基于辅助输入信号和冗余执行器的主动故障诊断  

Active fault diagnosis based on auxiliary signals and redundant actuators

作　　者：吕雪燕 王晶[2] 周靖林[1] LV Xue-yan;WANG Jing;ZHOU Jing-lin(College of Information Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China;College of Electrical and Control Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北京化工大学信息科学与技术学院,北京100029 [2]北方工业大学电气与控制工程学院,北京100144

出　　处：《控制与决策》2023年第1期93-102,共10页Control and Decision

基　　金：国家自然科学基金项目(61973023);北京市自然科学基金项目(4202052)。

摘　　要：针对具有模型不确定项的系统,提出一种辅助信号结合冗余执行器的主动故障检测方法来检测微小故障.首先,以提升故障灵敏度和抗干扰鲁棒性为指标,构建最优观测器得到残差信号;其次,引入辅助输入信号来增大故障系统的残差,同时构建冗余执行器来避免辅助输入信号对无故障系统的影响;然后,给出随模型不确定项变化的自适应阈值构建方法降低故障检测的保守性.所提出的主动故障检测方法对无故障系统不造成影响,当故障发生时残差迅速变化且高于阈值以实现快速检测.最后通过仿真对比验证了所提出方法的有效性.For the system with model uncertainty,an active fault detection method based on auxiliary signals and redundant actuators is proposed to detect micro faults.Firstly,the optimal observer is constructed to obtain the residual signal by improving the fault sensitivity and anti-interference robustness.Then,an auxiliary input signal is introduced to increase the residual error of the fault system.At the same time,a redundant actuator is constructed to avoid the influence of the auxiliary input signal on the fault free system.In addition,an adaptive threshold construction method is proposed to reduce the conservatism of fault detection.When the fault occurs,the residual changes rapidly and is higher than the threshold value to achieve fast detection.Finally,the simulation results verify the effectiveness of the proposed method.

关 键 词：微小故障 辅助输入信号 主动故障检测 冗余执行器 自适应阈值 互质分解 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]