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Lin Huang,Tingwen Guo,Yongjian Zhou,Dong Han,Yu Gu,Cheng Song,Feng Pan 한국자기학회 2022 Journal of Magnetics Vol.27 No.4
The casting process of Fe-Ni Invar alloy could drastically affect magnetic properties and thermal expansion. We have observed analogous trends of saturation magnetization and thermal expansion coefficient in two distinct types of casted samples, as we perform post-annealing at different temperatures. X-ray diffraction measurements show that all the alloys remain in the same face-centered cubic structure after different heat treatments without phase transformation. With the help of X-ray diffraction and differential thermal analysis, we have inferred that these changes in properties might be induced by magnetic lattice transitions and analyzed the possible reason for property differences in samples. This work delivers a perspective on the relationships between thermal expansion, magnetic properties, and heat treatments, which could help to improve the industrial assembly line design.
Wanli Zhang,Chuandong Li,Tingwen Huang,Junjian Huang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
This paper investigates finite-time synchronization of neural networks (NNs) with multiple proportional delays. In order to cope with the difficulties induced by multiple proportional delays, suitable nonlinear variable transformations and new 1-norm-based analytical techniques are developed. By constructing Lyapunov functional and designing new designed controllers, several new sufficient conditions are derived to realize synchronization in finite time. Moreover, estimation of the upper bound of synchronization time is also provided for NNs with bounded delays or proportional delays. The designed controllers without sign function are simple, which means the chattering phenomenon in most of the existing results can be overcome. A numerical simulation is offered to verify the effectiveness of the theoretical analysis.
Comparison System Method for a class of Stochastic Systems with Variable-time Impulses
Jie Tan,Chuandong Li,Tingwen Huang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
This paper studies the stability of stochastic impulsive systems with variable-time impulses. We consider the case that the trajectory of the stochastic system intersects each surface of discontinuity exactly once. Then we shall show that under the well-selected conditions the variable-time impulsive systems can be reduced to the fixed-time impulsive systems with impulse time window. By using comparison method, we obtain two theorems to determine the different impulsive time windows for stable and unstable stochastic dynamical systems, respectively. The effectiveness of the theoretical results are illustrated by two numerical examples.
Stability of Impulsive Systems with Time Window via Comparison Method
Chuandong Li,Jie Tan,Tingwen Huang 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6
The stability of impulsive systems with time window is studied via comparison method. Two theorems are obtained to determine the different impulsive time windows for stable and unstable continuous dynamical systems, respectively. The effectiveness of the theoretical results are illustrated by two numerical examples.
Shiping Wen,Zhigang Zeng,Tingwen Huang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.4
This paper is concerned with the problem of reliable H∞ filter design for a class of mixed-delay Markovian jump systems with stochastic nonlinearities and multiplicative noises. The mixed delays comprise both discrete time-varying delay and distributed delay. The stochastic nonlinearities in the form of statistical means cover several well-studied nonlinear functions. And the multiplicative disturbances are in the form of a scalar Gaussian white noise with unit variance. Furthermore, the failures of sensors are quantified by a variable varying in a given interval. A filter is designed to guarantee that the dynamics of the estimation error is asymptotically mean-square stable. Sufficient conditions for the existence of such a filter are obtained by using a new Lyapunov-Krasovskii functional and delay-partitioning method. Then a linear matrix inequality (LMI) approach for designing such a reliable H∞ filter is presented. Finally, the effectiveness of the proposed approach is demonstrated by a numerical example.
Chuandong Li,Shiju Yang,Tingwen Huang 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
In this paper, the effect of parameter mismatch on the impulsive synchronization for TS fuzzy modelof memristor-based chaotic system is investigated and some new and useful criteria are derived. Moreover, usingthe linear decomposition and comparison system methods, the global quasisynchronization for memristor-basedchaotic systems based on the TS fuzzy model in the presence of parameter mismatch is discussed. Finally, numericalsimulation results are presented to illustrate the effectiveness of the theoretical results.
Three-dimensional Spatiotemporal Accessible Solitons in a PT-symmetric Potential
Wei-Ping Zhong,Milivoj R. Belić,Tingwen Huang 한국광학회 2012 Current Optics and Photonics Vol.16 No.4
Utilizing the three-dimensional Snyder–Mitchell model with a PT-symmetric potential, we study the influence of PT symmetry on beam propagation in strongly nonlocal nonlinear media. The complex Coulomb potential is used as the PT-symmetric potential. A localized spatiotemporal accessible soliton solution of the model is obtained. Specific values of the modulation depth for different soliton parameters are discussed. Our results reveal that in these media the localized solitons can exist in various shapes,such as single-layer and multi-layer disk-shaped structures, as well as vortex-ring and necklace patterns.
Event-triggered Stabilization of Linear Time-delay Systems by Static Output Feedback Control
Xiaoli Wang,Peng Xiang,Wenfeng Hu,Tingwen Huang 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
In this paper, we study the stabilization problem for a class of linear systems with a time-varying state delay. An event-triggered static output feedback controller is proposed, such that the sampling frequency and the update time of the controller are both lowered. First, we present a novel event-triggering mechanism depending not only on the output but also on an exponential term, with which less sampling is required and Zeno behavior can be excluded at the same time. Some sufficient conditions are then obtained, under which an exponential convergence can be achieved by means of the comparison principle approach. It is further shown that the parameters design can be easily given if the case reduces to the state feedback control. Moreover, two examples are presented to show the effectiveness of the results.
Stability of Nonlinear Systems with Variable-time Impulses: B-equivalence Method
Chuandong Li,Yinghua Zhou,Hui Wang,Tingwen Huang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5
This paper addresses the stability problem of nonlinear systems with variable-time impulses. By Bequivalencemethod, we shall show that under the well-selected conditions each solution of the considered systemswill intersect each surface of discontinuity exactly once, and that the considered systems can be reduced to the fixedtimeimpulsive ones, which can be regarded as the comparison systems of the considered variable-time impulsivesystems. Based on the stability theory of fixed-time impulsive systems, we propose a set of stability criteria for thevariable-time impulsive systems. The theoretical results are illustrated by impulsive stabilization of Chua circuit.
Chen, Xiangyong,Cao, Jinde,Park, Ju H.,Huang, Tingwen,Qiu, Jianlong Elsevier 2018 Journal of the Franklin Institute Vol.355 No.5
<P><B>Abstract</B></P> <P>By considering network transmission mode, this paper addresses the finite-time multi-switching synchronization problem for two kinds of multiple chaotic systems. For multiple same-order chaotic systems, we construct the general switching rules and analyze the existence of switching cases. The presented schemes guarantee the states of each derive system to be finite-timely synchronized with the desired states of every respond system in the different transmission paths and switching sequences. For multiple different order chaotic systems, we analyze a special multi-switching hybrid synchronization behavior, where part of the states are completely synchronized and the others belong to combination synchronization. Moveover, the easily verifiable criterion is derived for such synchronization. Finally, numerical examples are given to show the effectiveness of the presented theoretical results.</P>