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1.中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
2.中国科学院大学,北京 100049
E-mail: wuxiaoxia@ciomp.ac.cn
收稿日期:2022-09-15,
修回日期:2022-10-11,
网络出版日期:2022-12-29,
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于致远,吴小霞,王富国.大口径主镜的六杆硬点定位机构参数优化[J].光学精密工程,
YU Zhiyuan,WU Xiaoxia,WANG Fuguo.Optimal design of parameters of the six-hardpoint positioning mechanism for large aperture primary mirror[J].Optics and Precision Engineering,
于致远,吴小霞,王富国.大口径主镜的六杆硬点定位机构参数优化[J].光学精密工程, DOI:10.37188/OPE.XXXXXXXX.0001
YU Zhiyuan,WU Xiaoxia,WANG Fuguo.Optimal design of parameters of the six-hardpoint positioning mechanism for large aperture primary mirror[J].Optics and Precision Engineering, DOI:10.37188/OPE.XXXXXXXX.0001
为了保证4m口径碳化硅主镜的六杆硬点定位系统有足够高的固有频率,对六杆硬点定位机构的构型参数进行了优化设计。首先,推导了主镜六杆硬点定位系统的动力学方程和固有频率方程,建立了机构的构型参数、硬点的轴向刚度、主镜的质量和惯量与主镜系统的固有频率之间的函数关系。接着,通过有限元分析获得了用于4m碳化硅主镜定位的硬点的轴向刚度。然后,基于固有频率方程,以最大化4 m碳化硅主镜系统的一阶固有频率为目标,使用遗传算法对六杆硬点定位机构的构型参数进行优化。最后,对最优构型下的4 m碳化硅主镜系统进行了模态分析。硬点的轴向刚度为33.044 N/μm,优化后的4m碳化硅主镜系统的一阶固有频率达到30.83 Hz,相对初始值有较大提高。优化方法可以有效提高主镜六杆硬点定位系统的一阶固有频率。
In order to ensure that the six-hardpoint positioning system of the 4m silicon carbide (SiC) primary mirror has a sufficiently high natural frequency, the configuration parameters of the six-hardpoint positioning mechanism are optimized. First, the dynamic equation and natural frequency equation of the six-hardpoint positioning system of the primary mirror are derived, and the functional relationship between the configuration parameters of the mechanism, the axial stiffness of the hardpoint, the mass and inertia of the primary mirror, and the natural frequency of the system is established. Then, the axial stiffness of the hardpoint used for positioning the 4m SiC primary mirror is obtained through finite element analysis. Then, based on the natural frequency equation, with the goal of maximizing the first order natural frequency of the 4m SiC primary mirror system, the configuration parameters of the six-hardpoint positioning mechanism are optimized using genetic algorithm. Finally, the modal analysis of the 4m SiC primary mirror system under the optimal configuration is carried out. The axial stiffness of the hardpoint is 33.044 N/μm. Under the optimized configuration parameters, the first-order natural frequency of the 4m SiC primary mirror system reaches 30.83 Hz, which is greatly improved compared with the initial value. The optimization method can effectively improve the first-order natural frequency of the six-hardpoint positioning system of the primary mirror.
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