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对典型的光电跟踪系统进行结构分析,提出了改善机械结构谐振频率的方法,以便提高光电跟踪系统的跟踪速度。研究了典型跟踪架的垂直轴系的结构,认为单向止推轴系沿轴向的窜动限制了扭转刚度。提出了以双向止推密珠轴系结合定心轴系的结构形式设计垂直轴系,从而有效地提高了系统的刚度,改善了系统的机械谐振频率。对改进后的跟踪架进行了模态仿真分析,并通过振动及扫频试验获得了光电跟踪系统谐振频率特性曲线。实验结果表明,系统谐振频率达到114Hz,为伺服系统实现高速跟踪时的稳定性和快速性提供了硬件基础。在舰面跟踪高速起降目标的试验中,该系统最大跟踪速度达到150(°)/s以上,加速度大于240(°)/s~2,显示其光电跟踪能力显著提升。
The structure of a typical photoelectric tracking system is analyzed and a method of improving the resonant frequency of the mechanical structure is proposed in order to improve the tracking speed of the photoelectric tracking system. The structure of a vertical shaft system of a typical tracker is studied. It is considered that the axial movement of a unidirectional thrust shaft system limits the torsional stiffness. It is proposed to design the vertical shaft system by means of the combination of two-way thrust-dense bead shaft system and centering shaft system, so as to effectively increase the rigidity of the system and improve the mechanical resonance frequency of the system. Modal simulation analysis is carried out on the improved track frame, and the resonant frequency characteristic curve of the photoelectric tracking system is obtained through vibration and sweep test. The experimental results show that the resonant frequency of the system reaches 114Hz, which provides the hardware foundation for the stability and speediness of servo system in high-speed tracking. The tracking speed of the system reaches 150 (°) / s or more and the acceleration is more than 240 (°) / s ~ 2, which shows that the tracking capability of the system is improved greatly.