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地脉动环境下反射镜架系统的镜片转角响应计算
Analysis on rotation angle of mirror in reflector system under ground random vibration
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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.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 reflec-tor system is built in ANSYS,the modal analysis and the micro-vibration calculations are done on the FE model.The RMS rota-tion angle of the mirror is calculated according to the simulation result.At the same time,another engineering approach to calcu-late 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.
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