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Imran M.,MJCET | Sayeed Ahmed G.M.,Alagappa Chettiar College of Engineering And Technology
Materials Today: Proceedings | Year: 2015

This Research paper studies about the designing and simulation aspects of automatic arc welding system using digital control with the help of Proteus Simulation software. The welding sequence considered for the study consists of five intervals they are Standby, Squeeze, Weld, Hold, and Release intervals. A separate stepping interval circuit with a decoder to step the intervals from one to another is designed and analysis is done using a decoding technique. The designed stepping circuit ensures the correct order of the five intervals of the welding system, also a separate stepping of heat-cool sub intervals of weld interval is also designed with a user defined preset time counter circuit so that welding interval can be timed based on the user defined priority and can also be stepped between the two heat and cool sub intervals based on the total time assigned by the user. The digital automatic control system is developed to accurately control the arc welding system for welding of two given metal pieces. This report concerns automatic welding system with digital control and is directed to the improvement of certain drive and guide means for a relatively freely carried welding of wheel rim and wheel spider for continuous welding of a part resting on a freely rotatable table. The drive and guide means are carried on the welding head and impart drive to the part while maintaining the welding head properly positioned relative to the part. The system presented is a slightly simplified version of a real automobile wheel-welding system. Although system operation is explained in terms of wheel welding, the design of the system has much in common with other welding operations utilizing the basic industrial automatic welding sequence of Squeeze, Weld, Hold, Release, and Standby with digital control. © 2015 Elsevier Ltd.

Yarlagadda V.,VNR VJIET | Sankar Ram B.V.,JNTUH College of Engineering | Rao K.R.M.,MJCET
Communications in Computer and Information Science | Year: 2013

The design, Fabrication of 4-Kvar 3-phase fixed capacitor-thyristor controlled reactor (FC-TCR) type SVC has been developed in the laboratory for a Single Machine Single Bus (SMSB) Test System. The test system is setup in the laboratory to evaluate the FC-TCR type SVC in stabilizing bus voltage. It comprises of a 3-phase Synchronous Machine of 5kva capacity and a 3-phase squirrel cage Induction Motor of 5HP Rating. 3-Ph SVC have been designed and fabricated and tested by connecting it to a SMSB Test System and experimental results have been presented in this paper. The Power - Voltage (P-V) and Power - Load angle (P-δ) Curves of the SMSB Test system with and without SVC have been plotted which shows the effectiveness of SVC on Generator and Voltage Stability enhancement. © 2013 Springer-Verlag.

Qadeer S.,MJCET | Ali Khan M.Z.,IITH
2011 International Conference on Multimedia, Signal Processing and Communication Technologies, IMPACT 2011 | Year: 2011

In this paper the analysis of overall quantization loss for the Radix-4 and Radix-8 Fast Fourier Transform (FFT) algorithms is extended to the case where the twiddle factor word length is different from the register word length. Simulation results, that validate the theoretical analysis, are then presented. © 2011 IEEE.

Asrar Ahmed M.,MJCET | Khan K.U.R.,ACEEC
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

The Integration of MANETs and infrastructure networks such as Internet, extends network coverage and increases the application domain of MANET. Several strategies exist for integration of two networks. Most of them presume that a non-adversarial environment prevails in the network. However such an ideal scenario is not always guaranteed. Nodes many behave maliciously due to scarcity of resources, congestion, or malicious intentions. In this paper a trust based, load aware, and secure gateway discovery for IIM is proposed. It employs the concept of mutual trust and authentication among nodes to prevent malicious activities. However a notable exception is that a node may experience packet-drop due to congestion on route or overflow in the interface queue of an intermediate node; this is not a malicious behaviour. In order to avoid such false malicious behaviours, we employ an effective and adaptive load balancing scheme to avoid congested routes. Thus it would be a novel strategy that ensures the routing in the Integrated Internet and MANET to be trustworthy, secure, efficient, and robust. © 2013 Springer-Verlag Berlin Heidelberg.

Yarlagadda V.,VNR VJIET | Rao K.R.M.,MJCET | Sankar Ram B.V.,JNTUH College of Engineering
Lecture Notes in Electrical Engineering | Year: 2013

The Thyristor Controlled Series Compensator (TCSC) and Static Var Compensator (SVC) are variable impedance Flexible AC Transmission Systems (FACTS) Controllers. A combination of the TCSC and the SVC installation is proposed to acquire superior performance for the power system. The coordination between the two pieces of equipment is designed with the SVC treated as the supplement of the TCSC. When operation of the TCSC is constrained by the inherent limitation of equipment, such as due to the firing-angle limitation of the thyristors, the adjustable SVC can supply the auxiliary support to improve the overall performance. The voltage and angle stability margins can be greatly improved with the compatible control schemes of the TCSC and the SVC. © 2013 Springer Science+Business Media New York.

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