不规则波作用下的船舶撞击作用
THE IMPACT ACTION OF SHIPS UNDER THE ACTION OF IRREGULAR WAVES
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摘要: 随着波谱理论研究的发展,各种海工结构及船舶的荷载及其内力分析也日趋应用不规则波的计算方法。目前对于外海码头在波浪作用下的船舶撞击荷载还应用规则波的研究方法,对其应用不规则波分析方法的途径以及在考虑波谱作用后会有怎样的结果等问题目前还较少研究。本文试图对此问题进行初步的分析。Abstract: According to an analysis of the dynamic characteristics of ships moored at the offshore terminals under the action of wind-waves,the moored ship system may be simplified into a linear one.Introducing the transfer funtion Y√e(ω),the impact energy of moored ships to the terminals by the random sea may be obtained from the spectra of ocean waves.Furthermore,by using the directional function of ocean waves Y2 (α),the directional spectrum of the impact by ships can be estimated.From the experimental data a semi-empirical formula for calcufating the transfer function Y√e(ω) for oil-tanker with a displacement from 50,000 d.w.t.to 200,000 d.w.t.and an empirical formula for calculating the directional function of impact Y2 (α) are given in this paper.The results show that the spectrum of ocean waves has significant influence to the impact energy of ships.The value of impact energy calculated by the method of regular waves is compared to the method of irregular waves,and the influence of the directional distribution of ocean waves is also considered.
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