Article
Engineering, Marine
Rui Du, Naige Wang, Hangyu Rao
Summary: This paper investigates the vibration suppression problem of a deep-sea robot in harsh operating environments with time variation. A robust adaptive output feedback control scheme based on backstepping control method is designed, along with a nonlinear disturbance observer (NDO), to eliminate robot vibration. The stability of the system is proven using Lyapunov's theory and the proposed controller is validated through a comparative simulation study.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Automation & Control Systems
Wanli Wang, Yan Lin, Qingrui Meng
Summary: This article considers adaptive output feedback tracking for a class of nonlinear systems with uncertain parameters, sensor uncertainties, and external disturbances. A state observer and an adaptive controller are constructed based on gain scaling technique to compensate for the effects of sensor uncertainties. The proposed scheme ensures that all states of the closed-loop system are bounded and the tracking error converges to an arbitrarily small residual set.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Guichao Yang, Hua Wang, Jie Chen
Summary: This study proposes a nonlinear robust controller with disturbance compensation and asymptotic disturbance observers to achieve high-performance tracking control for systems with matched and mismatched modeling uncertainties, demonstrating effective output tracking performance.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2021)
Article
Engineering, Aerospace
Seyed Hamed Hashemi, Naser Pariz, Seyed Kamal Hosseini Sani
Summary: An observer-based adaptive hybrid attitude controller is presented to overcome topological obstructions associated with global attitude stabilization. The controller consists of an adaptive trimodal hybrid controller and a centrally synergistic potential function, utilizing adaptive techniques and auxiliary dynamical systems to achieve robust global asymptotic stability. The controller demonstrates effectiveness and superiority in simulations, showcasing its potential for practical applications.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Automation & Control Systems
Xinyi Lu, Fang Wang, Zhi Liu, L. Philip Chen
Summary: The objective of this article is to propose an adaptive neural inverse optimal consensus tracking control for nonlinear multi-agent systems (MASs) with unmeasurable states. A new observer is created to approximate the unknown state, which includes the outputs of other agents and their estimated information. The proposed scheme not only insures that all signals of the system are cooperatively semiglobally uniformly ultimately bounded (CSUUB), but also realizes optimal control of all signals.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Automation & Control Systems
Yan Zhao, Jiangbo Yu
Summary: This paper investigates the adaptive asymptotically stabilizing control problem for uncertain nonlinear systems using partial-state feedback, with a focus on input-to-state stability and the novel Nussbaum function to counteract unknown control directions. Damping terms with estimates of unknown disturbance bounds are added in control design to handle nonvanishing external disturbances, resulting in bounded signals and asymptotic convergence of system states to zero despite uncertainties. A simulation example is provided to demonstrate the effectiveness of the proposed control scheme.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2021)
Article
Automation & Control Systems
Dongdong Xia, Xiaokui Yue, Yuwan Yin
Summary: In this paper, a novel neural adaptive output-feedback control method is investigated for rigid-body attitude with inertia uncertainty, unavailability of the angular velocity, and unknown external disturbance. By combining the first-order filter and coordinate transformation, the original output feedback system is converted into a full-state strict feedback system with mismatched disturbance. An innovative neural network-based adaptive control scheme is proposed using backstepping technique and the infinitely integrable inequality with saturation function. The developed algorithm achieves asymptotic tracking performance for the transformed system and the attitude tracking system without angular velocity simultaneously. Comparative numerical simulations validate the efficacy of the algorithm.
Article
Engineering, Multidisciplinary
Zhikai Yao, Xianglong Liang, Qianting Zhao, Jianyong Yao
Summary: This study proposes an adaptive disturbance observer-based asymptotic tracking control strategy for high accuracy tracking control of hydraulic systems. The strategy compensates for time-varying disturbance using model-based feed-forward control terms designed by an error-function-based disturbance observer. Online adaptive control is integrated to address parameter uncertainty. The proposed controller achieves global asymptotic stability under mismatched or match disturbance and demonstrates state-of-the-art tracking performance in the presence of parameter uncertainty and time-varying disturbance.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Aerospace
Dongdong Xia, Xiaokui Yue
Summary: This study proposes a modular anti-unwinding dynamic scaling-based adaptive control method for rigid spacecraft attitude. By reconstructing the matrix and introducing a modified scaling factor, the method achieves a simpler controller structure and lower dimensional dynamic extension.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Automation & Control Systems
Xi Luo, Changchun Hua, Jiajun Li, Qidong Li
Summary: This article addresses the adaptive prescribed performance tracking control problem for a class of strict-feedback nonlinear systems with parametric uncertainties and actuator failures. A new adaptive tracking controller based on first-order filter technology is proposed to compensate for the uncertainties and eliminate the influence of actuator failure. The transient and steady performances of the output tracking error are constrained using an asymmetric state transition function to achieve the predetermined performance control goal.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Mathematics
Manh Hung Nguyen, Kyoung Kwan Ahn
Summary: This paper proposes a novel simple and effective output feedback robust control (OFRC) approach for achieving highly accurate position tracking of a pump-controlled electro-hydraulic system. The unavailability of all system state information is addressed by employing an extended state observer (ESO) to estimate the angular velocity and load-pressure-related state variable of the actuator and total matched disturbance. Additionally, a disturbance observer (DOB) ESO is integrated to compensate for adverse effects of lumped mismatched uncertainty caused by parameter perturbation and external loads in the velocity dynamics.
Article
Automation & Control Systems
Zhenbin Du, Yonggui Kao, Ju H. Park
Summary: This paper addresses the interval type-2 fuzzy tracking control problem for nonlinear networked control systems with unreliable communication links. A tracking controller is designed for interval type-2 fuzzy sampled-data system under unreliable communication, enhancing stability through membership function characteristics and utilizing Lyapunov theory. The paper provides less conservative sufficient condition for designing networked tracking controller to ensure anticipated tracking performance, demonstrated through simulation examples.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2021)
Article
Energy & Fuels
Tianhao Wen, Yang Liu, Q. H. Wu, Luonan Qiu
Summary: A cascaded sliding-mode observer based output feedback controller for MIMO system is proposed in this paper, designed based on feedback linearization control strategy. The observer provides accurate estimates of states and perturbations, ensuring Lyapunov stability of the closed-loop system and output tracking control. Simulation studies on SWNCSIB system validate the performance of the proposed observer-based output feedback controller.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2021)
Article
Automation & Control Systems
Zhirong Zhang, Changyun Wen, Lantao Xing, Yongduan Song
Summary: This article presents a solution to the problem of synthesizing control with input and output quantizations for nonlinear systems subject to mismatched parametric uncertainties. The solution involves employing a dynamic filtering technique, using the parameter projection technique, and proposing a new form of state observer. The proposed solution ensures bounded closed-loop signals and adjustable control performance.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Automation & Control Systems
Gewei Zuo, Yujuan Wang
Summary: This article proposes an asymptotic tracking control solution for a class of strict-feedback systems subject to asymmetric time-varying full-state constraints and non-vanishing uncertainties. The method aims to completely reject the non-vanishing uncertainties and remove the feasibility conditions.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2022)
Article
Chemistry, Multidisciplinary
Shengru Chen, Qinghua Zhang, Dongke Rong, Yue Xu, Jinfeng Zhang, Fangfang Pei, He Bai, Yan-Xing Shang, Shan Lin, Qiao Jin, Haitao Hong, Can Wang, Wensheng Yan, Haizhong Guo, Tao Zhu, Lin Gu, Yu Gong, Qian Li, Lingfei Wang, Gang-Qin Liu, Kui-juan Jin, Er-Jia Guo
Summary: This study reports the creation of morphotropic grain boundaries in laterally interconnected cobaltite homostructures. By modulating and isolating electronic states and magnetic behavior through the grain boundaries, artificially engineered functionalities can be achieved in the planar matrix.
ADVANCED MATERIALS
(2023)
Letter
Surgery
Qiyuan Huang, Xiaojuan Jiang, Guo Chen, Tao Zhu
ASIAN JOURNAL OF SURGERY
(2023)
Article
Nanoscience & Nanotechnology
Huiying Xiang, Yuan Yuan, Cheng Zhang, Xu Dai, Tao Zhu, Linbo Song, Yu Gai, Ruijin Liao
Summary: By studying the effects of surfaces with different pore sizes and porosities on the performance of SLIPSs, it was found that small pores and high porosity are beneficial for the preparation of durable anti-icing SLIPSs, which can greatly improve the lubricant stability and achieve rapid self-healing.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Automation & Control Systems
Ming Cai, Tao Zhu, Yadong Gong, Xingjun Gao, Qiang Gong, Ning Yu
Summary: This study investigates the impact of rhenium element and grain boundaries on the dislocation slip during the grinding process of Ni-based superalloys. The experiments reveal that the rhenium element significantly enhances the high-temperature durability of the alloys. Under low-temperature conditions, DD5 exhibits better machining quality compared to DD98, while under high-temperature conditions, DD5 has lower machining quality. Moreover, the surface quality of GH4169 is better than DD5 due to grain boundaries, and their chip morphologies differ significantly.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Automation & Control Systems
Guichao Yang
Summary: This paper constructs two new continuous integral robust control algorithms for high-order uncertain nonlinear systems with asymptotic tracking performance. By introducing filtered error variables, asymptotic filters, and an auxiliary system, the algorithms are integrated using an improved backstepping framework. The virtual control law integrated at each step passes through a novel asymptotic filter, and the stability of the closed-loop system under each controller is strictly proved.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2023)
Article
Nanoscience & Nanotechnology
Jianbin Zhang, Conghui Shang, Xinyue Dai, Yao Zhang, Tao Zhu, Nan Zhou, Hua Xu, Rusen Yang, Xiaobo Li
Summary: Germanium arsenic (GeAs), a promising two-dimensional material, has high carrier mobility and tunable bandgap, making it suitable for electronic and optoelectronic devices. However, the rapid degradation of GeAs in the environment hampers its practical application. This study presents a method to stabilize GeAs using a graphene capping layer, which effectively suppresses environmental degradation and improves device performance. The encapsulated GeAs photodetectors maintained key electronic properties for over 3 months under ambient conditions, with an improved responsivity 20 times higher than pure GeAs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Endocrinology & Metabolism
Tao Zhu, Xu Chen, Shenglu Jiang
Summary: Transplantation of brown adipose tissue (BAT), engineered thermogenic progenitor cells, and adipocytes have been studied for their potential in improving obesity and metabolic disorders. However, the whitening of the brown fat graft and impaired metabolic function are significant challenges. This review discusses specific experiment designs, graft outcomes, and metabolic benefits, providing guidance for further investigation and innovation in BAT transplantation methods.
FRONTIERS IN ENDOCRINOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Huiying Xiang, Yuan Yuan, Tao Zhu, Xu Dai, Cheng Zhang, Yu Gai, Ruijin Liao
Summary: In recent years, the depletion of lubricant in slippery lubricant-infused porous surface (SLIPS) has been a concern, limiting its application in anti-icing. This study focuses on the lubricant storage, depletion, and self-healing rate after depletion to improve the anti-icing durability of SLIPS. By fabricating a dendritic porous structure and optimizing the pore depth ratio and surface porosity, the dendritic slippery surface (Y-SLIPS) shows better anti-icing durability compared to traditional slippery surface (I-SLIPS). The Y-SLIPS can withstand more frosting/defrosting cycles and icing/deicing cycles while maintaining extremely low ice-adhesion strength.
MATERIALS TODAY PHYSICS
(2023)
Article
Mechanics
Dongdong Chen, Xiaoyu Sun, Shoune Xiao, Guangwu Yang, Bing Yang, Tao Zhu, Mingmeng Wang
Summary: This study investigated the energy-absorbing mechanisms of composite structures subjected to quasistatic and dynamic axial crushing loads. Double hat-shaped composite tubes made of CFRP and GFRP were tested and analyzed. Results showed that the CFRP structures had reduced energy absorption at higher loading rates, while the GFRP structures remained relatively constant. A finite element model considering strain rate effects accurately predicted the crushing behavior. Mechanical properties of the composite materials played a critical role in the distinct responses of CFRP and GFRP structures. The findings contribute to the crashworthiness design of composite energy-absorbing structures.
COMPOSITE STRUCTURES
(2023)
Article
Biochemistry & Molecular Biology
Shanzhu Guo, Yue Jiang, Jingjing Jiao, Yan Shi, Tao Zhu, Long Li
Summary: In this study, a gelatin-based biomimetic three-layer vascular scaffold with spatial alignment features mimicking the natural structure of blood vessels was successfully constructed using a sequential electrospinning strategy combined with folding and rolling manipulation. The scaffold could fully mimic the natural multi-layer structures of blood vessels and showed great potential for guiding the spatial arrangement of cells in blood vessels.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Mechanical
Long Yang, Bing Yang, Guangwu Yang, Lanxin Jiang, Shoune Xiao, Tao Zhu
Summary: Fa-N curves and σn_s-N curves of bolted connections under different geometric and load parameters were obtained through tensile-shear fatigue tests. The correlation of these curves was poor and did not meet engineering requirements. To address this issue, an equivalent structural stress calculation model considering the bolt load as the input condition was derived. A plate-shell finite element model for bolted connections was established to extract load parameters for bolts and obtain the equivalent structural stress at the crack initiation position. Finally, a fatigue evaluation method based on equivalent structural stress and considering geometric and load parameters was developed for bolted connections.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Optics
Laiyang Dang, Bowen Zheng, Yulong Cao, Chaoze Zhang, Ligang Huang, Paul Ikechukwu Iroegbu, Leilei Shi, Tianyi Lan, Jiali Li, Guolu Yin, Tao Zhu
Summary: We have proposed and demonstrated a fiber laser scheme with wide tunability and ultra-narrow linewidth by utilizing an original Fabry-Perot laser main cavity and a distributed external feedback structure. This was achieved by injecting a distributed feedback signal into the main cavity to induce intense mode competition. The obtained single frequency fiber laser exhibits excellent performance with a side mode suppression ratio of 69 dB, an output linewidth of 570 Hz, a white frequency noise of 110 Hz(2)/Hz at a high frequency offset, and a relative intensity noise less than -140 dB/Hz. The laser also maintains high spectral purity under different pump powers for each wavelength channel. This work presents a promising method for obtaining tunable ultra-narrow linewidth lasers.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Qiang Wang, Fengdan Zhu, Yanjuan Cai, Tao Zhu, Xiaolan Lu
Summary: A nomogram model was established to predict the risk of active tuberculosis (ATB) and differentiate it from inactive tuberculosis (IATB) using the concentration of interferon-γ (IFN-γ) and clinical characteristics. The model was trained and validated in different cohorts and combined with adenosine deaminase (ADA) to improve the performance in ATB cases with pleural effusion (PE). The diagnostic nomogram model showed good sensitivity and specificity in both the training and validation cohorts, and the combination with ADA further improved the performance.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Hongxia Li, Yuxin Lu, Tao Zhu, Rongxin Cao, Yuxiong Xue, Xianghua Zeng
Summary: The impact of gamma-irradiation on the properties of unpacked InGaN/GaN LEDs was investigated. Photoluminescence spectra revealed three peaks corresponding to different materials, and their peak positions remained unaffected by gamma irradiation doses up to 100 kGy. However, the intensities of the peaks were changed with gamma irradiation. The LED properties, including operating voltage, luminous flux, and photoelectric conversion efficiency, were all influenced by the total gamma-ray doses.
MICROELECTRONICS RELIABILITY
(2023)
Article
Engineering, Mechanical
Tao Zhu, Haoxu Ding, Chao Wang, Yuxin Liu, Shoune Xiao, Guangwu Yang, Bing Yang
Summary: The paper focuses on the quasi-static fracture experiments of SUS301L-MT under different stress states in order to improve the accuracy of the corresponding finite element simulation and guide the design of vehicle crashworthiness. The fracture behavior, locations, and strains of the material were obtained through tests, and the parameters of the GISSMO failure model were calibrated and verified. Results show good agreement between simulation and experimental data for the force-displacement curve, but further study and improvement are needed for the strain distribution.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2023)