Abstract With the sea-ice diminishing steadily in the polar regions, there has been growing interest in new transit routes through polar waters using cost-effective transportation. Among the international regulators o...Abstract With the sea-ice diminishing steadily in the polar regions, there has been growing interest in new transit routes through polar waters using cost-effective transportation. Among the international regulators over polar shipping, the International Maritime Organization （IMO） is the leading body concerned with drafting marine safety and environmental protection rules. The mandatory Polar Code （International Code for Ships Operating in Polar Waters） adopted by the IMO signals the consensus among maritime states to apply compulsory rules to vessels operating in Arctic and Antarctic waters. As the standing member of the IMO and a major global shipping power, China is preparing to adopt national regulatory standards to develop an adequate vessel infrastructure and crew training system. Proceeding in parallel with the developing polar shipping industry, China will also move ahead in comprehensive collaboration with the Nordic states regarding polar issues.展开更多
Polar ships need to meet stringent safety and environmental requirements.Usually those ships are classified by diferent ice classes based on ice operation capability.However,the polar ships are also trapped by severe ...Polar ships need to meet stringent safety and environmental requirements.Usually those ships are classified by diferent ice classes based on ice operation capability.However,the polar ships are also trapped by severe ice condition due to low propulsion power.Therefore,it is a realistic question to design the appropriate minimum propulsion power for ice operation.This paper focuses on the ice resistance and its related propulsion power for the ships with polar code(PC)classes.In consideration of seven typical polar ice conditions related to the PC rule of International Association of Classification Societies(IACS),a prediction method of ice resistance is developed by Lindqvist's model.The results are compared with those of Lindqvist's model and Riska's model by using two real ship lines.The comparison among propulsion requirements of representative classification societies is made,and a formula of minimum propulsion power is presented on the basis of ice resistance by revised Finnish-Swedish Ice Class Rules(FSICR)method.The results are verified by the actual values from seven ice class ships.A relatively good agreement is achieved.As a conclusion,the presented prediction method of ice resistance and minimum propulsion power is recommended for evaluation of ice resistance and its related propulsion power during the process of developing polar ships.展开更多
为提高乘客舒适度,利用调谐质量阻尼器(tuned mass damper,TMD)对100 m X-BOW型极地探险邮轮的局部振动进行控制。建立邮轮的有限元模型,进行整船频响分析,通过比较仿真值与测试值间的误差,验证模型的有效性。根据整体模态等价质量求解...为提高乘客舒适度,利用调谐质量阻尼器(tuned mass damper,TMD)对100 m X-BOW型极地探险邮轮的局部振动进行控制。建立邮轮的有限元模型,进行整船频响分析,通过比较仿真值与测试值间的误差,验证模型的有效性。根据整体模态等价质量求解方法和局部模态质量的空间分布原则,提出混合模态中单个局部模态等价质量的求解方法,利用该方法求解邮轮局部振动区域的等价质量;利用该等价质量计算TMD的质量比;基于该质量比,求解出对应的TMD参数最优解。通过分析可知,当质量比为0.05时,TMD在13.4 Hz处具有31 dB的吸振效果,同时在10 Hz和18.8 Hz处也有一定的吸振效果,分别为3 dB和2 dB,整体控制频段较平坦,鲁棒性也较佳。展开更多
基金funded by the National Social Science Fund Project:Precautionary Obligations of States in Developing and Utilizing Transboundary Water Resources(Grant no.15BFX205)Shanghai Philosophy and Social Sciences Project:Research on Passage Rights of the Arctic Sea Route(Grant no.2013BFX002)
文摘Abstract With the sea-ice diminishing steadily in the polar regions, there has been growing interest in new transit routes through polar waters using cost-effective transportation. Among the international regulators over polar shipping, the International Maritime Organization （IMO） is the leading body concerned with drafting marine safety and environmental protection rules. The mandatory Polar Code （International Code for Ships Operating in Polar Waters） adopted by the IMO signals the consensus among maritime states to apply compulsory rules to vessels operating in Arctic and Antarctic waters. As the standing member of the IMO and a major global shipping power, China is preparing to adopt national regulatory standards to develop an adequate vessel infrastructure and crew training system. Proceeding in parallel with the developing polar shipping industry, China will also move ahead in comprehensive collaboration with the Nordic states regarding polar issues.
基金the National Natural Science Foun-dation of China(Nos.51809124 and 51911530156)the Natural Science Foundation of Jiangsu Province(No.BK20170576)+1 种基金the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province(No.17KJB580006)the Project of State Key Lab-oratory of Ocean Engineering of Shanghai Jiao Tong University(No.1704,1807)。
文摘Polar ships need to meet stringent safety and environmental requirements.Usually those ships are classified by diferent ice classes based on ice operation capability.However,the polar ships are also trapped by severe ice condition due to low propulsion power.Therefore,it is a realistic question to design the appropriate minimum propulsion power for ice operation.This paper focuses on the ice resistance and its related propulsion power for the ships with polar code(PC)classes.In consideration of seven typical polar ice conditions related to the PC rule of International Association of Classification Societies(IACS),a prediction method of ice resistance is developed by Lindqvist's model.The results are compared with those of Lindqvist's model and Riska's model by using two real ship lines.The comparison among propulsion requirements of representative classification societies is made,and a formula of minimum propulsion power is presented on the basis of ice resistance by revised Finnish-Swedish Ice Class Rules(FSICR)method.The results are verified by the actual values from seven ice class ships.A relatively good agreement is achieved.As a conclusion,the presented prediction method of ice resistance and minimum propulsion power is recommended for evaluation of ice resistance and its related propulsion power during the process of developing polar ships.
