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| 1 | Research on robust fault-tolerant control for networked control system with packet dropout显示文摘A kind of networked control system with network-induced delay and packet dropout, modeled on asynchronous dynamical systems was tested, and the integrity design of the networked control system with sensors failures and actuators failures was analyzed using hybrid systems technique based on the robust fault-tolerant control theory. The parametric expression of controller is given based on the feasible solution of linear matrix inequality. The simulation results are provided on the basis of detailed theoretical analysis, which further demonstrate the validity of the proposed schema. | Huo Zhihong Fang Huajing | 2007 | Journal of Systems Engineering and Electronics2007，18，1： | 50 |
| 2 | Improvement for consensus performance of multi-agent systems based on delayed-state-derivative feedback显示文摘The delayed-state-derivative feedback (DSDF) is introduced into the existing consensus protocol to simultaneously improve the robustness to communication delay and accelerate the convergence speed of achieving the consensus. The frequency-domain analysis, together with the algebra graph the- ory, is employed to derive the sufficient and necessary condition guaranteeing the average consensus. It is shown that introducing the DSDF with the proper intensity in the existing consensus protocol can improve the robustness to communication delay. By analyzing the effect of DSDF on the closed-loop poles, this paper proves that for a supercritical-delay multi-agent system, this strategy can also accelerate the convergence speed of achieving the consensus with provided the proper intensity of the DSDF. Simulations are provided to demonstrate the effectiveness of the theoretical results. | Zhihai Wu Huajing Fang | 2012 | Journal of Systems Engineering and Electronics2012，23，1： | 6 |
| 3 | Second-order consensus in networks of dynamic agents with communication time-delays显示文摘This paper proposes second-order consensus protocols with time-delays and gives the measure of the robustness of the protocols to the time-delay existing in the network of agents with second-order dynamics. By employing a frequency domain method, it is proven that the information states and their time derivatives of all the agents in the network achieve consensus asymptotically, respectively, for appropriate communication timedelay if the topology of weighted network is connected. Particularly, a tight upper bound on the communication time-delay that can be tolerated in the dynamic network is found. The consensus protocols are distributed in the sense that each agent only needs information from its neighboring agents, which reduces the complexity of connections between neighboring agents significantly. Numerical simulation results are provided to demonstrate the effectiveness and the sharpness of the theoretical results for second-order consensus in networks in the presence of communication time-delays. | Bo Yang1,2, Huajing Fang3, and Hua Wang4 1. School of Navigation, Wuhan University of Technology, Wuhan 430063, P. R. China 2. Wuhan Second Ship Design and Research Institute, Wuhan 430064, P. R. China 3. Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China 4. Department of Aerospace and Mechanical Engineering, Boston University, Boston MA02215, USA | 2010 | Journal of Systems Engineering and Electronics2010，21，1： | 5 |
| 4 | Research on fault-tolerant control of networked control systems based on information scheduling显示文摘A kind of networked control system is studied; the networked control system with noise disturbance is modeled based on information scheduling and control co-design. Augmented state matrix analysis method is introduced, and robust fault-tolerant control problem of networked control systems with noise disturbance under actuator failures is studied. The parametric expression of the controller under actuator failures is given. Furthermore, the result is analyzed by simulation tests, which not only satisfies the networked control systems stability, but also decreases the data information number in network channel and makes full use of the network resources. | Huo Zhihong Zhang Zhixue Fang Huajing | 2008 | Journal of Systems Engineering and Electronics2008，19，5： | 4 |
| 5 | Stochastic stabilization analysis of networked control systems显示文摘Considering the stochastic delay problems existing in networked control systems, a new control mode is proposed for networked control systems whose delay is longer than a sampling period. Under the control mode, the mathematical model of such a system is established. A stochastic stabilization condition for the system is given. The maximum delay can be derived from the stabilization condition. | Ma Changlin Fang Huajing | 2007 | Journal of Systems Engineering and Electronics2007，18，1： | 4 |
| 6 | On 3-colorability of planar graphs without adjacent short cycles显示文摘A short cycle means a cycle of length at most 7.In this paper,we prove that planar graphs without adjacent short cycles are 3-colorable.This improves a result of Borodin et al.(2005). | WANG YingQian 1,MAO XiangHua 1,LU HuaJing 2 & WANG WeiFan 1 1 College of Mathematics,Physics and Information Engineering,Zhejiang Normal University,Jinhua 321004,China 2 College of Basic Science,Ningbo Dahongying University,Ningbo 315175,China | 2010 | Science China Mathematics2010，53，4： | 4 |
| 7 | Fuzzy controller design for networked control system with time-variant delays显示文摘Networked control system is new hot-point in control engineering. A new delayed model for networked control systems is presented, based on which an LQR controller is designed. A method of delays estimation online is also given. For the difficulty on implementation of LQR in NCSs with time-variant delays, the Mamdani intelligent logic with LQR controller is addressed. The stability of the networked control system is also given. Simulation results prove that the novel controller can make the system stable and robustly preserve the performance in terms of time-variant delays. | Li Zhang Fang Huajing | 2006 | Journal of Systems Engineering and Electronics2006，17，1： | 4 |
| 8 | Fault detection for networked systems subject to access constraints and packet dropouts显示文摘This paper addresses the problem of fault detection(FD) for networked systems with access constraints and packet dropouts.Two independent Markov chains are used to describe the sequences of channels which are available for communication at an instant and the packet dropout process,respectively.Performance indexes H∞ and H_ are introduced to describe the robustness of residual against external disturbances and sensitivity of residual to faults,respectively.By using a mode-dependent fault detection filter(FDF) as residual generator,the addressed FD problem is converted into an auxiliary filter design problem with the above index constraints.A sufficient condition for the existence of the FDF is derived in terms of certain linear matrix inequalities(LMIs).When these LMIs are feasible,the explicit expression of the desired FDF can also be characterized.A numerical example is exploited to show the usefulness of the proposed results. | Xiongbo Wan Huajing Fang Sheng Fu | 2011 | Journal of Systems Engineering and Electronics2011，22，1： | 3 |
| 9 | Modified state prediction algorithm based on UKF显示文摘The state prediction based on the unscented Kalman filter(UKF) for nonlinear stochastic discrete-time systems with linear measurement equation is investigated.Predicting future states by using the information of available measurements is an effective method to solve time delay problems.It not only helps the system operator to perform security analysis,but also allows more time for operator to take better decision in case of emergency.In addition, predictive state can make the system implement real-time monitoring and achieve good robustness.UKF has been popular in state prediction because of its advantages in handling nonlinear systems. However,the accuracy of prediction degrades notably once a filter uses a much longer future prediction.A confidence interval (CI) is proposed to overcome the problem.The advantages of CI are that it provides the information about states coverage,which is useful for treatment-plan evaluation,and it can be directly used to specify the margin to accommodate prediction errors.Meanwhile, the CI of prediction errors can be used to correct the predictive state,and thereby it improves the prediction accuracy.Simulations are provided to demonstrate the effectiveness of the theoretical results. | Zhen Luo Huajing Fang | 2013 | Journal of Systems Engineering and Electronics2013，24，1： | 3 |
| 10 | Fast consensus seeking for multi-agent systems显示文摘For multi-agent systems based on the local information,the agents automatically converge to a common consensus state and the convergence speed is determined by the algebraic connectivity of the communication network.To study fast consensus seeking problems of multi-agent systems in undirected networks,a consensus protocol is proposed which considers the average information of the agents' states in a certain time interval,and a consensus convergence criterion for the system is obtained.Based on the frequency-domain analysis and algebra graph theory,it is shown that if the time interval is chosen properly,then requiring the same maximum control effort the proposed protocol reaches consensus faster than the standard consensus protocol.Simulations are provided to demonstrate the effectiveness of these theoretical results. | Yingying She Huajing Fang | 2011 | Journal of Systems Engineering and Electronics2011，22，3： | 3 |
| 11 | Multi-agent consensus with time-varying delays and switching topologies显示文摘The consensus problems of multi-agents with timevarying delays and switching topologies are studied. First, assume that an agent receives state information from its neighbors with fixed communication delays and processes its own state information with time-varying self-delay respectively. The state time-delay feedback is introduced into the existing consensus protocol to begenerate an improved protocol. Then a sufficient condition is derived which can make the system with time-varying self-delays achieve the consensus. On this basis, a specific form of consensus equilibrium influenced by the initial states of agents, timedelays and state feedback intensity is figured out. In addition, the multi-agent consensus is considered with time-varying topologies.Finally, simulations are presented to illustrate the validity of theoretical results. | Jia Wei Huajing Fang | 2014 | Journal of Systems Engineering and Electronics2014，25，3： | 3 |
| 12 | Stability of networked control systems with multi-step delay based on time-division algorithm显示文摘A new control mode is proposed for a networked control system whose network_induced delay is longer than a sampling period. A time_division algorithm is presented to implement the control and for the mathematical modeling of such networked control system. The infinite horizon controller is designed, which renders the networked control system mean square exponentially stable. Simulation results show the validity of the proposed theory. | Changlin MA Huajing FANG | 2005 | 控制理论与应用(英文版)2005，3，4： | 3 |
| 13 | H_∞-based fault detection for nonlinear networked systems with random packet dropout and probabilistic interval delay显示文摘The fault detection problem for the nonlinear networked control system(NCS) with packet dropout and delay is investigated.A nonlinear stochastic system model is proposed to account for the NCS with random packet dropout and networkinduced non-uniformly distributed time-varying delay in both from sensor to controller(S/C) and from controller to actuator(C/A).Based on the obtained NCS model,employing an observer-based fault detection filter as the residual generator,the addressed fault detection problem is converted into an auxiliary nonlinear H∞ control problem.Then,with the help of Lyapunov functional approach,a sufficient condition for the desired fault detection filter is constructed in terms of certain linear matrix inequalities,which depend on not only the delay interval but also the delay interval occurrence rate and successful packet communication rate.Especially,a trade-off phenomenon between the maximum allowable delay bound and successful data packet transmission rate is found,which is typically resulted from the limited bandwidth of communication networks.The effectiveness of the proposed method is demonstrated by a simulation example. | Yong Zhang Huajing Fang Zhen Luo | 2011 | Journal of Systems Engineering and Electronics2011，22，5： | 3 |
| 14 | Leader-following coordination of multi-agent systems with information feedback显示文摘Based on the strategy of information feedback from followers to the leader,flocking control of a group of agents with a leader is studied.The leader tracks a pre-defined trajectory and at the same time the leader uses the feedback information from followers to the leader to modify its motion.The advantage of this control scheme is that it reduces the tracking errors and improves the robustness of the team cohesion to followers' faults.The results of simulation are provided to illustrate that information feedback can improve the performance of the system. | Wang Dongmei Fang Huajing | 2009 | Journal of Systems Engineering and Electronics2009，20，4： | 3 |
| 15 | A Hybrid Conjugate Gradient Algorithm for Solving Relative Orientation of Big Rotation Angle Stereo Pair显示文摘The fast convergence without initial value dependence is the key to solving large angle relative orientation.Therefore,a hybrid conjugate gradient algorithm is proposed in this paper.The concrete process is:①stochastic hill climbing(SHC)algorithm is used to make a random disturbance to the given initial value of the relative orientation element,and the new value to guarantee the optimization direction is generated.②In local optimization,a super-linear convergent conjugate gradient method is used to replace the steepest descent method in relative orientation to improve its convergence rate.③The global convergence condition is that the calculation error is less than the prescribed limit error.The comparison experiment shows that the method proposed in this paper is independent of the initial value,and has higher accuracy and fewer iterations. | Jiatian LI Congcong WANG Chenglin JIA Yiru NIU Yu WANG Wenjing ZHANG Huajing WU Jian LI | 2020 | Journal of Geodesy and Geoinformation Science2020，3，2： | 2 |
| 16 | Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx(MXene)Addition for Enhanced Electrochromic Performance显示文摘Electrochromic technology plays a significant role in energy conservation,while its performance is greatly limited by the transport behavior of ions and electrons.Hence,an electrochromic system with overall excellent performances still need to be explored.Initially motivated by the high ionic and electronic conductivity of transition metal carbide or nitride(MXene),we design a feasible procedure to synthesize the MXene/WO3−x composite electrochromic film.The consequently boosted electrochromic performances prove that the addition of MXene is an effective strategy for simultaneously enhancing electrons and ions transport behavior in electrochromic layer.The MXene/WO3−x electrochromic device exhibits enhanced transmittance modulation and coloration efficiency(60.4%,69.1 cm^2 C^−1),higher diffusion coefficient of Li+and excellent cycling stability(200 cycles)over the pure WO3−x device.Meanwhile,numerical stimulation theoretically explores the mechanism and kinetics of the lithium ion diffusion,and proves the spatial and time distributions of higher Li+concentration in MXene/WO3−x composite electrochromic layer.Both experiments and theoretical data reveal that the addition of MXene is effective to promote the transport kinetics of ions and electrons simultaneously and thus realizing a high-performance electrochromic device.This work opens new avenues for electrochromic materials design and deepens the study of kinetics mechanism of ion diffusion in electrochromic devices. | Wenting Wu Huajing Fang Hailong Ma Liangliang Wu Wenqing Zhang Hong Wang | 2021 | Nano-Micro Letters2021，13，1： | 2 |
| 17 | Strain-regulated sensing properties of α-Fe_(2)O_(3) nano-cylinders with atomic carbon layers for ethanol detection显示文摘The sensitivity of ethanol sensor is of paramount importance in a variety of areas,including chemical production with ethanol,alcohol testing for driving safety,etc.Herein,α-Fe_(2)O_(3) nano-cylinders with atomic carbon layers are synthesized,for the first time,through in-situ catalytic chemical vapor deposition combined with hydrothermal techniques for the detection of ethanol.The reported α-Fe_(2)O_(3)@C nano-cylinders with double surficial strain effects deliver an ethanol detection sensitivity of 8 times as compared with α-Fe_(2)O_(3) nano-cylinders,10 times higher as compared with its detection sensitivity to ammonia,para-xylene,methanol and benzene.The sensor also exhibits over-14-day operation stability and the minimum detection limit of 10 ppm.To our best knowledge,the performances surpass those of previously reported α-Fe_(2)O_(3).Such attractive performances are attributed to the enhanced charge transfer in α-Fe_(2)O_(3) owing to the double surficial strain effects of α-Fe_(2)O_(3)@C nano-cylinders and the efficient adsorption of ethanol with atomic carbon layers. | Huajing Xiong Jianan Fu Jinyao Li Rashad Ali Hong Wang Yifan Liu Hua Su Yuanxun Li Woon-Ming Lau Nasir Mahmood Chunhong Mu Xian Jian | 2021 | Journal of Materials Science & Technology2021，，9： | 2 |
| 18 | Modeling and Stability Analysis for Non-linear Network Control System Based on T-S Fuzzy Model显示文摘Based on the T-S fuzzy model,this paper presents a new model of non-linear network control system with stochastic transfer delay.Sufficient criterion is proposed to guarantee globally asymptotically stability of this two-levels T-S fuzzy model.Also a T-S fuzzy observer of NCS is designed base on this two-levels T-S fuzzy model.All these results present a new approach for networked control system analysis and design. | ZHANG Hong FANG Huajing | 2007 | 现代电子技术2007，30，5： | 2 |
| 19 | Robust reliable guaranteed cost control for nonlinear singular stochastic systems with time delay显示文摘To study the design problem of robust reliable guaranteed cost controller for nonlinear singular stochas-tic systems,the Takagi-Sugeno (T-S) fuzzy model is used to represent a nonlinear singular stochastic system with norm-bounded parameter uncertainties and time delay.Based on the linear matrix inequality (LMI) techniques and stability theory of stochastic differential equations,a stochastic Lyapunov function method is adopted to design a state feedback fuzzy controller.The resulting closed-loop fuzzy system is robustly reliable stochastically stable,and the corresponding quadratic cost function is guaranteed to be no more than a certain upper bound for all admissible uncertainties,as well as different actuator fault cases.A suffcient condition of existence and design method of robust reliable guaranteed cost controller is presented.Finally,a numerical simulation is given to illustrate the effectiveness of the proposed method. | Zhang Aiqing Fang Huajing | 2008 | Journal of Systems Engineering and Electronics2008，19，4： | 2 |
| 20 | Development of a key-variable-based parallel HVAC energy predictive model显示文摘Building heating,ventilation,and air conditioning(HVAC)systems consume large amounts of energy,and precise energy prediction is necessary for developing various energy-efficiency strategies.Energy prediction using data-driven models has received increasing attention in recent years.Typically,two types of driven models are used for building energy prediction:sequential and parallel predictive models.The latter uses the historical energy of the target building as training data to predict future energy consumption.However,for newly built buildings or buildings without historical data records,the energy can be estimated using the parallel model,which employs the energy data of similar buildings as training data.The second predictive model is seldom studied because the model input feature is difficult to identify and collect.Herein,we propose a novel key-variable-based parallel HVAC energy predictive model.This model has informative input features(including meteorological data,occupancy activity,and key variables representing building and system characteristics)and a simple architecture.A general key-variable screening toolkit which was more versatile and flexible than present parametric analysis tools was developed to facilitate the selection of key variables for the parallel HVAC energy predictive model.A case study is conducted to screen the key variables of hotel buildings in eastern China,based on which a parallel chiller energy predictive model is trained and tested.The average cross-test error measured in terms of the coefficient of variation of the root mean square error(CV-RMSE)and normalized mean bias error(NMBE)of the parallel chiller energy predictive model is approximately 16%and 8.3%,which is acceptable for energy prediction without using historical energy data of the target building. | Huajing Sha Peng Xu Chengchu Yan Ying Ji Kenan Zhou Feiran Chen | 2022 | Building Simulation2022，15，7： | 1 |
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