惯性约束聚变(ICF)驱动器是一个大型的光学工程, 它对内部各类光学元件及其支撑镜架在环境振动载荷激励作用下镜面扰动不能超过0.46 μrad。根据稳定性设计要求, 采用虚拟激励法及随机振动理论对装置内编组站镜架的结构设计参数进行了反演分析, 得出了镜架结构设计参数, 设计的镜架固有频率要求不能低于14.88 Hz; 采用数字式地震仪对镜架安装平台的环境随机振动载荷进行了测试, 把测试结果作为载荷, 采用有限元分析软件对设计的编组站镜架进行了分析计算, 计算结果显示镜架在环境振动载荷作用下的响应不超过0.2 μrad。计算结果表明设计的镜架满足稳定性设计要求, 同时说明根据稳定性设计要求反演镜架结构的设计参数作为设计依据是可行的。

Stability index distribution of high power solid laser facility requires that the rotation of all the optical elements in the facility can not exceed 0.46 μrad when excited by environmental random vibrations. According to the requirement of stability, back inference the nature frequency design requirement of switchyard mirror frame by pseudo excitation method and random vibration theory, which is one of the large-scale mirror frame. Back inference result is that the nature frequency of switchyard mirror frame can not smaller than 14.88 Hz. Builds the 3-D model and analyses the mode of switchyard mirror frame, the result has a good agreement with the design calculation. Using the PSD as the excitation which had been measured for 24 hours on the install base level of the mirror frame to analyze random vibration response of the mirror frame by the PSD module of ANSYS, the response result is 0.2 μrad. The result indicates that designed mirror frame can meet the requirement of stability index and also indicate that according to the back inference result design the mirror frame is feasibility at the same time.