| 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 |
| 引用本文：张杨文,沈星,洪晓麦,程海玲,崔任鑫,江程鹏,曾卓,徐振华,李明畅,刘欣,黄立.红外探测器杜瓦组件的悬臂梁结构优化设计方法[J].红外,2024,45(12):26~33 |
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| 中文摘要:在大量级振动应用场景中，红外探测器杜瓦组件的悬臂梁结构容易遭到破坏。设计了一种非接触式螺旋弹簧支撑环结构。在杜瓦外壳与冷指之间，通过非接触的方式大幅减小传统加强方案所增加的杜瓦漏热，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，铂铱丝的最大变形量为1.7 mm，比常规结构下降了57.5%；最大应力为307 MPa，下降了52%。试验结果表明，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。采用常规结构的组件在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，且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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| Optimization Design Method of Cantilever Beam Structure of Infrared Detector-Dewar Assembly |
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| Abstract:In high-level vibration application scenarios, the cantilever beam structure of the infrared detector-dewar assembly is easily damaged. A non-contact helical spring support ring structure is designed. Between the dewar shell and the cold finger, the dewar heat leakage increased by the traditional strengthening scheme is greatly reduced through a non-contact method, and the vibration energy is converted into elastic potential energy, thereby reducing the stress impact of high-level vibration on the cold head. After simulation analysis and optimization with Ansys software, the maximum deformation of the platinum-iridium wire is 1.7 mm, which is 57.5% lower than the conventional structure; the maximum stress decreases by 52% to 307 MPa. Experimental results show that the average heat leakage after optimization increased by only 1%, while having significantly improved vibration resistance. The assemblies with conventional structures would experience platinum-iridium wire breakage after enduring 15 grms durable random vibration, while the optimized assemblies can withstand 15 grms durable random vibration and 17.6 grms short-term high-level random vibration. The optimized assemblies keep the detector focal plane temperature stable during 17.6 grms random vibration without affecting their normal operation. |
| keywords:infrared detector dewar vibration helical spring support ring cantilever beam |
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