关键词: 消振电力作动器, 多电机同步控制, 并行独立控制策略, 交叉耦合控制策略, 电压冲击

Abstract:

The traditional vibration damping electric actuator adopts cross-coupling control strategy to realize the servo control of output force. However， there are coupling control items in this control strategy， which affect the rapidity and accuracy of the system response and reduces the vibration reduction efficiency of the actuator. At the same time， the impulse voltage on the Direct Current （DC） bus side cannot meet the requirements of the national military standard， which directly threatens the flight safety of the helicopter. This paper proposes a servo control system for vibration damping electric actuator using the parallel independent control strategy. Firstly， the given output force of the system is decoupled to realize the parallel and independent operation of multi-motors. Secondly， the dominant pole method and maximum sensitivity method are used to design the dynamic and steady-state characteristics and robustness of the system from the perspectives of time domain and frequency domain， respectively. Finally， an experimental platform is set up to compare the control strategies. The unitary experimental data show that the response accuracy of the system is increased by 3.6% and the response time is reduced by 40% when the direction is changed； the response accuracy is increased by 1.5% and the response time is reduced by 31% when the phase is changed； the voltage impact value on the DC bus side is reduced by 8 V. The experimental data verify the effectiveness and advantages of the parallel independent control strategy.

Key words: vibration damping electric actuator, multi-motor synchronous control, parallel independent control strategy, cross-coupling control strategy, impulse voltage