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Event-triggered adaptive finite-time control for nonlinear systems under asymmetric time-varying state constraints Research Article

Yan Wei, Jun Luo, Huaicheng Yan, Yueying Wang,wyy676@126.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2000692

Abstract: This paper investigates the issue of event-triggered adaptive state-constrained control for multi-input multi-output uncertain nonlinear systems. To prevent asymmetric time-varying from being violated, a tan-type is established to transform the considered system into an equivalent “non-constrained” system. By employing a smooth switch function in the virtual control signals, the singularity in the traditional dynamic surface control can be avoided. Fuzzy logic systems are used to compensate for the unknown functions. A suitable event-triggering rule is introduced to determine when to transmit the control laws. Through Lyapunov analysis, the closed-loop system is proved to be semi-globally practical stable, and the are never violated. Simulations are provided to evaluate the effectiveness of the proposed approach.

Keywords： 事件触发控制；非线性映射；自适应模糊控制；有限时间；状态约束    

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Finite-time leader-follower consensus of a discrete-time system via sliding mode control Research Article

Ruizhuo SONG, Shi XING, Zhen XU

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 7,   Pages 1057-1068 doi: 10.1631/FITEE.2100565

Abstract: In this study, we solve the problem of discrete-time second-order (MASs) under the constraints of external disturbances. First, a novel consensus scheme is designed using a novel theory. Our adaptive controller is designed using the traditional sliding mode reaching law, and its advantages are chatter reduction and invariance to disturbances. In addition, the stability is demonstrated by presenting a discrete Lyapunov function. Finally, simulation results are presented to prove the validity of our theoretical results.

Keywords： Finite-time     Leader-follower consensus     Adaptive sliding mode control     Multi-agent systems    

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Finite-time formation control for first-order multi-agent systems with region constraints Research Articles

Zhengquan Yang, Xiaofang Pan, Qing Zhang, Zengqiang Chen,zquanyang@163.com,1219006322@qq.com,qz120168@hotmail.com,chenzq@nankai.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 1,   Pages 1-140 doi: 10.1631/FITEE.2000177

Abstract: In this study, the control of s with region constraints is studied. Multiple agents have first-order dynamics and a common target area. A novel control algorithm is proposed using local information and interaction. If the communication graph is undirected and connected and the desired framework is rigid, it is proved that the controller can be used to solve the formation problem with a target area. That is, all agents can enter the desired region in finite time while reaching and maintaining the desired formation shapes. Finally, a numerical example is given to illustrate the results.

Keywords： Finite-time formation     Multi-agent system     Asymptotic convergence     Set constraint     Lyapunov theorem    

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Finite-time coordinated path-following control of leader-following multi-agent systems Research Article

Weibin CHEN, Yangyang CHEN, Ya ZHANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 10,   Pages 1511-1521 doi: 10.1631/FITEE.2100476

Abstract:

This paper presents applications of the continuous feedback method to achieve path-following and a formation moving along the desired orbits within a finite time. It is assumed that the topology for the virtual leader and followers is directed. An additional condition of the so-called is designed to make all agents move within a limited area. A novel continuous path-following control law is first designed based on the and backstepping. Then a novel continuous formation algorithm is designed by regarding the path-following errors as disturbances. The settling-time properties of the resulting system are studied in detail and simulations are presented to validate the proposed strategies.

Keywords： Finite-time     Coordinated path-following     Multi-agent systems     Barrier function    

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Stability of Boolean networks with state-dependent random impulses

Ya-wen Shen, Yu-qian Guo, Wei-hua Gui,shenyawen@csu.edu.cn,gyuqian@csu.edu.cn,gwh@csu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 2,   Pages 141-286 doi: 10.1631/FITEE.1900454

Abstract: We investigate the stability of Boolean networks (BNs) with impulses triggered by both states and random factors. A hybrid index model is used to describe impulsive BNs. First, several necessary and sufficient conditions for are obtained. Second, based on the stability criterion of probabilistic BNs and the criterion, the necessary and sufficient conditions for the and the are presented. The relationship between these two kinds of stability is discussed. Last, examples and time-domain simulations are provided to illustrate the obtained results.

Keywords： Boolean network with impulses     Forward completeness     Finite-time stability with probability one     Asymptotical stability in distribution    

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Research on structural health monitoring (SHM) system based on RTK GPS system

Wang Renpeng,Yao Lianbi,Meng Xiaolin

Strategic Study of CAE 2011, Volume 13, Issue 3,   Pages 63-70

Abstract:

For the huge amount of raw data that were obtained during field data acquisition by the real-time kinematic global positioning system (RTK GPS) in structural health monitoring (SHM) system of the Nanpu Bridge in Shanghai, we finished lots of processing works and obtain x-coordinate , y-coordinate,z-coordinate time series of all 12 monitoring station points. The coordinate time series were treated as the multi-outputs of the dynamic system and used to build the state space model and ARMA model and spectrum estimations for the response. The analysis results were consistent with the results of test that completed when the bridge was opened in 1990 and results that forecasted by fine finite element (FE) model. The research illustrated that the state-space model and ARMA model were efficient tools for evaluation of performance of civil structures, and furtherly proved the possibility of building the prototype SHM that based on RTK GPS.

Keywords： RTK GPS system     time series     state-space model     ARMA model     finite element model    

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The Realization of Time-Triggered Control Area Network

Lü Weijie,,Liu Luyuan,Wang Yixin

Strategic Study of CAE 2005, Volume 7, Issue 9,   Pages 40-43

Abstract:

The time-triggered architecture for CAN is analyzed. The implementation issue of time- triggered architecture based on 8052 single-chip processor and CAN controller SJA1000 is designed. The maximum number of transmission messages in basic cycle is given. And the scheduling capability is analyzed. The experiment is based on the automotive engine management, the result proves that using time-triggered architecture can not only manage the message transmission but also improve the bandwidth utilization.

Keywords： time-triggered     time synchronization     CANbus     distributed control systems    

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Two Ways Pseudo Range Time Synchronization for Navigation Satellite Clock

Tan Shusen

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 70-74

Abstract:

Aiming at the demand of time synchronization, the navigation satellite two-way clock pseudo range time synchronization was presented and the application of four basic synchronic ways were analysed in this paper. Comparing with other navigation satellite clock synchronization ways, this way was provided with advantages such as high precision, simplicity and light burden to equipment on satellite and so on. In the first section of the paper the meaning and status of time synchronization of navigation satellite clock were discussed. The error of the navigation satellite clock synchronization affects users' position and precision directly. In the second section two way pseudo range time synchronization theory was introduced, that is to get time error between two stations that is satisfied with the condition △tAB =-tBr-tAr. tAr and tBr are the time of A and B station( or satellite) that receives another station ( or satellite)'s transmitting signal. The difference between them is clock bias. In the third sections pseudo range time synchronization ways introduced. In the fourth, fifth and sixth section of the paper, two way radio pseudo range(TWRPr), two way laser pseudo range(TWLPr) ,two way satellite-relay pseudo range (TWSrPr), and two way earth-relay pseudo range ( TWErP) were analyzed respectively. TWRPr way was provided and RMS = 0.42 ns. TWSrPr three stations time synchronization result was RMS =1.75 ns. In the eighth section the precision that two ways pseudo range time synchronization can reach was summed up, that is TWRPr can reach 1.0 ns. The repeated precision of TWLPr can reach 0.1 ns, and can be used to evaluate the capability of atomic clock and validate the precision of other synchronization method.

Keywords： navigation satellite     pseudo range     time synchronization    

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Slope Stability Analysis by Strength Reduction FEM

Zheng Yingren,Zhao Shangyi,Zhang Luyu

Strategic Study of CAE 2002, Volume 4, Issue 10,   Pages 57-61

Abstract:

An analysis method for slope safety factor through c - cp reduction algorithm by finite elements is presented. When the system reaches instability, the numerical non-convergence occurs simultaneously. The safety factor is then obtained by c - ψ reduction algorithm. The same time, the critical failure surface is found automatically. The traditional limit equilibrium method can't get the safety factor and failure surface of jointed rock slope. Strength Reduction FEM (SRFEM) presents a powerful alternative approach for slope stability analysis, especially to jointed rock slope. This paper analyzes the precision and error caused by different soil yield criterions、FEM itself、slope height、slope angle´cohesion and friction angle thoroughly. Through a series of case studies, the results show average error of safety factor between Strength Reduction FEM and traditional limit equilibrium method (Bishop simplified method) is 3 %～8 %，the error between SRFEM and Spencer's method is 1 %～4 % . The applicability of the proposed method was clearly exhibited.

Keywords： slope stability analysis     strength reduction by FEM     yield criterions    

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Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory

Ying Fuqiang,Pan Xiaoyong,Li Min

Strategic Study of CAE 2007, Volume 9, Issue 7,   Pages 47-52

Abstract:

Gear preforming by cross wedge rolling is an original question for discussion, parameters such as deformation, temperature field and mechanical performance are looking forward to be researched. This paper ties the advantages of preforming by CWR and the principle of generated gear together, and the die suited for gear rolling has been designed. Based on the finite deformation theory, the coupled thermal-mechanical constitutive model of gear rolling by CWR has been established. Then FEM simulation for the forming process has been developed in MSC. SuperForm, and information gained from the simulation has been analyzed also in detail which provide references for further study of gear rolling by CWR technology.

Keywords： cross wedge rolling(CWR)     gear     coupled thermo-mechanical     FEM    

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A Multi-objective Optimization Decision-making Model for Project Time - resource Tradeoff Problem

Wang Xianjia,Wan Zhongping

Strategic Study of CAE 2005, Volume 7, Issue 2,   Pages 35-40

Abstract:

In the project scheduling and management, the time-resource tradeoff problem is to seek the objective of minimizing the project duration and the total consumed-resources cost under the requirement of the absolute due date of project, and determine an efficient project scheduling according to some precedence relationship and the renewable resource constraints. A new multi-objective optimization decision-making model with time-resource tradeoff problem is proposed, in which objective functions with conflict one another are defined as adaptive and adjustable between the project duration and the total consumed-resources cost in all period. A satisfied feasible solution can be obtained in the solution procedure by compromising and adjusting relationship between the project duration and the total consumed-resource cost. A numerical example is illustrated. In addition, some characteristics on this two-player game are given in the corresponding Lagrangian relaxation form associated with the resource constraints.

Keywords： project scheduling management     time-resource tradeoff     multiobject decision-making model     resource-constrained     project scheduling     Lagragian relaxation    

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State space optimization of finite state machines from the viewpoint of control theory Research Article

Jumei Yue, Yongyi Yan, Zengqiang Chen, He Deng,yjm@mail.nankai.edu.cn,yyyan@mail.nankai.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2000608

Abstract: Motivated by the inconvenience or even inability to explain the mathematics of the state of (FSMs) in most existing results, we consider the problem by viewing FSMs as logical dynamic systems. Borrowing ideas from the concept of equilibrium points of dynamic systems in control theory, the concepts of -equivalent states and -source equivalent states are introduced. Based on the state transition dynamic equations of FSMs proposed in recent years, several mathematical formulations of -equivalent states and -source equivalent states are proposed. These can be analogized to the necessary and sufficient conditions of equilibrium points of dynamic systems in control theory and thus give a mathematical explanation of the optimization problem. Using these mathematical formulations, two methods are designed to find all the -equivalent states and -source equivalent states of FSMs. Further, two ways of reducing the state space of FSMs are found. These can be implemented without computers but with only pen and paper in a mathematical manner. In addition, an open question is raised which can further improve these methods into unattended ones. Finally, the correctness and effectiveness of the proposed methods are verified by a practical language model.

Keywords： 有限状态自动机；有限值系统；逻辑系统；逻辑网络；矩阵半张量积；空间优化    

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Study on Finite Element Method for Calculation of Stress on External Ring of One-way Clutch

Luo Yixin,Wu Bo

Strategic Study of CAE 2004, Volume 6, Issue 9,   Pages 56-59

Abstract:

At present there is no appropriate method for calculation of stress on external ring of a one-way clutch. In this paper, according to characteristics of the external ring, the method of finite element analyais has been used, the factors which have influence on computational accuracy have been studied, and the stress on external ring of a five roller-type one-way clutch has been calculated. Studies have shown that finite element analyais is really an attractive method for the calculation of stress on parts similar to external ring.

Keywords： clutch     external ring     stress     finite element    

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An improved ROF denoising model based on time-fractional derivative Research Articles

Xing-ran Liao,xrliao_scu@163.com

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6,   Pages 809-962 doi: 10.1631/FITEE.2000067

Abstract: In this study, we discuss mainly the and texture retention issues. Usually, the has an adjustable fractional order to control the diffusion process, and its memory effect can nicely retain the image texture when it is applied to . Therefore, we design a new Rudin-Osher-Fatemi model with a based on a classical one, where the discretization in space is based on the integer-order difference scheme and the discretization in time is the approximation of the (i.e., Caputo-like difference is applied to discretize the ). Stability and convergence of such an explicit scheme are analyzed in detail. We prove that the numerical solution to the new model converges to the exact solution with the order of (+), where , , and are the time step size, fractional order, and space step size, respectively. Finally, various evaluation criteria including the signal-to-noise ratio, feature similarity, and histogram recovery degree are used to evaluate the performance of our new model. Numerical test results show that our improved model has more powerful denoising and texture retention ability than existing ones.

Keywords： 改进ROF去噪模型；时间分数阶导数；Caputo导数；图像去噪    

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A matrix-based static approach to analysis of finite state machines Research Article

He DENG, Yongyi YAN, Zengqiang CHEN,yyyan@mail.nankai.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 8,   Pages 1239-1246 doi: 10.1631/FITEE.2100561

Abstract: Traditional matrix-based approaches in the field of construct state transition matrices, and then use the powers of the state transition matrices to represent corresponding dynamic transition processes, which are cornerstones of system analysis. In this study, we propose a static matrix-based approach that revisits a finite state machine from its structure rather than its dynamic transition process, thus avoiding the "explosion of complexity" problem inherent in the existing approaches. Based on the static approach, we reexamine the issues of closed-loop detection and controllability for deterministic . In addition, we propose controllable equivalent form and minimal controllable equivalent form concepts and give corresponding algorithms.

Keywords： Logical systems     Finite-valued systems     Semi-tensor product of matrices     Finite state machines     Matrix approaches    

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Title Author Date Type Operation

Event-triggered adaptive finite-time control for nonlinear systems under asymmetric time-varying state constraints

Yan Wei, Jun Luo, Huaicheng Yan, Yueying Wang,wyy676@126.com

Journal Article

Finite-time leader-follower consensus of a discrete-time system via sliding mode control

Ruizhuo SONG, Shi XING, Zhen XU

Journal Article

Finite-time formation control for first-order multi-agent systems with region constraints

Zhengquan Yang, Xiaofang Pan, Qing Zhang, Zengqiang Chen,zquanyang@163.com,1219006322@qq.com,qz120168@hotmail.com,chenzq@nankai.edu.cn

Journal Article

Finite-time coordinated path-following control of leader-following multi-agent systems

Weibin CHEN, Yangyang CHEN, Ya ZHANG

Journal Article

Stability of Boolean networks with state-dependent random impulses

Ya-wen Shen, Yu-qian Guo, Wei-hua Gui,shenyawen@csu.edu.cn,gyuqian@csu.edu.cn,gwh@csu.edu.cn

Journal Article

Research on structural health monitoring (SHM) system based on RTK GPS system

Wang Renpeng,Yao Lianbi,Meng Xiaolin

Journal Article

The Realization of Time-Triggered Control Area Network

Lü Weijie,,Liu Luyuan,Wang Yixin

Journal Article

Two Ways Pseudo Range Time Synchronization for Navigation Satellite Clock

Tan Shusen

Journal Article

Slope Stability Analysis by Strength Reduction FEM

Zheng Yingren,Zhao Shangyi,Zhang Luyu

Journal Article

Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory

Ying Fuqiang,Pan Xiaoyong,Li Min

Journal Article

A Multi-objective Optimization Decision-making Model for Project Time - resource Tradeoff Problem

Wang Xianjia,Wan Zhongping

Journal Article

State space optimization of finite state machines from the viewpoint of control theory

Jumei Yue, Yongyi Yan, Zengqiang Chen, He Deng,yjm@mail.nankai.edu.cn,yyyan@mail.nankai.edu.cn

Journal Article

Study on Finite Element Method for Calculation of Stress on External Ring of One-way Clutch

Luo Yixin,Wu Bo

Journal Article

An improved ROF denoising model based on time-fractional derivative

Xing-ran Liao,xrliao_scu@163.com

Journal Article

A matrix-based static approach to analysis of finite state machines

He DENG, Yongyi YAN, Zengqiang CHEN,yyyan@mail.nankai.edu.cn

Journal Article