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Appl. Sci. 2018, 8(5), 802; https://doi.org/10.3390/app8050802

Effects of Added Mass and Structural Damping on Dynamic Responses of a 3D Wedge Impacting on Water

1
College of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian 116026, China
2
Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger 4036, Norway
3
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Received: 13 March 2018 / Revised: 22 April 2018 / Accepted: 22 April 2018 / Published: 16 May 2018
(This article belongs to the Section Mechanical Engineering)
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Abstract

The impact between the wave and the bottom of a high-speed vessel is often simplified as water-entry problems of wedges. Most investigations focus on the water entry of two dimensional (2D) wedges. The effects of added mass and structural damping are still not fully investigated. By combining the normal mode method, the hydrodynamic impact model of rigid wedges and the potential flow theory, a dynamic model for predicting the response of a three dimensional (3D) wedge impacting on water with a constant velocity is established in this paper. The present model can selectively consider the effects of the added mass and the structural damping. The present method has been validated through comparisons with results of published literatures and commercial software. It is found that the added mass can increase the stress response before the flow separation, and reduce the vibration frequency after the flow separation. Due to the effect of the added mass, the stress response of some positions after the flow separation is even higher than that before the flow separation. The structural damping has a negligible effect on the stress before the flow separation, but it can reduce vibration stress after the flow separation. View Full-Text
Keywords: water impact; dynamic response; added mass; structural damping water impact; dynamic response; added mass; structural damping
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Yu, P.; Ong, M.C.; Li, H. Effects of Added Mass and Structural Damping on Dynamic Responses of a 3D Wedge Impacting on Water. Appl. Sci. 2018, 8, 802.

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