光电跟踪设备载车平台的重复定位精度

Re-orientation accuracy of vehicle-born photoelectric tracking equipment

为了满足光电跟踪设备车载后的使用精度要求,提出了选用3条机械支腿来支撑载车的支撑方式。首先根据车载设备的位置布局和重量,选用了两前一后的支腿安装方式,然后分析了3种工况下副车架的受力情况。这3种工况为3条支腿全部位于平地、仅后腿位于斜坡和3条支腿全部位于斜坡。在三维仿真软件MSC.PATRAN中生成有限元模型,在3点支撑状态下对模型进行变形仿真,并综合分析了3种工况下的仿真结果,以检验副车架的重复定位稳定精度。最后通过设计实验检验了副车架的重复定位稳定精度,结果显示:俯仰角的最大变化为0.2″,方位角的最大变化为0.4″,数据表明副车架的重复定位稳定精度满足使用要求,证明选用3条机械支腿来支撑载车的方案合理可行。

To meet the demands of vehicle-born photoelectric tracking equipment for performance precision,a new support approach using three mechanical legs to support a vehicle was proposed.In the approach,two legs were mounted in the front of vehicle while one leg was mounted on the back according to the layout and weight of vehicle-born equipment.Then the mechanical analysis for the vehicle frame were conducted under three conditions,which consist of that three legs were located on the float land,only the hind leg was located on the slope and three legs were located on the slope.A finite element model was established by using the commercial software MSC.PATRAN.Under the circumstance of three-point support,the deformation simulation was carried out and the simulation results for three conditions were analyzed respectively to testify the re-orientation accuracy of the vehicle frame.Finally,an experiment was designed to examine the re-orientation accuracy of the vehicle frame practically.The experimental results show that the maximum variation of pitch angle is0.2″while the maximum variation of azimuth angle is 0.4″,which satisfies the requirements of reorientation accuracy of the vehicle frame and explains the reasonability of the proposed approach.