微振动激励作用下编组站镜架对光束指向的影响
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摘要
编组站是靶场光路传输系统的重要组成部分,编组站镜架的稳定性对光路的传输有着直接的影响。为了分析微振动对光束指向性的影响,采用有限元分析软件建立镜架的有限元模型,将数字式地震仪测得的镜架安装平台的速度功率谱密度函数作为载荷施加到分析模型上,计算得到了编组站光学元件(A,B,C,D)在基座微振动激励作用下的转角漂移分别为0.338,0.327,0.289,0.241μrad,均小于稳定性指标0.460μrad的要求;采用加速度传感器对光学元件A的转角漂移测试结果为0.340μrad,与分析结果的误差为0.6%,说明所采用的计算分析方法是有效的,为精密镜架的设计分析提供了有效的方法。
Switchyard is an important part of the beam propagation system,the stability of which has a direct effect on the beam's propagation.A model of the switchyard mirror mount is built by the finite element analysis software,a digital seismograph is adopted to measure the micro vibration of the mirror mounts' install base,the processed velocity power spectra are used as the loads and the beam direction of each optical elements is studied.The rotations of four optical elements of the switchyard are 0.338 μrad,0.327 μrad,0.289 μrad and 0.241 μrad,all less than the required stability index of 0.460 μrad.The error between analysis result and measurement one is 0.6%,which indicates that the analysis result is reasonable.
Switchyard is an important part of the beam propagation system,the stability of which has a direct effect on the beam's propagation.A model of the switchyard mirror mount is built by the finite element analysis software,a digital seismograph is adopted to measure the micro vibration of the mirror mounts' install base,the processed velocity power spectra are used as the loads and the beam direction of each optical elements is studied.The rotations of four optical elements of the switchyard are 0.338 μrad,0.327 μrad,0.289 μrad and 0.241 μrad,all less than the required stability index of 0.460 μrad.The error between analysis result and measurement one is 0.6%,which indicates that the analysis result is reasonable.
引文
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[2]周忆,张军伟,冯斌,等.数字地震仪在精密装置支撑结构微振动分析中的应用[J].四川大学学报(工程科学版),2006,38(6):144-147.(Zhou Y,Zhang J W,Feng B,et al.The application of digital seismograph in the microvibration analysis of the precision optical equipment.Journal of Sichuan University(Engineering Science Edition),2006,38(6):144-147)
[3]杜平安,甘娥忠,于亚婷.有限元法———原理、建模及应用[M].北京:国防工业出版社,2004.(Du P A,Gan E Z,Yu Y T.Finite elementmethod:theory,model building and application.Beijing:National Defence Industry Press,2004)
[4]徐永成,陈循,温熙森.机械系统建模与动态分析[M].北京:科学出版社,2004.(Xu Y C,Chen X,Wen X S.Mechanical system modelbuilding and dynamic analysis.Beijing:Science Press,2004)
[5]金斯伯格J H,白化同,李俊宝.机械与结构振动:理论与应用[M].北京:中国宇航出版社,2005.(Ginsberg J H,Bai H T,Li J B.Mechani-cal and structural vibrations theory and application.Beijing:China Astronautic Publishing House,2005)
[6]刘宏伟,张芹,丁亚林,等.基于有限元分析的长条状主镜支撑结构设计[J].光学精密工程,2003,11(6):555-559.(Liu H W,Zhang Q,Ding Y L,et al.Design of strip primary mirror supporting structure based on finite element analysis.Optics and Precision Engineering,2003,11(6):555-559)
[7]Zhang J W,Zhou Y,Wu C X,et al.Research on stress-free design of large aperture optical reflector[C]//International Conference on Mod-el Transformation.2006,9:1170-1173.
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