Article
Mathematics
Xiufeng Miao, Yaoqun Xu, Fengge Yao
Summary: This paper addresses the problem of ultimately exponentially bounded estimate for nonlinear stochastic discrete-time systems under generalized Lipschitz conditions. A new sufficient condition is proposed to ensure the uniform exponential boundedness of the estimation error system in the mean square sense. The gain matrix can be obtained by solving a matrix inequality. Numerical examples are provided in the last section to validate the effectiveness of the proposed conclusions.
Article
Mathematics, Applied
Zhongyang Ming, Huaguang Zhang, Yuling Liang, Hanguang Su
Summary: In this paper, a single network adaptive dynamic programming (ADP) control method is proposed for the non-zero sum (NZS) differential game problem of the autonomous nonlinear system. The Osgood condition is introduced to ensure the existence and uniqueness of the solution of the dynamic nonlinear systems and to weaken the limited conditions of nonlinear dynamic functions. The proposed method achieves real-time approximations of the optimal value and the non-zero sum Nash-equilibrium, while ensuring the uniform ultimate epsilon-boundedness of the closed-loop system. The effectiveness of the method is verified through a simulation example.
APPLIED MATHEMATICS AND COMPUTATION
(2022)
Article
Acoustics
Meysam Azhdari, Tahereh Binazadeh
Summary: This article investigates the output tracking problem of uncertain nonlinear sandwich systems with sandwiched dead-zone nonlinearity, proposing a phased design method to address the design complexities. Simulation results demonstrate the acceptable accuracy and effectiveness of the proposed method.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Automation & Control Systems
Lei Zou, Zidong Wang, Jun Hu, Hongli Dong
Summary: This article presents a novel filtering scheme for linear time-delay systems to protect the filtering performance from impulsive measurement outliers using parameter-dependent filtering approach and outlier detection scheme, which effectively handles random impulse measurement anomaly cases.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Mathematics, Applied
Jianguo Zhang, Dapeng Zhou
Summary: This paper introduces the concept of uniformly bounded fibred coarse embeddability of metric spaces, shows its relationship with uniformly bounded a-T-menability of groups, and illustrates the differences between uniformly bounded fibred coarse embeddability and fibred coarse embeddability with examples.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2022)
Article
Automation & Control Systems
Adithya M. Devraj, Sean P. Meyn
Summary: This study aims to introduce a new class of algorithms with sample complexity uniformly bounded over all discount factors; meanwhile, it points out that prior bounds concern value function approximation rather than policy approximation.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Automation & Control Systems
Lisai Gao, Fuqiang Li, Jingqi Fu
Summary: This paper studies the output-based L-infinity security control of a nonlinear system under the event-triggered mechanism (ETM) and random deception attacks. A general ETM is proposed to achieve a low triggering rate throughout the system-running time. By integrating the ETM, Bernoulli-distribution deception attacks, and network-induced delays, a closed-loop T-S fuzzy system model is built. Ultimately bounded stability criteria with guaranteed L-infinity performance are obtained, and sufficient conditions for designing dynamic output feedback fuzzy controller are derived. An example is provided to illustrate the effectiveness of the proposed methods.
INTERNATIONAL JOURNAL OF FUZZY SYSTEMS
(2022)
Article
Construction & Building Technology
Zhi Li, Xin Ma, Yibin Li
Summary: This paper proposes a stabilizing control method for a double pendulum offshore crane, which can suppress swings in the presence of disturbances and actuator saturations, and demonstrates strong robustness to various disturbances.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Engineering, Mechanical
Chao Fu, Zhaoli Zheng, Weidong Zhu, Kuan Lu, Yongfeng Yang
Summary: This paper investigates the propagation of uncertainties in nonlinear vibrations of a rotor system with local nonlinearities and proposes a non-intrusive surrogate modeling method. Through comprehensive case studies and numerical validations, it is shown that the proposed method can effectively predict the vibrational behavior of nonlinear rotor systems with bounded uncertainties.
NONLINEAR DYNAMICS
(2022)
Article
Computer Science, Information Systems
Shenghai Wang, Zhaopeng Ren, Guoliang Jin, Haiquan Chen
Summary: This paper presents a novel Cable-Driven Inverted Tetrahedron Mechanism (CDITM) for offshore crane safety, investigating the influence of ship excitations and other factors on payload swing and verifying the dynamic modeling and analysis through theoretical and experimental results, providing fundamental and valuable insights for the engineering application of CDITM in offshore industries.
Article
Engineering, Marine
Falguni Gopmandal, Arun Ghosh, Avinash Kumar
Summary: This article presents the design of a controller for dynamic positioning of ships, considering the uncertainties in hydrodynamics. The controller uses a two-degree-of-freedom proportional-integral-derivative (PID) control approach and represents the ship dynamics using an uncertain state-space descriptor form. The design includes feedback gains and a linear matrix inequality-based condition to ensure desired performance even in the presence of uncertainties. A feedforward gain is also designed to improve tracking performance, and the proposed controller is compared with existing PID controllers to demonstrate its superiority.
Article
Automation & Control Systems
Peihu Duan, Qishao Wang, Zhisheng Duan, Guanrong Chen
Summary: This article investigates state estimation for a class of complex networks and proposes a distributed optimization method and a class of estimators to handle system dynamics and constraints. The proposed method unifies modeling of uncertainties and nonlinearities and ensures the feasibility of estimators and boundedness of errors under a developed criterion.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Automation & Control Systems
Jiangbo Yu, Alexandru Stancu, Zhengtao Ding, Yuqiang Wu
Summary: This article investigates the adaptive finite/fixed-time stabilizing control problem for a class of uncertain nonlinear systems. The proposed state feedback stabilization process consists of two phases, and a recursive design method is used to develop the adaptive finite/fixed-time stabilizing control scheme. The effectiveness of the presented algorithm is demonstrated through the angular set-point stabilizing control of a pendulum system.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2023)
Article
Automation & Control Systems
Peter Seiler, Raghu Venkataraman
Summary: This article investigates the robustness of an uncertain nonlinear system by approximating the system with a linear time-varying system and describing the perturbation with integral quadratic constraints. The analysis provides a computational method for bounding the worst-case performance without using heuristics like time gridding.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2023)
Article
Engineering, Mechanical
Kaio C. B. Benedetti, Paulo B. B. Goncalves, Stefano Lenci, Giuseppe Rega
Summary: An adaptative phase-space discretization strategy is proposed for the global analysis of stochastic nonlinear dynamical systems with competing attractors considering parameter uncertainty and noise. The strategy is based on the classical Ulam method and derived transfer operators are used to obtain and refine attractor distributions and basins of attraction boundaries. The concept of stochastic basin of attraction is introduced, quantifying the probability of convergence to a specific attractor. The method is applied to a nonlinear oscillator with noise and uncertainty, showing significant computational cost reduction.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Minh-Thien Tran, Dong-Hun Lee, Soumayya Chakir, Young-Bok Kim
Summary: The study introduces a novel adaptive super-twisting sliding mode control scheme (ASTSMC-TDE) for controlling the yaw angle of a single ducted-fan unmanned aerial vehicle system. Simulation and experimental tests are conducted to investigate the impact of the ASTSMC-TDE control scheme on the system's performance.
Article
Engineering, Marine
Hwan-Cheol Park, Soumayya Chakir, Young-Bok Kim, Thinh Huynh
Summary: This paper presents a novel nonlinear control approach for achieving accurate real-time tracking performance in maritime surveillance applications for a two-axis gimbal. The proposed nonlinear backstepping controller is designed to enhance tracking performance and system stability, with an additional backstep to minimize control errors due to delay time. Simulation and experimental studies validate the improvements in tracking performance and system bandwidth compared to a previous super-twisting sliding mode controller.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Thinh Huynh, Minh-Thien Tran, Dong-Hun Lee, Soumayya Chakir, Young-Bok Kim
Summary: This paper proposes a new method for controlling the pose of a camera mounted on a two-axis gimbal system for visual servoing applications, achieving better control performances by decoupling the couplings in both mechanism's kinematics and imaging geometry simultaneously. Simulation and experimental studies validate the efficiency of the proposed control system, which requires fewer measurements and results in smoother transient responses compared to other common control methods.
Article
Chemistry, Multidisciplinary
Dong-Hun Lee, Young-Bok Kim, Soumayya Chakir, Thinh Huynh, Hwan-Cheol Park
Summary: This paper introduces a novel control strategy for six degrees-of-freedom active vibration isolation tables, using a noninteracting controller to achieve complete decoupling of the system for improved control performance.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Cao-Tri Dinh, Thinh Huynh, Young-Bok Kim
Summary: This study proposes a flying robot using waterpower and a weight-shifting mechanism for firefighting tasks in water areas. The system's dynamical characteristics are analyzed through mathematical models, and a LQI controller is designed and tuned with a genetic algorithm for optimal performance and robustness. Simulation results demonstrate the superiority of the proposed system over traditional PID control in terms of motion performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Marine
Dong-Hun Lee, Thinh Huynh, Young-Bok Kim, Jung-Suk Park
Summary: In this study, a mathematical model was developed and robust control systems were designed to ensure efficient operation of barge ships. The superiority of the proposed sliding mode controller, especially in terms of robustness against disturbances, was verified.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Thinh Huynh, Minh-Thien Tran, Munhaeng Lee, Young-Bok Kim, Jungwoo Lee, Jin-Ho Suh
Summary: This study proposes a novel autonomous system for safely and quickly retrieving an underwater glider. The system utilizes a remotely operated vehicle (ROV) to drive near the glider, automatically catch it using sensors and capturing mechanisms, and retrieve it to the mother ship or station. Mathematical models and a control system are used to address various disturbances. Simulation results validate the efficiency of the proposed process.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Thinh Huynh, Dong-Hun Lee, Young-Bok Kim
Summary: In this study, we proposed and analyzed three designs of a novel aerial system for autonomous firefighting missions in water areas. The proposed systems utilize water sources for suppressing fires and maneuvering. The designs differ in their actuating methods: flow rate control, nozzle rotation control, and weight distribution control. Mathematical models were formulated to reveal the motion characteristics of each system. Simulation studies were conducted and results indicate that the nozzle rotation control system is the better one.
APPLIED SCIENCES-BASEL
(2023)
Article
Remote Sensing
Thinh Huynh, Young-Bok Kim
Summary: In this study, an effective controller is designed for a new water-powered aerial system aiming for autonomous firefighting missions, particularly in bodies of water. Unlike existing systems, the proposed system uses flow-regulating actuators to fully operate in three-dimensional space. The paper formulates the system dynamics and designs a nonlinear controller considering the system's characteristics, achieving stability and uniform boundedness. Computational studies validate the superiority and feasibility of the proposed control system compared to previous methods.
Article
Computer Science, Information Systems
Cao-Tri Dinh, Thinh Huynh, Dong-Hun Lee, Young-Bok Kim
Summary: A novel unmanned water-powered aerial vehicle with an angular motion controller is proposed in this study, leveraging a rotation mechanism to adjust water thrust direction instead of relying on riders' skills. Experimental results demonstrate the feasibility of the design and the superiority of the proposed controller.
Article
Computer Science, Information Systems
Thinh Huynh, Young-Bok Kim
Summary: This study proposes a robust fault-tolerant control scheme for a low-cost tracking system, which estimates faults and disturbances to design a robust controller. Experimental results demonstrate the excellent performance and reliability of the proposed control system.
