基于序列变速控制的倾转旋翼动力系统综合控制方法研究

Integrated Control Method of Tiltrotor Power System Based on Sequence Shifting Control

关键词:  倾转旋翼机  动力系统  变转速  序列变速控制  综合控制

Key words:  Tiltrotor  Power system  Variable rotor speed  Sequential shifting control  Integrated control

摘要:

为了实现倾转旋翼机旋翼变转速过程中动力系统的高品质控制，提出了基于序列变速的倾转旋翼动力系统综合控制方法。在两级变速传动机构与变速动力涡轮涡轴发动机的基础上，设计倾转旋翼序列变速控制（SSC）算法，以实现低功耗变转速控制。为解决SSC过程中涡轴发动机重新接入时动力涡轮转速下垂过大的问题，提出并设计结合自适应总距前馈与增益自调度的动力系统综合控制方法，利用发动机输出扭矩与旋翼转速的变化率适应性调节控制器增益，以达到改善动力系统响应品质的目的。结果表明：相比于同步变速控制，SSC可使换挡过程中离合器的功率耗散有效降低40%以上；相比于自适应总距前馈，带增益自调度补偿环节的动力系统综合控制方法可使序列变速过程中动力涡轮转速的下垂量减小27%以上，呈现出更优越的动态控制性能。

Abstract:

In order to achieve high-quality control of tiltrotor power system during variable rotor speed， an integrated control method of power system based on sequence shifting control algorithm is proposed. Firstly， based on the two-stage transmission and the turboshaft engine with variable-speed power turbine， the sequential shifting control （SSC） algorithm of tilt rotor is designed to realize the variable rotational speed control with low power dissipation. Then， in order to overcome the problem of large drop of power turbine speed while turboshaft engine re-engages during SSC procedure， an integrated control method combining adaptive feedforward control of collective pitch and gain self-scheduling is proposed and designed. The controller gains are adjusted adaptively through the change rates of engine output torques and main rotor speeds， so as to enhance the response quality of power system. The results demonstrate that SSC can reduce the clutch power dissipation by more than 40% effectively compared with paralleled shifting control. Meanwhile， contrast to adaptive collective pitch feedforward， the integrated control method with gain self-scheduling compensation can reduce the drop of power turbine speed by more than 27%， which proves superior dynamic control performance.