| 胡杰.基于动力学仿真的激光器平台稳定性设计改进[J].装备环境工程,2020,17(7):16-20. HU Jie.Stability Design Improvement of Laser-device Platform Based on Dynamic Numerical Simulation[J].Equipment Environmental Engineering,2020,17(7):16-20. |
| 基于动力学仿真的激光器平台稳定性设计改进 |
| Stability Design Improvement of Laser-device Platform Based on Dynamic Numerical Simulation |
| 投稿时间：2020-03-02 修订日期：2020-04-05 |
| DOI：10.7643/issn.1672-9242.2020.07.004 |
| 中文关键词: 随机振动 相对位移 角位移 有限元 数值模拟 |
| 英文关键词:random vibration relative displacement angle displacement finite element numerical simulation |
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| 中文摘要: |
| 目的 评估某光学平台初始设计方案在随机振动条件下的稳定性是否满足设计指标，并提出设计改进方案。方法 基于随机振动条件下结构相对位移的理论研究，建立动态载荷下结构相对变形的计算方法，并采用有限元数值仿真对光学平台的镜面转角响应进行分析。结果 对初始方案的数值模拟结果表明，不满足镜面角位移小于10 μrad的指标要求，主要是因为结构的整体鼓曲模态被激发，并提出了通过增加螺栓连接改变结构对动力学特性的改进思路，目的在于通过提高结构的刚度，以提高安装平台的平整性。结论 对改进方案进行数值仿真表明，通过增加基础底部对螺栓连接，有效提高了安装平台在随机载荷下的平整性，并使得安装平台角位移响应大幅下降，为3.4 μrad，满足了设计要求。 |
| 英文摘要: |
| The paper aims to estimate whether the stability of the initial design scheme for a certain optical platform under random vibration meets the design index, and propose effective improved design schemes. Based on the theory analysis of structure relative displacement response suffering random excitation, the relative deformation calculation method under dynamic load was established, and the angle response to mirror was analyzed through finite element numerical simulation. The estimation result of original scheme indicated that the angle displacement of mirror exceeded the requirements of less than 10 μrad because the overall bulge and bending mode shape of the structure were activated. It was proposed to add bolt connection to change the dynamic characteristic of structure to enhance the stiffness of the structure and improve the flatness of the mounting platform. The numerical simulation result of improvement measure indicates that with the increase of mount bolt on baseboard, the flatness of the mounting platform is enhanced effectively, and the angle displacement of the mounting platform is reduced obviously to 3.4 μrad, which matches the design requirement. |
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