Analytical Determination of Slamming Pressures for High-Speed Vehicles in Waves

Abstract

An analytical method is proposed for determining wave impact "slamming" pressures on all types of ship hulls including advanced vehicles that may travel at speeds up to 100 knots and even higher speeds. The method is based on the Wagner wedge impact theory, the Chuang cone impact theory, and experiments performed at the David W. Taylor Naval Ship Research and Development Center. Determination of the impact pressure is based on the hypothesis that the impact velocity is equal to the relative velocity normal to the impact surface of the moving body and the wave surface. The proposed method has been verified by several model tests in waves and by actual ship trials of the catamaran USNS Hayes. Computer programs are included for the practical use of the method.

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

“…According to Stavovy and Chuang (1976), the impact pressure can be determined by the where ρ denotes fluid density, K denotes impact pressure factor which mainly depends on the sectional shape especially the local dead-rise angle at a specific point considered, V denotes vertical relative speed between the ship structure and the wave. In the present method, the impact pressure during the whole water entry procedure is estimated by the above equation.…”

In-Service Transient Load Measurement on a Large Composite Panel

“…In the past four to five decades, research has provided increased knowledge of the nature of hydrodynamic loads, which together with the improvements in computing power have greatly enhanced the capability to determine the effects of these loads on ship structures. Starting with the work of von Karman [5], various research works have been carried out to describe hydrodynamic loads in Naval Architecture, on motorboats and sailboats in parallel with rules and regulations [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Furthermore, the introduction of composite materials in marine architecture, such as fast marine crafts, has brought new types of operational failures in panels.…”

“…This usually happens due to the localised impacts from service loads (such as slamming loads) often observed in composite high-speed crafts. Although, many studies have been carried out to describe the slamming phenomenon and its consequences on the design of ships made of metallic materials [10,[20][21][22][23][24][25][26], there are limited studies in this area for composite marine structures. In addition, as it is pointed out in various studies [1,27], there is a need for more accurate knowledge of the hydrodynamic impact on marine structure problems as the knowledge on wave impact is still far from sufficient.…”