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短距起飞/垂直降落(STOVL)飞机发动机已采用多变量控制方法。基于鲁棒稳定性和条件数分析、块相对增益矩阵分析,对STOVL飞机发动机不同工作模式下的三变量控制系统输出选择和控制结构设计进行了研究。对常规工作模式,提出了基于多目标优化的三变量分块解耦控制方法,通过定义最优指标实现动态跟踪和分块间的耦合抑制。对常规工作模式和垂直起降工作模式间的切换,提出基于升力风扇功率前馈的复合控制方法,以消除负载变化对系统性能的影响。仿真结果表明:提出的控制方法能够保证常规工作模式下良好的解耦控制效果,能够实现不同工作模式间的平稳过渡,验证了控制方法的可行性。
Multi-variable control of aircraft has been adopted for STOVL aircraft. Based on the analysis of robust stability and conditional number, matrix analysis of block relative gain, the output selection and control structure design of three-variable control system under different operating modes of STOVL aircraft engine are studied. For the conventional work mode, a three-variable block decoupling control method based on multi-objective optimization is proposed. By defining the optimal index, the dynamic tracking and the coupling restraint between blocks are achieved. For the switching between the normal working mode and the vertical working mode, a composite control method based on the power feedforward of the lift fan is proposed to eliminate the influence of the load variation on the system performance. The simulation results show that the proposed control method can ensure a good decoupling control effect under normal operation mode and achieve a smooth transition between different operation modes, and verify the feasibility of the control method.