Analysis and research on image jitter of airborne infrared turret under low temperature
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摘要: 针对某机载红外转塔在低温环境下会产生像面抖动的现象，分析了引起像面抖动的主要因素，通过建立模型、热力学分析和静力分析，得出在低温环境下俯仰支架变形量最大为0.34 mm，承受加速度过载下变形最大为0.46 mm。通过对俯仰支架进行调整、固化形态，使俯仰组件低温转动平滑，应力变形量在0.05 mm以内。同时对旋变布线方式及电机电刷安装位置提出了改进措施并给出了控制数据，解决了某机载红外转塔低温像面抖动问题。Abstract: According to the image jitter of airborne infrared turret under low temperature, the main factors inducing the image jitter are analyzed.Through modeling, thermodynamic analyzing and statics analyzing, the max deflection of the pitch stents is 0.34 mm under low temperature, and is 0.46 mm under acceleration overload.By assembling the pitch stents and solidifying the configuration, deflection of the pitch stents is controlled less in 0.05 mm, which makes the pitch stents turn smoother.Moreover, improvement measures are proposed for spin wiring mode and motor brush installation location and control data is provided, which solves the problem of image jitter of airborne infrared turret under low temperature.
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Keywords:
- weak rigidity /
- lag at low temperature /
- image jitter /
- thermodynamic analysis /
- statics analysis
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图 3 俯仰支架固有频率及对应振型
Figure 3. Inherent frequency and corresponding vibration mode of pitch stents
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图 7 左右安装孔不平行性矫正
Figure 7. Correction of parallel misalignment of left and right mounting holes
表 1 俯仰支架平行度
Table 1 Parallelism of pitch stents
编号 23℃平行度/mm -40℃平行度/mm 1 0.05 0.17 2 0.09 -0.26 3 0.04 -0.30 4 0.06 0.28 5 0.06 0.32 
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表 2 镁合金材料属性
Table 2 Material properties of magnesium alloy
材料 镁合金 密度 1 800 弹性模量 45 GPa 泊松比 0.35 热膨胀系数 2.6×10-5
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表 3 电流波动量
Table 3 Current fluctuation
标示 通电电压/V 电流波动量/A 1 2 0.03 2 2 0.02 3 2 0.05 4 2 0.01 5 2 0.04
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表 4 低温下俯仰支架变形量俯仰与电机电流波动量
Table 4 Deflection of pitch stents at low temperature and current fluctuation of motor
编号 俯仰支架变形量/mm 俯仰电机电流波动量/A 1 0.02 0.007 2 0.04 0.010 3 0.03 0.008 4 0.03 0.009 5 0.02 0.008
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表 5 后期10台产品环境试验考核结果
Table 5 Result of environmental test of the later 10 products
编号 1 2 3 4 5 6 7 8 9 10 低温环境下连续工作4 h 正常 正常 正常 正常 正常 正常 正常 正常 正常 正常 环境适应性 良好 良好 良好 良好 良好 良好 良好 良好 良好 良好
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