Fault prediction for sandwich systems with backlash based on robust observer
Author(s): ZHOU Zu-peng, TAN Yong-hong, School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, College of Information, Mechanical and Electrical Engineering, Shanghai Normal University
Pages: 753-761
Year: 2015 Issue: 6
Journal: Control Theory & Applications
Keyword: robust observer; backlash; sandwich system; fault prediction;
Abstract: In the practical application,realizing the accurate fault prediction of non-smooth sandwich system with backlash which widely exists in the real engineering systems is of great importance.Therefore,a novel dynamic robust observer is proposed in this paper.First,the non-smooth sandwich system with backlash is transformed into a system in which the conventional dynamic robust observer design method can be applied by converting the non-smooth item into a general disturbance.Then,by zeros assignment and minimizing the(H∞,f/H-,f) indicator on the basic operation zone,the feedback matrices of this observer can be obtained.Finally,the simulation results are presented.The comparison between the proposed robust non-smooth scheme and the conventional method demonstrates that the proposed robust fault detection approach can detect the actuator and sensor faults accurately and rapidly while the conventional observer cannot detect the fault at all.Moreover,the missing and false alarms are effectively reduced by the robust observer.
Pages: 753-761
Year: 2015 Issue: 6
Journal: Control Theory & Applications
Keyword: robust observer; backlash; sandwich system; fault prediction;
Abstract: In the practical application,realizing the accurate fault prediction of non-smooth sandwich system with backlash which widely exists in the real engineering systems is of great importance.Therefore,a novel dynamic robust observer is proposed in this paper.First,the non-smooth sandwich system with backlash is transformed into a system in which the conventional dynamic robust observer design method can be applied by converting the non-smooth item into a general disturbance.Then,by zeros assignment and minimizing the(H∞,f/H-,f) indicator on the basic operation zone,the feedback matrices of this observer can be obtained.Finally,the simulation results are presented.The comparison between the proposed robust non-smooth scheme and the conventional method demonstrates that the proposed robust fault detection approach can detect the actuator and sensor faults accurately and rapidly while the conventional observer cannot detect the fault at all.Moreover,the missing and false alarms are effectively reduced by the robust observer.
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