| 红外探测器杜瓦组件的悬臂梁结构优化设计方法 |
| 投稿时间：2024-06-11 修订日期：2024-06-19 点此下载全文 |
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| 中文摘要:制冷红外探测器的杜瓦组件在大量级振动应用场景中，悬臂梁结构容易遭到破坏。本文设计了一种非接触式螺旋弹簧支撑环结构，在杜瓦外壳和冷指之间，通过非接触的方式大幅减小传统加强方案带来的杜瓦漏热增加，并将振动能量转换成弹性势能，降低大量级振动对冷头的应力影响。经过Ansys软件模拟分析和优化后，铂铱丝最大变形量为1.7 mm，比常规结构下降了57.5%，最大应力为307 MPa，下降了52%。实验证实表明优化后的平均漏热仅增加了1%，同时具有显著提高的抗振性能。常规结构的组件在15 grms耐久随机振动后会出现铂铱丝断裂现象，而优化后的组件则能够承受15 grms耐久随机振动和17.6 grms短时大量级随机振动，并在17.6 grms随机振动过程中保持探测器焦温稳定，其正常运行不受影响。 |
| 中文关键词:红外探测器，杜瓦，振动，螺旋弹簧支撑环，悬臂梁 |
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| Optimized Design Method for the Cantilever Beam Structure of Infrared Detector-Dewar Module |
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| Abstract:The dewar component of the refrigeration infrared detector is prone to damage in high-level vibration applications, especially in cantilever beam structures. In this paper, a non-contact spiral spring support ring structure is designed between the dewar housing and the cold finger to reduce the heat leakage caused by traditional reinforcement schemes in a non-contact manner, and to convert vibration energy into elastic potential energy, thereby reducing the stress impact of high-level vibrations on the cold head. After simulation analysis and optimization using Ansys software, it is found that the maximum deformation of the platinum-iridium wire decreased by 57.5% to 1.7 mm compared to conventional structures, and the maximum stress decreased by 52% to 307 MPa. Experimental results showed that the average heat leakage increased by only 1% after optimization, while significantly improving anti-vibration performance. The components with conventional structures would experience platinum-iridium wire breakage after enduring 15 grms durable random vibration; however, those with optimized structures could withstand both 15 grms durable random vibration and short-term high-level random vibration of 17.6 grms without affecting detector focal plane temperature stability during operation under 17.6 grms random vibration conditions. |
| keywords:Infrared detector, Dewar, Vibration, Helical spring support ring, Cantilever Beam |
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