Research Of Re-orientation Accuracy For Large-size Vehicle-borne Laser Emission System

With the development of science and technology, land-based photoelectrictracking equipment has developed from ground-fixed to vehicle-borne. Comparedwith ground-fixed photoelectric tracking equipment, vehicle-borne photoelectrictracking equipment is more maneuverability and flexibility, lower economy cost andeasier to survive in a special time. Therefore, vehicle-borne photoelectric trackingequipment becomes one of the research hot spots of many countries.The carrier platform is work foundation of the vehicle-borne photoelectrictracking equipment and it s stability has a direct impact on the vehicle-bornephotoelectric tracking equipment s working accuracy. Research of re-orientationaccuracy for the vehicle-born photoelectric tracking equipment is carried out in thisdissertation and my work with the particular project is as follows:1, According to design requirements of the sub-frame and past designexperience, a new sub-frame with higher stiffness is designed on the basis ofmaterials, welded sections and so on.2, The vehicle-borne photoelectric tracking equipment can t own an idealworking state because of the complexity of working environment. Therefore, thesub-frame s mechanical analyses of three conditions are conducted in thisdissertation. Deformations of the carrier platform under different conditions arestudied from the viewpoint of mechanics. 3, When the vehicle-borne photoelectric tracking equipment is working in theenvironment with a higher wind speed, the carrier platform s stability can be mainlyaffected by wind loads. Under the circumstance of three-point support, it is difficultto model directly. According to finite element analysis, deflection formulas of thesub-frame are calculated.4, The stability experiment and the wind loads affecting on the carrier platformexperiment are carried out. The experimental results show that the maximumvariation of pitch angle is0.2″while the maximum variation of azimuth angle is0.4″,which proves that the re-orientation accuracy of the carrier platform is high under thecircumstance of three-point support. The wind loads experiment shows that therelative angle value of installation positions of the tracking equipment and the beamgenerator is2.8″under6class wind, which causes the error of0.3″on the alignedoptical path and compared with20″of the working accuracy requirement, the errorcan be accepted. Therefore, the photoelectric tracking equipment can be able to workwell in the environment of6class wind.