GA Based PID Control of Magnetic Levitation System

Vol.1  No.4

Year : 2013

Issue : Aug-Oct

Title : GA Based PID Control of Magnetic Levitation System

Author Name : S. KISHORE, D. VASANTHI

Synopsis :

The Magnetic levitation system serves as a simple model of devices, which are becoming popular in recent years. Magnetic Levitation System is a nonlinear, unstable system that can be applied in many application area such as in magnetic bearings, high speed trains, vibration isolation tables in semiconductor manufacturing, levitation of wind power generation, levitation of molten metal in induction furnaces, position tracking and levitation of metal slabs during manufacturing. The Magnetic levitation system can be categorized as a repulsive system and this system is based on the source of levitate forces. Since it is highly nonlinear and unstable system, it is very challenging in order to construct the high performance controllers to regulate the position of the levitation ball. This work involves the design of PID controller, Optimized PID controller. The real time implementation on the magnetic levitation kit has been carried out.In the above work, we acquired a high precision control to levitate a steel ball in the desired position.

For more details:

imanagerpublications.com

Fuzzy Logic Controller-An Advanced & Efficient Technique for Controlling Drives

Vol.1  No.4

Year : 2013

Issue : Aug-Oct

Title : Fuzzy Logic Controller-An Advanced & Efficient Technique for Controlling Drives

Author Name : R. SUMAN

Synopsis :

The basic idea is to design a fuzzy logic hysteresis comparator-based direct torque control scheme of an induction motor under varying dynamic conditions[1]. The major problem that is usually associated with DTC drive is the high torque ripple. To overcome this problem a torque hysteresis band with variable amplitude is proposed based on fuzzy logic[4]. The fuzzy logic controller is used to adjust the bandwidth of the torque hysteresis controller in order to reduce the torque and flux ripples and, to improve motor dynamic response[3],[4]. Based on the slopes of motor-estimated torque and stator current, an FLC is designed to select the optimum bandwidth of the torque hysteresis controller. In order to test the performance of the proposed FLC-based DTC scheme for IM drive, a complete simulation model is developed using MATLAB/Simulink.

For more details:

imanagerpublications.com

A Closed Loop Transformer Monitoring Using Virtual Instrumentation

Vol.1  No.4

Year : 2013

Issue : Aug-Oct

Title : A Closed Loop Transformer Monitoring Using Virtual Instrumentation

Author Name : Saranya Ponnuswamy, S. Manoharan

Synopsis :

This paper proposes a new concept for monitoring the remote electrical parameters like voltage, current, oil temperature, oil level, active power, reactive power, apparent power, power factor of a remotely located distribution transformer and to transmit it over a communication network and these real time values are displayed using Virtual Instrumentation platform on the PC which is located at the Substation. In addition, it will protect the distribution transformers from various faults like over current and over voltage. Distribution transformers which are the critical components in power distribution systems are located on the feeders of the substation and monitoring of which is a long time need and there is no proper medium for it.

For more details:

imanagerpublications.com

Implementation of PI, PD and PID Controllers on FPGA for Process Control

Vol.1  No.4

Year : 2013

Issue : Aug-Oct

Title : Implementation of PI, PD and PID Controllers on FPGA for Process Control

Author Name : RAVI KUMAR KORIDE

Synopsis :

This paper presents the hardware design methodology of digital control systems with different control algorithms. The control system is designed using Xilinx Spartan 3E FPGA, which consists of Analog Capture Circuit, PWM signal generator and other essential modules to control the process. The National Instruments LabVIEW is chosen as the software platform to interface with the FPGA kit. The hardware has been designed to study the Static as well as Dynamic characteristics of DC Motor, with three different control algorithms such as PI,PD and PID. The Ziegler Nichols method has been employed for tuning of controller parameters and the responses of three control algorithms are compared. The novelty in the project has been the measurement of speed, which is done through the design of Timer & Counter using the software, rather then employing the Tachometer, hence reducing the cost.

For more details:

imanagerpublications.com

Methods of Placement and Installation of UFM to Extend the Linearity Range of Measurement

Vol.1  No.4

Year : 2013

Issue : Aug-Oct

Title : Methods of Placement and Installation of UFM to Extend the Linearity Range of Measurement

Author Name : Sheikh Rafik Manihar Ahmed

Synopsis :

This paper explains the different Methods of Placement and Installation of Ultrasonic Flow Measuring Instrument on the Pipe of different configuration to extend the linearity range of measurement up to maximum of the input range. Accurate flow measurement is an essential requirement both from qualitative and economic points of view. Among the non contact type of flow measurement, Ultrasonic Flow Measurement (UFM) is widely used to measure flow, because of its advantage like high resolution and less interference of noise on output. However, non linear characteristics of Ultrasonic flow meters have restricted its use [1-2]. But the different arrangement and Installation method helps us to understand, how to linearise the overall system to maximise its full scale range and to make it adaptive to variations in pipe diameter, liquid density, and liquid temperature [3-4]. A flowmeter installed in such a pipeline should indicate the volumetric flowrate correctly and independently of the flow profile. The ultrasonic flowmeter integrates, or averages, the velocity along its measuring paths [8- 11]. Clamp-on transducers eliminate in-line installation, allowing one meter to be used at many locations. For easy installation, no moving parts and no contact between transducer and Fluid is required. Exterior installation eliminates pressure losses and prevents leaking that can be associated with in-line meter installations [15].

For more details:

imanagerpublications.com

Certain Investigations On Teleophthalmology To Develop An Integration System For Diabetic Retinopathy And Age Related Macular Disease

Vol.1  No.3

Year: 2013

Issue: May-Jul

Title : Certain Investigations On Teleophthalmology To Develop An Integration System For Diabetic Retinopathy And Age Related Macular Disease

Author Name : E.Sivasankari, R.Jayanthi

Synopsis :

Teleophthalmology has the potential to help in electronic delivery of diagnostic and healthcare services to remote rural population. It enables one or more ophthalmologists to remotely examine a patient's condition via public Internet networks. Large bandwidth is necessary for transmitting retinal images over the wireless network. So there is an immense need for high speed and efficient transmission and reduction in storage space resourceful compression techniques is essential. The main goal of proposed work is to provide an efficient tool for defining to maximize compression and reconstruct image portions lossless. This paper is proposed to analyze multiple compression techniques based on Region of Interest (ROI). In the diagnosis of retinal images, the significant part is separated out from the rest of the image using improved adaptive fuzzy C means algorithm and Integer multi wavelet transform is applied to enhance the visual quality in significant part. The region of less significance are compressed using SPIHT algorithm and finally modified embedded zero tree wavelet algorithm is applied which uses six symbols was applied whole image then Huffman coding is applied to get the compressed image for transmission. The compressed medical data are transmitted over transmission control protocol (TCP) network. The proposed algorithm would have given better quality, if the images will use ROI compared to that of the other methods. The performance of proposed system had evaluated based on Compression Ratio (CR), Peak Signal to Noise Ratio (PSNR), Normalized Average Error (NAE), Average Difference (AD), Maximum Difference (MD), Mean square error (MSE), Root Mean Square error (RMSE), Signal to Noise Ratio (SNR),Normalized cross correlation (NCC), Structural Content (SC),Encoding and Decoding time. The new compression and transmission algorithm shows a better efficiency for retinal image. The result analyzed using MATLAB and realized in hardware. As a result, the Teleophthalmology is provided the remote patients with a cost-effective access to specialist's eye checkups at primary healthcare clinics, and at the same time, minimize unnecessary face-to-face consultation at the hospital specialist's center.

Tuning Of Analog Controllers For Superheated Steam Temperature System Using Genetic Algorithm

Vol.1  No.3

Year: 2013

Issue: May-Jul

Title : Tuning Of Analog Controllers For Superheated Steam Temperature System Using Genetic Algorithm

Author Name : Yasmine begum, Venkata Marutheswar

Synopsis :

This paper explains the tuning of analog controllers P, PI and PID for superheated steam temperature system using Genetic Algorithm based on ISE, IAE and ITAE as the objective function. The analog controllers have a wide range of applications in industrial control. The fifth order model of superheated steam temperature system is taken for study. Most –τs of the tuning algorithms are based on FOPTD models which is given by G(s) = Ke /(Ts+1). If the plant is not approximated well to FOPTD model, good controllers may not be designed using existing algorithms. Genetic algorithm is a stochastic algorithm based on principles of natural selection and genetics. To tune the analog controllers using genetic algorithm, it does not require any FOPTD model. Hence the analog controllers P, PI and PID are tuned using genetic algorithm for superheated steam temperature system and the results are compared.

Performance Optimization Of Regenerative Feed Water System In Thermal Power Plant

Vol.1  No.3

Year: 2013

Issue: May-Jul

Title : Performance Optimization Of Regenerative Feed Water System In Thermal Power Plant

Author Name : ANKUR GARG

Synopsis :

The significant efficiency advantage of the Carnot cycle over the Rankine cycle is due to the fact that in the Carnot cycle all external heat addition is at a single high temperature and all external heat rejection at a single low temperature. The Rankine-cycle thermal efficiency could be improved by increasing the average water temperature at which heat is received. This could be accomplished by an internal transfer of heat from higher-temperature steam to lowtemperature feed water. An internal transfer of heat that reduces or eliminates low-temperature additions of external heat to the working fluid is known as regeneration. Regeneration is accomplished in all large-scale, modern power plants through the use of feed water heaters. A Feed Water Heater (FWH) is a heat exchanger in which the latent heat (and sometimes superheat) of small amounts of steam is used to increase the temperature of liquid water (feed water) flowing to the steam generator. There are two types of feed water heaters, (i) Open Feed water heaters and (ii) Closed Feed water heaters.

Segmentation Of Brain MRI Images For Tumor Detection By Optimizing C-Means Clustering Method

Vol.1  No.3

Year: 2013

Issue: May-Jul

Title : Segmentation Of Brain MRI Images For Tumor Detection By Optimizing C-Means Clustering Method

Author Name : kailash sinha, G.R. Sinha

Synopsis :

Magnetic Resonance Imaging (MRI) is one of the best technologies currently being used for diagnosing brain tumor. Tumor detection and segmentation from MRI image is very important in medical imaging but apart from time taken in diagnosis accuracy of detection is also poor. For segmentation of medical images, clustering techniques such as kmeans and c-means clustering methods are widely used. The authors have implemented c-means clustering method and optimized its performance by using genetics algorithm. The combined approach resulted in improvement of segmentation efficiency and higher value of true positive pixels belonging to tumor region.