连续广义系统的未知输入观测器研究

研究了在未知输入下连续广义系统的降阶观测器的设计方法,并讨论了观测器在故障检测中的应用。首先给出了连续估计器的存在条件,通过给原系统加微分反馈实现正则化,又通过解耦变换使得只有一个状态向量含有未知输入,利用其余两个不受未知输入影响的状态向量设计出观测器。然后,假设未知输入为故障信号的情况下,利用观测器的方法研究了连续广义系统的故障检测问题。仿真结果显示了满意的估计性能。

Observers for continuous generalized systems with unknown inputs

An approach to designing a reduced-order observer is presented for continuous generalized system with unknown input uncertainties,and the application of observer in fault detection is then discussed.The existent condition of the continuous estimator is given firstly.Original system is transformed into a normal system by the way of using a differential feedback control.A transformation is made such that only a state vector is affected by the unknown input.Further,an observer using the rest two states not influenced by the unknown inputs is designed.Finally,the problem of fault detection for generalized systems is discussed.The simulation result shows the satisfactory performance.