主、次镜支撑技术是共光路光学系统的关键技术之一.针对在±60℃温度变化范围内工作的机载共光路光学系统,根据热膨胀系数匹配原则分别选择殷钢和ULE、钛合金和K9配对作为主、次镜及支撑结构的材料,并设计了高刚度无热化柔性支撑结构.最后,利用自研的光机联合仿真程序对主、次镜面型及整个光学系统的成像质量进行了光机一体化分析.分析结果表明:殷钢和ULE配对时,在±60℃均匀温差和 10℃轴向、径向温度梯度下,主、次镜去除离焦后面型优于(1/100)λ,整个光学系统点列图RMS半径小于艾里斑半径,相面中心波前优于(1/50)λ,MTF@63 lp/mm优于 0.45,无热化柔性支撑的一阶固有频率高达 263 Hz;钛合金和K9配对时,60℃均匀温差下系统成像指标满足使用要求,10℃轴向、径向温度下成像质量无法满足使用要求.对装调完的殷钢和ULE配对光机系统进行了低温下分辨率测试,分辨率无明显变化,说明设计及分析可行.

空间旋转多光轴系统光轴平行性影响系统指向精度且校准难度高、耗时.基于空间旋转多光轴系统光轴校准原理,获得了校准理论模型;结合实验研究,建立了高精度光轴校准方案;以机械回转轴为基准,粗调准和精调准结合,以调整传感器安装面为粗调,借助双光楔实现光学量级的精校准;先校正可见光光轴与机械回转轴的平行性,再保证激光光轴与机械回转轴的平行性,最终保证可见光光轴与激光光轴的平行性.试验结果表明,该校准方案精度高,指标优于0.1 mrad,可用于实际工程装调.

The shape of optical lightweight thin reflector possessing large flakiness ratio is always effected by wide-range temperature and harsh environment(especially at-40℃),seriously influencing the system image quality.Aiming at this problem,based on flexible support principle and thermodynamics theory, a new support structure was designed for small lightweight thin splitting reflector.The temperature adaptability of the support structure was analyzed by using finite element method ,and the low temperature tests for assembled mirror components were conducted.The result shows that the accuracy of reflector surface figure remains 0.25λ(λ=632.8 nm, peak-to-valley)at-40℃.These results demonstrate that the novel flexible supporting structure design satisfies the application environment requirements.

To study the stabilization precision and avoid deducing the complicate dynamic equation of multi-gimbal electro-optic stabilization system, a method for structure-control co-simulation using Matlab and ADAMS was developed. The step response of azimuth and elevation axes, the line-of-sight(LOS) angular velocity in inertial space under tri-axis base linear vibration ,and the LOS stabilization precision under tri-axis base angular motion of 2° and 1 Hz were studied. The simulation results and the qualitative analysis are consistent, indicating that the method is useful and can be applied for new product development.

舰载光电指向器对预定目标高精度的跟踪瞄准性能,对消除回转轴系的动不平衡量提出了更高的要求.文中基于影响系数法和动刚度理论,形成了一套光电指向器动平衡方法,并将理论方法与有限元计算相结合,完成了某型光电指向器俯仰轴系动平衡校核.结果表明:该方法有效可行,使得X向振动幅值降低90.87％,Z向振动幅值降低89.26％,取得了很好的平衡效果;减少了38.7％的配重质量,实现了系统减重,证明了所提方法的可行性与有效性.

In structural dynamic simulation analysis,the accuracy and efficiency are affected greatly by the model of screwed fittings. Aiming at the complexity and precision deficiency of current models,a modeling method for screwed fittings based on model updating was presented to use rigidity elements to replace bolts. Firstly,according to the presented method,an equivalent FE model of two shells connected with four screws was built and the relationship between the system's natural frequency and screw tightening torque was studied with modal tests. Then the model's stiffness parameters were updated based on the test results. The updating results showed that the errors between the calculated modal frequencies and the test ones are less than 2. 5% in a large tightening torque range. It was demonstrated that the presented modeling method is feasible and effective.

Through virtual prototyping of sensor combinations design,three-dimensional solid model building and finite element analysis by ANSYS during demonstration phase,the static displacement deformation sensor combination,corners were calculated,and according to modal analysis,the natural frequencies of the top five,vibration mode were calculated,the data were engineered and summarized,so qualitative and quantitative analysis was carried out to get effects of bearing parts to the consistency of the optical axis.By adjusting the optical axis and the actual laser spot after comparison,got the theoretical calculation of the deflection angle and engineering text deflection angle.The same order of magnitude and consistency of the system optical axis is much higher than large-scale system of indicators,which proved that it has forward looking.

In order to solve the problems of more deviation of optical axis and larger space occupancy induced by traditional structural method,this paper presents a CCD camera with the structure of multiple fields of view(FOVs) and fixed focal length which is based on a precision casting to cast the inner rough shape of every FOV in the casting.Through the numerical control(NC) machining and the reliable assembling and adjustment method,the parallelism and stability of optical axis for this system are guaranteed efficiently.Impact and vibration tests are carried out and the measurement results show that the optical-axis parallelism error of the multiple FOV system is less than 0.2mrad;its optical-axis stability error is less than 0.1mrad.So the structure design method is feasible and effective.It has the advantages of compact structure,lighter weight,more reliable optical-axis parallelism and stability,high reliability.