星载铯束管内铯炉的力学特性研究

Simulation of Mechanical Characteristics of Cs-Oven in Space-Borne Cs-Beam Tube

在ANSYS Workbench软件中建立了星载铯束管内铯炉的有限元模型。采用兰索斯法对模型作了模态分析,获得了铯炉的固有频率及振型。利用模态叠加法对模型作了铯炉的谐响应分析,研究了铯炉及其内部关键部件的结构变形与应力分布情况。数值结果表明:炉体主体结构和铯泡支撑体是铯炉力学特性的关键环节,会影响石墨、铯泡和准直器的工作性能。针对结构设计中存在的薄弱环节,提出了对铯炉主体结构和铯泡支撑体进行改进的有效措施。改进后铯炉的力学特性增强,对比铯束管内芯的基频,可避免铯炉不会发生共振。同时,由于抑制了振动对炉体内关键部件的影响,使得铯炉对铯流体的管理能力明显增强。

The mechanical behavior of the Cs-oven in space borne Cs-beam tube （CBT） was mathematically modeled,theoretically analyzed in Black Lanezos method and numerically simulated in finite element method with software ANSYS Workbench for design optimization of its structure. Moreover, the structural deformation and equiva- lent stress of the pivotal parts in Cs-oven were investigated by analyzing the harmonic response of the Cs-oven in mode superposition method. The simulated results show that Cs-oven structure and Cs-ampoule support signifi- cantly affect the performance of the graphite, Cs-ampoule and collimator. We suggest that the management ability of Cs-fluidmay be considerably enhanced by effectively suppressing the resonance between the Ce-oven and CBT framework with appropriately strengthened support structure.