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Software-defined networking (SDN) has been proposed as a new networking paradigm which separates the control and data forwarding planes. The controllers deployed as centralized network control entities are crucial for meeting the performance and efficiency requirements of these systems. The placement of these network entities, switch assignment and their load-aware operation are challenging research...
In this paper, nature inspired firefly algorithm has been used for designing of controllers for set-point response and stability purpose. Using firefly algorithm, we have tuned the parameters of above two controllers. A performance criteria integral square error (ISE) is optimized using firefly optimization technique. For the optimum value of ISE, controller parameters are selected. Routh Stability...
This paper presents a new PID congestion controller design for transmission control protocol (TCP) networks. It would be possible to efficiently control the TCP traffic in the proposed control scheme. This would be done via the use of only the queue length at router needless to know the TCP window size which is not accessible at the routers side. The stability condition is presented by applying linear...
This paper discusses a new method to describe movements by fuzzy predictors and to design new open loop fuzzy controllers, for multilinked vehicles or mobile robots, using constant step approximators to model complex maneuvers with delays that vary with the robot's configuration. The “Wang & Mendel” technique for automatic modeling is tested and an ad hoc heuristic is proposed to fulfils the deficiencies...
Nowadays, many new polymer materials have been widely used in different chemical production areas. The polymerization temperature is an important parameters of process control, but has characteristics of time-delay and inertial, so the ordinary PID control is difficult to obtain good effect. In order to control the system steadily and accurately, we suggest a compound control method, which combines...
In the continuous casting process, the steel level in the mold is controlled using a stopper rod as the flow control actuator and a level sensor. Various control strategies are used in order to reduce the mold level fluctuations which strongly affect the surface quality of the final product. Indeed, under certain casting conditions, the plant is often disturbed by periodic phenomena, in particular...
Material or fluid transportation is a commonly encountered phenomenon in industrial applications, generating variable time delay that makes the design of feedback control loops more difficult. This paper investigates the applicability of MPC (Model Predictive Control) strategies to this type of processes. The experimental setup consists of a heated tank, of which the outlet temperature (measured at...
This papers proposes a novel climate control strategy for mine extraction rooms based on the receding horizon optimal control scheme. Being a model-based procedure, the development of a pertinent prediction model is one of the keystones. According to recent technological advances, we consider that distributed measurements are available and provided by a wireless network. An enhanced modeling approach,...
This work approaches the problem of robust control for first-order plus time delay plants. The goal is investigate the potentials of a nonlinear/hybrid compensator previously developed by authors, referred to as the PI+CI compensator, in the control of a process with significant parametric uncertainty. To this end, the design of PI+CI has been made in two steps: first, a base robust PI compensator...
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