Design of anti-high-overload structure of passive semi-strapdown stabilization platform
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摘要: 针对制导炮弹内部半捷联稳定平台在只有轴承承担高过载时，轴承容易被破坏的问题，设计一种基于对顶半球的半捷联稳定平台抗高过载结构。以半捷联稳定平台工作原理和抗高过载设计要求为基础，设计了基于对顶半球的抗高过载结构，选择所用材料，进行有限元仿真分析；最终制造出该结构并进行地面半物理试验验证。仿真与试验结果表明，半捷联稳定平台在受到高过载时，该结构能起到有效的防护作用，大大减小了轴承的轴向受力，保证了轴承的正常运转，可以确保稳定平台的有效测量。惯性测量系统稳定可靠工作时所承受的过载可达11 000g，具有一定的工程应用价值。Abstract: Aiming at the high-g launching overload of the guided ammunition, the semi-strapdown stabilization platform in the shell is easily damaged when only the bearing bears axial high overload, the " counter-top hemisphere” structure was designed. Based on the analysis of the working principle and anti-overload design requirements of the semi-strapdown stabilization platform, this study analyzed the forces situation of " counter-top hemisphere” structure, the materials used were selected, and the finite element simulation analysis was performed. Finally, the structure was manufactured, and it was verified by semi-physical test. It was shown that when the semi-strapdown stabilization platform is subjected to high overload, the structure can play an effective protective role, when projectile and the internal semi-strapdown stabilization platform is under high overload condition, and provides the foundation forattitude measurement of theprojectile. The anti-high-overload buffer structure supports a stable and reliable working environment for the inertial measurement system, which has engineering application value. The inertial measurement system can still work stably and reliably when overload reaches 11 000g. The design has engineering application value.
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图 1 被动式半捷联稳定平台组成原理图
Figure 1. Schematic diagram of the semi-strapdown roll stability platform
图 5 前压螺与前半球示意图
Figure 5. Schematic diagram of front pressure screw and forward hemisphere
图 10 前半球在不同载荷作用下的形变量分布云图
Figure 10. The distribution of deformation of the front hemisphere under different loads
图 11 12 000g作用下后半球的变形量分布云图
Figure 11. Deformation distribution of the posterior hemisphere under the action of 12 000g
图 14 过载后抗高过载结构各部件状态图
Figure 14. Each part of anti-high-overload of structure after overload
图 15 11 000g过载下MIMU加速度传感器输出电压曲线
Figure 15. Output voltage curves by accelerometer of MIMU at 11 000g
图 16 11 000g过载下MIMU陀螺仪输出电压曲线
Figure 16. Output voltage curves by gyroscope of MIMU at 11 000g
表 1 模型材料的基本属性
Table 1. The basic properties of the model material
材料 密度/(kg·m−3) 弹性模量/GPa 泊松比 屈服强度/MPa 切变模量/GPa 45#钢 7 850 206 0.269 355 79.4 30CrMnSi 7 850 210 0.28 800 82 
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表 2 不同轴向过载作用下载荷力分布情况
Table 2. Load distribution under different axial overload
序号 过载/g 载荷力/N 1 5 000 49 000 2 8 000 78 400 3 10 000 98 000 4 12 000 117 600
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表 3 不同载荷下前半球的轴向变形量（μm）
Table 3. Axial deformation of forward hemisphere at different loads (μm)
5 000g 8 000g 10 000g 12 000g 56.79 90.86 113.58 136.29
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表 4 轴承游隙
Table 4. Bearing clearance
轴承类型 公称内径/mm 游隙等级（C0或CA级）/μm 最小 最大 深沟球轴承 6～10 2 13 角接触球轴承 30～50 9 17
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