【摘要】 顶点探测器是中国科学院高能所提出的首次应用于环形正负电子对撞机（CEPC）中的重要探测设备，基于顶点探测器探测精度与工作可靠性要求，顶点探测器的最大振幅需小于1μm，不满足要求将导致探测失效。采用了理论与数值模拟相结合的分析方法，利用梁的挠度计算公式分析了影响探测器刚性的主要因素，通过Fluent与瞬态结构耦合模拟计算危险工况下，空气流体激励中断再恢复时结构关键部位的振动响应，并对计算结果使用Origin可视化处理，结果表明流体流速为2 m/s时结构的最大振幅为1.29μm。通过对结构进行尺寸、形状和拓扑优化，并结合敏感性分析法分析优化措施效果，计算数据表明结构的刚度对增加两侧支撑厚度不敏感，增加支架高度对结构的刚度影响较大，形状和材料分布对结构稳定性具有决定性影响。更多还原

【Abstract】 The vertex detector, proposed by the Institute of High Energy Physics of the Chinese Academy of Sciences, is an important detection device applied for the first time in the Circular Electron Positron Collider(CEPC). Based on the precision and reliability requirements of the vertex detector, the maximum amplitude of the vertex detector needs to be less than 1 μm, as failure to meet this requirement would result in detection failure. By combining theoretical analysis with numerical simulations, the main factors affecting the rigidity of the detector are analyzed using the deflection calculation formula of beams. Through Fluent and transient structural coupling simulations under critical conditions, the vibration response of key parts of the structure is analyzed when the airflow excitation is interrupted and then restored. The computational results are processed and visualized using Origin software, indicating that the maximum amplitude of the structure is 1.29 μm when the airflow velocity is 2 m/s. By optimizing the dimensions, shape, and topology of the structure, and combining with sensitivity analysis to analyze the effectiveness of optimization measures, the computational data show that the stiffness of the structure is insensitive to the thickness increasing of the supports on both sides, while increasing the height of the brackets had a significant impact on the structure’s rigidity. The shape and material distribution had a decisive influence on the stability of the structure.更多还原