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为了降低外界载荷和温度变化对二氧化碳探测仪光学系统透镜面形及共轴的影响,根据系统的特点和技术要求,对其典型透镜的支撑结构进行了研究,设计了一种径向挠性支撑结构并建立了3D实体模型。运用工程CAD分析软件,采用非线性有限元分析方法对其进行了动静刚度特性和热特性仿真分析,验证了支撑结构设计的合理性。分析结果表明,透镜结构组件的一阶固有频率为1 301 Hz;利用面型拟合,得到了各工况下镜面面形误差值为PV≤λ/10,RMS≤λ/50,偏转误差≤1″。该径向支撑结构能很好地保持透镜共轴精度,减小了温度变化对镜面变形的影响,各项结果满足设计要求,证明了结构设计的合理性。
In order to reduce the influence of external load and temperature on the lens surface shape and coaxial of CO2 detector optical system, the supporting structure of its typical lens was studied according to the characteristics and technical requirements of the system. A radial flexible support Structure and set up a 3D solid model. The engineering CAD analysis software was used to simulate the static and dynamic stiffness and thermal characteristics of the structure by using the nonlinear finite element analysis method. The rationality of the support structure design was verified. The results show that the first order natural frequency of the lens assembly is 1 301 Hz. The error of the mirror surface shape is PV≤λ / 10, RMS≤λ / 50, deflection error ≤ 1 ".The radial support structure can well maintain the lens coaxial accuracy, reduce the temperature changes on the mirror deformation, the results meet the design requirements, to prove the rationality of structural design.