两回路驾驶仪加速度计杠杆效应研究

Study on Lever Effect of Accelerometer in Two-loop Autopilot

基于极点配置设计的两回路驾驶仪,分别从快速性和稳定性角度分析了加速度计杠杆效应对驾驶仪性能的影响,且借助根轨迹和反馈分析等方法阐明了影响机理。从快速性角度分析,发现正杠杆效应可大幅减缓驾驶仪无阻尼自振频率随开环增益的增大趋势,使得在工程舵机允许频带内两回路驾驶仪不通过在前向通道引入校正网络可实现高增益;从稳定性角度分析,发现正杠杆效应可提高驾驶仪整个反馈回路的相位裕度。因此,工程上可根据设计需要采用加速度计前置的手段来改善导弹控制系统的快速性或稳定性。最后,借助仿真实例验证了分析结论的正确性。

Based on the pole assignment, the influence of performance was analyzed and the principle on rapidity and stability was clarified with the methods of root locus and feedback. It is concluded that the positive lever effect obviously decreases the velocity of frequency of autopilot, which varies along with the open loop gain. Hence, a two-loop autopilot with a high gain can be designed without compensation net- work. Or it can enhance the stability. So it is a method that the accelerometer is fixed before the gravity to improve performance of autopilot. The simulation result shows that the conclusion is proper and impor- tant.