Abstract： The containment vessel of a nuclear power plant is the last barrier to prevent nuclear reactor radiation. Aseismic safety analysis is the key to appropriate containment vessel design. A prestressed concrete...Abstract： The containment vessel of a nuclear power plant is the last barrier to prevent nuclear reactor radiation. Aseismic safety analysis is the key to appropriate containment vessel design. A prestressed concrete containment vessel （PCCV） model with a semi-infinite elastic foundation and practical arrangement of tendons has been established to analyze the aseismic ability of the CPR1000 PCCV structure under seismic loads and internal pressure. A method to model the prestressing tendon and its interaction with concrete was proposed and the axial force of the prestressing tendons showed that the simulation was reasonable and accurate. The numerical results show that for the concrete structure, the location of the cylinder wall bottom around the equipment hatch and near the ring beam are critical locations with large principal stress. The concrete cracks occurred at the bottom of the PCCV cylinder wall under the peak earthquake motion of 0.50 g, however the PCCV was still basically in an elastic state. Furthermore, the concrete cracks occurred around the equipment hatch under the design internal pressure of 0.4MPa, but the steel liner was still in the elastic stage and its leak-proof function soundness was verified. The results provide the basis for analysis and design of containment vessels.展开更多
The design of a lightweight solar powered marine craft is considered in this report. Various design concepts were considered with respect to the hull type, resistance, aesthetics and the operating environment of the v...The design of a lightweight solar powered marine craft is considered in this report. Various design concepts were considered with respect to the hull type, resistance, aesthetics and the operating environment of the vessel. The planning hull-form catamaran was considered for the boat design. The resistance and other hydrodynamic characterization of boat were analyzed using the CAHI and Savitsky method. Detailed algorithm is developed for the sizing of the various components of the solar PV system for the boat. The hull resistance was found to be 740 N corresponding to the boat speed of 5?knot using the above stated methods. The motor power was obtained to be 2.239?kW (3 HP). Torqeedo outboard electric motor of 3?HP was selected for the boat propulsion. The battery bank was seized accordingly and four batteries of 235 AH and 12 V were selected for the storage of electric power for the boat propulsion. Hence, the solar PV module was sized. It was concluded that, due to the limited space for the installation of the PV module, additional source of power (land base) should be made available to completely charge the battery.展开更多
该文概述舰船综合电力系统(integrated power system,IPS)的原理、组成、分类、特点与技术难点,介绍国内外工程研制情况,综述集成设计、大容量直流源及其并联组网控制、大容量直驱式电力推进、直流大电流开断保护、电力电子静止电源、...该文概述舰船综合电力系统(integrated power system,IPS)的原理、组成、分类、特点与技术难点,介绍国内外工程研制情况,综述集成设计、大容量直流源及其并联组网控制、大容量直驱式电力推进、直流大电流开断保护、电力电子静止电源、高密度储能、智能化能量管理等7项共性技术及我国技术研究突破情况。针对IPS在民用新能源船舶、电动及混动飞机、轨道交通、海上能源高效利用等推广应用实际需求,给出系统推荐方案,并提出各应用场景下还需重点研究的内容,旨在为IPS在多领域推广应用提供参考。展开更多
基金National Natural Science Foundation of China under Grant Nos.51138001 and 51479027
文摘Abstract： The containment vessel of a nuclear power plant is the last barrier to prevent nuclear reactor radiation. Aseismic safety analysis is the key to appropriate containment vessel design. A prestressed concrete containment vessel （PCCV） model with a semi-infinite elastic foundation and practical arrangement of tendons has been established to analyze the aseismic ability of the CPR1000 PCCV structure under seismic loads and internal pressure. A method to model the prestressing tendon and its interaction with concrete was proposed and the axial force of the prestressing tendons showed that the simulation was reasonable and accurate. The numerical results show that for the concrete structure, the location of the cylinder wall bottom around the equipment hatch and near the ring beam are critical locations with large principal stress. The concrete cracks occurred at the bottom of the PCCV cylinder wall under the peak earthquake motion of 0.50 g, however the PCCV was still basically in an elastic state. Furthermore, the concrete cracks occurred around the equipment hatch under the design internal pressure of 0.4MPa, but the steel liner was still in the elastic stage and its leak-proof function soundness was verified. The results provide the basis for analysis and design of containment vessels.
文摘The design of a lightweight solar powered marine craft is considered in this report. Various design concepts were considered with respect to the hull type, resistance, aesthetics and the operating environment of the vessel. The planning hull-form catamaran was considered for the boat design. The resistance and other hydrodynamic characterization of boat were analyzed using the CAHI and Savitsky method. Detailed algorithm is developed for the sizing of the various components of the solar PV system for the boat. The hull resistance was found to be 740 N corresponding to the boat speed of 5?knot using the above stated methods. The motor power was obtained to be 2.239?kW (3 HP). Torqeedo outboard electric motor of 3?HP was selected for the boat propulsion. The battery bank was seized accordingly and four batteries of 235 AH and 12 V were selected for the storage of electric power for the boat propulsion. Hence, the solar PV module was sized. It was concluded that, due to the limited space for the installation of the PV module, additional source of power (land base) should be made available to completely charge the battery.
文摘该文概述舰船综合电力系统(integrated power system,IPS)的原理、组成、分类、特点与技术难点,介绍国内外工程研制情况,综述集成设计、大容量直流源及其并联组网控制、大容量直驱式电力推进、直流大电流开断保护、电力电子静止电源、高密度储能、智能化能量管理等7项共性技术及我国技术研究突破情况。针对IPS在民用新能源船舶、电动及混动飞机、轨道交通、海上能源高效利用等推广应用实际需求,给出系统推荐方案,并提出各应用场景下还需重点研究的内容,旨在为IPS在多领域推广应用提供参考。
