ITER blanket design has progressed significantly since 2001, which resulted in a reduction in cost and an increase in performance with respect to FDR 2001. One of the most important improvements is the new coolant flo...ITER blanket design has progressed significantly since 2001, which resulted in a reduction in cost and an increase in performance with respect to FDR 2001. One of the most important improvements is the new coolant flow configuration in the shield block （ SB ） . In the current design TM, the cooling circuit in the SB is a matrix of radial holes which are arranged in eight poloidal rows. The rows are fed in parallel by front headers and back drilled collectors, and merge in four couples through the front header. These four couples of rows are linked in series by transverse holes. In the current design, a special shape of flow driver is mounted inside the radial hole, and coolant flows through clearance between the driver and drilled radial hole, which allows achieving a high coolant velocity,展开更多
ITER in-wall shielding （IIS） is situated between the doubled shells of the ITER Vacuum Vessel （IVV）. Its main functions are applied in shielding neutron, gamma-ray and toroidal field ripple reduction. The structur...ITER in-wall shielding （IIS） is situated between the doubled shells of the ITER Vacuum Vessel （IVV）. Its main functions are applied in shielding neutron, gamma-ray and toroidal field ripple reduction. The structure of IIS has been modelled according to the IVV design criteria which has been updated by the ITER team （IT）. Static analysis and thermal expansion analysis were performed for the structure. Thermal-hydraulic analysis verified the heat removal capability and resulting temperature, pressure, and velocity changes in the coolant flow. Consequently, our design work is possibly suitable as a reference for IT＇s updated or final design in its next step.展开更多
As the most significant performance, compliance of hydraulic system is defined as the capacity to accommodate the sudden change of the external load. Due to the different requirements of the compliant tasks, the exist...As the most significant performance, compliance of hydraulic system is defined as the capacity to accommodate the sudden change of the external load. Due to the different requirements of the compliant tasks, the existing method for mechanical systems cannot be used in the analysis and design of the hydraulic system. In this paper, the definition and expression of compliance of hydraulic system are proposed to evaluate the compliance of the hydraulic system operating under sudden change load. Because the unexpected geological conditions during excavation may exert sudden change load to the shield tunneling machine, the compliance theory has found a right application in the thrust hydraulic system. By analyzing the basic operating principle and the commonly used architectures of the thrust hydraulic system, a compliance based thrust hydraulic system design method is presented. Moreover, a tunneling case is investigated in the paper as an example to expound the validation of design procedure. In conclusion, the compliance of the hydraulic system can be served as an evaluation of the capability in conforming to the load impact, giving supports for the design of the thrust hydraulic system of shield tunneling machines.展开更多
盾构姿态控制过程中通过尽量减小各区压大小差异,可降低管片受剪开裂和纵向错台风险。为实现目标区压均衡分配,构建均衡分配几何模型,推导区压均衡约束条件,结合目标总推力和目标力矩条件,推导可实现任意多个区压均衡分配的计算公式。...盾构姿态控制过程中通过尽量减小各区压大小差异,可降低管片受剪开裂和纵向错台风险。为实现目标区压均衡分配,构建均衡分配几何模型,推导区压均衡约束条件,结合目标总推力和目标力矩条件,推导可实现任意多个区压均衡分配的计算公式。对比验证结果表明:1)相对于传统伪逆法和人工分配方法,所提出的均衡法有效提升了区压的均衡性,明显降低了相邻分区压差。2)基于区压均衡原则,提出不同总推力对应的力矩/力心极限边界解算方法,并描述了对应规律,即随着总推力由0 k N增长至分界值,同一方位的极限力矩由0 k N·m线性增至最大值,而极限力心半径为定值;当总推力继续增至最大总推力,极限力矩从最大值线性衰减至0 k N·m,极限力心也从最大值非线性衰减至0 m。3)基于所述极限边界,可避免力矩/力心设定超界引发的控制风险。展开更多
文摘ITER blanket design has progressed significantly since 2001, which resulted in a reduction in cost and an increase in performance with respect to FDR 2001. One of the most important improvements is the new coolant flow configuration in the shield block （ SB ） . In the current design TM, the cooling circuit in the SB is a matrix of radial holes which are arranged in eight poloidal rows. The rows are fed in parallel by front headers and back drilled collectors, and merge in four couples through the front header. These four couples of rows are linked in series by transverse holes. In the current design, a special shape of flow driver is mounted inside the radial hole, and coolant flows through clearance between the driver and drilled radial hole, which allows achieving a high coolant velocity,
基金the National 973 program of China(No.2004CB720704)
文摘ITER in-wall shielding （IIS） is situated between the doubled shells of the ITER Vacuum Vessel （IVV）. Its main functions are applied in shielding neutron, gamma-ray and toroidal field ripple reduction. The structure of IIS has been modelled according to the IVV design criteria which has been updated by the ITER team （IT）. Static analysis and thermal expansion analysis were performed for the structure. Thermal-hydraulic analysis verified the heat removal capability and resulting temperature, pressure, and velocity changes in the coolant flow. Consequently, our design work is possibly suitable as a reference for IT＇s updated or final design in its next step.
基金supported by the National Basic Research Program of China ("973" Program) (Grant No. 2007CB714004)the Open Fund of State Key Laboratory of Fluid Power Transmission and Control of Zhejiang University (Grant No. GZKF-201210)the National High-tech R&D Program of China ("863" Program) (Grant No. 2012AA040701)
文摘As the most significant performance, compliance of hydraulic system is defined as the capacity to accommodate the sudden change of the external load. Due to the different requirements of the compliant tasks, the existing method for mechanical systems cannot be used in the analysis and design of the hydraulic system. In this paper, the definition and expression of compliance of hydraulic system are proposed to evaluate the compliance of the hydraulic system operating under sudden change load. Because the unexpected geological conditions during excavation may exert sudden change load to the shield tunneling machine, the compliance theory has found a right application in the thrust hydraulic system. By analyzing the basic operating principle and the commonly used architectures of the thrust hydraulic system, a compliance based thrust hydraulic system design method is presented. Moreover, a tunneling case is investigated in the paper as an example to expound the validation of design procedure. In conclusion, the compliance of the hydraulic system can be served as an evaluation of the capability in conforming to the load impact, giving supports for the design of the thrust hydraulic system of shield tunneling machines.
文摘盾构姿态控制过程中通过尽量减小各区压大小差异,可降低管片受剪开裂和纵向错台风险。为实现目标区压均衡分配,构建均衡分配几何模型,推导区压均衡约束条件,结合目标总推力和目标力矩条件,推导可实现任意多个区压均衡分配的计算公式。对比验证结果表明:1)相对于传统伪逆法和人工分配方法,所提出的均衡法有效提升了区压的均衡性,明显降低了相邻分区压差。2)基于区压均衡原则,提出不同总推力对应的力矩/力心极限边界解算方法,并描述了对应规律,即随着总推力由0 k N增长至分界值,同一方位的极限力矩由0 k N·m线性增至最大值,而极限力心半径为定值;当总推力继续增至最大总推力,极限力矩从最大值线性衰减至0 k N·m,极限力心也从最大值非线性衰减至0 m。3)基于所述极限边界,可避免力矩/力心设定超界引发的控制风险。
