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A new DFB-fiber laser hydrophone 被引量:4
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作者 WANGJin-yu SUIQing-mei +3 位作者 CHANGJun LIU Tong-yu MA Liang-zhu NI Jia-sheng 《Optoelectronics Letters》 EI 2007年第4期264-266,共3页
A new fiber optic hydrophone is described. based on a distributed feedback fiber laser (DFB-fiber laser) Experimental arrangement consists of DFB-FL, unbalanced Mach-Zehnder interferometer, piezoelectric (PZT) modulat... A new fiber optic hydrophone is described. based on a distributed feedback fiber laser (DFB-fiber laser) Experimental arrangement consists of DFB-FL, unbalanced Mach-Zehnder interferometer, piezoelectric (PZT) modulator, detection and feedback control circuit, and oscillograph. Experimental results show that the bare DFB-FL hydrophone is extremely sensitive to small perturbations in their environment and can acquire exact acoustic signals. 展开更多
关键词 水诊器 激光技术 光学纤维 分布式反馈
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Pick sequencing optimization problem in the rotary rack S/R system
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作者 PanZHANG LeiJIA GuohuiTIAN 《控制理论与应用(英文版)》 EI 2004年第3期229-238,共10页
The problem of pick sequencing in the rotary rack S/R system (PPS-RRS) is investigated with the objective of minimizing the execution time. The rotary rack S/R system consists of one S/R machine and multiple levels of... The problem of pick sequencing in the rotary rack S/R system (PPS-RRS) is investigated with the objective of minimizing the execution time. The rotary rack S/R system consists of one S/R machine and multiple levels of carousels that can rotate independently in bi-directions. The routing policy, namely the decision on the storage or retrieval sequence, dominates the efficiency and the throughput for such S/R systems, due to the complicated relationship between all levels of carousels and the S/R machine. For the purpose of optimizing the PPS-RRS, a computational model is developed in terms of execution time for picking multiple items in one trip. Characteristics of the PPS-RRS are analyzed and a local search heuristic based on a newly proposed neighborhood is presented. Integrated with the proposed local search procedure a new hybrid genetic algorithm is developed. Experimental results demonstrate the structure characteristics of good sequence and the efficiency and effectiveness of the proposed sequencing algorithms. 展开更多
关键词 Rotary rack S/R system Hybrid genetic algorithm Sequencing problem Level-blank neighborhood Local search
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H_∞ control for stochastic systems with time-delay
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作者 LiuYungang FangRui ZhangYun LiYanfang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第2期356-362,共7页
The H∞-control problem of stochastic systems with time-delay is considered. The sufficient conditions are obtained, under which there are always state-feedback control and dynamic output-feedback control so that the ... The H∞-control problem of stochastic systems with time-delay is considered. The sufficient conditions are obtained, under which there are always state-feedback control and dynamic output-feedback control so that the resulting closed-loop system is internaly stable and L2 input-output stable in the sense of expectation. Furthermore, the explicit formulas of both kinds of controls are derived. An example is included to illustrate the correctness of theoretic results. 展开更多
关键词 stochastic time-delay systems H∞-control differential game linear matrix inequality.
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Intelligent vehicle lateral controller design based on genetic algorithmand T-S fuzzy-neural network
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作者 RuanJiuhong FuMengyin LiYibin 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2005年第2期382-387,共6页
Non-linearity and parameter time-variety are inherent properties of lateral motions of a vehicle. How to effectively control intelligent vehicle (IV) lateral motions is a challenging task. Controller design can be reg... Non-linearity and parameter time-variety are inherent properties of lateral motions of a vehicle. How to effectively control intelligent vehicle (IV) lateral motions is a challenging task. Controller design can be regarded as a process of searching optimal structure from controller structure space and searching optimal parameters from parameter space. Based on this view, an intelligent vehicle lateral motions controller was designed. The controller structure was constructed by T-S fuzzy-neural network (FNN). Its parameters were searched and selected with genetic algorithm (GA). The simulation results indicate that the controller designed has strong robustness, high precision and good ride quality, and it can effectively resolve IV lateral motion non-linearity and time-variant parameters problem. 展开更多
关键词 intelligent vehicle genetic algorithm fuzzy-neural network lateral control robustness.
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Minimal-order observer and output-feedback stabilization control design of stochastic nonlinear systems 被引量:8
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作者 LIUYungang ZHANGJifeng 《Science in China(Series F)》 2004年第4期527-544,共18页
A minimal-order observer and output-feedback stabilization control are given for single-input multi-output stochastic nonlinear systems with unobservable states, un- modelled dynamics and stochastic disturbances. Base... A minimal-order observer and output-feedback stabilization control are given for single-input multi-output stochastic nonlinear systems with unobservable states, un- modelled dynamics and stochastic disturbances. Based on the observer designed, the estimates of all observable states of the system are given, and the convergence of the es- timation errors are analyzed. In addition, by using the integrator backstepping approach, an output-feedback stabilization control is constructively designed, and sufficient condi- tions are obtained under which the closed-loop system is asymptotically stable in the large or bounded in probability, respectively. 展开更多
关键词 nonlinear systems minimal-order integrator backstepping approach stabilization control.
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Observer and observer-based H_(∞)control of generalized Hamiltonian systems 被引量:3
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作者 WANGYuzhen GES.S. CHENGDaizhan 《Science in China(Series F)》 2005年第2期211-224,共14页
This paper deals with observer design for generalized Hamiltonian systems and its applications. First, by using the systems' structural properties, a new observer design method called Augment Plus Feedback is prov... This paper deals with observer design for generalized Hamiltonian systems and its applications. First, by using the systems' structural properties, a new observer design method called Augment Plus Feedback is provided and two kinds of observers are obtained: non-adaptive and adaptive ones. Then, based on the obtained observer, H∞ control design is investigated for generalized Hamiltonian systems, and an observer-based control design is proposed. Finally, as an application to power systems, an observer and an observer-based H∞ control law are designed for single-machine infinite-bus systems. Simulations show that both the observer and controller obtained in this paper work very well. 展开更多
关键词 generalized Hamiltonian system adaptive observer zero-state detectable observer-based H∞ control power system.
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