Pure loss of stability calculation of naval ship in regular waves

ZHU Jun1 LIU Ruijie2 GE Yijun1 WANG Zhiyu1 HUANG Kunlun1

(1.Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan, China 430033)
(2.Naval Academy of Armament, Beijing, China 100073)

【Abstract】The pure loss of stability of a ship is one of the failure modes of the second-generation intact stability criteria. Based on the static surface coordinate system, the generalized pitch angle and draught variable are defined, and a wave equation with clear physical meaning is deduced. Based on the Froude-Krylov hypothesis, combined with AutoCAD 2D surface area computing technology and the VBA programming method, a calculation method of the loss of pure stability of ships in regular waves is proposed. For a naval ship, the righting arm is calculated in regular waves, and the large heel ship state is shown to have an identical convergence. The results of the calculations show that a significant reduction in the metacentric height of the maximum righting arm occurs not just in a wave crest but also in a trough. By analyzing the wave profile under the hull, it can be clearly seen that wave amplitude above the deck or below the bottom of the hull causes the pure loss of stability, and in oblique waves or beam seas, the pure loss of stability causes the asymmetry of the wave profile on the hull. The coinciding convergence of the calculations shows that the process of the definition of generalized pitch can be employed to assess the pure loss of stability of naval ships in regular waves.

【Keywords】 naval ship; pure loss of stability; regular waves;

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This Article

ISSN:1673-3185

CN: 42-1755/TJ

Vol 12, No. 03, Pages 1-6+15

June 2017

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Article Outline

Abstract

  • 0 Introduction
  • 1 Wave equation in the hull coordinate system
  • 2 Formula of righting arm
  • 3 Numerical calculation and analysis
  • 4 Conclusion
  • References