Article
Engineering, Aerospace
Zhilong Yu, Yinghui Li, Maolong Lv, Jing Chang, Binbin Pei
Summary: This paper proposes a predefined-time fault-tolerant attitude control methodology for tailless aircraft. It compensates for the adverse influence caused by actuator fault and input saturation simultaneously using a novel predefined-time performance function and bound-based adaptation laws. The stability analysis of the closed-loop system is conducted using a piecewise continuous Lyapunov function, and it is proven that the attitude tracking errors can converge to a predefined residual set within a predefined time. Comparative simulations validate the effectiveness and superiority of the developed control scheme.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Automation & Control Systems
Meysam Yadegar, Nader Meskin
Summary: This paper proposes an adaptive fault tolerant-control scheme based on the virtual actuator framework for addressing time-varying loss of effectiveness and time-varying additive actuator faults in nonlinear heterogeneous multi-agent systems. The proposed scheme eliminates the need for separate fault detection modules and is independent of the mission of the multi-agent systems. Simulation results with a network of manipulators demonstrate the effectiveness of the proposed fault tolerant-control methodology.
Article
Chemistry, Multidisciplinary
Kai-Yu Hu, Wenjing Sun, Chunxia Yang
Summary: This study investigates the adaptive fault-tolerant control (FTC) for a flexible variable structure spacecraft in the presence of external disturbance, multiple actuator faults, and saturation. The proposed methods include fault detection and estimation observers, as well as adaptive FTC schemes. Simulation results demonstrate the effectiveness of the proposed methods.
APPLIED SCIENCES-BASEL
(2022)
Article
Automation & Control Systems
Yang Yang, Yuwei Zhang, Zijin Wang, Jinran Wu, Xuefeng Si
Summary: In this paper, a fault-tolerant control scheme based on event-triggering is proposed for a non-affine system with uncertainties in the presence of unknown actuator failures. The scheme utilizes predefined performance and compensation mechanism to achieve higher tracking accuracy and alleviate the impact of actuator failures. An adaptive event-triggered function is introduced to reduce the number of communications and improve the self-adjusting ability. Extended state observers and tracking differentiators are used to reconstruct unknown dynamics and simplify virtual control laws. The stability of the closed-loop system is analyzed using input-to-state practically stability. Two simulation results are provided to verify the effectiveness of the proposed control method.
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
(2023)
Article
Computer Science, Artificial Intelligence
Shoulin Xu, Bin He
Summary: This article proposes a robust adaptive fuzzy fault tolerant control framework to address the safety tracking problem of robot manipulators. The approach ensures the stability of the control system through constraint mechanism and adaptive fuzzy logic system, and the boundedness of the closed-loop dynamics is proven by a Lyapunov function. Simulation and experimental results demonstrate the effectiveness and good control performance of the proposed approach.
IEEE TRANSACTIONS ON FUZZY SYSTEMS
(2023)
Article
Engineering, Marine
Haitao Liu, Xiuying Huang, Qingqun Mai, Xuehong Tian
Summary: A fixed-time fault-tolerant control strategy is proposed in this paper for trajectory tracking of underactuated surface vessels (USVs) with input saturation. A predefined region boundary function is introduced to provide predefined specifications and convergence properties for tracking errors. The proposed control system utilizes a fixed-time adaptive neural network and Lyapunov stability theory to approximate and control unknown disturbances and nonlinear terms, resulting in improved tracking performance.
Article
Engineering, Marine
Gaofeng Che
Summary: This work investigates the fault-tolerant control problem for underactuated autonomous underwater vehicle (AUV) and proposes a novel fault-tolerant control scheme combined with the backstepping method using a single critic network based adaptive dynamic programming (ADP). The effectiveness of the proposed method is verified through simulation results.
Article
Automation & Control Systems
Jun-Wei Zhu, Qiao-Qian Zhou, Jian-Ming Xu, Jian-Wei Dong
Summary: This paper proposes an observer-based fault-tolerant control method for a linear system with sensor saturation constraint. By modifying the intermediate estimator and designing a fault-tolerant controller, the system states and fault signals can be estimated simultaneously to compensate for the effects of actuator faults, ensuring the closed-loop system states to be uniformly ultimately bounded. Furthermore, the sensor saturation error can be suppressed by adjusting specific parameters directly without introducing any performance index, demonstrating the effectiveness and superiority of the proposed method through simulation examples.
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
(2021)
Article
Automation & Control Systems
Shaojie Zhang, Chenyu Huang, Kun Ji, Han Zhang
Summary: In this paper, a model-free incremental adaptive optimal fault-tolerant controller is proposed for nonlinear systems subject to actuator faults. The controller considers actuator redundancy and includes an actuator grouping scheme, an incremental adaptive fault observer, and the use of recursive least squares identification. Dynamic process requirements and optimal performance index are taken into consideration using prescribed performance bound and incremental adaptive dynamic programming. Simulations are provided to verify the effectiveness of the proposed control scheme.
Article
Engineering, Mechanical
Chen-Liang Zhang, Ge Guo
Summary: This paper investigates the prescribed performance control problem of autonomous surface vessels with actuator faults. A barrier Lyapunov function and error-shifting transformation are utilized to establish a PPC framework, ensuring performance satisfaction and control simplicity. An adaptive fault-tolerant controller is derived using event-triggered inputs, which saves communication resources and reduces online computation burden. Through stability analysis, it is proven that the closed-loop system is semi-globally uniformly ultimately bounded and achieves convergence in finite time. Simulation examples verify the effectiveness and superiority of the proposed scheme.
NONLINEAR DYNAMICS
(2023)
Article
Automation & Control Systems
Chenfeng Huang, Xianku Zhang, Guoqing Zhang
Summary: This paper proposes an adaptive distributed parallel formation control approach for underactuated marine surface vehicles. The approach employs algebraic topology to model the intervehicle communication network and discusses model uncertainties and environmental disturbance. It also introduces a concise adaptive law and a new adaptive parameter to improve algorithm efficiency and system robustness.
ASIAN JOURNAL OF CONTROL
(2023)
Article
Automation & Control Systems
Kangkang Zhang, Bin Jiang, Xinggang Yan, Zehui Mao, Marios M. Polycarpou
Summary: This article proposes a fault-tolerant control scheme for a class of nonlinear systems, which cancels unmatched actuator faults and disturbances by constructing unified smooth control laws and update laws. Through backstepping design procedure, a set of smooth FTC sliding surfaces and control laws are designed to achieve zero tracking errors and reconstruct time-varying faults and disturbances in the closed-loop FTC system.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2021)
Article
Engineering, Mechanical
Ye Li, Jiayu He, Qiang Zhang, Wenjun Zhang, Yanying Li
Summary: This paper proposes the design of two predefined-time active fault-tolerant controllers for trajectory tracking of autonomous underwater vehicles (AUVs) without causing actuator saturation. The first controller improves trajectory tracking precision, while the second ensures a non-singular property. A predefined-time sliding mode controller is formulated based on a predefined-time disturbance observer and a novel predefined-time auxiliary system, and a non-singular backstepping controller is introduced to guarantee uniformly ultimately bounded (UUB) trajectory tracking error within the predefined time. Theoretical analysis and simulation results demonstrate the advantages of the proposed method.
Article
Automation & Control Systems
Meysam Yadegar, Nader Meskin
Summary: This article introduces a fault-tolerant control scheme for multiagent systems that aims to maintain system performance after actuator faults without the need for additional fault detection units. Simulation results demonstrate the effectiveness of the proposed scheme.
INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING
(2021)
Article
Automation & Control Systems
Yongyi Lin, Jialu Du, Jian Li
Summary: This paper presents a novel robust adaptive finite-time fault-tolerant control scheme for dynamic positioning of vessels, addressing thruster faults, unknown model parameters, and environmental disturbances. By incorporating finite-time control technique, neural networks technique, and sliding mode differentiator, the proposed FTC strategy ensures the vessel reaches the desired position and heading in finite time while maintaining the boundedness of all signals in the closed-loop system. Simulation results demonstrate the effectiveness of the proposed FTC scheme.
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
(2021)
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.