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Satyanarayana B.,VNR Vignana Jyothi Institute of Engineering and Technology | Ranga Janardhana G.,Jawaharlal Nehru Technological University Anantapur | Hanumantha Rao D.,MVSR Engineering College
Indian Journal of Engineering and Materials Sciences | Year: 2013

Inconel 718, a Nickel based super alloy which has wide applications in aerospace industry particularly in the hot sections of gas turbine engines due to their high temperature strength and corrosion resistance. It is known as being among the most difficult-to-cut materials. This paper presents an optimum process parameters (speed, feed and depth of cut) to minimize the cutting force, surface roughness and tool flank wear together in CNC high speed dry turning of Inconel 718 using Taguchi method based Grey relational analysis. The study involved nine experiments based on Taguchi orthogonal array and the result indicates that the optimal process parameters are 60 m/min for speed, 0.05 mm/rev for feed and 0.2 mm for depth of cut from the selected range. Also the significant process parameters have been found out for the above process optimization by performing ANOVA. Confirmation tests with the optimal levels of cutting parameters are carried out in order to illustrate the effectiveness of the method.

Ponnapalli M.,MVSR Engineering College | Rao P.V.R.R.B.,Indian Defence Research And Development Laboratory
Proceedings - 6th International Advanced Computing Conference, IACC 2016 | Year: 2016

A real-time system should operate correctly within deadlines. A failure in response will lead to loss of human life or a big damage to the property. The systems are sometimes considered only mission critical, with mission being very expensive. A Mission Critical System needs study real time software which is highly complex and is vital for the success of the mission. The mission capability depends on this software and proves catastrophic in case of any failure. The software design of real-time system is very complex. To keep in pace with today's modern computing technology the real-time software should adopt new software design methodologies. This paper brings out a comparison of various design methodologies that has evolved over time. The shortcomings of each method to satisfy the requirements of real-time system and the need for a generalized approach as Design patterns. © 2016 IEEE.

Nayanatara C.,Sri SaiRam Engineering College | Baskaran J.,Adhiparasakthi Engineering College | Kothari D.P.,MVSR Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2016

This paper presents a novel hybrid optimization algorithm for optimizing the Distributed Generation (DG) parameters in deregulated power system which improves the stability, reduces the losses and also increases the cost of generation. This Hybrid algorithm which includes Fuzzy-Genetic Algorithm (FGA) is used to optimize the various DG parameters simultaneously. The various parameters taken into consideration are their type, location and size of the DG devices. The simulation was performed on a distribution system and modeled for steady state studies. The optimization results are compared to the solution given by another search method like Genetic Algorithm (GA) and Micro Genetic Algorithm (MGA). The results reveal the benefits of the proposed method, for solving simultaneous combinorial problems of DG devices in a power system network. © 2015 Elsevier Ltd All rights reserved.

Parmar K.P.S.,National Power Training Institute | Majhi S.,Indian Institute of Technology Guwahati | Kothari D.P.,MVSR Engineering College | Kothari D.P.,Indian Institute of Technology Delhi
International Journal of Electrical Power and Energy Systems | Year: 2014

In this paper, an interconnected power system with multi-source power generation is proposed for load frequency control (LFC) in deregulated power environment. Keeping in view the new power environment, modified LFC scheme is proposed in deregulated environment for multi-source combination of hydro, reheat thermal and gas generating units in each control area. Optimal output feedback controller with pragmatic viewpoint is presented which uses less number of state variables for feedback as measurement of all of the state variables of a large system is impossible in the real world. The proposed controller incorporates all possible power transactions taking place in a deregulated power market. An extensive analysis is done for LFC and it is found that dynamic responses obtained satisfy the LFC requirements in deregulated power environment. © 2013 Elsevier Ltd. All rights reserved.

Durga Prasad P.V.,MVSR Engineering College | Gupta A.V.S.S.K.S.,JNTUH College of Engineering
International Communications in Heat and Mass Transfer | Year: 2016

An investigation is made experimentally with an attempt to enhance the rate of heat transfer of Al2O3 nanofluid in a U-tube heat exchanger with twisted tape insert. The heat transfer coefficients and the corresponding friction factors needed for performance analysis are determined at variable operating conditions of the heat exchangers with particle volume concentration of 0.01% and 0.03% and twist ratios ranging between 5 and 20. Experimental data are obtained at flow rates ranging from 0.0333 to 0.2667 kg/s and Reynolds number ranging from 3000 to 30,000. The Nusselt number of entire pipes for 0.03% concentrations of nanofluid with twisted tape inserts is enhanced by 31.28% compared to water while the friction factor is increased by 1.23 times compared to water with twisted tape insert of H/D = 5. Correlations are developed to estimate the Nusselt number and friction factor. The results of the investigation indicated significant improvement in the performance parameters of the heat exchanger with a rise in volume concentration of the nanoparticle. © 2016 Elsevier Ltd.

Kandasamy J.,MVSR Engineering College | Hussain M.M.,JNTUH College of Engineering | Rajesham S.,Pulla Reddy Institute of Technology
Materials and Manufacturing Processes | Year: 2012

Friction stir welding (FSW) experiments are conducted on AA7075 and AA6061 alloys under optimized conditions with copper as intermediate inclusion on the faying sides of the base material assisted by external heating from the root side during the process. The concept behind the experimentation is to minimize the temperature gradient that exists between the top and bottom sides of the plates. The work attempts to relocate the crack initiation point from the root of the retreating side, as in conventional friction stir weldments due to the variation in material flow along the weld cross-section. Analysis of the formed intermetallic compound (IMC) indicates that the interaction of AA7075, AA6061 alloys with copper, in coating form, enhances the bond strength by formation of Al2Cu and Al4Cu9 IMCs. High thermal conductivity of the copper in coating form along with external heating from the root side has minimized the temperature gradient and maintains homogenous material flow in the weld zone and increased bond strength. © 2012 Copyright Taylor and Francis Group, LLC.

Narang N.,Thapar University | Dhillon J.S.,Sant Longowal Institute of Engineering And Technology | Kothari D.P.,MVSR Engineering College
Applied Soft Computing Journal | Year: 2014

Paper presents predator-prey based optimization (PPO) technique to obtain optimal generation scheduling of short-term hydrothermal system. PPO is a part of the swarm intelligence family and is capable to solve large scale non-linear optimization problems. PPO based algorithm combines the idea of particle swarm optimization concept with predator effect that helps to, maintain diversity in the swarm and preventing premature convergence to local sub-optimal. In this paper first of all feasible solution is obtained through random heuristic search and then thermal and hydro power generations are searched for optimum hydrothermal scheduling problem using PPO. Variable elimination method is implemented to handle the equality constraint by eliminating variable explicitly. These eliminated variables are considered by penalty method restricts slack units with in limits. Slack thermal generating unit for each sub-interval handles power balance equality constraint and slack hydro units handle water equality constraint. The performance of the proposed approach is illustrated on, fixed-head and variable-head hydrothermal power systems. The results obtained from the proposed technique are compared with the existing technique. From the numerical results, it is experienced that the PPO based approach is able to provide a better solution. © 2014 Elsevier B.V.

Saravanan B.,Vellore Institute of Technology | Vasudevan E.R.,Vellore Institute of Technology | Kothari D.P.,MVSR Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2014

The evolutionary algorithm of invasive weed optimization algorithm popularly known as the IWO has been used in this paper, to solve the unit commitment (UC) problem. This integer coded algorithm is based on the colonizing behavior of weed plants and has been developed to minimize the total generation cost over a scheduled time period while adhering to several constraints such as generation limits, meeting load demand, spinning reserves and minimum up and down time. The minimum up/down time constraints have been coded in a direct manner without using the penalty function method. The proposed algorithm was tested and validated using 10 units and 24 h system. The most important merit of the proposed methodology is high accuracy and good convergence speed as it is a derivative free algorithm. The simulation results of the proposed algorithm have been compared with the results of other tested algorithms for UC such as shuffled frog leaping, particle swarm optimization, genetic algorithm and Lagrangian relaxation and bacterial foraging algorithm. © 2013 Elsevier Ltd. All rights reserved.

Janaki M.,Vellore Institute of Technology | Prabhu N.,NMAM Institute of Technology | Thirumalaivasan R.,Vellore Institute of Technology | Kothari D.P.,MVSR Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2014

The Voltage Source Converter based HVDC provides asynchronous interconnection between two AC systems. The use of VSC HVDC enables independent control of real and reactive power. Unlike conventional HVDC, the VSC HVDC does not cause Subsynchronous Resonance (SSR) when it is close to turbo-generators. The system strength of long ac transmission line can be enhanced by providing series compensation. However, there is a possibility of SSR interaction with turbine-generator due to the presence of the series capacitor in transmission line and may lead to shaft failure of the turbine-generator. The objective of this paper is to analyze the damping of subsynchronous resonance when the series compensated long AC line and VSC HVDC are originated from the same substation. A simple method for the extraction of subsynchronous component of line current using filter is proposed. The extracted subsynchronous frequency current is injected by the VSC HVDC converter close to the turbine-generator. This suppresses the subsynchronous current flowing through the generator and increases the damping of the system at critical torsional frequencies. This technique is termed as Subsynchronous Current Injection (SSCI). Subsynchronous current injector is designed using D-Q model of VSC HVDC. Genetic Algorithm (GA) is used for tuning the converter controllers and filter parameters. The results show the effectiveness of the proposed subsynchronous current injector in damping of SSR. © 2013 Elsevier Ltd. All rights reserved.

Sujatha G.,MVSR Engineering College | Azeem M.A.,MVSR Engineering College
Advances in Intelligent Systems and Computing | Year: 2015

A Mobile ad hoc network (MANET) is a collection of independent mobile nodes that are self organized and self configured. Routing in MANET is a critical issue due to mobility of node and openness of network, so an efficient routing protocol makes the MANET secure and reliable. UOSPR deals with the concept of anonymity, unlinkability and unobservability as well as uses BATMAN proactive routing in which every node has knowledge of best hop details instead of maintaining entire network topology. In UOSPR there is latency in data transmission if route is not found in the routing table at a particular time interval. We know that ad hoc network has limited battery power, but already half of the power used for security in USOR and UOSPR, remaining power has to be used efficiently for calculating routes and data transmission. For this purpose UOSHR is introduced by combining reactive (USOR) and Proactive (UOSPR) routing protocols. This technique eliminates latency in finding route, achieves fast and secure transmission of data. NS2 is used to implement and validate the effectiveness of the design. © 2015, Springer International Publishing Switzerland.

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