Time-delay mismatch and the performance of predictor control schemes

1983 ◽  
Vol 38 (2) ◽  
pp. 433-447 ◽  
Author(s):  
R. D. HOCKEN ◽  
S. V. SALEHI ◽  
J. E. MARSHALL
Keyword(s):  
Time Delay ◽  
Control Schemes

scholarly journals Synchronization Control of Time-Varying Complex Dynamic Network with Nonidentical Nodes and Coupling Time-Delay

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Youjian Zhang ◽  
Wenjun Yan ◽  
Qiang Yang
Keyword(s):  
Time Delay ◽  
Feedback Control ◽  
Complex Networks ◽  
Hybrid Control ◽  
Dynamic Network ◽  
Time Varying ◽  
Static Feedback ◽  
Control Schemes ◽  
Coupling Time ◽  
Nonidentical Nodes

This paper addresses the synchronization problem for a class of complex networks with time-varying topology as well as nonidentical nodes and coupling time-delay and presents two efficient control schemes to synchronize the network onto any given smooth goal dynamics. The time-varying network is supposed to be bounded within a certain range, which cannot be controlled. Through the adoption of hybrid control with linear static feedback control and adaptive feedback control, two control schemes are derived to guarantee such complex networks to reach the global synchronization. Finally, a set of numerical simulation experiments are carried out and the results demonstrate the effectiveness of the suggested control solutions.

Multioperator Teleoperation of Multirobot Systems with Time Delay: Part I—Aids for Collision-Free Control

2002 ◽  
Vol 11 (3) ◽  
pp. 277-291 ◽  
Author(s):  
Nak Young Chong ◽  
Shun'ichi Kawabata ◽  
Kohtaro Ohba ◽  
Tetsuo Kotoku ◽  
Kiyoshi Komoriya ◽  
...  
Keyword(s):  
Time Delay ◽  
Coordinated Control ◽  
Difficult Problem ◽  
Multirobot Systems ◽  
Test Bed ◽  
Control Schemes ◽  
Plant Maintenance ◽  
Single Operator ◽  
Teleoperation Systems ◽  
Delayed Visual Feedback

In this paper, various coordinated control schemes are explored in Multioperatormultirobot (MOMR) teleoperation through a communication network with time delay. Over the past decades, problems and several notable results have been reported mainly in the Single-Operator–Single-Robot (SOSR) teleoperation system. Recently, the need for cooperation has rapidly emerged in many possible applications such as plant maintenance, construction, and surgery, because multirobot cooperation would have a significant advantage over a single robot in such cases. Thus, there is a growing interest in the control of multirobot systems in remote teleoperation, too. However, the time delay over the network would pose a more difficult problem to MOMR teleoperation systems and seriously affect their performance. In this work, our recent efforts devoted to the coordinated control of the MOMR teleoperation is described. First, we build a virtual experimental test bed to investigate the cooperation between two telerobots in remote environments. Then, different coordinated control aids are proposed to cope with collisions arising from delayed visual feedback from the remote location. To verify the validity of the proposed schemes, we perform extensive simulations of various planar rearrangement tasks employing local and remote graphics simulators over an ethernet LAN subject to a simulated communication delay.

scholarly journals Hopf Bifurcation Control in a FAST TCP and RED Model via Multiple Control Schemes

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Dawei Ding ◽  
Chun Wang ◽  
Lianghui Ding ◽  
Nian Wang ◽  
Dong Liang
Keyword(s):  
Hopf Bifurcation ◽  
Time Delay ◽  
Feedback Control ◽  
Congestion Control ◽  
State Feedback ◽  
Feedback Controller ◽  
Bifurcation Control ◽  
Fast Tcp ◽  
Hybrid Controller ◽  
Control Schemes

We focus on the Hopf bifurcation control problem of a FAST TCP model with RED gateway. The system gain parameter is chosen as the bifurcation parameter, and the stable region and stability condition of the congestion control model are given by use of the linear stability analysis. When the system gain passes through a critical value, the system loses the stability and Hopf bifurcation occurs. Considering the negative influence caused by Hopf bifurcation, we apply state feedback controller, hybrid controller, and time-delay feedback controller to postpone the onset of undesirable Hopf bifurcation. Numerical simulations show that the hybrid controller is the most sensitive method to delay the Hopf bifurcation with identical parameter conditions. However, nonlinear state feedback control and time-delay feedback control schemes have larger control parameter range in the Internet congestion control system with FAST TCP and RED gateway. Therefore, we can choose proper control method based on practical situation including unknown conditions or parameter requirements. This paper plays an important role in setting guiding system parameters for controlling the FAST TCP and RED model.

A Comparison of Control Schemes for Teleoperation with Time Delay

2001 ◽  
Vol 34 (9) ◽  
pp. 1-6 ◽  
Author(s):  
Paolo Arcara ◽  
Claudio Melchiorri
Keyword(s):  
Time Delay ◽  
Control Schemes
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