Event-triggered synchronization of delayed neural networks with actuator saturation using quantized measurements     

Liuwen Li  Wenlin Zou  Shumin Fei 《Journal of The Franklin Institute》2019,356(12):6433-6459

This paper studies event-triggered synchronization control problem for delayed neural networks with quantization and actuator saturation. Firstly, in order to reduce the load of network meanwhile retain required performance of system, the event-triggered scheme is adopted to determine if the sampled signal will be transmitted to the quantizer. Secondly, a synchronization error model is constructed to describe the master-slave synchronization system with event-triggered scheme, quantization and input saturation in a unified framework. Thirdly, on the basis of Lyapunov–Krasovskii functional, sufficient conditions for stabilization are derived which can ensure synchronization of the master system and slave system; particularly, a co-designed parameters of controller and the corresponding event-triggered parameters are obtained under the above stability condition. Lastly, two numerical examples are employed to illustrate the effectiveness of the proposed approach.  相似文献   

An improved design strategy for approximation-based adaptive event-triggered tracking of a class of uncertain nonlinear systems     

Yun Ho Choi  Sung Jin Yoo 《Journal of The Franklin Institute》2019,356(8):4378-4396

This paper presents an improved adaptive design strategy for neural-network-based event-triggered tracking of uncertain strict-feedback nonlinear systems. An adaptive tracking scheme based on state variables transmitted from the sensor-to-controller channel is designed via only single neural network function approximator, regardless of unknown nonlinearities unmatched in the control input. Contrary to the existing multiple-function-approximators-based event-triggered backstepping control results with multiple triggering conditions dependent on all error surfaces, the proposed scheme only requires one triggering condition using a tracking error and thus can overcome the problem of the existing results that all virtual controllers with multiple function approximators should be computed in the sensor part. This leads to achieve the structural simplicity of the proposed event-triggered tracker in the presence of unmatched and unknown nonlinearities. Using the impulsive system approach and the error transformation technique, it is shown that all the signals of the closed-loop system are bounded and the tracking error is bounded within pre-designable time-varying bounds in the Lyapunov sense.  相似文献   

New results on the trade-off performance of LTI system with colored noise and encoder-decoder strategy     

Baoxian Wang  Yanli Lv  Jigui Jian  Xiaowei Jiang 《Journal of The Franklin Institute》2019,356(16):8971-8995

This paper studies the trade-off performance between tracking performance and control input energy of the multi-input multi-output(MIMO), linear and time-invariant(LTI) system over an additive coloured Gaussian noise(ACGN) channel and the encoder-decoder strategies. The restriction that filter in the encoder-decoder strategy must be diagonal matrix is not necessary. And some new results are derived according to the inner-outer factorization. The results show that the trade-off performance is correlated to the unstable pole, non-minimum phase zero of the system. Also new poles and zeros generated by the non-diagonal encoder-decoder strategies may affect the trade-off performance. At last, two examples with different filters and different encoder-decoder strategies are discussed to validate the conclusions. The various encoder-decoder strategies revealed by the simulations may enhance or deteriorate the trade-off performance proposed in this paper.  相似文献   

Sampled-data control for continuous-time Markovian jump linear systems via a fragmented-delay state and its state-space model     

JunMin Park  PooGyeon Park 《Journal of The Franklin Institute》2019,356(10):5073-5086

This paper considers a stability analysis problem for continuous-time Markovian jump linear systems under aperiodic samplings which are represented as Markovian jump linear systems with input delay. For the systems, this paper constructs a Lyapunov functional by utilizing a fragmented-delay state, which is defined between the last sampling instant and the present time, and a new state space model of the fragmented state. Based on the Lyapunov functional, a stability criterion is derived in terms of linear matrix inequalities by using reciprocally convex approach and integral inequality. Here, the reciprocally convex approach and integral inequality are associated not only with the current state, the delayed state, and the maximum-admissible delay state, but also with the fragmented-delay state. The simulation result shows the effectiveness of the proposed stability criterion.  相似文献   

科技学术期刊作者贡献声明著录现状分析_^*     

徐文华  王景周 《科技管理研究》2019,(12)

学术论文的各种署名失范行为严重影响文献计量和学术评价的客观性和公正性,作者贡献声明对规范作者署名具有重要的约束作用。首先,以中国科学引文数据库(CSCD)2017—2018版来源期刊为研究对象,考察我国科技学术期刊的作者贡献声明著录现状,发现：1229种期刊中仅有2.6%(32/1028)的期刊注有作者贡献声明,其中中文语种期刊0.19%(2/1028),英文语种期刊14.93%(30/201)。其次,分析作者贡献声明在我国科技学术期刊中没有得到普及的原因及著录中存在的问题。最后,提出一些建议和措施,为规范作者署名、真实体现作者贡献、推动科技合作和学术评价提供参考。  相似文献   

Fault-tolerant control for commercial aircraft with actuator faults and constraints     

Yishi Liu  Xiwang Dong  Zhang Ren  Jonathan Cooper 《Journal of The Franklin Institute》2019,356(7):3849-3868

In this paper, a constrained control scheme based on model reference adaptive control is investigated for the longitudinal motion of a commercial aircraft with actuator faults and saturation nonlinearities. Actuator faults and constraints are both important factors adversely affecting the stability and performance of flight control systems. An adaptive adjustment law based on Lyapunov function is utilized to adjust the fault-tolerant control law. Both additive and multiplicative faults are considered in the designed controller to deal with the three types of actuator faults: locked in place, loss of effectiveness, and bias. Moreover, different techniques are implemented in the basic and fault-tolerant controller to anti-windup. Proofs for the stability of the two modified controllers which improve the performance of control system operating in the presence of actuator faults and saturations are proposed. Finally, a numerical example of the anti-windup fault-tolerant controller for a commercial aircraft is demonstrated. The stability and performance improvements can be accrued with the presented fault-tolerant control scheme.  相似文献   

Necessary conditions of exponential stability for a class of linear uncertain systems with a single constant delay     

Xian Zhang  Xinxiao Liu  Yantao Wang  Xin Wang 《Journal of The Franklin Institute》2019,356(7):4043-4060

In this paper, we will investigate the necessary conditions, described by the Lyapunov matrix, for the robust exponential stability for a class of linear uncertain systems with a single constant delay and time-invariant parametric uncertainties, which are some generalizations of the existing results on uncertain linear time-delay systems. As a medium step, several pivotal properties of parameter-dependent Lyapunov matrix are proposed, which set up the relationships between fundamental matrix and Lyapunov matrix for the considered system. In addition, to calculate the parameter-dependent Lyapunov matrix, we introduce the differential equation method and the Lagrange interpolation method, respectively. Furthermore, it is noted that the proposed necessary conditions can be used to estimate the range of time delay, when the linear uncertain time-delay system is robust exponential stability. Finally, the validity of the obtained theoretical results is illustrated via numerical examples.  相似文献   

Output feedback robust H∞ control for spacecraft rendezvous system subject to input saturation: A gain scheduled approach     

Yi Huang  Yingmin Jia 《Journal of The Franklin Institute》2019,356(7):3899-3921

In this paper, the problem of output feedback robust H_∞ control for spacecraft rendezvous system with parameter uncertainties, disturbances and input saturation is investigated. Firstly, a full-order state observer is designed to reconstruct the full state information, whose gain matrix can be obtained by solving the linear matrix inequality (LMI). Subsequently, by combining the parametric Riccati equation approach and gain scheduled technique, an observer-based robust output feedback gain scheduled control scheme is proposed, which can make full use of the limited control capacity and improve the control performance by scheduling the control gain parameter increasingly. Rigorous stability analyses are shown that the designed discrete gain scheduled controller has faster convergence performance and better robustness than static gain controller. Finally, the performance and advantage of the proposed gain scheduled control scheme are demonstrated by numerical simulation.  相似文献   

Robust bounds for fractional-order systems with uncertain order and structured perturbations via Cylindrical Algebraic Decomposition method     

Jing Yang  Xiaorong Hou 《Journal of The Franklin Institute》2019,356(7):4097-4105

This paper considers the robust stability problem of fractional-order systems with uncertain order and structured perturbations. A stability check procedure is proposed for determining the robust bounds of uncertain order and other uncertain parameters for fractional-order systems.The results are obtained in terms of Cylindrical Algebraic Decomposition which is first used for analyzing the robust stability problem of fractional-order systems with uncertain order. The method is non-conservative for fractional-order systems with the uncertain order α satisfying 0?<?α?<?2. Examples are given to demonstrate the effectiveness of proposed approach.  相似文献   

Erratum to “Analysis and Experimental Investigation into a Finite Time Current Observer Based Adaptive Backstepping Control of Buck Converters”     

Tousif Khan Nizami  Arghya Chakravarty  Chitralekha Mahanta 《Journal of The Franklin Institute》2019,356(7):4190

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