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Leveling operation is a very important step in the installation process of offshore jacket platform and it is performed by leveling tool. In this paper, the hydraulic lifting subsystem model of leveling tool is established, and a modified Smith predictor is used to address the time delay problem caused by long pipeline. A composite control strategy combining identical and master slave control mode...
Dual-user teleoperation systems consisting of two master robots and one slave robot can be employed in order to facilitate the collaboration of two operators in a cooperative operation. Although, the stability as well as the performance of such systems suffers from undesired effects of latency, the significant issue of communication delay has been disregarded in the previous reported studies upon...
This paper is concerned with sliding mode control of offshore steel jacket platforms subject to nonlinear wave-induced forces. Two sliding mode control schemes are proposed to reduce the oscillation amplitudes of the platforms. One scheme is that a conventional sliding mode controller (SMC) is designed, under the SMC the oscillation amplitudes of the platform are effectively reduced; however, a very...
This paper proposes a model based controller design by exploiting μ-synthesis for a network based system with time varying delay and the plant model uncertainty. Much research has investigated network system with time delay and both frequency-domain based and time domain based approaches have been proposed. In this paper, we firstly review the study on conservativeness of existing approaches for time...
This paper presents the design, development and implementation of an automation system of batch process suitable for vulcanization accelerator production applications. The unique feature of the accelerator production process is that it has complex nonlinear, time-varying and large time-delay characteristics. Based on its kinetics characteristics and technical analysis of the batch process, adaptive...
This paper addresses the H∞ control problem for linear systems where sensors, controllers and plants are connected by a network medium. A novel control scheme is proposed to stabilize an unstable plant by employing a time-varying sampling period method. Furthermore, the method may also compensate packet dropout and network-induced delays. The simulation results illustrate the effectiveness of the...
The vehicle control system based on Network communication becomes increasingly complicated recently. The traditional research only focuses on the improvement of network communication quality or system control performance. The network configuration had been carried out to study the vehicle chassis integrated control system. Based on the MATLAB/Simulink and TrueTime Toolbox, the distributed CAN network...
H∞ control problem of networked control systems with clock-driven sensor, actuator and event-driven actuator is studied. The sufficient condition of the existence of H∞ control law state feedback is derived through Lyapunov theory and linear matrix inequality. Design method is also presented. A simulation example shows the proposed approach is valid.
This note studies the problem of stabilizing networked control systems (NCSs) over random time-delay channels. In order to reduce the negative influences of communication constraints including signal transmission delay, data packet dropout and quantization effect, a new method on the H∞ controller design is presented. The proof techniques rely on Lyapunov function and linear matrix inequality (LMI)...
This note presents the problem of stabilizing networked control systems over noisy communication channels, where there exist more dropout packet in transmission. A novel controller design method, which relies on Lyapunov theory, is proposed to stabilize an unstable plant. By the method, it is possible to reduce the effects of packet dropout and network-induced delays on stabilization of linear time-invariant...
The problem of H∞ control design for vibration reduction of a base isolated structure with limited wireless communication capacity is studied in this paper. The network under consideration is subjected to measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. Based on Lyapunov-Krasovskii functional (LKF) theory, some delay-range-dependent...
In this paper, the sliding-mode lag synchronization control scheme is proposed based on the neural network to synchronize two different delayed chaotic systems. An integral delayed sliding surface is presented to design the sliding mode control. The lag synchronization controller is achieved by combining the RBF (radial basis function) neural network with sliding-mode control. Numerical simulations...
In this paper, we consider a complex dynamical network with time-varying delays. We prove that the dynamical complex network is synchronized if the delays satisfy the linear matrix inequality. In addition, we analyze the synchronization of the given network based on the coupling configuration matrix and the delays of the synchronous target. Some simulations illustrate our theoretical results.
This paper deals with the problem of stochastic robust asymptotically stability for a class of uncertain stochastic nonlinear time-varying systems with time-delays. The parametric uncertainties are assumed to be time-varying and norm bounded. The time-delay factors are unknown and time-varying with known bounds. The aim of this paper is to design a memory less state feedback control law such that...
This paper is concerned with the controller design of networked control systems (NCSs) with time delay in the state derivatives. We employ a model of the NCSs with time delay in the state derivatives, taking into consideration both the network-induced delay and the time delay in the state derivatives. On the basis of the given model, a controller design method is proposed by using the delay-dependent...
In this paper, a new decentralized variable structure control scheme is proposed for a class of large-scale time-delayed systems with mismatched uncertainties. To overcome the defect that neither time-delay interconnection terms nor uncertainties satisfy the conventional matching conditions, the coefficient matrix of the switching function can be designed to satisfy a new matching condition, meanwhile,...
The robust output feedback stabilization problem for uncertain discrete-time Markov jump descriptor systems with time-varying delays is discussed. Based on the restricted system equivalent (r.s.e.) transformation and by introducing new state vectors, the discussed system is transformed into a discrete-time Markov jump standard linear system with time-varying delays. Then by discussing the transformed...
Aircrafts in commercial routes have been proposed in some previous work as a novel DTN bundle carriers. Satellites can be one of the hops in this application. DTN suffers from intermittent disconnections, long delays and has scarce resources. It is a challenge to control the admission to these resources to provide better QoS and ensure optimum resource utilisation. Furthermore, providing fairness...
Feedback delays are inherent attributes of distributed control systems that usually cause unfavorable effect on the stability of the controlled process. Modelling of such systems is essential for traceable controller synthesis. In this paper we apply the TP Model Transformation to derive a polytopic representation of an LPV model where the time-delay is considered as parameter. The method is introduced...
Farming consumes a large amount of water and a large portion of that water is wasted through inefficient distribution from rivers to farms. More efficient water distribution can be achieved with better control and decision support systems. In order to design such systems, river models are required. Traditionally, the Saint Venant equations which are partial differential equations, have been used for...
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