

@mastersthesis {6355,
	title = {Hydroelastic modelling of wetdeck slamming on multihull vessels},
	year = {1994},
	note = {C390525},
	school = {Universitetet i Trondheim Norges Tekniske Hogskole (Norway)},
	type = {phdDr.{Ing}.},
	address = {Ann Arbor},
	abstract = {Slamming against the wetdeck of a multihull vessel in head sea waves is studied analytically and numerically. The theoretical slamming model is a two-dimensional, asymptotic method valid for small local angles between the undisturbed water surface and the wetdeck in the impact region. The disturbance of the water surface as well as the local hydroelastic effects in the slamming area are accounted for. The wetdeck structure is modelled as a beam with support points. The elastic deflections of the wetdeck are expressed in terms of "dry" normal modes. The structural formulation accounts for the shear deformations and the rotatory inertia effects in the wetdeck. The interaction effects between the local loading and the global rigid ship motions are partly investigated. The hydroelastic response is scaled by identifying three different impact phases. Each impact phase has its own time scale. The three impact phases are the compressibility phase, the structural inertia phase and the added mass restoring phase. The maximum stresses occur in the third impact phase. The findings show that the slamming loads on the wetdeck and the resulting elastic stresses in the wetdeck are strongly influenced by the elasticity of the wetdeck structure. By scaling the hydroelastic response, a simple relation is obtained between the relative normal velocity in the impact region, the local geometry and the maximum local stresses in the wetdeck. If this relation is sufficient, it is possible to use the findings of this work in a simple statistical model to establish realistic design loads in different seastates.},
	keywords = {0547:Ocean engineering, Applied sciences, Ocean engineering},
	url = {http://search.proquest.com/docview/304161726?accountid=14270},
	author = {Kvalsvold, Jan}
}
