共查询到19条相似文献,搜索用时 109 毫秒
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遇难船舶漂流轨迹预测技术 总被引:3,自引:0,他引:3
概观了国内外有关海上搜救以及遇难船舶漂流轨迹预测技术研究的现状。在综合考察相关研究成果的基础上,探讨了在既往的漂流轨迹预测系统里追加波浪所引起的漂流速度成分,以提高漂流轨迹预测的精度。 相似文献
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为提高海上搜救的成功率,最大限度地减少生命和财产损失,需要快速确定包含搜寻目标漂移后的最小搜寻区域.在海洋环境数值预报模式下,考虑了不同的遇险推测场景条件,采用随机粒子仿真法确定了目标初始概率分布,恰当地描述了海洋环境数据以及风压系数中的不确定性因素对目标漂移的影响,建立了搜寻目标整体漂移模型.采用该整体漂移模型对落水人员漂移区域进行了数值预测仿真.仿真结果表明:随机粒子仿真法能准确预测搜寻区域,较好地利用现有的环境数据库信息,实时计算搜寻区域的包含率,生成指定时刻的概率分布图,相比于采用传统解析方法预测搜寻区域约缩小1/2. 相似文献
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海上搜救工作的有效开展是确保海上人命财产安全的重要保障。笔者从事海上搜救工作多年,并参与多起重大及特重大海上事故的搜救工作,对我国渤海海上搜救存在的薄弱环节有初步了解,通过文章进一步对搜救法规和渤海搜救工作现状的分析来探讨如何加强渤海区域搜救合作,提高海上搜救的效能。 相似文献
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《船舶与海洋工程学报》2021,(3)
Water transportation today has become increasingly busy because of economic globalization.In order to solve the problem of inaccurate port traffic flow prediction,this paper proposes an algorithm based on gated recurrent units(GRUs) and Markov residual correction to pass a fixed cross-section.To analyze the traffic flow of ships,the statistical method of ship traffic flow based on the automatic identification system(AIS) is introduced.And a model is put forward for predicting the ship flow.According to the basic principle of cyclic neural networks,the law of ship traffic flow in the channel is explored in the time series.Experiments have been performed using a large number of AIS data in the waters near Xiazhimen in Zhoushan,Ningbo,and the results show that the accuracy of the GRU-Markov algorithm is higher than that of other algorithms,proving the practicability and effectiveness of this method in ship flow prediction. 相似文献
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针对群智能算法解决动力定位推力分配问题易陷入局部最优、计算时间长等不足,基于粒子群算法探索不同粒子决策变量对推力分配结果的影响。首先考虑推力分配目标力和力矩、推力限制、禁止角等约束条件,以推进器功率最优、磨损最小为优化目标建立了推力分配数学模型,构建了基于三种不同粒子决策变量的粒子群推力分配算法;其次以算法结果的适应度值、计算消耗时间的均值和方差量化算法的收敛性和实时性,对上述三种方法进行了仿真分析,仿真结果对比表明,基于本文提出的粒子决策变量搜索在收敛性和实时性上均达到最优,对粒子群算法解决推力分配问题有一定的参考价值。 相似文献
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Masaru Tsujimoto Takashi Uehiro Hiroshi Esaki Takeshi Kinoshita Ken Takagi Susumu Tanaka Hiroshi Yamaguchi Hideo Okamura Masuho Satou Yoshimasa Minami 《Journal of Marine Science and Technology》2009,14(1):89-103
To acquire the wind energy of the oceans, a sailing wind farm has been proposed. The wind farm considered is composed of a
semisubmersible floating structure, 11 windmills, four sails, six thrusters, and storage for hydrogen. To maximize the acquired
energy, an effective algorithm to search for optimum routes was developed. The algorithm is based on the fact that beam winds
yield a maximum of acquired energy. This feature reduces the computation time, and, consequently, efficient route optimization
becomes possible in a reasonable time. After setting an operational area for the wind farm, navigation simulations for a 1-year
period were carried out. A numerical weather forecast was used as well as the responses of the floating structure, such as
the speed of the structure, the output power of the windmills, and the time of course changes. In the simulation, the wind
farm evades rough seas to avoid structural damage, and an optimum route is searched for. The capacity factor of the system
was used to evaluate the efficiency of the optimized routes. From the simulations, the maximum capacity factor achieved was
42.6%. The dependency of the capacity factor on the initial position of the wind farm was also examined. It was shown that
offshore from Sanriku in northeastern Japan is an area suited to the operation of the wind farm. The effect of the initial
position on consecutive periods of operation is discussed. 相似文献