Sri Ramakrishna Engineering College

About: Sri Ramakrishna Engineering College is a based out in . It is known for research contribution in the topics: Computer science & Control theory. The organization has 1030 authors who have published 843 publications receiving 3822 citations.

Artificial neural network controller for improved performance of brushless DC motor

Abstract: This paper presents the development and performance analysis of model reference adaptive controller using Artificial Neural Network (ANN) for Brushless DC motor (BLDC) drives. The model reference adaptive systems (MRAS) have a parameter adjustment mechanism along with the normal feedback loop and hence give better solutions when there are variations in process parameters. Neural networks (NNs) with their inherent parallelism, learning capabilities and fault tolerance have proven to be a promising solution in estimating and controlling nonlinear systems. This paper combines a MRAS with ANN to solve the problems of non-linearity, parameter variations and load excursions that occur in BLDC motor drive systems. The performance of the traditional PID controller based speed control method is compared with the model reference based speed control for BLDC motor drive system using MATLAB Simulink software. Experimental results using TMS320LF2407A is presented to prove that the MRAC based model is capable of speed tracking as well as reduce the effect of parameter variations.

Voice recognition and touch screen control based wheel chair for paraplegic persons

Abstract: The wide spread prevalence of lost limbs and sensing system is of major concern in present day due to accident, age and health problems. To assist people with such defects, the proposed intelligent wheelchair system uses dual control for navigation in familiar environments. The two modes of input control to the wheelchair are voice recognition and touch screen. When one want to change the direction, the touch screen sensor is modelled by pressing finger against the various quadrants on the touch screen, which has different values programmed for different direction. This can also be controlled through simple voice commands using voice controller. By storing a single letter in voice recognition kit for each direction control, the recognition time is reduced drastically and thus quick reach to destination is obtained. The wheelchair consists of DC brushless motors at the rear end and it is controlled by using PWM technique. A brake control mechanism is included to control the wheelchair. From previous literature surveys observed, the accuracy of the touch screen was found to be 50%. In this proposed system achievement of wheelchair movement in all direction is obtained with an accuracy of 94.6%. Voice recognition has accuracy of 80.8% which is 30% higher than the study done by Prathyusha et al. This device helps the disabled to have automatic advancement to their destination through predefined paths in the indoor system.

Novel Design of Hybrid Steam Turbine Reflector Based Controller for Solar Power Plant

Abstract: The large-scale generation of electric power using solar energy stimulates the development of novel technologies by researchers with ultimate resource qualities. Solar energy collectors are the significant part of Solar Energy Thermal Power Plant (STP), which can be operated at a particular feasible range for utilizing the solar resource with its intermittent inputs. The life span of solar thermal power plant can be increased by designing the controller with a closed loop. The proposed hybrid design of solar plant involves a controller with closed loop transferring the solar energy to the heat transfer liquid, namely therminol oil, which acts as a medium for transferring heat in Parabolic Trough Collector (PTC) having single-phase flow. The concentrators are the parabolic reflectors focusing the rays on the line with a focal point using tracking mechanism having one axis. Solar collectors are utilized in the power converting technique of solar thermal energy, which concentrates sunlight for preparing Rankine cycle heat of high temperature. The steam turbine is driven by the superheated vapor using Rankine cycle with the shaft of the steam turbine connected to the generator for producing electricity. The life span of the Solar Energy Thermal Power Plant is enhanced as proposed design for solar collectors uses therminol oil as the heat transfer liquid. The controller design is implemented using Predictive Function Control (PFC) or Static Feed Forward (SFF) control with Proportional Integral Controller (PI) which provides the best performance with the added advantage of direct heat storage in the thermal plant. The simulated results are obtained for the proposed design of collector with the rate of change of variation and cost function of manipulated parameters, which are constant for the proposed controller but vary drastically for the conventional PI controller.

Microstructure and properties of YSZ-Al2O3 functional ceramic thermal barrier coatings for military applications

Abstract: Current study renders its focus on the investigation of functionally graded Yttria Stabilized Zirconia (YSZ) and alumina (Al2O3) thermal barrier coatings (TBC) deposited on EN steel substrates used in gun barrel through atmospheric plasma spray (APS) process. A bond coat and the top coats was made with two distinct compositions using YSZ-Al2O3 in 75:25 and 50:50 weight ratio through APS process with two carrier gas concentrations of 3 and 4 standard cubic feet per hour (scfh). Coatings were characterized with thermal testing, X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscope examination (FESEM). Surface roughness test, wear and scratch test of the uncoated and coated steel specimens was also measured. YSZ-Al2O3 coated EN36C steel possessed greater insulation performance under a carrier gas flow rate of 3 scfh compared to all other specimens. EN36C steel coated with YSZ-Al2O3 in the ratio of 75:25 has better wear and scratch resistance indicating lesser deformation compared to other materials.

Power Quality Issues, Solutions and Standards: A Technology Review

Abstract: Classically, the aim of the electric power system is to generate electrical energy and to deliver this energy to the end-user equipment at an acceptable voltage. As nonlinear loads draw harmonic and reactive power components of current from ac mains, the quality of power deteriorates. This paper presents a review of the main power quality (PQ) problems with their associated causes and solutions with codes and standards. This paper concludes with some solutions to mitigate the Power Quality problems are presented.