Wave slamming loads on wave-piercer catamarans operating at high-speed determined by hydro-elastic segmented model experiments

Lavroff, J; Davis, M. R.; Holloway, DS; Thomas, Giles

doi:10.1016/j.marstruc.2013.05.001

Cited by 53 publications

(48 citation statements)

References 7 publications

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“…The longitudinal 12 bending modes of the 86m and 96 m vessels were further identified in zero speed anchor drop tests using four 13 6 accelerometers located along the vessel centre line by Thomas et al (2003), as shown in In comparison with full-scale trials, model experiments provide a more controlled and highly instrumented and 47 regular wave slam test condition that is not possible at full-scale. In particular, model experiments make possible a 48 comprehensive investigation of extreme wave slam loads as reported by Lavroff et al (2013). It is never certain in 49 full-scale trials whether the most severe structural loading has been identified.…”

Section: Review Of Wave Slamming On Full-scale Vesselsmentioning

confidence: 99%

Wave impact loads on wave-piercing catamarans

et al. 2017

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Wave slamming is investigated for the 112 m INCAT wave-piercer catamaran with reference to experimental work conducted at full scale, numerical computation by CFD and FEA and testing at model scale using a 2.5 m segmented hydro-elastic model. The segmented model was tested in regular head seas to investigate the magnitude and location of the dynamic wave slam force and slam induced hull bending moments. The model consists of rigid segments joined by elastic hinges designed to match the scaled first longitudinal modal (whipping) frequency measured at fullscale on the INCAT 112m vessel. Effects of forward speed and wave encounter frequency on slamming and whipping were investigated. Scaled slam forces of up to 2150 tonnes weight (21.1 MN) were measured during model tests for a full-scale vessel with a loaded displacement of 2500 tonnes. These slams can impart impulses on the bow of up to 938 tonne weight-seconds (9.20 MNs) and strain energy of up to 3.5 MJ into the ship structure based on scaled model test data. The impact energy is transferred primarily to the main longitudinal whipping mode, which decays with an overall structural damping ratio of 0.02 to 0.06, this being strongly dependent on internal frictional mechanisms within the ship structure.

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Section: Review Of Wave Slamming On Full-scale Vesselsmentioning

confidence: 99%

Wave impact loads on wave-piercing catamarans

et al. 2017

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“…The range of impact velocities was primarily selected based on Froude scaling of full-scale slam events measured and analysed by Jacobi et al (2014), which stated that the relative vertical velocities could reach 13 m/s, which is equivalent to 3.5 m/s. The trim angle of 5° was selected on the basis of past model seakeeping tests conducted by Lavroff et al (2013) on a 112m INCAT catamaran, which showed that the peak pitch angle of a 2.5 m catamaran model could reach a maximum of 5.1°.…”

Section: Test Conditionsmentioning

confidence: 99%

Wetdeck slamming loads on a developed catamaran hullform – experimental investigation

Swidan

Thomas

Penesis

et al. 2016

Ships and Offshore Structures

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Catamaran wetdeck slamming has been experimentally investigated using a servo hydraulic slam testing system. A series of controlled-speed water impacts was undertaken on a rigid catamaran bow section with two interchangeable centrebows. Entry into the body of water was at two fixed trim angles; 0 and 5 degrees. The vertical velocity was varied from 3 to 5 m/s in 0.5 m/s increments. This study presents a new dataset of pressure distributions and slam forces on the arched wetdeck structure of catamaran vessels. The relationships between the peak force magnitudes, relative impact angle and vertical velocity are observed, with a small reduction in slam force for an amended centrebow. Limited pressure measurements along the archway were not found to be representative of wetdeck slamming loads.

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“…This research has involved full scale measurements on INCAT vessels [8][9][10], model towing tank experiments [11,12] and model drop test experiments [1,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction of Symmetric Water Impact Loads on Wedge Shaped Hull Form Using CFD

Swidan¹,

Amin²,

Ranmuthugala³

et al. 2013

WJM

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Over the past two decades high-speed vessels have extended their service areas from protected waters to the open ocean where frequent and large water impacts can result in structural damage. The accurate prediction of slamming loads, and their consequences on light-weight high-speed vessels, is an essential element of efficient structural design. The aim of this work is to understand and accurately predict the behavior and local slam loads of quasi-2D wedge shaped hull forms impacting water. The computed results, using finite-volume Computational Fluid Dynamics (CFD), are validated against drop test experimental data and compared to a previously published numerical simulation using Smoothed Particle Hydrodynamics (SPH). The CFD results show good agreement with the experimental measurements.

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Wave slamming loads on wave-piercer catamarans operating at high-speed determined by hydro-elastic segmented model experiments

Cited by 53 publications

References 7 publications

Wave impact loads on wave-piercing catamarans

Wave impact loads on wave-piercing catamarans

Wetdeck slamming loads on a developed catamaran hullform – experimental investigation

Numerical Prediction of Symmetric Water Impact Loads on Wedge Shaped Hull Form Using CFD

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