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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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Adaptive tracking control for air-breathing hypersonic vehicles with state constraints Article

Gong-jun LI

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 5,   Pages 599-614 doi: 10.1631/FITEE.1500464

Abstract: We investigate the adaptive tracking problem for the longitudinal dynamics of state-constrained airbreathing hypersonic vehicles, where not only the velocity and the altitude, but also the angle of attack (AOA) is required to be tracked. A novel indirect AOA tracking strategy is proposed by viewing the pitch angle as a new output and devising an appropriate pitch angle reference trajectory. Then based on the redefined outputs (i.e., the velocity, the altitude, and the pitch angle), a modified backstepping design is proposed where the barrier Lyapunov function is used to solve the state-constrained control problem and the control gain of this class of systems is unknown. Stability analysis is given to show that the tracking objective is achieved, all the closed-loop signals are bounded, and all the states always satisfy the given constraints. Finally, numerical simulations verify the effectiveness of the proposed approach.

Keywords： Hypersonic vehicle     Constraints     Output redefinition     Barrier Lyapunov function    

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Fixed-time constrained acceleration reconstruction scheme for robotic exoskeleton via neural networks Research

Tao Xue, Zi-wei Wang, Tao Zhang, Ou Bai, Meng Zhang, Bin Han,taozhang@tsinghua.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 5,   Pages 649-808 doi: 10.1631/FITEE.1900418

Abstract: Accurate acceleration acquisition is a critical issue in the system, but it is difficult to directly obtain the acceleration via the existing sensing systems. The existing algorithm-based acceleration acquisition methods put more attention on finite-time convergence and disturbance suppression but ignore the error constraint and s. To this end, a novel radical bias function neural network (RBFNN) based fixed-time reconstruction scheme with error constraints is designed to realize high-performance acceleration estimation. In this scheme, a novel exponential-type is proposed to handle the error constraints. It also provides a unified and concise Lyapunov stability-proof template for constrained and non-constrained systems. Moreover, a fractional power sliding mode control law is designed to realize , where the convergence time is irrelevant to initial states or external disturbance, and depends only on the chosen parameters. To further enhance observer robustness, an RBFNN with the adaptive weight matrix is proposed to approximate and attenuate the completely unknown disturbances. Numerical simulation and human subject experimental results validate the unique properties and practical robustness.

Keywords： 加速度重构；固定时间收敛；约束控制；障碍李雅普诺夫函数；初始状态无关方法；外骨骼机器人    

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A Study About IC and IR in Principal-gent RelationshipUnder the Engineer Supervision Institution

Qin Xuan

Strategic Study of CAE 2007, Volume 9, Issue 4,   Pages 45-49

Abstract:

According to principal-agent theory, the Incentive compatibility constraint(IC)and the participation constraint (IR) in principal-gent relationship between employer and engineer are analyzed. The conclusions are drawn:The incentive compatibility constraint (IC) is more important than participation constraint (IR), If the mechanism doesn't satisfy the needs of IC, then it will be inefficient. If the employer wants to improve the engineer supervision institution, it must adopt incentive mechanisms which can make the engineer work hard, in the mean time the incentive mechanisms play efficient roles in solving the moral hazard.  This paper will provide some implications for engineer supervision development in China.

Keywords： engineer supervision     employer     engineer     principal-gent     incentive compatibility constraint(IC)     participation constraint(IR)    

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Pulse Transiently Chaotic Neural Network for Nonlinear Constrained Optimization

Li Ying,Cao Hongzhao,Hu Yunchang,Shang Xiuming

Strategic Study of CAE 2004, Volume 6, Issue 5,   Pages 45-48

Abstract:

Pulse Transiently Chaotic Neural Network (PTCNN) can find almost all optima including the part optima and the global with its abundance dynamical characteristic, when is used in nonlinear non-constrained optimization. The optimization problem is first unconstrained by virtue of non-differentiable exact penalty function, and is further solved by PTCNN. It is showed by an example that this method is efficient.

Keywords： PTCNN     penalty function     nonlinear constrained optimization    

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Vibration-Driven Microrobot Positioning Methodologies for Nonholonomic Constraint Compensation Article

Kostas Vlachos, Dimitris Papadimitriou, Evangelos Papadopoulos

Engineering 2015, Volume 1, Issue 1,   Pages 66-72 doi: 10.15302/J-ENG-2015016

Abstract:

This paper presents the formulation and practical implementation of positioning methodologies that compensate for the nonholonomic constraints of a mobile microrobot that is driven by two vibrating direct current (DC) micromotors. The open-loop and closed-loop approaches described here add the capability for net sidewise displacements of the microrobotic platform. A displacement is achieved by the execution of a number of repeating steps that depend on the desired displacement, the speed of the micromotors, and the elapsed time. Simulation and experimental results verified the performance of the proposed methodologies.

Keywords： microrobotics     vibration micromotor     actuation nonholonomic planning     nonholonomic constraints compensation    

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Present Situation and Future Prospects of Child Restraint Systems for Vehicles

Fang Yuan,Wu Guangqiang

Strategic Study of CAE 2006, Volume 8, Issue 8,   Pages 81-85

Abstract:

Child restraint system(CRS)is a new study field in the world. Especially in China, the CRS research is particularly meaningful with the rapid growth of the number of child passengers. The amendment and optimization on the regulations of CRS are brought out based on the distinction between CRS and occupant safety systems. The application of advanced design theory, the technology of computer simulation and the systematical analysis strategy will bring a new prospect for the development of CRS.

Keywords： child restraint system     safety chair     sled test     injury criteria     rating program    

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Code design for run-length control in visible light communication Research Articles

Zong-yan Li, Hong-lu Yu, Bao-ling Shan, De-xuan Zou, Shi-yin Li,lizongyan@cumt.edu.cn,yuhonglu1993@126.com,baoling.shan@student.uts.edu.au

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 9,   Pages 1397-1411 doi: 10.1631/FITEE.1900526

Abstract: Run-length limited (RLL) codes can facilitate reliable data transmission and provide flicker-free illumination in (VLC) systems. We propose novel high-rate RLL codes, which can improve error performance and mitigate flicker. Two RLL coding schemes are developed by designing the to further enhance the coding gain by improving the and using the state-splitting method to realize small state numbers. In our RLL code design, the construction of the codeword set is critical. This codeword set is designed considering the set-partitioning algorithm criterion. The flicker control and of the various proposed RLL codes are described in detail, and the flicker performances of different codes are compared based on histograms. Simulations are conducted to evaluate the proposed RLL codes in on-off keying modulation VLC systems. Simulation results demonstrate that the proposed RLL codes achieve superior error performance to the existing RLL codes.

Keywords： Visible light communication     Run-length limited codes     Finite-state machine     Minimum Hamming distance    

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Optimal two-impulse space interception with multiple constraints Research Articles

Li Xie, Yi-qun Zhang, Jun-yan Xu,lixie@ncepu.edu.cn,yiqunzhang@hotmail.com,junyan_Xu@sina.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 7,   Pages 963-1118 doi: 10.1631/FITEE.1800763

Abstract: We consider optimal two-impulse with . The are imposed on the terminal position of a space interceptor, impulse and impact instants, and the component-wise magnitudes of velocity impulses. These optimization problems are formulated as and solved by the calculus of variations. Slackness variable methods are used to convert all inequality constraints into equality constraints so that the Lagrange multiplier method can be used. A new is presented. As a result, an indirect optimization method is developed. Subsequently, our method is used to solve the two-impulse of free-flight ballistic missiles. A number of conclusions for have been drawn based on highly accurate numerical solutions. Specifically, by numerical examples, we show that when time and velocity impulse constraints are imposed, optimal two-impulse solutions may occur; if two-impulse instants are free, then a two-impulse space interception problem with velocity impulse constraints may degenerate to a one-impulse case.

Keywords： 空间拦截问题；变分法；多约束；两速度脉冲；多点边值问题；局部最优解；动态松弛变量法    

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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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Low complexity robust adaptive beamforming for general-rank signal model with positive semidefinite constraint Article

Yu-tang ZHU,Yong-bo ZHAO,Jun LIU,Peng-lang SHUI

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 11,   Pages 1245-1252 doi: 10.1631/FITEE.1601112

Abstract: We propose a low complexity robust beamforming method for the general-rank signal model, to combat against mismatches of the desired signal array response and the received signal covariance matrix. The proposed beamformer not only considers the norm bounded uncertainties in the desired and received signal covariance matrices, but also includes an additional positive semidefinite constraint on the desired signal covariance matrix. Based on the worst-case performance optimization criterion, a computationally simple closed-form weight vector is obtained. Simulation results verify the validity and robustness of the proposed beamforming method.

Keywords： Beamforming     General-rank     Low complexity     Positive semidefinite (PSD) constraint     Model mismatches    

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Hohmann transfer via constrained optimization None

Li XIE, Yi-qun ZHANG, Jun-yan XU

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 11,   Pages 1444-1458 doi: 10.1631/FITEE.1800295

Abstract:

Inspired by the geometric method proposed by Jean-Pierre MAREC, we first consider the Hohmann transfer problem between two coplanar circular orbits as a static nonlinear programming problem with an inequality constraint. By the Kuhn-Tucker theorem and a second-order sufficient condition for minima, we analytically prove the global minimum of the Hohmann transfer. Two sets of feasible solutions are found: one corresponding to the Hohmann transfer is the global minimum and the other is a local minimum. We next formulate the Hohmann transfer problem as boundary value problems, which are solved by the calculus of variations. The two sets of feasible solutions are also found by numerical examples. Via static and dynamic constrained optimizations, the solution to the Hohmann transfer problem is re-discovered, and its global minimum is analytically verified using nonlinear programming.

Keywords： Hohmann transfer     Nonlinear programming     Constrained optimization     Calculus of variations    

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Behavior of Concrete Under the Triaxial Compression

Yan Dongming,Lin Gao

Strategic Study of CAE 2007, Volume 9, Issue 6,   Pages 64-70

Abstract:

  Experimental tests on 10 mm cubic concrete specimens were carried out using the servo hydraulic testing machine.  Specimens subjected to equal constant confining pressures of 0, 4 MPa, 8 MPa, 12 MPa and 16 MPa respectively were conducted to investigate the deformation and strength characteristics of concrete.  In addition, strength properties of concrete under unequal confining pressures were also investigated. Based on the test results it was revealed that the ultimate strength increases dramatically with the increasing confining pressure and the strain at peak stress increases even more pronounced. With the increasing minor principal stresses, the enhancement effect of middle principal stresses on the ultimate strength became weak.  The complete stress- strain curves were obtained at different confining pressures.  By comparison with the current literature,  appropriate formulas of concrete strength and deformation were proposed for the engineering purpose.

Keywords： triaxial stress state     confining pressure     ultimate strength     deformation     concrete    

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The Method and Formula for Stability Factor of Slope with State of Soil Original Stress

Wang Guoti

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 80-84

Abstract:

The methods for analysis of stability of slope are usually considered, developed and improved along the line of finite slice method. But the safety factor of stability is facing challenge in engineering application. Because of the state of original stress in soil is ignored and disfigurement of finite slice method is in existence at all time. In different conditions of soil consolidation, K0, the lateral stress coefficient of soil state, has influenced the property of soil and excavation of slope. In this paper, in consideration of the state of soil original stress, the calculating formula for safety factor have been given with applying Coulomb's equation for shear strength of soil and Mohr - Coulomb rule. There are many examples of safety factor using the formula of this paper, which have been calculated and compared with finite slice methods selected from reference literatures. The formula have showed their clear concept, simple calculation and dependable result. They can be used in engineering.

Keywords： ateral stress coefficient K0     state of original stress     formula of safety factor of stability    

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Green Strategy of Industrial Development in the Qinba Mountain Area under Ecological and Environmental Limitations

Xu Delong,Li Hui,Zhou Yuan,Cao Yunlong,Miao Jinxiang and Sun Jingwei

Strategic Study of CAE 2016, Volume 18, Issue 5,   Pages 68-73 doi: 10.15302/J-SSCAE-2016.05.010

Abstract:

As the main national ecological function area and the biggest poverty alleviation area, the Qinba Mountain Area is facing the arduous task of ecological protection and the urgent need for improving people's livelihood. Based on the analysis of the present situation and the problems of industrial development in the Qinba Mountain Area, together with the advantages of local resources and environment, this paper proposes an overall perspective, specific strategies, and safeguard measures on how to realize the green development, transformation, and upgrading of the industries in this area under ecological and environmental limitations, which will provide reference for the future development of regional industries in this area.

Keywords： the Qinba Mountain Area     environmental limitations     industry     green development    

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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

Adaptive tracking control for air-breathing hypersonic vehicles with state constraints

Gong-jun LI

Journal Article

Fixed-time constrained acceleration reconstruction scheme for robotic exoskeleton via neural networks

Tao Xue, Zi-wei Wang, Tao Zhang, Ou Bai, Meng Zhang, Bin Han,taozhang@tsinghua.edu.cn

Journal Article

A Study About IC and IR in Principal-gent RelationshipUnder the Engineer Supervision Institution

Qin Xuan

Journal Article

Pulse Transiently Chaotic Neural Network for Nonlinear Constrained Optimization

Li Ying,Cao Hongzhao,Hu Yunchang,Shang Xiuming

Journal Article

Vibration-Driven Microrobot Positioning Methodologies for Nonholonomic Constraint Compensation

Kostas Vlachos, Dimitris Papadimitriou, Evangelos Papadopoulos

Journal Article

Present Situation and Future Prospects of Child Restraint Systems for Vehicles

Fang Yuan,Wu Guangqiang

Journal Article

Code design for run-length control in visible light communication

Zong-yan Li, Hong-lu Yu, Bao-ling Shan, De-xuan Zou, Shi-yin Li,lizongyan@cumt.edu.cn,yuhonglu1993@126.com,baoling.shan@student.uts.edu.au

Journal Article

Optimal two-impulse space interception with multiple constraints

Li Xie, Yi-qun Zhang, Jun-yan Xu,lixie@ncepu.edu.cn,yiqunzhang@hotmail.com,junyan_Xu@sina.cn

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

Low complexity robust adaptive beamforming for general-rank signal model with positive semidefinite constraint

Yu-tang ZHU,Yong-bo ZHAO,Jun LIU,Peng-lang SHUI

Journal Article

Hohmann transfer via constrained optimization

Li XIE, Yi-qun ZHANG, Jun-yan XU

Journal Article

Behavior of Concrete Under the Triaxial Compression

Yan Dongming,Lin Gao

Journal Article

The Method and Formula for Stability Factor of Slope with State of Soil Original Stress

Wang Guoti

Journal Article

Green Strategy of Industrial Development in the Qinba Mountain Area under Ecological and Environmental Limitations

Xu Delong,Li Hui,Zhou Yuan,Cao Yunlong,Miao Jinxiang and Sun Jingwei

Journal Article