波浪诱导的船舶6自由度
简化
不规则波
In this study, only long crested wave is considered and ITTC wave spectrum is applied. Significant wave height, HS, is 3.25m, modal period, TP, is 9.6second (sea state 5), and initial wave heading is 180deg.
Innovative Marine Hydrodynamics Lab
文献阅读
张志恒
2019/12/4
1. OMAE. 2. J. Offshore Mech. Arct. Eng.
Author: Min-Guk Seo Affliation: Korea research institute of ships and ocean
3. As for irregular wave condition, the turning performance can be affected by wave random phase. When the ship encounters the beam sea, the wave elevations play an essential role in the change of ship speed and turning trajectory.
2. For regular wave, the wave drift force is the most critical factor affecting turning performance. The wavelength is getting shorter, the drift distance of the turning trajectory becomes larger.
MMG model
Izz为艏摇方向惯性矩
Yasukawa, H.. 2006:
Wave drift force
In this study, the wave drift force is pre-calculated according to these related parameters(ship’s forward speed, lateral speed, wave heading and frequency), stored in a database and used for the maneuvering simulation
In this study, wave spectrum is divided into 500 parts and three different wave phase combinations are considered.
Conclusion
1. When using the corrected wave drift forces according to the lateral speed, the simulation results considering the lateral speed show better agreement with the experimental data than those without consideration.
The end!
速度势分解
稳定势 Double body approximation
人射波浪势 辐射波浪势 绕射波浪势 Rankine panel method
Rankine源（简单格林函数）G(
p,
q)Βιβλιοθήκη 1 r频域中运动方程
附加质量
恢复力矩阵 波浪诱导的运动
质量 阻尼系数矩阵 波激力矢量
直接积分船体表面压力计算波浪漂移力