变形镜的结构参数对其疲劳寿命的影响

发布时间：2018-05-02 03:18

本文选题：自适应光学 + 变形镜　；参考：《光学学报》2017年10期

【摘要】：在自适应波前校正过程中,变形镜(DM)受驱动器循环机械驱动作用会产生疲劳累积损伤。利用DM的影响函数和最小二乘法对波前校正过程进行模拟,采用有限元方法分析了DM在波前校正过程中的应力分布,并结合Miner疲劳累积损伤理论,计算了DM的疲劳寿命。在此基础上,重点讨论了DM结构参数对影响函数和DM疲劳寿命的影响。研究结果表明,对于给定的畸变波前,当DM极头数相同时,极头采用三角形排布方式时DM的交连值最小,疲劳寿命最长;极头采用正方形排布方式时DM的交连值最大,疲劳寿命最短。此外,当极头间距增大时,DM交连值会随之减小,致使DM的疲劳寿命变长。当极头间距相同时,增大极头半径和缩短极头长度会使DM的交连值变小,DM的疲劳寿命也会变短。极头间距变化对DM疲劳寿命的影响程度大于极头半径和长度;当极头间距一定时,不同的排布方式对应的极头数目不同,DM的极头数越多,疲劳寿命就越短。
[Abstract]:In the process of adaptive wavefront correction, the fatigue cumulative damage is caused by driving the deformable mirror (DMM) by the circulatory mechanism of the driver. The influence function of DM and the least square method are used to simulate the process of wavefront correction. The stress distribution of DM in the process of wavefront correction is analyzed by finite element method, and the fatigue life of DM is calculated by combining with Miner fatigue cumulative damage theory. On this basis, the influence of DM structural parameters on the influence function and the fatigue life of DM is discussed. The results show that for the given distorted wavefront, when the number of DM poles is the same, the cross connection value of DM is the smallest and the fatigue life is the longest when the pole head is arranged in a triangular manner, and the cross-connection value of DM is the largest when the pole head is arranged in a square way. The fatigue life is the shortest. In addition, when the distance between the poles increases, the cross-connection value of DM will decrease, and the fatigue life of DM will become longer. When the distance between the poles is the same, the fatigue life of DM will be shortened by increasing the radius of the pole and shortening the length of the pole. The influence of the distance between the poles on the fatigue life of DM is greater than that of the radius and length of the polar head, and when the distance between the poles is fixed, the more the number of poles corresponding to different arrangement modes is, the shorter the fatigue life is.
【作者单位】：四川大学电子信息学院;
【基金】：科技部创新人才推进计划(2014RA4051) 苏州大学省级重点实验室开放课题(KSJ1404)
【分类号】：O439

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