33 results on '"ROBUST control"'
Search Results
2. Robust Preview Control for Uncertain Discrete Singular Systems.
- Author
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Wu, Jiang, Liao, Fucheng, Shao, Yifan, Gao, Shujie, Wang, Hao, and Xu, Zhengguang
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ROBUST control , *LINEAR matrix inequalities , *COMPUTER simulation , *CONTROL theory (Engineering) , *MATHEMATICAL models - Abstract
In this paper, the problem of robust preview control for uncertain discrete singular systems is considered. First of all, by employing the forward difference for uncertain discrete singular systems, the singular augmented error system with the state vector, the input control vector, and the previewable reference signal is derived. Since there is a singular matrix in the system, the existing method cannot be directly applied to this problem. By considering the stability of the transposition system with Linear Matrix Inequality (LMI) method, a new stability criterion for the transposition system is introduced. Then, the robust controller for the augmented error system is obtained, which is regarded as the robust preview controller for the original singular system. At last, the numerical simulation shows the correctness and effectiveness of the results. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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3. Robust Output Control of an Uncertain Underactuated 2DOF Mass-Spring-Damper System with Backlash Based on Active Disturbance Rejection Control Structure.
- Author
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Mario Mora, C., David Rosas, A., Raul Rascon, C., and Ricardo Cuesta, G.
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DAMPERS (Mechanical devices) , *DEGREES of freedom , *ROBUST control , *PERTURBATION theory , *CLOSED loop systems , *COMPUTER simulation - Abstract
We propose a strategy to solve the tracking and regulation problem for a 2DOF underactuated mass-spring-damper system with backlash on the underactuated joint, parametric uncertainties, and partial measurement of the state vector. The design of the controller is divided into two stages; in the first stage, it is assumed that the full state vector and all perturbations in the system are available. The model is divided into one actuated subsystem and one underactuated subsystem. The position of the actuated mass is defined as the control input of the underactuated subsystem, which is designed as an ideal controller that solves the tracking and regulation control problems for the underactuated mass. Finally, the control input of the actuated subsystem is designed to solve the tracking problem considering as a reference signal the control signal of the underactuated subsystem. The second stage solves the problem of the implementation of the previously designed ideal controller using the active disturbances rejection control structure (ADRC). Here state observers estimate the nonmeasured state variables and, at the same time, estimate perturbations and auxiliary signals for their compensation. The performance of the closed-loop system is illustrated by numerical simulations and experimental results. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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- View/download PDF
4. Robust Observer-Based H∞ Controller Design for Motorcycle Lateral Dynamics.
- Author
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Ferjani, A., Zaidi, I., and Chaabane, M.
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ROBUST control , *AUTOMATIC control systems , *MOTORCYCLE industry , *MOTORCYCLE parts , *ELECTRONIC controllers , *COMPUTER simulation - Abstract
The present work deals with the design problem of a robust observer-based controller for a motorcycle system using LPV approach. The designed model is specifically uncertain and disturbed one, whose uncertainties are related to variations of both the cornering stiffness and the longitudinal velocity. The nonlinear motorcycle model is firstly transformed on an uncertain LPV model with two vertices; then an observer-based H∞ robust controller is designed. Both the controller and observer gain matrices are computed by solving a unified convex optimization problem under LMI constraints using YALMIP solver. Numerical simulation results are given to illustrate the effectiveness of the designed method. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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5. Robust Optimal Design of Quantum Electronic Devices.
- Author
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Morales, Ociel, Periago, Francisco, and Vallejo, José A.
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ELECTRONIC equipment design , *QUANTUM electronics , *ROBUST control , *ELECTRIC potential , *COMPUTER simulation , *COEFFICIENTS (Statistics) - Abstract
We consider the optimal design of a sequence of quantum barriers, in order to manufacture an electronic device at the nanoscale such that the dependence of its transmission coefficient on the bias voltage is linear. The technique presented here is easily adaptable to other response characteristics. There are two distinguishing features of our approach. First, the transmission coefficient is determined using a semiclassical approximation, so we can explicitly compute the gradient of the objective function. Second, in contrast with earlier treatments, manufacturing uncertainties are incorporated in the model through random variables; the optimal design problem is formulated in a probabilistic setting and then solved using a stochastic collocation method. As a measure of robustness, a weighted sum of the expectation and the variance of a least-squares performance metric is considered. Several simulations illustrate the proposed technique, which shows an improvement in accuracy over 69% with respect to brute-force, Monte-Carlo-based methods. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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6. Speed Adaptive Sliding Mode Control with an Extended State Observer for Permanent Magnet Synchronous Motor.
- Author
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Xia, Peipei, Deng, Yongting, Wang, Zhiqian, and Li, Hongwen
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SYNCHRONOUS electric motors , *PERMANENT magnet motors , *SLIDING mode control , *ADAPTIVE control systems , *ROBUST control , *COMPUTER simulation - Abstract
The sliding mode control (SMC) strategy is employed to a permanent magnet synchronous motor (PMSM) vector control system in this study to improve system robustness against parameter variations and load disturbance. To decrease the intrinsic chattering behavior of SMC, a speed SMC with an adaptive law and an extended state observer (ESO) is proposed. In this method, based on the Lyapunov stability theorem, adaptive estimation laws are deduced to estimate uncertainties of a PMSM caused by parameter variations and unmodeled dynamics. Online estimated uncertainties can be used to eliminate the effect caused by the real uncertainties. In addition, an ESO is applied to observe the load disturbance in real time. The load disturbance observed value is then utilized to the output side of the speed adaptive SMC controller as feed-forward compensation. Both the simulation and experiment results demonstrate that the proposed approach effectively alleviates system chattering and enhances system robustness against uncertainty and load disturbance. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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7. Neural Networks Approximator Based Robust Adaptive Controller Design of Hypersonic Flight Vehicles Systems Coupled with Stochastic Disturbance and Dynamic Uncertainties.
- Author
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Zhu, Guoqiang, Sun, Lingfang, and Zhang, Xiuyu
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ARTIFICIAL neural networks , *HYPERSONIC planes , *ROBUST control , *STOCHASTIC analysis , *ADAPTIVE control systems , *COMPUTER simulation , *AIRPLANE design - Abstract
A neural network robust control is proposed for a class of generic hypersonic flight vehicles with uncertain dynamics and stochastic disturbance. Compared with the present schemes of dealing with dynamic uncertainties and stochastic disturbance, the outstanding feature of the proposed scheme is that only one parameter needs to be estimated at each design step, so that the computational burden can be greatly reduced and the designed controller is much simpler. Moreover, by introducing a performance function in controller design, the prespecified transient and performance of tracking error can be guaranteed. It is proved that all signals of closed-loop system are uniformly ultimately bounded. The simulation results are carried out to illustrate effectiveness of the proposed control algorithm. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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8. Energy Storage System Control for Energy Management in Advanced Aeronautic Applications.
- Author
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Cavallo, A., Canciello, G., and Guida, B.
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BATTERY chargers , *ENERGY storage , *AERONAUTICS , *ROBUST control , *ENERGY management , *MATHEMATICAL proofs , *COMPUTER simulation - Abstract
In this paper an issue related to electric energy management on board an aircraft is considered. A battery pack is connected to a high-voltage bus through a controlled Battery Charge/Discharge Unit (BCDU) that makes the overall behaviour of the battery “intelligent.” Specifically, when the aeronautic generator feeding the high-voltage bus has enough energy the battery is kept under charge, while if more loads are connected to the bus, so that the overload capacity of the generator is exceeded, the battery “helps” the generator by releasing its stored energy. The core of the application is a robust, supervised control strategy for the BCDU that automatically reverts the flow of power in the battery, when needed. Robustness is guaranteed by a low-level high gain control strategy. Switching from full-charge mode (i.e., when the battery absorbs power from the generator) to generator mode (i.e., when the battery pumps energy on the high-voltage bus) is imposed by a high-level supervisor. Different from previous approaches, mathematical proofs of stability are given for the controlled system. A switching implementation using a finite-time convergent controller is also proposed. The effectiveness of the proposed strategy is shown by detailed simulations in Matlab/Stateflow/SimPowerSystem. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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9. Decoupling Control for Dual-Winding Bearingless Switched Reluctance Motor Based on Improved Inverse System Method.
- Author
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Zhu, Zhiying, Sun, Yukun, and Yuan, Ye
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WINDING machines , *RELUCTANCE motors , *COMPUTER simulation , *NONLINEAR systems , *ROBUST control - Abstract
Dual-winding bearingless switched reluctance motor (BSRM) is a multivariable high-nonlinear system characterized by strong coupling, and it is not completely reversible. In this paper, a new decoupling control strategy based on improved inverse system method is proposed. Robust servo regulator is adopted for the decoupled plants to guarantee control performances and robustness. A phase dynamic compensation filter is also designed to improve system stability at high-speed. In order to explain the advantages of the proposed method, traditional methods are compared. The tracking and decoupling characteristics as well as disturbance rejection and robustness are deeply analyzed. Simulation and experiments results show that the decoupling control of dual-winding BSRM in both reversible and irreversible domains can be successfully resolved with the improved inverse system method. The stability and robustness problems induced by inverse controller can be effectively solved by introducing robust servo regulator and dynamic compensation filter. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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10. Multicriteria Adaptive Observers for Singular Systems with Unknown Time-Varying Parameters.
- Author
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Kwon, Wookyong, Ban, Jaepil, Han, Soohee, Lee, Chong Soo, and Won, Sangchul
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MULTIDISCIPLINARY design optimization , *TIME-varying systems , *COST functions , *COMPUTER simulation , *ROBUST control - Abstract
This paper proposes multicriteria adaptive observers for a class of singular systems with unknown time-varying parameters. Two criteria for the H∞ disturbance attenuation level and the upper bound of an ultimate invariant set are scalarized into a single cost function and then it is minimized by varying the weight parameter, which creates the optimal trade-off curve or Pareto optimal points. The proposed multicriteria adaptive observers are shown to be able to easily include integral action for better robust performance. It is demonstrated with numerical simulations that the proposed multicriteria adaptive observers provide the good estimation accuracy and allow effective and compromising design by considering two different cost functions simultaneously. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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11. Performance Analysis and Optimal Allocation of Layered Defense M/M/N Queueing Systems.
- Author
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Li, Longyue, Liu, Fuxian, Long, Guangzheng, Zhao, Huizhen, and Mei, Yingying
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BALLISTIC missile defenses , *QUEUING theory , *COMPUTER simulation , *SEARCH algorithms , *ROBUST control - Abstract
One important mission of strategic defense is to develop an integrated layered Ballistic Missile Defense System (BMDS). Motivated by the queueing theory, we presented a work for the representation, modeling, performance simulation, and channels optimal allocation of the layered BMDS M/M/N queueing systems. Firstly, in order to simulate the process of defense and to study the Defense Effectiveness (DE), we modeled and simulated the M/M/N queueing system of layered BMDS. Specifically, we proposed the M/M/N/N and M/M/N/C queueing model for short defense depth and long defense depth, respectively; single target channel and multiple target channels were distinguished in each model. Secondly, we considered the problem of assigning limited target channels to incoming targets, we illustrated how to allocate channels for achieving the best DE, and we also proposed a novel and robust search algorithm for obtaining the minimum channel requirements across a set of neighborhoods. Simultaneously, we presented examples of optimal allocation problems under different constraints. Thirdly, several simulation examples verified the effectiveness of the proposed queueing models. This work may help to understand the rules of queueing process and to provide optimal configuration suggestions for defense decision-making. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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12. Robust Fuzzy Control for Fractional-Order Uncertain Hydroturbine Regulating System with Random Disturbances.
- Author
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Wu, Fengjiao, Zhang, Guitao, and Wang, Zhengzhong
- Subjects
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HYDRAULIC turbines , *ROBUST control , *MATRICES (Mathematics) , *STABILITY theory , *FUZZY control systems , *COMPUTER simulation - Abstract
The robust fuzzy control for fractional-order hydroturbine regulating system is studied in this paper. First, the more practical fractional-order hydroturbine regulating system with uncertain parameters and random disturbances is presented. Then, on the basis of interval matrix theory and fractional-order stability theorem, a fuzzy control method is proposed for fractional-order hydroturbine regulating system, and the stability condition is expressed as a group of linear matrix inequalities. Furthermore, the proposed method has good robustness which can process external random disturbances and uncertain parameters. Finally, the validity and superiority are proved by the numerical simulations. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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13. Target Matching Recognition for Satellite Images Based on the Improved FREAK Algorithm.
- Author
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Chen, Yantong, Xu, Wei, and Piao, Yongjie
- Subjects
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REMOTE-sensing images , *ROBUST control , *COMPUTER simulation , *GAUSSIAN processes , *ALGORITHMS , *FEATURE extraction - Abstract
Satellite remote sensing image target matching recognition exhibits poor robustness and accuracy because of the unfit feature extractor and large data quantity. To address this problem, we propose a new feature extraction algorithm for fast target matching recognition that comprises an improved feature from accelerated segment test (FAST) feature detector and a binary fast retina key point (FREAK) feature descriptor. To improve robustness, we extend the FAST feature detector by applying scale space theory and then transform the feature vector acquired by the FREAK descriptor from decimal into binary. We reduce the quantity of data in the computer and improve matching accuracy by using the binary space. Simulation test results show that our algorithm outperforms other relevant methods in terms of robustness and accuracy. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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14. A Lower Extremity Exoskeleton: Human-Machine Coupled Modeling, Robust Control Design, Simulation, and Overload-Carrying Experiment.
- Author
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Guo, Qing, Li, Songjing, and Jiang, Dan
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HUMAN-machine systems , *ROBOTIC exoskeletons , *LEG , *ROBUST control , *COMPUTER simulation , *ALGORITHMS , *ACTUATORS , *ANATOMY - Abstract
A robust H∞ control method and switched control algorithm for hydraulic actuator presents in human-machine coordinated motion to solve the motion delay of lower extremity exoskeleton. After the characteristic parameters synthesis of human limb and exoskeleton linkage, the human-machine coupled motion model is constructed to estimate the appropriate hydraulic pressure, which is considered as a structural uncertainty in hydraulic model. Then the robust controller is designed to improve the robust stability and performance under the structural and parametric uncertainty disturbances. Simulation results show that, in walking mode, this robust controller can achieve a better dynamic response and aid-force efficiency than PID controller. Then, according to gait divisions of person’s limb motion, the switched control algorithm is designed to reduce the delay of exoskeleton tracking person. Finally, the experimental results show that the human-machine coordinated walk with bearing 60 kg load and squat action with no external load are realized effectively by this proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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15. Robust H∞ Control of Neutral System with Time-Delay for Dynamic Positioning Ships.
- Author
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Zhao, Dawei, Ding, Fuguang, Zhou, Lili, Zhang, Wenying, and Xu, He
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ROBUST control , *TIME delay systems , *DYNAMIC positioning systems , *COMPUTER simulation , *ENVIRONMENTAL impact analysis - Abstract
Due to the input time-delay existing in most thrust systems of the ships, the robust H∞ controller is designed for the ship dynamic positioning (DP) system with time-delay. The input delay system is turned to a neutral time-delay system by a state-derivative control law. The less conservative result is derived for the neutral system with state-derivative feedback by the delay-decomposition approach and linear matrix inequality (LMI). Finally, the numerical simulations demonstrate the asymptotic stability and robustness of the controller and verify that the designed DP controller is effective in the varying environment disturbances of wind, waves, and ocean currents. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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16. Robust Stabilization of Nonlinear Systems with Uncertain Varying Control Coefficient.
- Author
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Zaiyue Yang, Chan, C. W., and Yiwen Wang
- Subjects
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ROBUST stability analysis , *NONLINEAR systems , *ROBUST control , *CLOSED loop systems , *COMPUTER simulation , *MATHEMATICAL analysis - Abstract
This paper investigates the stabilization problem for a class of nonlinear systems, whose control coefficient is uncertain and varies continuously in value and sign. The study emphasizes the development of a robust control that consists of a modified Nussbaum function to tackle the uncertain varying control coefficient. By such a method, the finite-time escape phenomenon has been prevented when the control coefficient is crossing zero and varying its sign. The proposed control guarantees the asymptotic stabilization of the system and boundedness of all closed-loop signals. The control performance is illustrated by a numerical simulation. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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17. Robust D-Stability Controller Design for a Ducted Fan Unmanned Aerial Vehicle.
- Author
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Xiao-lu Ren, Chang-hong Wang, and Guo-xing Yi
- Subjects
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ROBUST control , *STABILITY (Mechanics) , *DRONE aircraft , *AERODYNAMICS , *COMPUTER simulation , *FEASIBILITY studies - Abstract
This paper deals with the aerodynamic modeling of a small ducted fan UAV and the problem of attitude stabilization when the parameter of the vehicle is varied. The main aerodynamic model of the hovering flight UAV is first presented. Then, an attitude control is designed from a linearization of the dynamic model around the hovering flight, which is based on the H∞ ∞ output feedback control theory with D-stability. Simulation results show that such method has good robustness to the attitude system. They can meet the requirements of attitude control and verify further the feasibility of such a control strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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18. Robust Switching Control Strategy for a Transmission System with Unknown Backlash.
- Author
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Qiang Ling, Zhe Yan, Honghai Shen, Jiquan Li, and Yongyang Wang
- Subjects
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ROBUST control , *BACKLASH (Engineering) , *DATA transmission systems , *NONLINEAR theories , *COMPUTER simulation , *SIGNAL processing - Abstract
This paper proposes a robust switching control strategy for a transmission system with unknown backlash. Firstly, the adverse effects of backlash nonlinearity in the transmission system are analyzed. Then the backlash model and different operating modes of the transmission system with backlash are investigated. For each operating mode, an individual controller is designed to make the system robust against the unknown backlash and various frequencies of the input signal. Moreover, a supervisory controller is proposed to estimate the current mode of the transmission system and coordinate the controller switching between different modes. Simulations are done to verify that our switching control strategy can efficiently reduce the oscillation caused by backlash and is quite robust against the variation of the frequency of the input signal. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
19. Performance Analysis of an Environmental Adaptive CFAR Detector.
- Author
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Sung Won Hong and Dong Seog Han
- Subjects
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CONSTANT false alarm rate (Data processing) , *MATHEMATICAL analysis , *ROBUST control , *COMPUTER simulation , *HOMOGENEOUS spaces - Abstract
The constant false alarm rate (CFAR) is a detection algorithm that is generally used in radar or sonar systems, but its performance depends greatly on the environment. This means that the detection performance cannot be satisfied with only a single CFAR detector. This paper evaluates mathematically a proposed environmental adaptive (EA) CFAR detector. The proposed CFAR detector selects an optimal CFAR detector depending on the environment. Computer simulations validate the mathematical analysis and robustness of the detector in homogeneous and nonhomogeneous backgrounds. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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20. A Hybrid Scheme Motion Controller by Sliding Mode and Two-Degree-of-Freedom Controls to Minimize the Chattering.
- Author
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Chiu-Keng Lai
- Subjects
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SLIDING mode control , *MOTION control devices , *COMPUTER simulation , *ROBUST control , *DEGREES of freedom , *CHATTERING control (Control systems) - Abstract
Sliding mode control (SMC) is rapped for the chattering due to high gain control. However, high gain control causes the system robust. For developing a system with robustness of SMC, a servo motor motion controller combining the two-degree-of-freedom (2DOF) system and SMC is proposed. The discussed motion type is point-to-point control with the constraint of trapezoid velocity profile. SMC is designed to guide the motor motion to follow a predefined trail, and the inner 2DOF system is used to compensate the deterioration due to the adoption of load observer. The proposed hybrid system is realized on a PC-based motion controller, and the validness is verified by simulation and experimental results. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
21. Node-Dependence-Based Dynamic Incentive Algorithm in Opportunistic Networks.
- Author
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Ruiyun Yu and Pengfei Wang
- Subjects
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COMPUTER network reliability , *ALGORITHMS , *NETWORK performance , *COMPUTER simulation , *ROBUST control - Abstract
Opportunistic networks lack end-to-end paths between source nodes and destination nodes, so the communications are mainly carried out by the "store-carry-forward" strategy. Selfish behaviors of rejecting packet relay requests will severely worsen the network performance. Incentive is an efficient way to reduce selfish behaviors and hence improves the reliability and robustness of the networks. In this paper, we propose the node-dependence-based dynamic gaming incentive (NDI) algorithm, which exploits the dynamic repeated gaming to motivate nodes relaying packets for other nodes. The NDI algorithm presents a mechanism of tolerating selfish behaviors of nodes. Reward and punishment methods are also designed based on the node dependence degree. Simulation results show that the NDI algorithm is effective in increasing the delivery ratio and decreasing average latency when there are a lot of selfish nodes in the opportunistic networks. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
22. Enhanced PID Controllers Design Based on Modified Smith Predictor Control for Unstable Process with Time Delay.
- Author
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Chengqiang Yin, Jie Gao, and Qun Sun
- Subjects
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PID controllers , *ROBUST control , *TIME delay systems , *DEGREES of freedom , *COMPUTER simulation - Abstract
A two-degree-of-freedom control structure is proposed for a class of unstable processes with time delay based on modified Smith predictor control; the superior performance of disturbance rejection and good robust stability are gained for the system. The set-point tracking controller is designed using the direct synthesis method; the IMC-PID controller for disturbance rejection is designed based on the internal mode control design principle. The controller for set-point response and the controller for disturbance rejection can be adjusted and optimized independently. Meanwhile, the two controllers are designed in the form of PID, which is convenient for engineering application. Finally, simulation examples demonstrate the validity of the proposed control scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
23. Robust Switched Predictive Braking Control for Rollover Prevention in Wheeled Vehicles.
- Author
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Rodríguez Licea, Martín Antonio and Cervantes, Ilse
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AUTOMOBILE brakes , *ROLLOVER vehicle accidents , *ELECTRONIC controllers , *COMPUTER simulation , *ROBUST control - Abstract
The aim of this paper is to propose a differential braking rollover mitigation strategy for wheeled vehicles. The strategy makes use of a polytopic (piecewise linear) description of the vehicle and includes translational and rotational dynamics, as well as suspension effects. The braking controller is robust and the system states are predicted to estimate the rollover risk up to a given time horizon. In contrast to existing works, the switched predictive nature of the control allows it to be applied only when risk of rollover is foreseen, interfering a minimum with driver's actions. The stability of the strategy is analyzed and its robustness is illustrated via numerical simulations using CarSim for a variety of vehicles. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
24. Adaptive Robust Actuator Fault Accommodation for a Class of Uncertain Nonlinear Systems with Unknown Control Gains.
- Author
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Yuefei Wu, Dawei Ma, Jianyong Yao, Guigao Le, Zhenxing Mu, and Fan Yang
- Subjects
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ACTUATORS , *ROBUST control , *FAULT tolerance (Engineering) , *UNCERTAINTY (Information theory) , *NONLINEAR systems , *COMPUTER simulation - Abstract
An adaptive robust fault tolerant control approach is proposed for a class of uncertain nonlinear systems with unknown signs of high-frequency gain and unmeasured states. In the recursive design, neural networks are employed to approximate the unknown nonlinear functions, K-filters are designed to estimate the unmeasured states, and a dynamical signal and Nussbaumgain functions are introduced to handle the unknown sign of the virtual control direction. By incorporating the switching function σ algorithm, the adaptive back stepping scheme developed in this paper does not require the real value of the actuator failure. It is mathematically proved that the proposed adaptive robust fault tolerant control approach can guarantee that all the signals of the closed-loop system are bounded, and the output converges to a small neighborhood of the origin. The effectiveness of the proposed approach is illustrated by the simulation examples. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
25. Design of Nonlinear Robust Rotor Current Controller for DFIG Based on Terminal Sliding Mode Control and Extended State Observer.
- Author
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Guowei Cai, Cheng Liu, Deyou Yang, and Nantian Huang
- Subjects
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NONLINEAR theories , *ROBUST control , *ROTORS , *SLIDING mode control , *COMPUTER simulation - Abstract
As to strong nonlinearity of doubly fed induction generators (DFIG) and uncertainty of its model, a novel rotor current controller with nonlinearity and robustness is proposed to enhance fault ride-though (FRT) capacities of grid-connected DFIG. Firstly, the model error, external disturbances, and the uncertain factors were estimated by constructing extended state observer (ESO) so as to achieve linearization model, which is compensated dynamically from nonlinear model. And then rotor current controller of DFIG is designed by using terminal sliding mode variable structure control theory (TSMC). The controller has superior dynamic performance and strong robustness. The simulation results show that the proposed control approach is effective. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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26. A Novel Method of Robust Trajectory Linearization Control Based on Disturbance Rejection.
- Author
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Xingling Shao and Honglun Wang
- Subjects
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FEEDBACK control systems , *CLOSED loop systems , *ROBUST control , *COMPUTER simulation , *SAMPLING errors - Abstract
A novel method of robust trajectory linearization control for a class of nonlinear systems with uncertainties based on disturbance rejection is proposed. Firstly, on the basis of trajectory linearization control (TLC) method, a feedback linearization based control law is designed to transform the original tracking error dynamics to the canonical integral-chain form. To address the issue of reducing the influence made by uncertainties, with tracking error as input, linear extended state observer (LESO) is constructed to estimate the tracking error vector, as well as the uncertainties in an integrated manner. Meanwhile, the boundedness of the estimated error is investigated by theoretical analysis. In addition, decoupled controller (which has the characteristic of well-tuning and simple form) based on LESO is synthesized to realize the output tracking for closed-loop system. The closed-loop stability of the system under the proposed LESO-based control structure is established. Also, simulation results are presented to illustrate the effectiveness of the control strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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27. Stabilization of a Class of Stochastic Nonlinear Systems.
- Author
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Ghaffari, Valiollah, Karimi, Hamid Reza, Noroozi, Navid, and Naghavi, S. Vahid
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STOCHASTIC processes , *NONLINEAR systems , *ADAPTIVE control systems , *LYAPUNOV stability , *ROBUST control , *COMPUTER simulation - Abstract
This paper addresses two control schemes for stochastic nonlinear systems. Firstly, an adaptive controller is designed for a class of motion equations. Then, a robust finite-time control scheme is proposed to stabilize a class of nonlinear stochastic systems. The stability of the closed-loop systems is established based on stochastic Lyapunov stability theorems. Links between these two methods are given. The efficiency of the control schemes is evaluated using numerical simulations. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
28. Robust Finite-Time Control for Spacecraft with Coupled Translation and Attitude Dynamics.
- Author
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Guo-Qiang Wu, Shu-Nan Wu, and Zhi-Gang Wu
- Subjects
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ROBUST control , *SPACE vehicle control systems , *ERROR analysis in mathematics , *PERTURBATION theory , *UNCERTAINTY (Information theory) , *COMPUTER simulation - Abstract
Robust finite-time control for spacecraft with coupled translation and attitude dynamics is investigated in the paper. An error-based spacecraft motion model in six-degree-of-freedomis firstly developed. Then a finite-time controller based on nonsingular terminal sliding mode control technique is proposed to achieve translation and attitude maneuvers in the presence of model uncertainties and environmental perturbations. A finite-time observer is designed and a modified controller is then proposed to deal with uncertainties and perturbations and alleviate chattering. Numerical simulations are finally provided to illustrate the performance of the proposed controllers. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
29. Robust Coordinated Control Algorithm for Multiple Marine Vessels with External Disturbances.
- Author
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Weixue Liu, Jianfang Jiao, Hamid Reza Karimi, and Jian Jiao
- Subjects
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ROBUST control , *COMPUTER algorithms , *DYNAMICAL systems , *COMPUTER simulation , *TRAJECTORIES (Mechanics) - Abstract
Theproblem of coordinated control formultiplemarine vessels in the presence of external disturbances is considered in this paper.A robust coordinated control algorithmis proposed formultiplemarine vessels. The proposed robust coordinated control algorithmis divided into two parts. The first part develops an extended state observer to estimate the disturbances of marine vessels. The second part presents a robust coordinated control algorithm based on the output of the extended state observer. Furthermore, the robust coordinated control algorithm is designed using the dynamic surface control method. In light of the leader-follower strategy, the trajectory for each vessel is defined according to the desired trajectory of the assigned leader and the relative distance with respect to the leader. The effectiveness of the proposed coordination algorithm is demonstrated by the simulation results. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
30. Robust Adaptive Synchronization of the Energy Resource System with Constraint.
- Author
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Duo Meng
- Subjects
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ROBUST control , *SYNCHRONIZATION , *POWER resources , *SUPPLY & demand , *LYAPUNOV functions , *PARAMETER estimation , *COMPUTER simulation - Abstract
Two different chaos synchronization methods are proposed for a class of energy resource demand supply-system with input constraint. Firstly, chaotic synchronization is achieved for a class of energy resource demand supply system with known system parameters based on the Lyapunov theory. Secondly, an adaptive control approach is investigated for a class of energy resource demand supply system with input constraint, and the parameters of the system are unknown based on the Lyapunov stability and robust adaptive theory. To address the input constraint, new auxiliary signals and design systems are employed. Numerical simulations are provided to illustrate the effectiveness of the proposed approach. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
31. A Strategy of Robust Control for the Dynamics of an Unmanned Surface Vehicle under Marine Waves and Currents
- Author
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Jose A. Ruz-Hernandez, Manuel J. Velueta, Jose L. Rullan, and Hussain Alazki
- Subjects
Computer simulation ,Article Subject ,business.industry ,Computer science ,lcsh:Mathematics ,020209 energy ,General Mathematics ,020208 electrical & electronic engineering ,Work (physics) ,Dynamics (mechanics) ,General Engineering ,Robotics ,02 engineering and technology ,lcsh:QA1-939 ,Sliding mode control ,Computer Science::Robotics ,Data acquisition ,lcsh:TA1-2040 ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Trajectory ,Artificial intelligence ,Robust control ,lcsh:Engineering (General). Civil engineering (General) ,business - Abstract
This work addresses one of the most common problems for mobile robotics (autonomous navigation) but is applied to the dynamical model of a catamaran of small dimensions for monitoring and data acquisition applications. In this work, we present the study of the dynamics of a USV (Unmanned Surface Vehicle) under the presence of two simulated environmental perturbations: marine induced waves and currents. The mathematical model of the vehicle is studied and the equations that describe the behavior of environmental perturbations are also described. A numerical simulation of the model considering the effects of these perturbations is carried out in three degrees of freedom. Also, a strategy of robust control-based Sliding Mode Control (SMC) is developed for counteracting the effects of the perturbations over the trajectory of the USV.
- Published
- 2019
- Full Text
- View/download PDF
32. Observer Based Robust Position Control of a Hydraulic Servo System Using Variable Structure Control
- Author
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Emna Kolsi-Gdoura, Moez Feki, and Nabil Derbel
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Variable structure control ,Engineering ,Article Subject ,Computer simulation ,business.industry ,lcsh:Mathematics ,General Mathematics ,Attenuation ,General Engineering ,Perturbation (astronomy) ,Control engineering ,Servomechanism ,lcsh:QA1-939 ,Sliding mode control ,law.invention ,lcsh:TA1-2040 ,law ,Control theory ,Backstepping ,Robust control ,lcsh:Engineering (General). Civil engineering (General) ,business - Abstract
This paper deals with the position control of a hydraulic servo system rod. Our approach considers the surface design as a case of virtual controller design using the backstepping method. We first prove that a linear surface does not yield to a robust controller with respect to the unmatched uncertainty and perturbation. Next, to remedy this deficiency, a sliding controller based on the second-order sliding mode is proposed which outperforms the first controller in terms of chattering attenuation and robustness with respect to parameter uncertainty only. Next, based on backstepping a nested variable structure design method is proposed which ensures the robustness with respect to both unmatched uncertainty and perturbation. Finally, a robust sliding mode observer is appended to the closed loop control system to achieve output feedback control. The stability and convergence to reference position with zero steady state error are proven when the controller is constructed using the estimated states. To illustrate the efficiency of the proposed methods, numerical simulation results are shown.
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- 2015
33. Adaptive Sliding Mode Control Using Robust Feedback Compensator for MEMS Gyroscope
- Author
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Juntao Fei and Dan Wu
- Subjects
Lyapunov function ,Engineering ,Adaptive control ,Article Subject ,Computer simulation ,business.industry ,General Mathematics ,lcsh:Mathematics ,Vibrating structure gyroscope ,General Engineering ,Control engineering ,lcsh:QA1-939 ,Sliding mode control ,symbols.namesake ,Control theory ,Robustness (computer science) ,lcsh:TA1-2040 ,Control system ,symbols ,Robust control ,business ,lcsh:Engineering (General). Civil engineering (General) - Abstract
An adaptive sliding mode control using robust feedback compensator is presented for a MEMS gyroscope in the presence of external disturbances and parameter uncertainties. An adaptive controller with a robust term is used to improve the robustness of the control system and compensate the system nonlinearities. The proposed robust adaptive control can estimate the angular velocity and all the system parameters including damping and stiffness coefficients in the Lyapunov framework. In addition, standard adaptive control scheme without robust algorithm is compared with the proposed robust adaptive scheme in the aspect of numerical simulation and algorithm derivation. Numerical simulations show that the robust adaptive control has better robustness in the presence of external disturbances than the standard adaptive control.
- Published
- 2013
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