摘要：Optimal design of the tank has a significant effect on reducing the weight of a launch vehicle’s *** this paper,the key characteristics of a stiffened shell are identified from the design requirements,focusing on the influence of the internal pressure on the axial compression load-bearing *** computing method of the ultimate load of the stiffened shell,the parametric modeling method and the surrogate modeling technique for optimal design are *** optimization process applicable to the stiffened shell was developed and applied in the optimization work for the tanks of solid-liquid bundled launch vehicle,so a better weight reduction effect could be achieved.

摘要：栅格舵是一种运载火箭气动控制机构,在火箭子级回收阶段发挥重要作用。针对栅格舵舵面需求量大,分析现有拼焊加工方法存在的问题,从提高栅格舵舵面加工可靠性出发,提出舵面铸造成型方案,对舵面结构实施优化,开展铸造成型技术攻关,进行了工艺设计、铸造数值模拟仿真、试件生产及检测,获得了满足技术指标要求的产品。研究表明:与拼焊工艺相比,采用整体铸造成型技术可有效解决栅格舵装配变形、焊接缺陷等问题,可提高产品可靠性,对设计制造可重复使用火箭具有一定指导意义。

摘要：结合交直流两侧谐波传递特性和直流线路分布参数特性,对直流回路谐振原理进行分析。用受控源等效换流器交直流两侧谐波传递特性,以单极大地模式为例,推导了换流器直流侧等效阻抗;同时,针对在直流回路中加装阻塞滤波器的谐振抑制措施,详细分析了阻波器元件参数、布置方式等对直流回路阻抗的影响。证明在中性母线以交叉布置方式串联接入阻波器能够对50 Hz和100 Hz谐振起到很好的谐振抑制效果,同时在阻波器设计时,应以电容电感并联结构为基础,对元件参数偏差作出限制。在PSCAD/EMTDC仿真平台建立了直流回路模型和直流详细仿真模型,通过阻抗频率特性扫描和时域仿真结合的方法,对上述影响进行了仿真验证,研究成果可为长距离特高压直流输电直流回路谐振研究提供参考。