scholarly journals The Fault Tolerant Control Design of an Intensified Heat-Exchanger/Reactor Using a Two-Layer, Multiple-Model Structure

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4888
Author(s):  
Menglin He ◽  
Zetao Li ◽  
Boutaib Dahhou ◽  
Michel Cabassud
Keyword(s):  
Heat Exchanger ◽  
Chemical Engineering ◽  
Unscented Kalman Filter ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Model Structure ◽  
Multiple Model ◽  
High Heat Transfer ◽  
Highly Nonlinear

The heat-exchanger/reactor (HEX reactor) is a kind of plug-flow chemical reactor which combines high heat transfer ability with good chemical performances. It was designed under the popular trend of process intensification in chemical engineering. Previous studies have investigated its characteristics and developed its nominal model. This paper is concerned with its fault tolerant control (FTC) applications. To avoid the difficulties and nonlinearities of this HEX reactor under chemical reactions, a two-layer, multiple-model structure is proposed for designing the FTC scheme. The first layer focuses on representing the nonlinear system with a bank of local linear models while the second layer uses model banks for approaching faulty situations. Model banks are achieved by system identification, and the corresponding controller banks are designed using model predictive control (MPC). The unscented Kalman filter (UKF) is introduced to estimate the states and form the fault detection and isolation (FDI) section. Finally, the FTC simulation and validation results are presented. The idea of a two-layer, multiple-model structure presents a general framework for FTC design of complex and highly nonlinear systems, such as the HEX reactor, whose mathematical model has been created. It implements the design process in an unusual way and is also worth trying on other cases.

scholarly journals Development of a Numerical Model for a Compact Intensified Heat-Exchanger/Reactor

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 454 ◽  
Author(s):  
He ◽  
Li ◽  
Han ◽  
Cabassud ◽  
Dahhou
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Heat Exchanger ◽  
Numerical Model ◽  
Chemical Engineering ◽  
Fault Tolerant ◽  
Exothermic Reaction ◽  
Plug Flow ◽  
Chemical Reactor ◽  
High Heat Transfer

A heat-exchanger/reactor (HEX reactor) is a kind of plug-flow chemical reactor which combines high heat transfer ability and chemical performance. It is a compact reactor designed under the popular trend of process intensification in chemical engineering. Previous studies have investigated its characteristics experimentally. This paper aimed to develop a general numerical model of the HEX reactor for further control and diagnostic use. To achieve this, physical structure and hydrodynamic and thermal performance were studied. A typical exothermic reaction, which was used in experiments, is modeled in detail. Some of the experimental data without reaction were used for estimating the heat transfer coefficient by genetic algorithm. Finally, a non-linear numerical model of 255 calculating modules was developed on the Matlab/Simulink platform. Simulations of this model were done under conditions with and without chemical reactions. Results were compared with reserved experimental data to show its validity and accuracy. Thus, further research such as fault diagnosis and fault-tolerant control of this HEX reactor could be carried out based on this model. The modeling methodology specified in this paper is not restricted, and could also be used for other reactions and other sizes of HEX reactors.

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.

A hybrid robust fault tolerant control based on adaptive joint unscented Kalman filter

2017 ◽  
Vol 66 ◽  
pp. 262-274 ◽  
Author(s):  
Yashar Shabbouei Hagh ◽  
Reza Mohammadi Asl ◽  
Vincent Cocquempot
Keyword(s):  
Kalman Filter ◽  
Unscented Kalman Filter ◽  
Fault Tolerant ◽  
Fault Tolerant Control

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.

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