Tuning Of Fractional Order PID Controller For Interacting Systems By Different Methods

Vol. 2  Issue 3
Year:2014
Issue:May-Jul
Title:Tuning Of Fractional Order PID Controller For Interacting Systems By Different Methods
Author Name:D.V.L.N.Sastry, B.Anil Kumar, P. Kameswara Rao And G.S.S.S.S.V.Krishna Mohan
Synopsis:
A multi tank level control system is an example of interacting systems. In this paper, the authors considered two first order systems connected in series, one rectangular tank which has inflow of liquid into the tank and out flow. The outflow of first tank is the inflow for second tank through a control valve. The control System is intended to maintain the level of liquid in the second tank at some predefined value irrespective of changes of inflow to the first tank. Fractional Order PID (FOPID) controller is a powerful controllers used in process industries to regulate and control process variables. The errors of the process variables are minimized proportionally, integrally and derivatively. Fractional Order PID controller gives better results for changes in set point and disturbance rejections. The change in inflow or changes in predefined values are treated as disturbances to the process. According to these disturbances, they need to implement better tuning algorithms to Fractional Order PID controllers. In this paper, they implemented different Fractional Order PID control algorithms on a multi tank level control System and their responses are observed and also compared with Conventional PID controllers.

Tracking Path Control Of Robotic Manipulators Using Radial Basis Function Neural Network

Vol. 2  Issue 3
Year:2014
Issue:May-Jul
Title:Tracking Path Control Of Robotic Manipulators Using Radial Basis Function Neural Network
Author Name:Sheilza Jain and Anika Chhabra
Synopsis:
Robotic manipulators have been extensively used in the industrial applications such as paint spraying, welding, accurate positioning system etc. where joint angles of robotic manipulators are directed to follow some given trajectories as close as possible. Therefore, trajectory tracking problem of robotic manipulators is the most significant and fundamental task for researchers to work upon. Robotic manipulator systems are inevitably subject to structured and unstructured uncertainties resulting in imprecision of its dynamical models and it is difficult to obtain a suitable mathematical model for the robotic control scheme. Robotic manipulators are dynamically coupled, multi-inputmulti- output, non-linear and time variant complex systems. This paper presents the dynamics of two link robotic manipulator. In this paper, PID (Proportional Integral Derivative), CTC (Computed Torque Control), SMC (Sliding Mode Control) and RBFNN (Radial Basis Function Neural Network) controllers are designed and implemented to the joint position control of two link robotic manipulators for pre-defined trajectory tracking control. Simulated results for different controllers are compared to show reduction in tracking error and performance improvement of two link robotic manipulators. Tracking performance and error comparison graphs are presented to demonstrates the performance of the proposed controllers. Further, comparison between chattering of SMC and RBFNN-SMC for joint 1 and joint 2 is also shown. The simulation work is carried out in MATLAB environment.

Tuning of PI Controller for A Conical Tank Process with Fuzzy Rules

Vol. 2  Issue 3
Year:2014
Issue:May-Jul
Title:Tuning of PI Controller for A Conical Tank Process with Fuzzy Rules
Author Name:N. Gireesh and G. Sreenivasulu
Synopsis:
In many industries, there are few nonlinear elements present in the system. Many industries used conventional controllers like P, PI and PID for controlling the controlled variable of the process. Controlling the nonlinear processes is a challenging task. In this paper conventional PI controller parameters are tuned using Fuzzy rules for maintaining the liquid level in the conical tank at desired level. Fuzzy rule base reasoning method used to determine a tuning parameter α based on the error and the rate of change of error of the process. This tuning parameter is used to calculate the Proportional gain and Integral gain of the PI Controller. Time domain analysis and performance indices are calculated and compared with Zeigler Nichols tuning method

A Novel Approach To Control The Speed Of Induction Motor Using Wireless And Touchscreen Interfacing Technology

Vol. 2  Issue 3
Year:2014
Issue:May-Jul
Title:A Novel Approach To Control The Speed Of Induction Motor Using Wireless And Touchscreen Interfacing Technology
Author Name:Naveenkumar R Kulkarni, Shekhappa. G. Ankaliki, Shashikumar. R, Veeresh A G
Synopsis:
This article presents touch screen technology and its interfacing with a controller to control the speed of single phase induction motor. The main objective of this article is to use remote sensing and speed control of an AC motor using touch screen technology and microcontroller concept which is less space consumption and design [2]. In addition to speed control, this work has an additional function of providing safety to motors when it works in high temperature which is sense by the sensor. When the temperature of the motor exceeds certain limit, the motor turns off suddenly with an emergency alarm.

A Modified Fuzzy Logic Controller Based Maximum Power Point Tracking under Partial Shading

Vol. 2  Issue 2
Year:2014
Issue:Feb-Apr
Title:A Modified Fuzzy Logic Controller Based Maximum Power Point Tracking under Partial Shading
Author Name:A. Narendra and M. Sai Veerraju
Synopsis:
Under partial shading conditions, multiple peaks are observed in the power-voltage (P-V) characteristics curve of a photovoltaic (PV) array, and conventional maximum power point tracking (MPPT) algorithm may fail to track the global maximum power point (GMPP). In this paper a fuzzy-logic controller for global maximum power point tracking (GMPPT) is proposed to increase the performance during partial shading condition. A mathematical model of the PV system under partial shading conditions is derived. The proposed fuzzy logic based controller is implemented in MATLAB- SIMULINK.

Performance Analysis of PI And Fuzzy Logic Controller For Speed Control of PMBLDC Drive

Vol. 2  Issue 2
Year:2014
Issue:Feb-Apr
Title:Performance Analysis of PI And Fuzzy Logic Controller For Speed Control of PMBLDC Drive
Author Name:D. Ajitha, R. Suja and P. Melba Mary
Synopsis:
Brushless DC motors are widely used for many applications like industrial automation, home appliances and medical equipment because of their low EMI ,high efficiency, commutation done on windings and high reliability. This paper presents the simulation results of fuzzy logic and conventional PI controller for the position sensorless speed control of permanent magnet brushless DC motor. It is difficult to tune the parameter and get satisfied control characteristics by using conventional controller. Furthermore PI controller requires accurate mathematical model, as the Fuzzy logic controller has the ability to obtain satisfied control characteristics and it is easy for computing. The experiment results show the comparison of a fuzzy logic controller that has better performance than PI controller. The modeling, control and simulation of the BLDC motor have been done using the software package MATLAB/SIMULINK.

Development And Control of Robotic Arm For Coconut Plucking

Vol. 2  Issue 2
Year:2014
Issue:Feb-Apr
Title:Development And Control of Robotic Arm For Coconut Plucking
Author Name:C. Suganthi and E. Muppidathi 
Synopsis:
This thesis deals with the creation of a device that will climb towering palms to harvest (primarily) coconuts. It will foster not only a love for engineering, designing, and inventing, but also a feeling of pride and accomplishment in helping people who live in coconut-harvesting countries. There are no 100% safe coconut-harvesting devices currently in the market. Although there have been efforts made by many inventors, the most similar contraption is a coconut-climbing assistance device that assures efficiency, but not necessarily safety. The proposed coconut-climbing device will attempt to address both efficiency and safety. The design of the device has to be simple and enough for villagers to operate, yet work efficiently to appeal to the majority. Other design obstacles include creating a multi-axis arm, allowing the villagers to observe what is happening at the top of the tree, and maintaining the friction between the device and the tree when the device ascends and descends. A coconut plucking robot is created in hopes of saving lives and improving the living standards of many coconut-climbers.