基于数字滤波器的伺服系统谐振抑制方法

针对飞行仿真伺服系统(转台)中存在的机械谐振问题,在分析传统陷波器及二阶低通滤波器谐振抑制原理的基础上,提出了一种双二次谐振抑制数字滤波器.该双二次型数字滤波器结合了传统陷波器和二阶低通滤波器的特点,能够将谐振点和反谐振点同时抑制.通过理论分析与仿真验证相结合的方式,阐述了该双二次型数字滤波器能够同时抑制正反谐振点的原理,并将该滤波器加入到了转台系统中进行实验.实验结果表明,所设计的滤波器在提高跟踪精度的同时有效拓宽了系统的带宽.

Resonance suppression method based on digital filter for servo system

According to mechanical resonance problem in flight simulation servo system (turntable system), the principles of resonance suppression about traditional notch filter and second-order low-pass filter were analyzed. Afterwards the two-second resonance suppression digital filter was proposed. The two-second digital filter combines the characteristics of traditional notch filter and second-order low-pass filter, and it can suppress the resonance point and the anti-resonance point at the same time. Through theoretical analysis and simulation combination, the principle of the two-second digital filter restraining the resonance point and the anti-resonance point simultaneously was explained. The experiments were also conducted, in which above all filters were joined into the turntable system respectively. Experimental results show that, the proposed filter ensures high tracking precision meanwhile effectively widens the bandwidth of the servo system.