catamarans can be found in [11]. Hydroelastic analysis encompassing fluid-structure interactions has been successfully applied to model the behaviour of flexible high-speed patrol boats in irregular sea states [12].…”

Section: Slam Impact Experienced On Hscmentioning

confidence: 99%

Implementation of a Drop Test Impact Rig for Dynamic Testing of High Speed Craft Shock Mitigation Seats and Extraction of Modal Parameters

Alam¹

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The motivation for this work is human-factors-influenced vibration attenuation using high-speed craft (HSC) shock-mitigating seats. The high-g loads occurring at the seat-deck interface locations during slam impacts in moderate to high seas results in serious potential for injury to the occupants. Since various designs and types of shockmitigating seats are available, quantifying their shock attenuation characteristics can be challenging. The need for a standard testing platform and experimental analysis to investigate a seat's effectiveness forms the major objective of research being carried out by Carleton University's Applied Dynamics Laboratory (ADL) in partnership with Defence Research and Development Canada-Atlantic (DRDC-Atlantic).A drop tower was designed and manufactured by the ADL for testing seats in order to characterize their shock mitigating effectiveness by simulating the severe conditions of a slam impact at sea through the use of singular impact testing. Further, in order to identify the seats' dynamic parameters from drop test data, the Eigensystem Realization Algorithm (ERA), a modal-analysis-based system identification method, was applied to two commercial shock-mitigating seats provided by DRDC-Atlantic.The technique was shown to successfully extract the damping ratio as well as the damped and undamped natural frequencies of the seats from impact test data. The dynamic properties of the seats derived from the ERA can be tabulated vis-a-vis their vibration performance metrics illustrated in the thesis, which can subsequently inform decisions related to the design and/or procurement of commercial seats. ii 6.3.

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A comparative study of the dynamic behaviour of a fast patrol boat travelling in rough seas

Cited by 14 publications

References 3 publications

Improved impact performance of marine sandwich panels using through-thickness reinforcement: Experimental results

Improved impact performance of marine sandwich panels using through-thickness reinforcement: Experimental results

On the limitations of two- and three-dimensional linear hydroelasticity analyses applied to a fast patrol boat

Implementation of a Drop Test Impact Rig for Dynamic Testing of High Speed Craft Shock Mitigation Seats and Extraction of Modal Parameters

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