SAT-Based On-Line Fault Isolation in Serial Systems

2009 ◽  
Author(s):  
Jinseong Jeon ◽  
Sangwon Kim ◽  
Dongkeun Lee
Keyword(s):  
Fault Isolation ◽  
On Line

scholarly journals Abnormal quality detection and isolation in water distribution networks using simulation models

2012 ◽  
Vol 5 (1) ◽  
pp. 435-453
Author(s):  
F. Nejjari ◽  
R. Pérez ◽  
V. Puig ◽  
J. Quevedo ◽  
R. Sarrate ◽  
...  
Keyword(s):  
Water Distribution ◽  
Water Distribution Network ◽  
Simulation Models ◽  
Distribution Networks ◽  
Fault Isolation ◽  
Sensitivity Matrix ◽  
Quality Detection ◽  
Fault Sensitivity ◽  
On Line ◽  
District Metered Area

Abstract. This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.

scholarly journals On-Line Fault Isolation and Localization in PLC Control

1997 ◽  
Vol 30 (18) ◽  
pp. 581-586
Author(s):  
George Fodor ◽  
Dimiter Driankov
Keyword(s):  
Fault Isolation ◽  
Plc Control ◽  
On Line

scholarly journals Robust Mpc for Actuator–Fault Tolerance Using Set–Based Passive Fault Detection and Active Fault Isolation

2017 ◽  
Vol 27 (1) ◽  
pp. 43-61 ◽  
Author(s):  
Feng Xu ◽  
Vicenç Puig ◽  
Carlos Ocampo-Martinez ◽  
Sorin Olaru ◽  
Silviu-Iulian Niculescu
Keyword(s):  
Computational Complexity ◽  
Fault Detection ◽  
Fault Tolerant ◽  
Fault Isolation ◽  
Fault Detection And Isolation ◽  
Invariant Sets ◽  
Actuator Faults ◽  
Worst Case ◽  
On Line

Abstract In this paper, a fault-tolerant control (FTC) scheme is proposed for actuator faults, which is built upon tube-based model predictive control (MPC) as well as set-based fault detection and isolation (FDI). In the class of MPC techniques, tubebased MPC can effectively deal with system constraints and uncertainties with relatively low computational complexity compared with other robust MPC techniques such as min-max MPC. Set-based FDI, generally considering the worst case of uncertainties, can robustly detect and isolate actuator faults. In the proposed FTC scheme, fault detection (FD) is passive by using invariant sets, while fault isolation (FI) is active by means of MPC and tubes. The active FI method proposed in this paper is implemented by making use of the constraint-handling ability of MPC to manipulate the bounds of inputs. After the system has been detected to become faulty, the input-constraint set of the MPC controller is adjusted to actively excite the system for achieving FI guarantees on-line, where an active FI-oriented input set is designed off-line. In this way, the system can be excited in order to obtain more extra system-operating information for FI than passive FI approaches. Overall, the objective of this paper is to propose an actuator MPC scheme with as little as possible of FI conservatism and computational complexity by combining tube-based MPC and set theory within the framework of MPC, respectively. Finally, a case study is used to show the effectiveness of the proposed FTC scheme.

Consensus-Based Evaluation for Fault Isolation and On-line Evolutionary Regeneration

2005 ◽  
pp. 12-24 ◽  
Author(s):  
Kening Zhang ◽  
Ronald F. DeMara ◽  
Carthik A. Sharma
Keyword(s):  
Fault Isolation ◽  
On Line

On-Line Fault Isolation Algorithm for Industrial Processes

2003 ◽  
Vol 36 (5) ◽  
pp. 717-722 ◽  
Author(s):  
Jan M. Kościelny ◽  
Michal Syfert
Keyword(s):  
Fault Isolation ◽  
Industrial Processes ◽  
On Line

scholarly journals Abnormal quality detection and isolation in water distribution networks using simulation models

2012 ◽  
Vol 5 (1) ◽  
pp. 67-72 ◽  
Author(s):  
F. Nejjari ◽  
R. Pérez ◽  
V. Puig ◽  
J. Quevedo ◽  
R. Sarrate ◽  
...  
Keyword(s):  
Water Distribution ◽  
Water Distribution Network ◽  
Simulation Models ◽  
Distribution Networks ◽  
Fault Isolation ◽  
Sensitivity Matrix ◽  
Quality Detection ◽  
Fault Sensitivity ◽  
On Line ◽  
District Metered Area

Abstract. This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.

A Redundancy Management Procedure for Fault Detection and Isolation

1986 ◽  
Vol 108 (3) ◽  
pp. 248-254 ◽  
Author(s):  
Asok Ray ◽  
Mukund Desai
Keyword(s):  
Fault Detection ◽  
Fault Isolation ◽  
Fault Detection And Isolation ◽  
Redundancy Management ◽  
Management Procedure ◽  
Strategic Processes ◽  
Nuclear Plants ◽  
On Line ◽  
Individual Variables ◽  
Noise Statistics

This paper presents the theoretical basis of a novel redundancy management procedure developed for fault detection and isolation (FDI) in strategic processes such as spacecraft, aircraft, and nuclear plants where multiply-redundant measurements are available for individual variables. The set of redundant measurements may comprise both direct sensor outputs and analytically derived measurements. The redundancy management procedure presented in this paper is essentially independent of the fault detection strategy and measurement noise statistics, and builds upon the concept of partitioning the set of measurements into “consistent” and “inconsistent” subsets for purposes of estimation and fault isolation, respectively. The proposed procedure is suitable for real-time applications using commercially available microcomputers and its efficacy has been verified on-line in operating nuclear reactors.

Sensor Fault Isolation Using Qualitative Quantized Modeling With Application to a 3-DOF Nonlinear Vehicle

2004 ◽  
Author(s):  
S. D’Silva ◽  
P. Pisu ◽  
A. Serrani ◽  
G. Rizzoni
Keyword(s):  
Fault Detection ◽  
Low Cost ◽  
Discrete Event ◽  
Computational Effort ◽  
Fault Isolation ◽  
Fault Detection And Isolation ◽  
Sensor Fault ◽  
Sensor Fault Detection ◽  
On Line ◽  
Nonlinear Vehicle Model

Fault detection and isolation has become one of the most important aspects in vehicle control system design. In this paper, we present a technique for single sensor fault detection and isolation in automotive on-board applications. It combines model-based diagnostics and a qualitative modeling approach. The proposed method is appealing as it shifts the computational effort from on-line to off-line, making the algorithm suitable for low-cost real-time applications. The methodology can be cast in the framework of discrete-event fault diagnosis. A depth one transition relation algorithm for qualitative identification which guarantees completeness is developed and applied to a 3-degree-of-freedom (DOF) nonlinear vehicle model. The paper concludes with preliminary simulation results showing the effectiveness of the proposed scheme.

scholarly journals Distributed On-Line System for Process Plant Monitoring

2006 ◽  
Vol 220 (2) ◽  
pp. 61-77 ◽  
Author(s):  
Q Ahsan ◽  
R. I. Grosvenor ◽  
P. W. Prickett
Keyword(s):  
User Interfaces ◽  
Fault Isolation ◽  
Area Network ◽  
Line System ◽  
Software Models ◽  
Process Plant ◽  
Frequency Domains ◽  
On Line ◽  
Sensor Signals ◽  
Medium Enterprises

This paper describes a methodology for monitoring industrial processes and plant that can be implemented cost-effectively within small-to-medium enterprises. The methodology is based on a network of 8-bit microcontrollers that communicate with each other on a controller area network bus. Ethernet connectivity is provided so that remote users can access the system on the internet. The software models developed for data acquisition nodes and the design of remote user interfaces and supervisory nodes are also explained. The system is aimed at providing specific maintenance guidance and fault identification, rather than gathering data for off-line analysis. Overly complicated processing is avoided to make real-time implementation possible, using 8-bit microcontrollers. The methodology emphasizes the use of process controller signals for fault detection and sensor signals for fault isolation. The suitability of the methodology is explored by acquiring signals from a laboratory-based process rig. Suitable monitoring techniques for the system in time and frequency domains are also discussed.

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