神光Ⅱ升级装置中靶场桁架的结构稳定性
Structure stability of superstructure in SG-Ⅱ upgrade facility
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摘要: 从提高结构稳定性的基本理论出发，利用有限元方法研究了靶场桁架结构稳定性。结果表明：影响大口径反射镜动态稳定性的主要因素为靶场桁架的第三阶模态振型，其薄弱环节为支撑立柱;通过在支撑立柱间增加横向加强筋、桁架立柱采用钢管混凝土结构等措施可有效提高桁架的结构稳定性;立柱截面最小方形空心型钢的尺寸为300 mm×6 mm。给出的靶场桁架的稳定性设计方案满足大口径反射镜的动态稳定性指标。Abstract: Based on the fundamental theory of improving structure stability, with the finite-element method (FEM), the research on the structure stability of the superstructure was performed. The results indicates that the third modal shape of the superstructure is the most important factor in the stability of the large aperture mirror, and the the weak link is the frame. With the stiffener with optimized position used between the frame and the concrete-filled steel tubular structure adopted for the frame, etc, the stability of the superstructure could be improved effectively. At last, the stability scheme of the superstructure was proposed which could satisfy the stability requirement of large aperture mirrors.
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Key words:
- high power laser /
- superstructure /
- structure stability /
- finite-element method
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