Robust H∞ Model Reference Tracking Control for Networked Control Systems with Communication Constraints

Yu-Long Wang,Guang-Hong Yang 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.6

This paper studies the problem of H∞ model reference tracking control for continuous time networked control systems (NCSs) with communication constraints. By using the continuous Jensen inequality, linear matrix inequality (LMI)-based H∞ model reference tracking controller design for nominal NCSs with controller-to-actuator communication constraints is presented, and a new method is proposed to design H∞ model reference tracking controllers for NCSs with both controller-to-actuator and sensor-to- controller communication constraints. The results are also extended to NCSs with norm-bounded parameter uncertainties. The merits of the proposed methods lie in their less computational complexity and less conservatism, which are achieved by adopting continuous Jensen inequality and proposing new controller design methods, respectively. The simulation results illustrate the effectiveness of the proposed H∞ model reference tracking controller design for NCSs with communication constraints.

Stabilization of the Networked Hybrid Systems with Communication Constraints and Its Applications

Yan He,Sida Lin,Jun Sun 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

In this paper, a stabilization problem is investigated for a class of networked control systems with some communication constraints. A class of networked hybrid control systems are first established using the hybrid system approach, in which logarithmic quantization, scheduling protocols and synchronously varying transmission intervals are considered. Then, by designing an appropriate controller and a corresponding Lyapunov function, a sufficient condition is presented to ensure the stabilization of the established systems. The sufficient condition estimates the bounds of the maximally allowable transmission interval and the coarsest quantization density. Moreover, the obtained results are applied to the DC motor system. Finally, numerical simulations are given to illustrate the effectiveness of the proposed method.

Variance-constrained Distributed H∞ Filtering for Nonlinear Systems with Successive Packet Dropouts Over Wireless Sensor Networks

Huifang Kang,Dongyan Chen,Jun Hu,Long Xu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3

In this paper, the distributed H∞ filtering problem is investigated for a class of nonlinear systems over wireless sensor networks (WSNs) with successive packet dropouts (SPDs) and multiplicative noise under an eventtriggered communication mechanism (ETCM). A series of uncorrelated random variables which obey the Bernoulli distribution are used to characterize the induced phenomenon of SPDs occurring in network communication. The ETCM based on the relative error between the estimated signals is introduced to reduce the burden of communication and achieve the purpose of saving network resources. The measurement information on each sensor node can be transmitted to its neighboring nodes only when the certain triggering condition is satisfied. In view of WSNs, a distributed filtering error system model is firstly built to take SPDs together with multiplicative noise into account. Then, sufficient conditions are established to ensure both the prescribed H∞ performance requirement and the filtering error variance constraint over a finite-horizon. Moreover, the design method of filter parameters is given in terms of matrix inequalities. Finally, a numerical example is presented to verify the effectiveness and feasibility of the proposed distributed H∞ filters design scheme.

Broadening of Foci in an Ocean Time Reversal Processing and Application to Underwater Acoustic Communicaion

Shin, Kee-Cheol,Kim, Jea-Soo The Acoustical Society of Korea 2008 韓國音響學會誌 Vol.27 No.e3

Recently, a method for robust time reversal focusing has been introduced to extend the period of stable focusing in time-dependent ocean environments [S. Kim et al., J. Acoust. Soc. Am. 114, 145-157, (2003)]. In this study, concept of focal-size broadening based on waveguide invariant theory in an ocean time reversal acoustics is described. It is achieved by imposing the multiple location constraints. The signal vector used in multiple location constraints are found from the theory on waveguide invariant for frequency band corresponding the extended focal range. The broadening of foci in an ocean waveguide can play an important role in the application of time reversal processing, particularly to the underwater acoustic communication with moving vehicles. The proposed method is demonstrated in the context of the underwater acoustic communication from the transmit/receive array (TRA) to a slowly moving vehicle.

A General Framework for the Optimization of Energy Harvesting Communication Systems with Battery Imperfections

Devillers, Bertrand,Gunduz, Deniz The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.2

Energy harvesting has emerged as a powerful technology for complementing current battery-powered communication systems in order to extend their lifetime. In this paper a general framework is introduced for the optimization of communication systems in which the transmitter is able to harvest energy from its environment. Assuming that the energy arrival process is known non-causally at the transmitter, the structure of the optimal transmission scheme, which maximizes the amount of transmitted data by a given deadline, is identified. Our framework includes models with continuous energy arrival as well as battery constraints. A battery that suffers from energy leakage is studied further, and the optimal transmission scheme is characterized for a constant leakage rate.

A General Framework for the Optimization of Energy Harvesting Communication Systems with Battery Imperfections

Bertrand Devillers,Deniz Gündüz 한국통신학회 2012 Journal of communications and networks Vol.14 No.2

Energy harvesting has emerged as a powerful technology for complementing current battery-powered communication systems in order to extend their lifetime. In this paper a general framework is introduced for the optimization of communication systems in which the transmitter is able to harvest energy from its environment. Assuming that the energy arrival process is known non-causally at the transmitter, the structure of the optimal transmission scheme, which maximizes the amount of transmitted data by a given deadline, is identified. Our framework includes models with continuous energy arrival as well as battery constraints. A battery that suffers from energy leakage is studied further, and the optimal transmission scheme is characterized for a constant leakage rate.

Stochastic Consensus for Heterogeneous Multi-agent Networks With Constraints and Communication Noises

Haokun Hu,Lipo Mo,Fei Long 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.4

The mean-square consensus of the discrete-time heterogeneous multi-agent systems (HMASs) with convex position constraints, nonconvex velocity constraints and communication noises is reported in this paper, where the dynamics of HMASs are composed of first-order or second-order difference equations, and the noises are assumed to be martingale difference sequences. Firstly, a new algorithm is designed based on the information from neighbor agents with noises, and the original system is changed into an equivalent one by introducing a coordinate transformation. Secondly, when the communication graph is joint strongly connected, it is proved that mean-square consensus can be achieved by the properties of stochastic matrix, projection operator and martingale, and the position and velocity states of agents stay at the corresponding constraint sets. Specially, the situations of a network containing only first-order agents or second-order agents are considered, respectively. Finally, the correctness of the theoretical results is verified by numerical simulations.

Consensus Problem of Second-order Multi-agent Systems with Communication Channel Constraint on Signal Amplitude (ICCAS 2012)

Ming-Hui Wang,Kenko Uchida 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

This paper investigates the consensus problem of the second-order multi-agent systems with communication channel constraint on signal amplitude. Communication delays as one kind of channel constraints in the second-order multi-agent systems have been discussed in the recent literature while in this paper consensus problem of second-order multi-agent systems with communication channel constraint on signal amplitude is investigated. A state-dependent switching parameter is introduced into the consensus protocol. A sufficient condition is obtained for the consensus problem of the second-order multi-agent systems with communication channel constraint based on our early work. A simple example is also given to verify the effectiveness of the proposed theorem.

Output Tracking Predictive Control of Networked Systems with Two-channel Random Communication Constraints

Chuan-Dong Bai,Tong Mu,Zhong-Hua Pang,Jian Sun,Guo-Ping Liu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

In this paper, the output tracking control problem is investigated for a networked control system with twochannel random network delays and packet dropouts as well as stochastic noise. To actively compensate for these random communication constraints in the feedback and forward channels, a novel networked predictive control (NPC) method is proposed based on the input-output difference equation model, where the two-channel communication constraints are handled separately according to their different features. Furthermore, different from the existing NPC methods based on round-trip time delays, actual control inputs rather than the predicted ones are employed to generate future control commands. Then a delay-independent closed-loop stability condition is obtained, and a condition to guarantee a zero steady-state output tracking error is derived. Also, theoretical analysis shows that the proposed NPC method can achieve the same output tracking performance as the corresponding local control system. Finally, the effectiveness of the proposed method is evaluated by simulation and experimental results.

Hybrid Scheduling and Quantized Output Feedback Control for Networked Control Systems

Tengli Wang,Chuan Zhou,Hui Lu,Junda He,Jian Guo 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1

A novel co-design scheme of hybrid scheduling strategy, adaptive logarithmic quantizer and dynamic robust H-infinity output feedback controller for a class of networked control system (NCS)with communication constraints and time delay is proposed. The hybrid scheduling scheme integrates dead zone scheduling and Try Once Discard (TOD) scheduling so as to get the stronger adaptability and flexibility than the single scheduling. In this scheme, dead zone scheduling which updates the threshold according to mode-dependent control strategy is used for single node of NCS to reduce the network bandwidth utilization while TOD scheduling is used for the whole node of NCS in order to meet the requirements of communication constraints and guarantee the overall system performance.We develop the integrated design for the hybrid scheduling strategy, adaptive quantizer and dynamic robust output feedback controller to maintain asymptotic stability of the closed-loop NCS by using the multiple-Lyapunov function and switched system theory. The proposed method can improve the the quality of service (QoS) meanwhile ensure the quality of control (QoC) of overall systems, which make a better trade-off between network utilization and control performance. An simulation example demonstrates the efficiency of the proposed method.