检索结果-南通市图书馆

hybrid control of Delay Induced Hopf Bifurcation of Dynamical Small-World Network

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2017年第2期22卷 206-215页

作者：丁大为张肖芸王年梁栋 Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Electronics and Information Engineering Anhui University

In this paper, we focus on the Hopf bifurcation control of a small-world network model with time-delay. With emphasis on the relationship between the Hopf bifurcation and the time-delay, we investigate the effect of time-delay by choosing it as the bifurcation parameter. By using tools from control and bifurcation theory, it is proved that there exists a critical value of time-delay for the stability of the model. When the time-delay passes through the critical value, the model loses its stability and a Hopf bifurcation occurs. To enhance the stability of the model, we propose an improved hybrid control strategy in which state feedback and parameter perturbation are used. Through linear stability analysis, we show that by adjusting the control parameter properly, the onset of Hopf bifurcation of the controlled model can be delayed or eliminated without changing the equilibrium point of the model. Finally, numerical simulations are given to verify the theoretical analysis. © 2017, Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg.

关键词： Hopf bifurcation hybrid control small-world network bifurcation control

Observer-based hybrid control algorithm for semi-active suspension systems

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第9期23卷 2268-2275页

作者： REN Hong-bin CHEN Si-zhong ZHAO Yu-zhuang LIU Gang YANG Lin School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China College of Mechanical ＆ Electrical Engineering Shenyang Aerospace University Shenyang 110136 China

In order to improve ride comfort and handling performance of the vehicle, an adaptive hybrid control algorithm is proposed for semi-active suspension systems. The virtues of sky-hook is combined with ground-hook control strategies and a more suitable compromise for the suspension systems is chosen. The hybrid coefficient is tuned according to the longitudinal and lateral acceleration so as to improve the vehicle stability especially in high speed conditions. Damping continuous adjustable absorber is used to continuously control the damping force so as to eliminate the damping force jerk instead of traditional on-off control policy. Based on suspension stroke measured by sensors, unscented Kalman filter is designed to estimate the suspension states in real-time for the realization of hybrid control, which improves the robustness of the control strategy and is adaptive to different types of road profiles. Finally, the proposed control algorithm is validated under the following two typical road profiles: half-sine speed bump road and the random road. The simulation results indicate that the hybrid control algorithm could offer a good coordination between ride comfort and handling of the vehicle.

关键词： semi-active suspension hybrid control unscented Kalman filter (UKF)

Improvement of uniformity in cultivation environment and crop growth rate by hybrid control of air flow devices

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2015年第12期22卷 4702-4708页

作者： BAEK Min-Seon KWON Sook-Youn LIM Jae-Hyun Department of Computer Science and Engineering Kongju National University Green Energy Technology Research Center Kongju National University

A complete control type plant factory has high efficiency in terms of cultivation area by constructing vertical multiple layered cultivation ***,it has a problem of irregular crop growth due to temperature deviation at upper and lower beds and increases in energy consumption by a prolonged cultivation *** this work,air flow rate inside a facility was improved by a hybrid control of air flow devices like air conditioning and air circulation fan with an established wireless sensor network to minimize temperature deviations between upper and lower beds and to promote crop *** performance of proposed system was verified with an experimental environment or Case A wherein air conditioning device was operated without a control algorithm and Case B wherein air conditioning and circulation fans were alternatively operated based on the hybrid control *** planting leafy vegetables under each experimental condition,crops were cultivated for 21 *** a result,Case B wherein AC(air conditioning) and ACF(air-circulation fan) were alternatively operated based on the hybrid control algorithm showed that fresh mass,number of leaves,and leaf length for the crops grown were increased by 40.6%,41.1%,and 11.1%,respectively,compared to Case A.

关键词： air flow devices hybrid control cultivation environment uniformity growth rate

Adaptive neural dynamic-based hybrid control strategy for stable retrieval of tethered satellite systems

在线全文

学校读者我要写书评

暂无评论

Astrodynamics 2024年第2期8卷 261-269页

作者： Zhixiong Ji Gefei Shi School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China Shenzhen Campus of Sun Yat-sen University Shenzhen 518107China Shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China

This study proposes a novel adaptive neural dynamic-based hybrid control strategy for stable subsatellite retrieval of two-body tethered satellite *** retrieval speed is given analytically,ensuring a libration-free steady *** mitigate the potential libration motion,a general control input signal is generated by an adaptive neural-dynamic(AND)algorithm and executed by adjusting the retrieval speed and thruster on the *** address the limited retrieval speed and improve the control performance,the thruster controller is manipulated according to a novel advanced state fuzzy control law based on higher-order libration states,whereas the remaining control input is allocated to the speed *** Lyapunov stability of the control strategy is demonstrated *** simulations validate the proposed control strategy,demonstrating well-allocated control inputs for both controllers and good control performance.

关键词： tethered satellite system(TSS) stable retrieval hybrid control adaptive neural-dynamic (AND)control fuzzy control

Test and numerical simulation of a new type of hybrid control technique

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2005年第2期4卷 305-310页

作者：孟庆利张敏政陈栋 Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China AssociateProfessor Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Professor Postgraduate

In this paper, a new hybrid control technique, based on a combination of base-isolation and semi-active variable stiffness/damping in a superstructure, is presented. To illustrate the efficiency of the proposed control system, model tests on a mini-electromagnetic shaking table and a numerical simulation were performed. The test and numerical calculation results indicate that this new hybrid control mode with additional damping and smaller additional stiffness can achieve a better control efficiency.

关键词： base-isolation semi-active variable stiffness/damping control hybrid control shaking table model test

MIMO hybrid control of Structural Responses for Helicopter

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2003年第3期16卷 151-156页

作者：雷凌云顾仲权鲁民月 National Key Laboratory of Rotorcraft and Aeromechanics

A MIMO hybrid model of structural response control, which combines adaptivefeedfor-ward control and feedback control, was developed and then applied in a helicopter model toeliminate the dual-frequency harmonious vibration at cabin seats. In implementation, an AOEF(Acceleration Output Extended Feedback) controller for the MIMO case was designed to add enoughdamping to the control path so that the convergence rate of the FXLMS algorithm could be obviouslyimproved. The corresponding FXLMS algorithm for the control path of closed loop was developed *** numerical results on the finite element model of a helicopter indicated that with hybridcontrol, responses at four rows of seats could be controlled with two actuators and the adaptivecontrollers got a quicker convergence rate.

关键词： hybrid control adaptive feedforward feedback MIMO FXLMS

hybrid control of a prototypical nonholonomic system

在线全文

学校读者我要写书评

暂无评论

Hybrid Control of a prototypical nonholonomic system

hybrid control FOR SWITCHING BETWEEN POSITION AND FORCE TRACKING

第二十三届中国控制会议

作者： Xiao-Song Yang , Quan Yuan Department of Mathematics, Huazhong University of Science and Technology,Wuhan, 430074, China Institute for Nonlinear Systems, Chongqing University of Posts and Telecomm.Chongqing 400065, China

＜正＞ In this paper we present a simple hybrid control for stabilization of a prototypical nonholonomic system, the computer simulation is provided to verify the efficiency of this hybrid control.

关键词： hybrid control nonholonomic system.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

HYBRID CONTROL FOR SWITCHING BETWEEN POSITION AND FORCE TRAC...

hybrid control of Interconnected Diesel-generators for Marine Power Station

第四届流体传动国际会议

作者： Xavier Brun Daniel Thomasset Serge Scavarda Laboratoire d’Automatique Industrielle INSA de Lyon Btiment Antoine de Saint Exupéry 25 Avenue Jean Capelle 69621 Villeurbanne Cedex FRANCE

This paper is the logical result of previous researches about advanced control in electropneumatic systems. After different works in feedback control of electropneumatic actuators in position tracking [1] or in force tracking [2], this study led about a method to switch between these two different focuses. This question is an important problem in many industrial systems, for example in the case of vehicle active suspension or for pneumatic or hydraulic pliers, fingers and spot welding, fatigue test. Indeed, some dangerous damages could occur when the aim is to move a load near a structure and to apply a force against this structure. The major difficulty is to know when and how to switch between the position control and the force control (this is here the notion of hybrid control). A classical occurrence is due to a static position error when the control algorithm switches from position feedback to force feedback. The result leads very often to an undesirable impact to the structure.

关键词： force/position tracking hybrid control pneumatic

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Hybrid Control of Interconnected Diesel-generators for Marin...