微振动激励作用下编组站镜架对光束指向的影响

 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0.338，0.327，0.289，0.241 mrad，均小于稳定性指标0.460 mrad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0.340 mrad，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。

Influences of switchyard mirror mount on beam direction under micro vibration excitation

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 mrad, 0.327 mrad, 0.289 mrad and 0.241 mrad, all less than the required stability index of 0.460 mrad. The error between analysis result and measurement one is 0.6%, which indicates that the analysis result is reasonable.