摘要：在确保结构的强度可靠性能前提下,为了获得ITER过.docVIP

摘 要：在确保结构的强度可靠性能前提下，为了获得ITER 过渡馈线S 弯盒的最优结构参数和加强筋的数目，使其在临界压力载荷作用下的应力分布更加均匀合理、耗材相对较小。 For the acquirement of the ITER cryostat feedthrough S-bend box optimization structure parameters and the number of stiffeners, with the ensure of structure strength reliability performance, make the stress distribution much more uniform and rational, and use of relatively less material under the critical pressure load effect. 本文在对设置不同加强筋数目的S 弯盒进行了参数化建模及静力分析校核的基础上，通过ANSYS优化设计模块，以S 弯盒的总体位移为目标函数、以最大应力和合理的质量为状态变量、以壁厚尺寸和加强筋间距尺寸为设计变量进行了优化分析。 On the basis of setting up various numbers of stiffener S-bend box to carry out parameter modeling and static analysis verification, use ANSYS to optimize design model, defined total displacement as target function, maximum stress and rational quality as state variable, thickness and stiffener space size as design variable to optimization analysis. 优化分析的结果表明：当S 弯盒加强筋数量N取3；最大等效应力从108Mpa下降到100Mpa、降低幅度为7.41%；重量从6830Kg下降到6603Kg、降低幅度为3.32%；最大位移从1.694mm下降到1.411mm，降低幅度为16.70%时，S弯盒达到最优解。 The result of optimization analysis indicate that: as S-bend box stiffener number is 3, the maximum equivalent stress down from 108Mpa to 100Mpa, the declining range is 7.41 percent; weight decrease from 6830Kg to 6603Kg, dropped by 3.32 percent, maximum displacement decrease from 1.694mm to 1.411mm, dropped by 16.70 percent, the S-bend box get the optimum solution. 通过优化设计获得的S 弯盒结构参数和加强筋的数目，满足了设计要求，应力分布更加均匀合理，提高了S 弯盒的可靠性和安全性，为下一步研制S弯盒提供了技术参数和依据。 The acquirement of S-bend box structure parameter and stiffener number with optimization analysis, meet the design requirement, make the tress distribution more uniform and rational, and improve the S-bend box reliability and security, also provide technical parameter and data for the next S-bend box development. 1.ITER 过渡馈线S 弯盒是一个长方形的薄壁真空压力容器，主要用于容纳超导母线Busbar和冷却管路的S 形弯曲部分。根据ITER 国际组提供的资料，S 弯盒的长度为3500mm、高度1500mm、宽度1430mm。其工作条件为：外部为室温、大气压力，内部为低温、真空环境。正常工作时容器内外的压力差为0.1MPa、故障态时的内部压力上升到0.2MPa，选用的材料为304不锈钢。 2．ITER过渡馈线S 弯盒有限元模型 2．1 S 弯盒不同