scholarly journals Internal Leakage Fault Detection and Tolerant Control of Single-Rod Hydraulic Actuators

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Jianyong Yao ◽  
Guichao Yang ◽  
Dawei Ma
Keyword(s):  
Fault Detection ◽  
Simple Structure ◽  
Control Method ◽  
Fault Tolerant ◽  
Parameter Adaptation ◽  
Servo Systems ◽  
Hydraulic Actuators ◽  
Quadratic Lyapunov Functions ◽  
Safety And Reliability ◽  
Hydraulic Servo

The integration of internal leakage fault detection and tolerant control for single-rod hydraulic actuators is present in this paper. Fault detection is a potential technique to provide efficient condition monitoring and/or preventive maintenance, and fault tolerant control is a critical method to improve the safety and reliability of hydraulic servo systems. Based on quadratic Lyapunov functions, a performance-oriented fault detection method is proposed, which has a simple structure and is prone to implement in practice. The main feature is that, when a prescribed performance index is satisfied (even a slight fault has occurred), there is no fault alarmed; otherwise (i.e., a severe fault has occurred), the fault is detected and then a fault tolerant controller is activated. The proposed tolerant controller, which is based on the parameter adaptive methodology, is also prone to realize, and the learning mechanism is simple since only the internal leakage is considered in parameter adaptation and thus the persistent exciting (PE) condition is easily satisfied. After the activation of the fault tolerant controller, the control performance is gradually recovered. Simulation results on a hydraulic servo system with both abrupt and incipient internal leakage fault demonstrate the effectiveness of the proposed fault detection and tolerant control method.

Application of Electro-Hydraulic Servo Systems to Hot Strip Down Coilers

2012 ◽  
Vol 6 (4) ◽  
pp. 445-449 ◽  
Author(s):  
Hiroaki Kuwano ◽  
◽  
Shinichi Yokota ◽  
Keyword(s):  
Control Method ◽  
The Novel ◽  
Servo Systems ◽  
Rolling Mills ◽  
Servo Valve ◽  
Control Effectiveness ◽  
Hot Strip ◽  
Hydraulic Servo ◽  
Hot Strip Mills ◽  
Controlled Object

Many kinds of electro-hydraulic servo systems have been applied to rolling mills, such as hot strip mills, cold strip mills, and seamless tube mills, for their quick response, high power, and high positioning accuracy. However, when an electro-hydraulic servo system is applied to a hot strip down coiler, it is found that the controlled object has low natural frequency and is lightly damped, so stable control is very difficult to achieve. In order to overcome these issues, first, the optimal control theory is applied to eliminate these deficiencies [1, 2]. However, the derived control system is found to lack robustness. Control effectiveness is highly influenced by the response of servo valve and the length of the piping between the servo valve and the cylinder in particular. Finally, a novel, practical controlmethod is found and proposed in the process of adjusting the production machine. The novel control method proposed here, based on the “posicast” control proposed by O. J. M. Smith in 1957 [3], has realized a kind of dead-beat control and has been found to be robust because it uses the internal information of the controlled object.

Depth Control of an Electro-Hydraulic Servo System Based on Fractional Order PID

2012 ◽  
Vol 430-432 ◽  
pp. 1650-1654
Author(s):  
Qiang Gao ◽  
Li Jun Ji ◽  
Run Min Hou ◽  
Ji Lin Chen
Keyword(s):  
Control Method ◽  
Control Strategies ◽  
Industrial Applications ◽  
Control Performance ◽  
Tracking Accuracy ◽  
Servo Systems ◽  
Performance Indexes ◽  
Hydraulic Servo ◽  
Excellent Control ◽  
Fractional Order Pid

Electro-hydraulic servo systems (EHSS) are widely used in many industrial applications, and to determine the control strategies to exhibit high robustness and high precision remains the focus of attention. In order to improve the control performance of EHSS, a novel control method, based on fractional PID (FPID) controller, is proposed and designed for the EHSS. The transfer function of EHSS is constructed using first-principle method. The feasibility and availability of the proposed controller are examined by numerical simulation. The control performances of fractional FPID are well assessed based on performance indexes, including response time, tracking accuracy and robustness. The results of the simulation verify that FPID controller is of excellent control performance, and is suitable for the control of EHSS.

scholarly journals Decentralized Fault Detection and Fault-Tolerant Control for Nonlinear Interconnected Systems

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 591
Author(s):  
Shun Zhou ◽  
Jianjun Bai ◽  
Feng Wu
Keyword(s):  
Fault Detection ◽  
Information Exchange ◽  
Control Method ◽  
Communication Protocol ◽  
Fault Tolerant ◽  
External Disturbance ◽  
Detection Threshold ◽  
Fault Tolerant Control ◽  
Interconnected System ◽  
Detection Scheme

The nonlinear interconnected system is a complex and important system in daily production and life in general. Due to the interconnection influence between subsystems and external disturbance factors, the system is prone to failure. For this kind of system, a decentralized fault detection and fault tolerant control method is proposed here. Compared with the traditional control scheme, this paper designs a subsystem communication protocol to reduce the information exchange between subsystems. Based on this communication protocol, a fault detection scheme is then designed. Due to the existence of a fault detection threshold in this scheme, the system can detect the fault in time without missing it or having a false alarm. Under the assumed condition, the adaptive control rate is obtained by establishing the adaptive approximation model to approximate the upper bound of the fault, and the subsystem adaptively adjusts the control rate according to the fault condition, so that the system can quickly recover to stability. Finally, a simulation program is used to verify the proposed method.

scholarly journals Actuator Fault Detection and Fault-Tolerant Control for Hexacopter

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4721 ◽  
Author(s):  
Nguyen ◽  
Mung ◽  
Hong
Keyword(s):  
Fault Detection ◽  
Control Method ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Detection System ◽  
Control Strategies ◽  
Fault Tolerant Control ◽  
Actuator Faults ◽  
Actuator Failures ◽  
The One

In this paper, fault detection and fault-tolerant control strategies are proposed to handle the issues of both actuator faults and disturbances in a hexacopter. A dynamic model of a hexacopter is first derived to develop a model-based fault detection system. Secondly, the altitude control based on a sliding mode and disturbance observer is presented to tackle the disturbance issue. Then, a nonlinear Thau observer is applied to estimate the states of a hexacopter and to generate the residuals. Using a fault detection unit, the motor failure is isolated to address the one or two actuator faults. Finally, experimental results are tested on a DJI F550 hexacopter platform and Pixhawk2 flight controller to verify the effectiveness of the proposed approach. Unlike previous studies, this work can integrate fault detection and fault-tolerant control design as a single unit. Moreover, the developed fault detection and fault-tolerant control method can handle up to two actuator failures in presence of disturbances.

Robust adaptive tracking control of hydraulic actuators with unmodeled dynamics

2019 ◽  
Vol 41 (14) ◽  
pp. 3887-3898 ◽  
Author(s):  
Jingzhong Zheng ◽  
Jianyong Yao
Keyword(s):  
Tracking Control ◽  
High Performance ◽  
Rigid Body Dynamics ◽  
Structural Flexibility ◽  
Servo Systems ◽  
Hydraulic Actuators ◽  
Adaptive Tracking Control ◽  
Hydraulic Servo ◽  
Robust Adaptive ◽  
Drive Systems

Traditional control methods for precise motion control of electro-hydraulic servo systems are primarily based on rigid-body dynamics of the system. Considering that structural flexibility of the mechanical components have a certain impact on all drive systems, the neglected high-frequency dynamics caused by structural flexibility have become one of the major obstacles when developing better control performance. In this paper, a high-accuracy tracking control is concerned for hydraulic actuators with unmodeled flexible dynamics. Firstly, a damping term is utilized to counterweigh the unmodeled nonlinear flexible function and a dynamic signal is designed to control the dynamic flexible disturbance. Then, in order to process parametric uncertainties along with unmodeled flexible dynamics, an adaptive backstepping controller is proposed. The controller theoretically guarantees global bounded tracking performance via Lyapunov analysis. The experimental and simulation results illustrate the high-performance nature of the proposed controller.

Leakage fault detection in Electro-Hydraulic Servo Systems using a nonlinear representation learning approach

2018 ◽  
Vol 73 ◽  
pp. 154-164 ◽  
Author(s):  
Siavash Sharifi ◽  
Ali Tivay ◽  
S. Mehdi Rezaei ◽  
Mohammad Zareinejad ◽  
Bijan Mollaei-Dariani
Keyword(s):  
Fault Detection ◽  
Representation Learning ◽  
Learning Approach ◽  
Servo Systems ◽  
Hydraulic Servo ◽  
Nonlinear Representation

scholarly journals Finite-Time Output Feedback Control for Electro-Hydraulic Servo Systems with Parameter Adaptation

Machines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 214
Author(s):  
Luyue Yin ◽  
Wenxiang Deng ◽  
Xiaowei Yang ◽  
Jianyong Yao
Keyword(s):  
Output Feedback ◽  
Finite Time ◽  
Measurement Noise ◽  
Tracking Performance ◽  
Parametric Uncertainties ◽  
External Disturbances ◽  
Parameter Adaptation ◽  
Servo Systems ◽  
Output Feedback Controller ◽  
Hydraulic Servo

Measurement noise, parametric uncertainties, and external disturbances broadly exist in electro-hydraulic servo systems, which terribly deteriorate the system control performance. To figure out this problem, a novel finite-time output feedback controller with parameter adaptation is proposed for electro-hydraulic servo systems in this paper. First, to avoid using noise-polluted signals and attain active disturbance compensation, a finite-time state observer is adopted to estimate unknown system states and disturbances, which attenuates the impact of measurement noise and external disturbances on tracking performance. Second, by adopting a parameter adaptive law, the parametric uncertainties in the electro-hydraulic servo system can be much lessened, which is beneficial to averting the high-gain feedback in practice. Then, integrating the backstepping framework and the super-twisting sliding mode technique, a synthesized output feedback controller is constructed to achieve high-accuracy tracking performance for electro-hydraulic servo systems. Lyapunov stability analysis demonstrates that the proposed control scheme can acquire finite-time stability. The excellent tracking performance of the designed control law is verified by comparative simulation results.

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