潜望式激光通信粗指向装置的多工况拓扑优化

赵瑞杰; 王春洁; 阎肃

doi:10.13700/j.bh.1001-5965.2019.0566

潜望式激光通信粗指向装置的多工况拓扑优化

doi: 10.13700/j.bh.1001-5965.2019.0566

赵瑞杰¹,
王春洁^{1, 2, ,},
阎肃¹

1.
北京航空航天大学机械工程及自动化学院, 北京 100083
2.
北京航空航天大学虚拟现实技术与系统国家重点实验室, 北京 100083

基金项目:

国家自然科学基金 51635002

详细信息

作者简介:
赵瑞杰男, 博士研究生。主要研究方向:航天结构的设计分析与优化

王春洁女, 博士, 教授, 博士生导师。主要研究方向:数字化设计与仿真分析

通讯作者:
王春洁, E-mail: wangcj@buaa.edu.cn

中图分类号: V414.19
计量
- 文章访问数: 459
- HTML全文浏览量: 69
- PDF下载量: 141
- 被引次数: 0
出版历程
- 收稿日期: 2019-11-02
- 录用日期: 2020-02-14
- 网络出版日期: 2020-11-20

Multi-working-condition topology optimization of coarse pointing mechanism for periscopic laser communication

ZHAO Ruijie¹,
WANG Chunjie^{1, 2
, ,},
YAN Su¹

1.
School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China
2.
State Key Laboratory of Virtual Reality Technology and Systems, Beihang University, Beijing 100083, China

Funds:

National Natural Science Foundation of China 51635002

More Information

Corresponding author: WANG Chunjie, E-mail: wangcj@buaa.edu.cn

摘要

摘要:
激光通信技术具有广阔的应用前景。以潜望式激光通信粗指向装置为研究对象，提出了装置的等效有限元建模方法，建立了相应的有限元模型。分别针对发射阶段和在轨工作阶段2种工况，分析了加速度载荷和温度载荷对装置性能的影响。为了提升装置的工作性能，基于多工况拓扑优化方法，对装置的主体结构进行了优化设计。优化目标为装置在2种工况下的前三阶频率加权平均值最大、镜面中心在发射阶段的变形最小和镜面在在轨工作阶段的热变形面型误差最小，约束条件为装置的质量和左、右反射镜的响应差距。利用可行方向法完成优化迭代计算，优化后，装置在2种工况下的基频得到了提高，同时镜面的中心变形及面型误差得到了降低，装置的整体性能得到了明显提升。
- 指向装置 /
- 有限元建模 /
- 结构性能 /
- 拓扑优化 /
- 多工况
Abstract:
Laser communication technology has wide application prospects. The coarse pointing mechanism for periscopic laser communication is taken as the research object. The equivalent finite element modeling method of the mechanism is proposed, and then the corresponding finite element model is established. The effects of acceleration load and temperature load on the performance of the mechanism in the launch stage and the on-orbit working stage are analyzed. The multi-working-condition topology optimization method is used to optimize the main structure of the mechanism for improving the working performance of the mechanism. The optimization objective is to maximize the weighted average of the first three order frequencies of the mechanism under launch and working conditions, minimize the mirror central deformation during launch, and minimize the mirror surface error of thermal deformation during on-orbit working. The constraints are the mass of the mechanism and the gap between the response of the left and right mirrors. The feasible direction method is used to complete the optimization iteration calculation. After optimization, the fundamental frequencies of the mechanism under two working conditions increase. The central deformation and surface error of mirrors are reduced. The overall performance of the mechanism is improved significantly.
- pointing mechanism /
- finite element modeling /
- structure performance /
- topology optimization /
- multi-working-condition

HTML全文

图 1 潜望式粗指向装置的结构组成

Figure 1. Periscopic coarse pointing mechanism structure

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图 2 反射镜的固定方式

Figure 2. Method for fixing reflection mirror

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图 3 等效轴承径-轴向刚度与圆板厚度的关系

Figure 3. Relationship between equivalent bearing diameter-axial stiffness and plate thickness

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图 4 潜望式粗指向装置有限元模型

Figure 4. Finite element model of periscopic coarsepointing mechanism

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图 5 边界条件

Figure 5. Boundary conditions

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图 6 反射镜上的测点位置

Figure 6. Position of measuring points on reflection mirror

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图 7 拓扑优化设计区域与非设计区域

Figure 7. Design area and non-design area of topology optimization

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图 8 主体结构多目标拓扑优化结果

Figure 8. Multi-objective topology optimization results of main structure

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图 9 优化后的潜望式粗指向装置主体结构

Figure 9. Main structure of optimized periscopic coarse pointing mechanism

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图 10 反射镜响应在优化前后的对比

Figure 10. Comparison of reflection mirror response before and after optimization

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图 11 优化前后工况2的镜面变形对比

Figure 11. Comparison of mirror deformation under working condition 2 before and after optimization

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图 12 优化前后工况1的第一阶振型对比

Figure 12. Comparison of first-order modes of vibration under working condition 1 before and after optimization

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表 1 优化前后前三阶频率对比

Table 1. Comparison of the first three orders frequencies before and after optimization

参数	优化前频率/Hz	优化后频率/Hz	频率变化率/%
λ₁₁	282.7	283.8	+0.4
λ₁₂	285.4	316.8	+11.0
λ₁₃	299.8	340.1	+13.4
λ₂₁	53.99	55.19	+2.2
λ₂₂	71.11	72.43	+1.9
λ₂₃	157.9	166.0	+5.1

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