scholarly journals Reliability Monitoring of Fault Tolerant Control Systems with Demonstration on an Aircraft Model

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Hongbin Li ◽  
Qing Zhao ◽  
Zhenyu Yang
Keyword(s):  
Control Systems ◽  
Reliability Index ◽  
Active Fault ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Model Structure ◽  
Safety Behavior ◽  
Aircraft Model ◽  
Reliability Monitoring

This paper proposes a reliability monitoring scheme for active fault tolerant control systems using a stochastic modeling method. The reliability index is defined based on system dynamical responses and a safety region; the plant and controller are assumed to have a multiple regime model structure, and a semi-Markov model is built for reliability evaluation based on the safety behavior of each regime model estimated by using Monte Carlo simulation. Moreover, the history data of fault detection and isolation decisions is used to update its transition characteristics and reliability model. This method provides an up-to-date reliability index as demonstrated on an aircraft model.

scholarly journals A Survey on Active Fault-Tolerant Control Systems

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1513
Author(s):  
Alireza Abbaspour ◽  
Sohrab Mokhtari ◽  
Arman Sargolzaei ◽  
Kang K. Yen
Keyword(s):  
Control System ◽  
Fault Detection ◽  
Control Systems ◽  
Active Fault ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Control Performance ◽  
System Components ◽  
Active Fault Tolerant Control

Faults and failures in the system components are two main reasons for the instability and the degradation in control performance. In recent decades, fault-tolerant control (FTC) approaches have been introduced to improve the resiliency of control systems against faults and failures. In general, FTC techniques are classified into active and passive approaches. This paper reviews fault and failure causes in control systems and discusses the latest solutions that are introduced to make the control system resilient.The recent achievements in fault detection and isolation (FDI) approaches and active FTC designs are investigated. Furthermore, a thorough comparison of several different aspects is conducted to understand the advantage and disadvantages of various FTC techniques to motivate researchers to further developing FTC and FDI approaches.

Active fault-tolerant control of a double inverted pendulum

2007 ◽  
Vol 221 (6) ◽  
pp. 895-904 ◽  
Author(s):  
Z Weng ◽  
R. J. Patton ◽  
P Cui
Keyword(s):  
Inverted Pendulum ◽  
Active Fault ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Residual Vector ◽  
Pendulum System ◽  
Inverted Pendulum System ◽  
Affine Parameter ◽  
Active Fault Tolerant Control

This paper proposes an active fault-tolerant control scheme based on a gain-scheduled H∞ design strategy. Under the assumption that the effects of faults on the system can be of affine parameter dependence, a reconfigurable robust H∞ controller is developed. The resulting controller is a function of the fault effect factors, which can be derived online from the residual vector of the fault detection and isolation (FDI) mechanism. To demonstrate the effectiveness of the proposed method, a non-linear double inverted pendulum system with a fault in the motor tachometer loop is considered. The adaptive fault-tolerant controller recovers well from the unstable system with loop failure.

scholarly journals Global Fault-Tolerant Control of Underactuated Aerial Vehicles with Redundant Actuators

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Yushu Yu ◽  
Yiqun Dong
Keyword(s):  
Active Fault ◽  
Fault Tolerant ◽  
Mathematical Proof ◽  
Fault Tolerant Control ◽  
Fault Isolation ◽  
Fault Detection And Isolation ◽  
Control Approach ◽  
Aerial Vehicles ◽  
Redundant Actuators ◽  
Robust Parameter

In this paper, we consider the fault-tolerant control problem for aerial vehicles with redundant actuators. The redundant actuator brings difficulty in fault identification and isolation. Active fault-tolerant control is adopted in this paper as it can detect actuator fault. The entire proposed fault-tolerant control algorithm contains a baseline controller, the fault detection and isolation scheme, and the controller reconstruction module. A robust parameter identification method is designed to identify the torque and thrust generated by the actuators. The feasibility of isolating the fault for the redundant actuators is analyzed through mathematical proof. Through the analysis, the practical fault isolation algorithm is also proposed. Two typical aerial vehicles with redundant actuators, an eight-rotor aircraft and a hexa-rotor aircraft, are adopted in numerical simulations to verify the effectiveness of the proposed fault-tolerant control approach.

scholarly journals Active versus passive fault-tolerant control of a redundant multirotor UAV

2019 ◽  
Vol 124 (1273) ◽  
pp. 385-408
Author(s):  
M. Saied ◽  
B. Lussier ◽  
I. Fantoni ◽  
H. Shraim ◽  
C. Francis
Keyword(s):  
Fault Tolerance ◽  
Fault Detection ◽  
Active Fault ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Detection Scheme ◽  
Redundancy Management ◽  
Model Free

ABSTRACTThis paper considers actuator redundancy management for a redundant multirotor Unmanned Aerial Vehicle (UAV) under actuators failures. Different approaches are proposed: using robust control (passive fault tolerance), and reconfigurable control (active fault tolerance). The robust controller is designed using high-order super-twisting sliding mode techniques, and handles the failures without requiring information from a Fault Detection scheme. The Active Fault-Tolerant Control (AFTC) is achieved through redistributing the control signals among the healthy actuators using reconfigurable multiplexing and pseudo-inverse control allocation. The Fault Detection and Isolation problem is also considered by proposing model-based and model-free modules. The proposed techniques are all implemented on a coaxial octorotor UAV. Different experiments with different scenarios were conducted for the validation of the proposed strategies. Finally, advantages, disadvantages, application considerations and limitations of each method are examined through quantitative and qualitative studies.

scholarly journals Reliability Modeling of Fault Tolerant Control Systems

2007 ◽  
Vol 17 (4) ◽  
pp. 491-504 ◽  
Author(s):  
Hongbin LI ◽  
Qing Zhao ◽  
Zhenyu Yang
Keyword(s):  
Markov Process ◽  
Control Systems ◽  
Reliability Index ◽  
Process Model ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Reliability Evaluation ◽  
Reliability Modeling ◽  
Semi Markov Process ◽  
Hard Deadline

Reliability Modeling of Fault Tolerant Control SystemsThis paper proposes a novel approach to reliability evaluation for active Fault Tolerant Control Systems (FTCSs). By introducing a reliability index based on the control performance and hard deadline, a semi-Markov process model is proposed to describe system operation for reliability evaluation. The degraded performance of FTCSs in the presence of imperfect Fault Detection and Isolation (FDI) is reflected by semi-Markov states. The semi-Markov kernel, the key parameter of the process, is determined by four probabilistic parameters based on the Markovian model of FTCSs. Computed from the transition probabilities of the semi-Markov process, the reliability index incorporates control objectives, hard deadline, and the effects of imperfect FDI, a suitable quantitative measure of the overall performance.

Reliability Monitoring of Fault Tolerant Control Systems

2008 ◽  
Vol 41 (2) ◽  
pp. 6920-6925 ◽  
Author(s):  
Hongbin Li ◽  
Qing Zhao ◽  
Zhenyu Yang
Keyword(s):  
Control Systems ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Reliability Monitoring
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