#IJSRD Optimization of Machining Parameters in CNC Turning Using Firefly Algorithm

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Optimization of Machining Parameters in CNC Turning Using Firefly Algorithm

Abstract— now a day’s machining is done through various automated machines. One of the widely used machines is CNC. Even though the automated machines are used, the quality of the work is determined by parameters used. The cutting parameters of the CNC machine determine the productivity, surface finish, machining time and other qualities of the product. This study involves the optimization of those cutting parameters. In order to get optimized CNC parameters for a specific tool-work combination, Firefly Algorithm (FA) is used to compute the best parameters based on the experiments conducted on a CNC Turning center. The three cutting parameters are cutting speed (V), feed (f), and depth of cut (d). The practical constraints have been considered during both practical and experimental approaches.  The result reveals that FA is very well suited in solving parameters selection problems. 

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#Ijsrd : Influence of Metal Temperature on Strength of Rolled Steel Product

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Influence of Metal Temperature on Strength of Rolled Steel Product

Abstract—Rolling is extensively used metal forming process. Almost 90% of cast iron or steel products pass through rolling process at least once in its life cycle. Rolling products are most extensively used in daily life. Use of these products can be seen in bridges, towers, leaf springs, boilers, constructional structural parts and also in daily life products like knives pipes etc. In today’s era, quality of products is one of most important factor considered for its use. Quality of a product can either be controlled or improved by changing in composition or by using heat treatment processes.  In rolling products composition is not only the factor which improve the quality of product but temperature plays a vital role in maintaining and improving quality. By changing temperature of rolling we can change grain structure and its mechanical properties without changing its composition.

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#Ijsrd Performance of Multiple symbol representation with clipping scheme for PAPR reduction in OFDM systems

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Performance of Multiple symbol representation with clipping scheme for PAPR reduction in OFDM systems

Abstract :

OFDM is one of the multicarrier modulation technique used in various communication systems. The major problem one faces while implementing this system is the high peak to average power .For an efficient OFDM system this PAPR should be low. In this paper a hybrid PAPR (peak to average power ratio) reduction technique for the OFDM (orthogonal frequency division multiplexing) signal which combines a multiple symbol representations method with a signal clipping method is proposed. In multiple symbol representations alternative signaling points are used to represent one symbol and PAPR is further reduced with the clipping scheme. The performance of the hybrid scheme is compared with the partial transmit sequence which is one of the other PAPR reduction scheme. In partial transmit sequence the input data is divided in to disjoint blocks transformed in to time domain sequence and rotated by phase factors. Theoretical analysis and simulation results validate that the proposed scheme has the ability to provide large PAPR reduction, low bit error rate. Performance analysis is also done with the partial transmit sequence scheme.

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