非线性摄动时滞系统故障诊断  

Fault Diagnosis for Time-Delay Systems with Nonlinear Perturbations

作　　者：杨小波[1] 石红瑞[1] 

机构地区：[1]东华大学信息科学与技术学院,上海201620

出　　处：《东华大学学报（自然科学版）》2009年第4期459-462,共4页Journal of Donghua University(Natural Science)

摘　　要：针对一类含有未知输入和非线性摄动的状态时滞系统,采用基于自适应观测器的故障诊断系统的设计方法,以线性矩阵不等式的形式给出此问题解的存在条件及求解算法,并论证了系统的鲁棒稳定性,给出了对故障检测具有高灵敏度、零误报率的阈值判断公式.设计的自适应观测器具有双重功能:首先作为故障检测观测器能够检测出故障的发生,然后作为故障诊断观测器能够理想地估计出故障随时间的变化曲线.此算法既能诊断突变故障,又能诊断缓变故障.仿真结果表明算法具有良好的诊断性能.A fault diagnosis approach based on an adaptive observer was proposed for state delay systems with both nonlinear perturbations and unknown inputs. The sufficient condition for the existence of observer and its design method was presented in terms of linear matrix inequality. System robust stability was proofed. Threshold selection for fault detection was proposed with high sensitivity and zero false alarm rate. The proposed adaptive observer can server a dual purpose： first as a detection observer to detect fault, then as a diagnostic observer to approximate the change curve of fault by time ideally. The method can diagnose both the abrupt fault and soft fault. Simulation results demonstrate the effectiveness of the proposed approach.

关 键 词：非线性摄动 时滞系统 自适应观测器 故障诊断 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]