International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
EFFECTS OF TIME DELAY ON DIFFERENT TYPES OF CONTROLLER FOR NETWORKED CONTROL SYSTEMS: A REVIEW Meghanasingh Research scholar Department of electrical engineering Jabalpur engineering college, Jabalpur (India) ----------------------------------------------------------------------------------------------------------------------------------------------Abstract: Networked Control Systems (NCSs) are spatially distributed systems for which the communication between sensors, Actuators and controllers is supported by a shared network. Due to the transfer data through the network between each node, NCS is running with some problems such as communication time delay and data packet loss. In this paper were view different types of controller used for compensation of time delay in NCS. Keywords: NCS, DC servomotor, PID controller,Fuzzy Logic, smith compensator. Introduction: With the development of network technology, network control system (NCS) has been an active research hot spot in recent years. Network control system (NCS) are the systems in which the communication sensors, actuators and controllers occur through a shared band –limited digital communication network [1].The control system constructed by network has many excellent character, such as high expandability ,flexible structure , low cost, reliability etc. But at the same time it has some drawbacks like time delay and packet loss which cannot be avoided [2]. Fig 1 shows the basic block diagram of network control system. This paper mainly discuss about DC servomotor (which plays the role of plant), PID controller, Fuzzy controller and smith controller (which plays the role of controller).
Here: r(t) is input ,y(t) is output,τkca is time delay from controller to actuator,τkscis time delay from sensor to controller. Dc servo motor: The DC servomotor is a device which converts electric energy into mechanical energy. One of the important feature of DC servomotor is that its output shaft can be moved to specific angular position. Usually small motors which are used in laboratory is DC servomotor . It is an electromechanical device in which the electrical input determines the position of motor
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