地脉动环境下反射镜架系统的镜片转角响应计算

陈学前; 沈展鹏; 刘信恩; 胡杰

doi:10.11884/HPLPB201830.170529

地脉动环境下反射镜架系统的镜片转角响应计算

doi: 10.11884/HPLPB201830.170529

陈学前^{1, 2,},
沈展鹏^{1, 2},
刘信恩^{1, 2},
胡杰^{1, 2}

1.
中国工程物理研究院总体工程研究所, 四川绵阳 621999
2.
工程材料与结构冲击振动四川省重点实验室, 四川绵阳 621999

基金项目:

国家重大专项课题资助项目 2016YFB0201005

国家自然科学基金面上项目 11472256

国防基础科研计划资助项目 C1520110002

详细信息

作者简介:
陈学前(1975—)，男，硕士，副研究员，主要从事结构动力学分析与模型V&V研究; chenxq@caep.cn

中图分类号: TN248.1
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-28
- 修回日期: 2018-03-19
- 刊出日期: 2018-07-15

Analysis on rotation angle of mirror in reflector system under ground random vibration

Chen Xueqian^{1, 2
,},
Shen Zhanpeng^{1, 2},
Liu Xin'en^{1, 2},
Hu Jie^{1, 2}

1.
Institute of Systems Engineering, CAEP, Mianyang 621999, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, China

摘要

摘要: 反射镜组件是光机装置的重要组成部分，反射镜片的转角稳定性对光路的传输有着直接影响。针对大型光机装置中反射镜架在地脉动随机微振动下的稳定性问题，推导了镜片转角响应均方根值的计算公式。在ANSYS中建立了一个镜架结构的有限元模型，并分析了该镜架系统的模态及结构在地脉动载荷下的微振动响应。根据计算结果分析得到了镜片转角响应均方根值; 提出了工程实际中如何通过有限元分析便捷获得镜片转角响应的另一种工程方法。两种方法所得镜片转角具有较好一致性，说明所采用镜片转角计算分析方法是有效的, 为精密反射镜架的稳定性设计分析提供了有效方法。
- 反射镜架系统 /
- 转角 /
- 有限元分析 /
- 微振动
Abstract: Reflector system is an important part of the laser facility, whose rotation stability has a direct effect on the beam's propagation. Aiming at the stability problem of large-scale precision mirror mount caused by ground random vibration, the formula about the root mean square (RMS) of mirror's rotation angle is deduced. The finite element (FE) model of a reflector system is built in ANSYS, the modal analysis and the micro-vibration calculations are done on the FE model. The RMS rotation angle of the mirror is calculated according to the simulation result. At the same time, another engineering approach to calculate the RMS rotation angle of the mirror is presented by FE simulation. The results of the two approaches are consistent, which shows that the approaches to calculate rotation angle of mirror are effective and reasonable.
- reflector system /
- rotation angle /
- finite element analysis /
- micro-vibration

HTML全文

图 1 反射镜镜面示意图

Figure 1. Sketch map of reflector mirror

下载: 全尺寸图片幻灯片

图 2 反射镜镜架结构系统结构示意图

Figure 2. Sketch map of reflector system

下载: 全尺寸图片幻灯片

图 3 反射镜镜架系统有限元模型

Figure 3. FE model of reflector system

下载: 全尺寸图片幻灯片

图 4 镜架结构1~3阶模态的变形云图

Figure 4. Mode deform contours of the reflector system

下载: 全尺寸图片幻灯片

图 5 镜架结构位移响应云图(mm)

Figure 5. Displacement of the reflector system (mm)

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图 6 镜片离面位移云图(mm)

Figure 6. Off-surface displacement of the mirror (mm)

下载: 全尺寸图片幻灯片

图 7 镜面绕X轴转角响应(rad)

Figure 7. Rotation angle around X axis of mirror (rad)

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图 8 镜面绕Z轴转角响应(rad)

Figure 8. Rotation angle around Z axis of mirror (rad)

下载: 全尺寸图片幻灯片

图 9 镜面合转角响应(rad)

Figure 9. Sum rotation angle of mirror (rad)

下载: 全尺寸图片幻灯片

表 1 反射镜架系统的材料参数

Table 1. Material parameters of reflector system

material	elastic modulus /Pa	Poisson’s ratio	density /(kg·m^-3)
45# steel	2×10¹¹	0.3	7850
K9	8×10¹⁰	0.21	2510

下载: 导出CSV

表 2 镜架结构前三阶固有频率的计算结果与试验结果比较

Table 2. Comparison of the first three natural frequencies between simulation and test

mode	test result/Hz	simulation result/Hz	error/%	modal shape
1	20.940	21.471	2.536	X direction whole bend
2	22.261	22.093	-0.755	Y direction whole bend
3	41.822	41.182	-1.530	whole torsion around Z axis

下载: 导出CSV

参考文献(11)

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