连续搅拌反应釜(Continuous Stirred Tank Reactor,CSTR)作为化工生产中的核心设备之一,具有典型的非线性特征。针对这种二阶非线性不确定系统,基于积分滑模的控制特性和RBF神经网络的逼近能力设计了一种基于数据驱动的自适应准滑模控...连续搅拌反应釜(Continuous Stirred Tank Reactor,CSTR)作为化工生产中的核心设备之一,具有典型的非线性特征。针对这种二阶非线性不确定系统,基于积分滑模的控制特性和RBF神经网络的逼近能力设计了一种基于数据驱动的自适应准滑模控制器。仿真结果表明,该算法能很好地使CSTR跟踪给定的温度信号,与普通滑模控制器相比,不需要动力学模型,放松了设计条件;与基于RBF神经网络整定的PID控制器相比,表现出较强的鲁棒性。展开更多
The crashworthiness of the cargo containment systems （CCSs） of a floating liquid natural gas （FLNG） and the side structures in side-by-side offioading operations scenario are studied in this paper. An FLNG vessel ...The crashworthiness of the cargo containment systems （CCSs） of a floating liquid natural gas （FLNG） and the side structures in side-by-side offioading operations scenario are studied in this paper. An FLNG vessel is exposed to potential threats from collisions with a liquid natural gas carrier （LNGC） during the offioading operations, which has been confirmed by a model test of FLNG-LNGC side-by-side offioading operations. A nonlinear finite element code LS-DYNA is used to simulate the collision scenarios during the offioading operations. Finite element models of an FLNG vessel and an LNGC are established for the purpose of this study, including a detailed LNG cargo containment system in the FLNG side model. Based on the parameters obtained from the model test and potential dangerous accidents, typical collision scenarios are defined to conduct a comprehensive study. To evaluate the safety of the FLNG vessel, a limit state is proposed based on the structural responses of the LNG CCS. The different characteristics of the structural responses for the primary structural components, energy dissipation and collision forces are obtained for various scenarios. Deformation of the inner hull is found to have a great effect on the responses of the LNG CCS, with approximately 160 mm deformation corresponding to the limit state. Densely arranged web frames can absorb over 35% of the collision energy and be proved to greatly enhance the crashwo- rthiness of the FLNG side structures.展开更多
文摘连续搅拌反应釜(Continuous Stirred Tank Reactor,CSTR)作为化工生产中的核心设备之一,具有典型的非线性特征。针对这种二阶非线性不确定系统,基于积分滑模的控制特性和RBF神经网络的逼近能力设计了一种基于数据驱动的自适应准滑模控制器。仿真结果表明,该算法能很好地使CSTR跟踪给定的温度信号,与普通滑模控制器相比,不需要动力学模型,放松了设计条件;与基于RBF神经网络整定的PID控制器相比,表现出较强的鲁棒性。
基金financially supported by the State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University(Grant No.HESS-1404)the National Natural Science Foundation of China(Grant No.51239007)
文摘The crashworthiness of the cargo containment systems （CCSs） of a floating liquid natural gas （FLNG） and the side structures in side-by-side offioading operations scenario are studied in this paper. An FLNG vessel is exposed to potential threats from collisions with a liquid natural gas carrier （LNGC） during the offioading operations, which has been confirmed by a model test of FLNG-LNGC side-by-side offioading operations. A nonlinear finite element code LS-DYNA is used to simulate the collision scenarios during the offioading operations. Finite element models of an FLNG vessel and an LNGC are established for the purpose of this study, including a detailed LNG cargo containment system in the FLNG side model. Based on the parameters obtained from the model test and potential dangerous accidents, typical collision scenarios are defined to conduct a comprehensive study. To evaluate the safety of the FLNG vessel, a limit state is proposed based on the structural responses of the LNG CCS. The different characteristics of the structural responses for the primary structural components, energy dissipation and collision forces are obtained for various scenarios. Deformation of the inner hull is found to have a great effect on the responses of the LNG CCS, with approximately 160 mm deformation corresponding to the limit state. Densely arranged web frames can absorb over 35% of the collision energy and be proved to greatly enhance the crashwo- rthiness of the FLNG side structures.
