参数不确定系统拓展降阶控制器设计

Design of Extended Reduced Controller of the System with Uncertainties

为解决系统参数不确定导致的降阶控制器失效问题,分析了混入部分快模态的降阶控制器控制性能.以6阶滚转驾驶仪系统为例阐明了系统参数不确定导致的系统时间尺度特性的变化,随后仿真并分析了降阶控制器设计时所需选取的状态变量及降阶控制器最高阶数.利用该阶数对应的状态变量设计了包含全部潜在慢变状态的拓展降阶控制器并仿真验证了其控制性能.结果表明,拓展降阶控制器能够保证其控制性能不低于传统的降阶控制器并对参数不确定系统表现出良好的适应性.

To avoid the control failure caused by system parameter uncertainty,we analyze the performance index of a reduced controller mixed with parts of the fast modes. We use a sixth-order roll autopilot system as an example to illustrate the timescale characteristic change caused by system parameter uncertainty. Then,we simulate and analyze the states needed to design a reduced controller and the highest order of the controller. The extended reduced controller using all potential slow modes is designed,and its control performance is verified through simulation. Results show that the control performance of the extended reduced controller is equivalent to that of the traditional reduced controller,and the proposed controller shows good adaptability for a system with uncertainties.