Fast fault accommodation of control systems by using adaptive observer

For the two difficults based on adaptive observer-based fault accommodation,strictly positive real(SPR) condition and rapidity and accuracy of fault estimation,a linear change of coordinates is firstly introduced to relax the SPR requirement,which can be applied to a wider class of systems.Then based on the changed system,a approach is proposed to evidently improve the performance of fault estimation.By using the fault estimate,the controller is reconstructed to compensate the fault,which can guarantee the stability of systems.Finally,simulation results show the effectiveness of the proposed techniques.