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首页> 外文会议>New Developments in Optomechanics; Proceedings of SPIE-The International Society for Optical Engineering; vol.6665 >Design of asymmetrically loaded end-plates with vacuum seal surfaces for the Navy Prototype Optical Interferometer
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Design of asymmetrically loaded end-plates with vacuum seal surfaces for the Navy Prototype Optical Interferometer

机译：用于海军原型光学干涉仪的带有真空密封表面的非对称加载端板的设计

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摘要

Engineering specifications for O-ring seal surfaces are well documented. However, when seal surfaces are located on asymmetrically loaded vacuum end-plates, consideration must be given not only to surface finish and flatness, but also to load-induced deflections. When deflections are significant, O-ring compression can relax and potentially cause vacuum leaks. Large vacuum systems, such as the 9000 cubic foot system at the Navy Prototype Optical Interferometer (NPOI), cannot afford costly vacuum leaks due to improper end-plate design. The NPOI employs vacuum end-plates that serve both as structural members, and as vacuum system entrance and exit ports for stellar light. These ports consist of vacuum components attached directly to the end-plate via static O-ring sealing techniques. Optical geometry dictates off-center port locations, which create asymmetric end-plate loading. This paper details the behavior of a 22 inch diameter, multi-port, end-plate for the NPOI Fast Delay Line subsystem. In depth CAD modeling and finite element analysis techniques were used to determine load-induced stress distributions and deflections in the end-plate. After several design iterations, an end-plate design was substantiated that maintains vacuum seal integrity under loading, exhibits a conservative factor of safety, and is readily manufacturable.
机译：O形圈密封表面的工程规范已得到充分证明。但是，当密封表面位于不对称负载的真空端板上时，不仅要考虑表面光洁度和平面度，还要考虑负载引起的挠曲。当挠度很大时，O形圈压缩会松弛，并可能导致真空泄漏。大型真空系统，例如海军原型光学干涉仪（NPOI）的9000立方英尺系统，由于端板设计不当而无法承受昂贵的真空泄漏。 NPOI使用真空端板，既用作结构构件，又用作恒星光的真空系统入口和出口。这些端口包括通过静态O形圈密封技术直接连接到端板上的真空组件。光学几何形状决定了偏心端口的位置，这会造成不对称的端板负载。本文详细介绍了NPOI快速延迟线子系统的22英寸直径多端口端板的性能。在深入的CAD建模和有限元分析技术的基础上，确定了端板中载荷引起的应力分布和挠度。经过多次设计迭代，证实了终板设计，该设计可在负载下保持真空密封的完整性，并显示出保守的安全系数，并且易于制造。

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