Abstract
With the increasing requirement of combat range in the future war, the working range of photoelectric sensors are getting farther and farther, and line-of-sight (LOS) jitter requirement of electro-optical sighting system (EOSS) is getting higher and higher. In order to improve LOS jitter of EOSS, a new flexible gimbal designed for the multiple-degree-of-freedom photoelectric turret is proposed. On the basis of maintaining the external elevation and azimuth structure of the traditional EOSS, a flexible structure is designed to replace the traditional isolation mechanism and motion axes. The newly designed structure meets the space and weight requirements of the optical sensor components in EOSS, as well as the stabilization requirement of the system in rolling direction in automatic target identification, improves LOS jitter of the overall optical sensor system. In this paper, three flexible gimbal design schemes are proposed and compared, and the one suitable for EOSS is selected. The inherent frequency range of the flexible gimbal is determined by Simulink simulation under a certain helicopter vibration environment. The stiffness of the flexible gimbal is obtained by force and displacement decomposition transformation. Finally, an ANSYS simulation and a dynamic performance test are performed and the principle of flexible gimbal is verified.
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