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Search Results: 1 - 10 of 325704 matches for " S. Saravanan "
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Single Phase Induction Motor Drive with Restrained Speed and Torque Ripples Using Neural Network Predictive Controller  [PDF]
S. Saravanan, K. Geetha
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.711309
Abstract: In industrial drives, electric motors are extensively utilized to impart motion control and induction motors are the most familiar drive at present due to its extensive performance characteristic similar with that of DC drives. Precise control of drives is the main attribute in industries to optimize the performance and to increase its production rate. In motion control, the major considerations are the torque and speed ripples. Design of controllers has become increasingly complex to such systems for better management of energy and raw materials to attain optimal performance. Meager parameter appraisal results are unsuitable, leading to unstable operation. The rapid intensification of digital computer revolutionizes to practice precise control and allows implementation of advanced control strategy to extremely multifaceted systems. To solve complex control problems, model predictive control is an authoritative scheme, which exploits an explicit model of the process to be controlled. This paper presents a predictive control strategy by a neural network predictive controller based single phase induction motor drive to minimize the speed and torque ripples. The proposed method exhibits better performance than the conventional controller and validity of the proposed method is verified by the simulation results using MATLAB software.
Solar PV System for Energy Conservation Incorporating an MPPT Based on Computational Intelligent Techniques Supplying Brushless DC Motor Drive  [PDF]
R. Anand, Dr. S. Saravanan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78142
Abstract: This paper proposes an effective Maximum Power Point Tracking (MPPT) controller being incorporated into a solar Photovoltaic system supplying a Brushless DC (BLDC) motor drive as the load. The MPPT controller makes use of a Genetic Assisted Radial Basis Function Neural Network based technique that includes a high step up Interleaved DC-DC converter. The BLDC motor combines a controller with a Proportional Integral (PI) speed control loop. MATLAB/Simulink has been used to construct the dynamic model and simulate the system. The solar Photovoltaic system uses Genetic Assisted-Radial Basis Function-Neural Network (GA-RBF-NN) where the output signal governs the DC-DC boost converters to accomplish the MPPT. This proposed GA-RBF-NN based MPPT controller produces an average power increase of 26.37% and faster response time.
A Correlative Study of Perturb and Observe Technique and GA-RBF-NN Method Supplying a Brushless DC Motor  [PDF]
R. Anand, Dr. S. Saravanan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78143
Abstract: A comparative study is done in regards to the performance of the popular Perturb and Observe algorithm and the Genetic Assisted-Radial Basis Function-Neural Network (GA-RBF-NN) algorithm, both incorporating the Interleaved Boost converter. The Perturb and Observe method (P&O) is inarguably the most commonly used algorithm as its advantages pertaining to its ease in implementation and simplicity enable to track the Maximum Power Point (MPP). However, it is absolutely unreliable when subjected to rapidly fluctuating irradiation and temperature levels. More importantly, the system has the tendency to swing back and forth about the Maximum Power Point without reaching stability. At this juncture, the implementation of the Genetic-Assisted Radial Basis Function (GA-RBF) algorithm helps the system achieve MPP at a shorter time when compared to the Perturb and Observe technique. The ever reliable and robust Levenberg-Marquardt algorithm is included along with the MPPT controller that minimizes the Mean Square Error (MSE) and aids in faster training of the neural network. This PV system drives a brushless DC motor (BLDC), employing rotor position sensors.
Capacitor Pattern H-Bridge Multilevel Inverter (CPHMLI) Using Phase Diposition Pulse Width Modulation for Grid Applications  [PDF]
M. S. Saravanan, R. Jeyabharath
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.710282
Abstract: This work presents an implementation of an innovative single phase multilevel inverter using capacitors with reduced switches. The proposed Capacitor pattern H-bridge Multilevel Inverter (CPHMLI) topology consists of a proper number of Capacitor connected with switches and power sources. The advanced switching control supplied by Pulse Width Modulation (PDPWM) to attain mixed staircase switching state. The charging and discharging mode are achieved by calculating the voltage error at the load. Furthermore, to accomplish the higher voltage levels at the output with less number of semiconductors switches and simple commutation designed using CPHMLI topology. To prove the performance and effectiveness of the proposed approach, a set of experiments performed under various load conditions using MATLAB tool.
Three Phase Dual Input Direct Matrix Converter for Integration of Two AC Sources from Wind Turbines  [PDF]
M. Saravanan, T. S. Sivakumaran
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.711318
Abstract: This project proposes a novel dual-input matrix converter (DIMC) which is used to integrate the output of the wind energy to a power grid. The proposed matrix converter is developed based on the traditional indirect matrix converter under reverse power flow operation mode, but with its six-switch voltage source converter replaced by a nine-switch configuration followed by the current source inverter (CSI). Matrix electric power conversion topologies and their switch functions are flexible and are used for specific applications. With the additional three switches, the proposed DIMC can provide six input terminals, which make it possible to integrate two independent AC sources from two independent wind turbines into a single grid tied power electronics interface. Commanded currents can be extracted from the two input sources to the grid. The proposed PI control and modulation schemes guaranteed sinusoidal input and output waveforms as well as reduced THD. The simulation results are provided to validate the effectiveness of the proposed control and modulation schemes for the proposed converter.
Potential littoral sediment transport along the coast of South Eastern Coast of India
Saravanan,S; Chandrasekar,N;
Earth Sciences Research Journal , 2010,
Abstract: in the nearshore zone ofpresent study area, the movement ofsand alongshore is due to the action ofwaves and currents. the sediment movement along the shoreline ofstudy area is mainly governed by the forces associated with the incoming wavesandtheavailabilityofsedimentswithinthearea. thepresentinvestigationhasbeenmadeasanattempttoappreciate the sediment movement in relation to wave activity along the coast. the longshore sediment transport is higher in the northerly direction as compared to southerly direction. the normal condition is for and to be moved annually or more frequently in the shallows and on the beach. waves and wave-driven currents cause longshore drift ofsand alongthe beach and offshore. the net erosive nature of the study area (except kanyakumari) from march to october is due to the prevalence ofhigh waves from s and se directions.
Effect of single double bond in the fatty acid profile of biodiesel on its properties as a CI engine fuel
S. Saravanan, G. Nagarajan
International Journal of Energy and Environment , 2011,
Abstract: Fatty acid profile of the vegetable oil and animal fats plays a major role in determining the properties of biodiesel derived from them. Eventhough the type of fatty acids in vegetable oils are similar, their distribution is different. The percentage distribution of fatty acids differs by a significant magnitude with respect to the type of vegetable oil. In the present investigation the effect of single double bond fatty acids in the vegetable oil on its physical and chemical properties are investigated. Different vegetable oils based on the type and geography were selected and the properties of biodiesel derived from it were analysed with respect to its fatty acid of single double bond. From the results of the investigation it is inferred that the fatty acids with single bond plays an important role in determining the properties of biodiesel as a CI engine fuel.
Onset of Vibrational Convection in a Binary Fluid Saturated Non-Darcy Porous Layer Heated from Above
Sivakumar T.,Saravanan S.
MATEC Web of Conferences , 2012, DOI: 10.1051/matecconf/20120106005
Abstract: A linear stability analysis is used to investigate the influence of mechanical vibration on the onset of thermosolutal convection in a horizontal porous layer heated and salted from above. Vibrations are considered with arbitrary amplitude and frequency. The Brinkman extended Darcy model is used to describe the flow and the Oberbeck-Boussinesq approximation is employed. Continued fraction method and Floquet theory are used to determine the convective instability threshold. It is found that the solutal Rayleigh number has the stabilizing effect. The existence of a closed disconnected loop of synchronous mode is predicted in the marginal curve for moderate values of solutal Rayleigh number and vibration amplitude.
Test Data Compression Based on Threshold Method for Power Reduction
S. Saravanan,G. Elakkiya
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Testing a given circuit is a very important issue in todayOs situation due to high test cost. Tester mainly focuses on power dissipation and test data volume. Compression technique is implemented to reduce test power which causes the chip failure and is also used to reduce test data size. This study discusses reduction of test data and scan chain shift-in power. Proposed method on compressing test data is done by threshold method for unspecified test patterns. Appropriate indexing and encoding is done in this method. An analysis of shift in power is carried out for encoded compressed pattern by considering its switching activity. Experimental results prove that the proposed method can produce rapid reduction in test data volume and shiftin power.
Pollen-pistil Interaction in Wide Crosses Involving Gossypium hirsutum L. and Gossypium arboreum L.
S. Saravanan,K. Koodalingam
Asian Journal of Plant Sciences , 2005,
Abstract: The competitiveness of pollen tube growth in wide crosses involves Gossypium hirsutum and Gossypium arboreum was studied in six backcross entries. During the process of pollination and fertilization, physical and physiological constraints led to reduction of pollen tube growth under different levels of pistils. The differences in the number of germinating pollen grains on the stigma among the different crosses are maintained when the pollen tubes penetrate the transmitting tissue and grow along the first half of the style. The differences among entries for pollen tube growth at different levels of pistils was more significant at initial level than at later stages. A reduction in the number of pollen tubes growing down the style was recorded in all the treatment over different levels of pistils. The differences in reduction of 50.34% of pollen tube was noticed in the cross (Sahana x PA 255) x Sahana while (MCU 12 x PA 255) x MCU12 exhibited higher level of pollen tube proliferation. The crosses (MCU 12 x PA 255) x MCU 12 exhibited significantly lower value of pollen tube proliferation at different levels of pistils. Stylar attrition was determined from the pollen tube not reaching the ovary. Stylar attrition was maximum in the cross (MCU 12 x PA 255) x MCU 12 and is minimum in the cross, (Sahana x PA 255) x Sahana. Though a very low pollen germination over stigmatic surface noticed in (MCU 12 x PA 255) x MCU 12, lower stylar attrition of 33.53% was reported. A reduction in the number of pollen tubes as they grow along the style was observed. The genetic system of pollen pistil interaction seems to be more conspicuous in the upper part of the style than in the lower half and hence fertilization does not depend uniquely on passive physical or physiological constraints by the pistil but also on the genetic interactions among the male gametophytes and the female tissues.
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