The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability o...The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability of damaged ship under dead ship condition, this paper investigates two methods that can be used to research the capsizing probability in time domain, which mainly focus on the nonlinear righting lever GZ curve solution. One method subjects the influence of damaged tanks on the hull shape down to the wind and wave, and the other method is consistent with the real-time calculation of the GZ curve. On the basis of one degree of freedom rolling equation, the solution is Monte Carlo method, and a damaged fishery bureau vessel is taken as a sample ship. In addition, the results of the time-domain capsizing probability under different loading conditions are compared and analyzed. The relation of GM and heeling angle with the capsizing probability is investigated, and its possible reason is analyzed. On the basis of combining the time-domain flooding process with the capsizing probability calculation, this research aims to lay the foundation for the study of capsizing probability in time domain under dead ship condition, as well as provide technical support for capsizing mechanism of dead ship stability and damage stability criteria establishment in waves.展开更多
基于一阶时滞模型FOPDT(First order dynamics plus dead time)与继电器反馈构成的系统产生的极限环,提出了一种简单、精确的参数辨识方法.通过手动或智能测量设备就可以测得输出上几个点的数据,进一步可辨识出模型参数.低阶滤波器被用...基于一阶时滞模型FOPDT(First order dynamics plus dead time)与继电器反馈构成的系统产生的极限环,提出了一种简单、精确的参数辨识方法.通过手动或智能测量设备就可以测得输出上几个点的数据,进一步可辨识出模型参数.低阶滤波器被用来提高采用史密斯预估器控制系统的鲁棒性,简单的FOPDT模型用于具有时滞主导的高阶系统.仿真和分析表明了该自调节控制器的有效性、鲁棒性和显著的性能改进.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.51509124 and 51681340360)the Hi-Tech Ship Project of the Ministry of Industry and Technology(Grant No.2016[26])
文摘The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability of damaged ship under dead ship condition, this paper investigates two methods that can be used to research the capsizing probability in time domain, which mainly focus on the nonlinear righting lever GZ curve solution. One method subjects the influence of damaged tanks on the hull shape down to the wind and wave, and the other method is consistent with the real-time calculation of the GZ curve. On the basis of one degree of freedom rolling equation, the solution is Monte Carlo method, and a damaged fishery bureau vessel is taken as a sample ship. In addition, the results of the time-domain capsizing probability under different loading conditions are compared and analyzed. The relation of GM and heeling angle with the capsizing probability is investigated, and its possible reason is analyzed. On the basis of combining the time-domain flooding process with the capsizing probability calculation, this research aims to lay the foundation for the study of capsizing probability in time domain under dead ship condition, as well as provide technical support for capsizing mechanism of dead ship stability and damage stability criteria establishment in waves.
文摘基于一阶时滞模型FOPDT(First order dynamics plus dead time)与继电器反馈构成的系统产生的极限环,提出了一种简单、精确的参数辨识方法.通过手动或智能测量设备就可以测得输出上几个点的数据,进一步可辨识出模型参数.低阶滤波器被用来提高采用史密斯预估器控制系统的鲁棒性,简单的FOPDT模型用于具有时滞主导的高阶系统.仿真和分析表明了该自调节控制器的有效性、鲁棒性和显著的性能改进.
