摘要
针对不规则波浪作用下Wigley型船的运动响应问题进行了系统的研究,采用统计学方法深入探讨了船舶不规则运动幅值和响应周期的分布规律,并通过傅里叶变换对船舶运动响应进行了频谱特征分析。结果表明,船舶横摇方向与升沉和纵摇方向随机运动的响应特征有显著差异。在升沉与纵摇方向,波浪谱峰频率远离自振频率,前十分之一大振幅运动对应周期离散性较小,基本稳定在波浪谱峰周期附近,但小振幅运动周期分布离散性较大,频谱分析指出船舶升沉与纵摇运动响应频谱在波浪谱峰频率附近出现明显峰值。而在横摇方向,波浪谱峰频率与自振频率相耦合,不同振幅的横摇运动响应周期均稳定在自振周期附近,且周期离散性较小,频谱分析也表明横摇运动响应频谱主要集中于船舶运动自振频率附近。
The motion responses of Wigley ship in irregular waves are investigated systematically.The distribution of the amplitude and response period of random motion in irregular waves is discussed by statistical method,the spectra of ship motion are also obtained by spectral calculation.The numerical results show that there are significant differences in the response characteristics between the random motion in the rolling direction,heaving direction and pitching direction.For heaving and pitching motion,because the peak frequency of wave spectrum is far away from the natural frequency,the dispersion of the period corresponding to large⁃amplitude motion is small,which is basically stable near the peak period of the wave spectrum,while the dispersion of the period distribution corresponding to small⁃amplitude motion is large.And Fourier analysis indicates that the response frequency of heaving and pitching motion has obvious peak values near the peak frequency of wave spectrum.For rolling motion,since the peak frequency of wave spectrum is coupled with the natural frequency,the response period of rolling motion with different amplitudes is stable near the natural vibration period and the period dispersion is small.The spectrum analysis also shows that the response spectrum of rolling motion is mainly concentrated near the natural frequency of ship motion.
作者
杜一豪
纪翀
姜胜超
顾丹丹
米晓林
DU Yihao;JI Chong;JIANG Shengchao;GU Dandan;MI Xiaolin(School of Naval Architecture,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Science and Technology on Electromagnetic Scattering Laboratory,Shanghai 200438,China)
出处
《海洋工程》
CSCD
北大核心
2021年第3期31-41,共11页
The Ocean Engineering
基金
国家自然科学基本资助项目(51909027,61901269)
中央高校基本科研业务费资助(DUT21LK12)。
