2,202 research outputs found
Networked control system ā an overview
Networked Control System (NCS) is fetching researchersā
interest from many decades. Itās been used in industry which
range from manufacturing, automobile, aviation, aerospace to
military. This paper gives the general architecture of NCS and
its fundamental routes. It also touches to its advantages and
disadvantages and some of the popular controller which
include PID (Proportional-Integral-Derivative) and MPC
(Model Predictive Control)
Implementation of Model Based Networked Predictive Control System
Networked control systems are made up of several computer nodes
communicating over a communication channel, cooperating to control a
plant. The stability of the plant depends on the end to end delay from
sensor to the actuator. Although computational delays within the
computer nodes can be made bounded, delays through the
communication network are generally unpredictable. A method which
aims to protect the stability of the plant under communication delays
and data loss, Model Based Predictive Networked Control System
(MBPNCS), has previously been proposed by the authors. This paper aims
to demonstrate the implementation of this type of networked control
system on a non-real-time communication network; Ethernet.
In this paper, we first briefly describe the MBPNCS method, then
discuss the implementation, detailing the properties of the operating
system, communications and hardware, and later give the results on the
performance of the Model Based Predictive Networked Control System
implementation controlling a DC motor.
This work was supported in part by the Scientific and Technological Re
search Council of Turkey, project code 106E155
Time Delay Compensation and Stability Analysis of Networked Predictive Control Systems Based on Hammerstein Model
A novel approach is proposed for a networked control system with random delays containing a nonlinear process based on a Hammerstein model. The method uses a time delay two step generalized predictive control (TDTSGPC), which consists of two parts, one is to deal with the input nonlinearity of the Hammerstein model and the other is to compensate the network induced delays in the networked control system. Theoretical results using the Popov theorem are presented for the closed-loop stability of the system in the case of a constant delay. Simulation examples illustrating the validity of the approach are presented
Wireless model-based predictive networked control system over cooperative wireless network
Owing to their distributed architecture, networked control systems (NCSs) are proven to be feasible in scenarios where a spatially distributed feedback control system is required. Traditionally, such NCSs operate over real-time wired networks. Recently, in order to achieve the utmost flexibility, scalability, ease of deployment, and maintainability, wireless networks such as IEEE 802.11 wireless local area networks (LANs) are being preferred over dedicated wired networks. However, conventional NCSs with event-triggered controllers and actuators cannot operate over such general purpose wireless networks since the stability of the system is compromised due to unbounded delays and unpredictable packet losses that are typical in the wireless medium. Approaching the wireless networked control problem from two perspectives, this work introduces a practical wireless NCS and an implementation of a cooperative medium access control protocol that work jointly to achieve decent control under severe impairments, such as unbounded delay, bursts of packet loss and ambient wireless traffic. The proposed system is evaluated on a dedicated test platform under numerous scenarios and significant performance gains are observed, making cooperative communications a strong candidate for improving the reliability of industrial wireless networks
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