Opto-mechanical dynamics optimization of electro-optical stabilized sighting system based on data driving

Difference exists between modeling result of current electro-optical stabilized sighting system (EOSSS) and dynamics characteristics of actual structure. As a result, accurate description of optical performance of imaging system in vibration environment is relatively difficult, and then it seems complicated to improve anti-vibration characteristics efficiently through structure optimization. In order to solve these problems, a data-driven opto-mechanical dynamics optimization method is proposed in this paper. First, vibration mode and modal frequency of opto-mechanical structure are obtained through hammer hitting test and vibrator-exciting experiment. Oriented towards consistency of structural mode parameters and measured data, finite element model of EOSSS structure is acquired by iteration. Then, relationship among optical system performance and displacement of every optical element is described through optical sensitivity matrix. Linear optical model of imaging system is built and contribution of different optical element to line-of-sight (LOS) jitter is analyzed. After structural optimization of core optical elements, LOS jitter of EOSSS under vibration condition is obtained. Experimental results indicate that modal parameter error between proposed structural model and measured data is only 3.55%. Structural optimization of system based on the proposed model makes the LOS jitter of EOSSS under vibration environment reduce by 82.8%. Description of intrinsic characteristics of EOSSS structure is accurate by data-driven opto-mechanical dynamics optimization method. Therefore, structural optimization makes LOS stabilization improve dramatically under vibration condition.