Drift-wood collision load on bow structure of high-speed vessels

Published Date
Marine Structures
January 2009, Vol.22(1):24–41, doi:10.1016/j.marstruc.2008.06.004
Selected papers from the 3rd International Conference on Collision and Grounding of Ships

Author 

• Yasumi Toyama 

• Department of Naval Architecture & Ocean Engineering, School of Marine Science and Technology, Tokai University, Japan

Available online 5 September 2008.

Abstract

Impact load estimation of drift-wood hitting against the bow structure of high-speed vessels has been investigated. It may be difficult for the craft operator to detect in advance a drift-wood floating just below the ocean surface and to avoid the collision with it. It is particularly difficult for operators of the high-speed vessels in night cruising mode. The probability of the accident may be higher than that of the collision with rocks or other ships because of the difficulties of early detection of the floating object. Impact loads are estimated for drift-wood of different sizes and craft speed considering whipping motion and local crushing of the wood at the hitting region. A simplified formula for the load estimation is proposed based on the modal approach and the energy balance. Predicted impact loads can be applied to the initial design of the bow structure and collision bulkhead of the craft to secure the structural safety against a possible accident.

Keywords

• Ship collision
• Drift-wood
• Collision load
• High-speed vessel

---

Fig. 1.

 Table 1

Table 1.

Fig. 2.

 Table 2

Table 2.

Fig. 3.

Fig. 4.

Fig. 5.

 Table 3

Table 3.

Fig. 6.

Fig. 7.

Fig. 8.

Fig. 9.

Fig. 10.

Fig. 11.

Fig. 12.

Fig. 13.

Fig. 14.

Fig. 15.

Fig. 16.

Fig. 17.

Fig. 18.

Fig. 19.

Fig. 20.

Fig. 21.

Fig. 22.

Copyright © 2008 Elsevier Ltd. All rights reserved.

For further details log on website :

http://www.sciencedirect.com/science/article/pii/S0951833908000300