Improvement of practical numerical calculation method of STF strip theory

WU Hai-peng; LIU Yin-dong

doi:10.16411/j.cnki.issn1006-7736.2020.01.002

Journal of Dalian Maritime University >

2020 , Vol. 46 >Issue 1: 10 - 19

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2020.01.002

Improvement of practical numerical calculation method of STF strip theory

WU Hai-peng ,
LIU Yin-dong

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(Naval Architecture and Ocean Engineering College,Dalian Maritime University, Dalian 116026,China）

Received date: 2019-05-22

Revised date: 2019-09-25

Online published: 2019-09-25

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Abstract

Based on STF strip theory, five DOF coupled motion equations of a ship moving in regular oblique waves were established and corrected by considering the influence of speed and bulbous bow on hydrodynamic coefficients. In addition, Ikeda’s semi-empirical formula was introduced to modify the roll damping coefficient term in the original formula, which did not consider the fluid viscosity. Simpson integral method and fourth-order Runge-Kutta differential method were used to numerically calculate the hydrodynamic coefficients and variation of freedom degrees with time history, respectively. Taking Wigley series ships and the teaching practice ship as examples, the hydrodynamic coefficients, wave disturbance forces and moments, and the motion amplitudes of freedom degrees were compared with the relevant experimental values, other literature results and the numerical simulation results of commercial software. The results show that the rolling motion amplitude is more approximate to the numerical simulation results of commercial software by nonlinear correction, and the results of other degrees of freedom are in good agreement with the experimental values and other literature results, which prove the feasibility of the proposed calculation method and the practical engineering value.

Key words： STF strip theory; ship motion; numerical calculation; rolling damping coefficient; nonlinear correction

Cite this article

WU Hai-peng , LIU Yin-dong . Improvement of practical numerical calculation method of STF strip theory[J]. Journal of Dalian Maritime University, 2020 , 46(1) : 10 -19 . DOI: 10.16411/j.cnki.issn1006-7736.2020.01.002

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