摘要
针对应用于太赫兹(THz)超高速成像的一体式类矩形转镜,为了研究其动力学性能,对其结构进行随机振动响应分析。阐述了基于以随机基础激励为前提的随机振动响应分析方法,通过运用有限元仿真分析软件ANSYS设计了一体式类矩形转镜的有限元模型。并进行模态模块仿真分析与真实测量的结果对比,得出仿真计算与实际的数据相差小于4%,验证了建立模型的正确性和精准性。针对一体式类矩形转镜在轴向和径向随机激励下的振动响应,进行有限元随机振动响应计算。通过比较轴向激励下的随机振动实验和模拟仿真分析结果,分析了结构在加速度功率谱密度响应方面的特性,研究了转镜结构在随机振动试验中的响应。研究指出了目前设计的一些问题,通过分析总结出了初步的改进方案,对今后转镜的设计研发工作提供了重要的参考依据。
To study the dynamic performance of an integrated rectangular mirror used for THz ultra high speed imaging,a random vibration response analysis is conducted on its structure.This paper elaborates on the random vibration response analysis method based on random basic excitation,and designs a finite element model of an integrated rectangular rotating mirror using the finite element simulation analysis software ANSYS.And compared the results of modal module simulation analysis with real measurements,it is found that the difference between simulation calculation and actual data is less than 4%,which verifies the correctness and accuracy of the established model.For the vibration response of an integrated rectangular-like rotating mirror under axial and radial random excitations,finite element random vibration response calculations are performed.By comparing the random vibration experiments under axial excitation with the simulated analysis results,the probability that the rotating mirror is subjected to a stress exceeding 37.029 MPa is only 0.3%,which is far lower than the yield limit strength of the material.The study identifies some issues in the current design and summarized preliminary improvement plans through analysis,and provides important reference for future research and development of rotating mirrors.
作者
苏可诚
黄乙恩
孙帅
张维
黄华川
李泽仁
SU Ke-cheng;HUANG Yien;SUN Shuai;ZHANG Wei;HUANG Hua-chuan;LI Ze-ren(College of Engineering Physics,Shenzhen Technology University,Shenzhen 518118,China;College of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《光学与光电技术》
2025年第4期82-88,共7页
Optics & Optoelectronic Technology
基金
太赫兹万帧频超高速与高分辨成像技术研究(高精尖缺人才项目)(20231061010001)资助。
关键词
太赫兹高速成像
转镜
随机振动
基础激励
有限元
功率谱密度
THz high-speed imaging
rotating mirror
random vibration
base excitation
finite element
power spectral density
