Article
Multidisciplinary Sciences
Galal M. Moatimid, T. S. Amer
Summary: This paper investigates the stability analysis of a rocking rigid rod using a time-delayed square position and velocity. The time delay provides additional safety for the nonlinear vibrating system under consideration. The study is relevant due to the recent focus on time-delayed technologies and the coupling of time delay with the modified Homotopy perturbation method (HPM) in this research.
SCIENTIFIC REPORTS
(2023)
Article
Mathematics, Applied
Kais Ammari, Boumediene Chentouf, Nejib Smaoui
Summary: This paper investigates the stability analysis of a nonlinear time-delayed dispersive equation of order four, proving the well-posedness of the system and exponential convergence of the zero solution. A comprehensive numerical study is conducted, providing numerical illustrations of the stability result.
JOURNAL OF APPLIED MATHEMATICS AND COMPUTING
(2021)
Article
Mathematics, Applied
Yanxia Zhang, Yanfei Jin, Yang Li
Summary: This study investigates the effects of time-delayed feedback control on a vibration energy harvester mounted on a rotating automobile tire, showing that time delay can either enhance or weaken stochastic resonance behavior.
PHYSICA D-NONLINEAR PHENOMENA
(2021)
Article
Computer Science, Artificial Intelligence
He Zhang, Shengyuan Xu
Summary: This article addresses the issue of finite-time almost sure stability in systems with Markov jump parameters and delayed inputs. By utilizing Lyapunov-Krasovskii functional method, finite-time bounded criteria and stability criteria are derived, along with a linear matrix inequality for designing controller gain. The results are applied to finite-time sampled-data control and control of a Markov jump mass-spring model with delayed inputs.
IEEE TRANSACTIONS ON FUZZY SYSTEMS
(2022)
Article
Energy & Fuels
Wang Jiansheng, Su Lide, Zhu Qiang, Niu Jintao
Summary: This work proposes a combination of underground heat extraction and ground power generation systems, and investigates their performance numerically. It is found that the mass flow rate of the geothermal fluid has a significant influence on the system performance, and the optimal extraction scheme is obtained.
Article
Mathematics, Interdisciplinary Applications
Wei -Long Duan, Ling Lin
Summary: This study discusses the stability of tumor-immune responses to chemotherapy system with Gaussian colored noises and time delay using the maximum Lyapunov exponent. The analytical formula of the maximum Lyapunov exponent is derived as a function of intensities and correlation times of Gaussian colored noises as well as delay, indicating how these parameters can impact the stability of the system. The study highlights the noise and delay enhanced stability in the system, which is detected through the maximum Lyapunov exponent.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Biochemical Research Methods
Luyan Yu, Thibaud O. Taillefumier
Summary: Characterizing metastable neural dynamics in finite-size spiking networks remains a challenging task. This study introduces the replica-mean-field (RMF) limit to address this challenge and shows that metastable dynamics in finite-size networks can be fully characterized by stationary firing rates. The study also discusses the emergence of metastability as a stochastic bifurcation in the RMF limits and proposes leveraging the static picture of RMF limits to infer dynamical features of metastable finite-size networks.
PLOS COMPUTATIONAL BIOLOGY
(2022)
Article
Engineering, Chemical
Clement Roy, James F. Klausner, Andre Benard
Summary: The study focuses on understanding the parameters influencing the incipience of blockage phenomenon and designing more efficient packing geometries. A numerical approach using the Volume-of-Fluid (VOF) method is employed to observe the free surface in various flow conditions for different geometries. The results show that the corrugation geometry and material play a key role in the blockage incipience, and critical design features for satisfactory specific coverage and flow periodicity are highlighted.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Marine
Jiacheng Ye, Jing Zhang, Yuebing Wang, Peng Zhao
Summary: This paper presents simulation results of the acoustic field and hydrodynamic noise spectrum of an underwater supercavitation vehicle under various operating conditions. The simulation reveals that low vehicle speed reduces the threshold of ventilated supercavitation, while high background pressure enhances the stability of the supercavitation structure. The noise spectrum exhibits characteristic peaks near 1 kHz and between 3 and 10 kHz when cavitation occurs. The results provide theoretical support for studying the noise of supercavitation vehicles and applying ventilated supercavitation technology.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Computer Science, Artificial Intelligence
Ausnain Naveed, Sahin Sonmez, Saffet Ayasun
Summary: This paper investigates the impacts of an EV aggregator with communication time delay on the stability of load frequency control (LFC) systems. The stability region in the parameter space of the proportional-integral (PI) controller is determined using a graphical method and the stability boundary locus. The effects of communication delay and EV participation factor on the stability regions are thoroughly examined.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES
(2022)
Article
Construction & Building Technology
Yuantian Sun, Guichen Li, Junfei Zhang, Bicheng Yao, Deyu Qian, Jiandong Huang
Summary: The deformation of underground coal roadway, especially the rheological deformation, increases gradually under constant stress with time. In this study, it was found that the rheological deformation of horizontal sidewall accounts for approximately 30% of the overall deformation, and the stable time for such roadway is around 60 days after excavation. The tendency of the roof deformation is similar to the sidewalls, but the floor deformation is different. Recommendations for maintaining the stability of such roadway were proposed, which are valuable for practical applications in the field.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Automation & Control Systems
Yaojie Pan, Yong Chen, Yuezhi Liu, Longjie Zhang, Feng Gao, Qiuan Huang
Summary: This article proposes a dual-mode multiobjective Lyapunov-based economic model-predictive control for constrained nonlinear time-delay systems with external disturbances. The proposed control scheme increases the feasible domain of the initial point of a closed-loop system, while guaranteeing stability. The recursive feasibility and stability analysis of the controller is detailed, showing convergence of the closed-loop system state in a robust invariant set after a finite time.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Automation & Control Systems
Ning Xu, Yun Chen, Anke Xue, Guangdeng Zong
Summary: This paper addresses the problems of finite-time stability and stabilization for continuous-time switched positive linear time-delay systems. By constructing a multiple piecewise copositive Lyapunov-Krasovskii functional, finite-time stability conditions are established, and finite-time stabilization is achieved by designing a state-feedback controller in the form of linear programming. The proposed controller construction approach reduces conservatism.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2022)
Article
Multidisciplinary Sciences
Galal M. Moatimid, T. S. Amer
Summary: This paper investigates the stability analysis of the Van der Pol oscillator under external excitation and proposes a new non-perturbative technique to improve the system and validate the analytical solution using numerical methods. The results show that the solution approaches stability more quickly as damping and natural frequency parameters increase.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Jiaojiao Hu, Qiankun Yang, Shuya Zhu, Yong Zhang, Dingshun Yan, Kefu Gan, Zhiming Li
Summary: This study demonstrates a metastability engineering strategy for toughening superhard high-entropy carbides (HECs) by introducing in-situ metastable ceramic particles. The transformation of metastable tetragonal ZrO2 particles under mechanical loading promotes crack tip shielding mechanisms, leading to enhanced fracture toughness of the HECs.
NATURE COMMUNICATIONS
(2023)
