动基座光电稳定平台伺服系统中加速度反馈的实现

在动基座光电稳定平台伺服系统中引入了加速度反馈闭环以提高其动态性能。考虑准确建立动基座光电稳定平台控制对象模型难度很大,该加速度反馈闭环没有基于控制对象模型,而是通过直接测量角加速度信号来实现。仿真、分析结果表明,加速度反馈闭环的引入有效提高了伺服系统动态力矩刚度,并改善了伺服系统起动、制动性能。引入加速度反馈闭环后,动基座光电稳定平台伺服系统对摩擦力矩抑制能力明显提高;对周期性扰动抑制能力提高了9.3dB;对速度阶跃响应超调量降低了4.9%,同时过渡过程也有极大的改善。该伺服系统不仅结构简单,鲁棒性强,且有较好的通用性。

Realization of acceleration feedback for servo system of moving base optoelectronic platform

An acceleration Feedback(AFB) is introduced to the servo system to improve the dynamic performance of a moving base optoelectronic stability platform. As it is difficult to establish a model for the moving base optoelectronic platform according to a moving object,the proposed acceleration feedback is realized by measuring angle acceleration signals directly. Simulation and analysis indicate that the dynamic stiffness of servo system can be enhanced and the starting and braking performance is improved with the AFB. Experiments show that the capability of resisting friction moment is increased significantly. The capability of resisting periodic disturbance is increased by 9.3db and the overshoot of speed step response is decreased by 4.9%, while the transition process has been greatly improved.The servo system has simpler structure,higher robustness,and shows better universality.