Informatics Publishing Limited

A. Prashanth ¹, R. Paramesh Waran ¹, Sucheta Khandekar ², Sarika Pawar ²

Affiliations
1 School of Computing, Sastra University, Thanjavur - 613401, Tamil Nadu, IN
2 Department of Electrical Engineering, JEC, Jabalpur - 482011, Madhya Pradesh, IN

Abstract

Adder is a circuit that is combinational andcalculates the sum of three (full adder) or two (half adder) inputs. Full adder can be cascaded to produce n-stages of adder. This cascaded adder structure is called as parallel adder. The sum and carry outputs of any stage cannot be calculated until the input carry occurs, this leads to a delay in the addition process. In order to overcome the delay, carry look ahead adder is proposed which is said to be a fast adder. To improve the speed of vary look ahead adder, Spurious Power Suppression Technique (SPST) is used. This paper discusses 8-bit adder consisting of three architectures parallel adder, normal carry look ahead adder and SPST carry look ahead adder. The results were simulated using Xilinx tools and as shown, the power has decreased for both the SPST carry look ahead adder and the SPST ripple carry adder. The code was written in Verilog HDL and tested on a Xilinx FPGA test board as a part of a velocity measurement circuit for an Electromagnetic Projectile Launcher.

Keywords

Adder, Full Adder, Power, Parallel Adder, SPST.

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A. Prashanth ¹, K. Elangovan ², S. A. Rodriguez Arthurs ²

Affiliations
1 Mechanical Engineering, CiTech, Bangalore, IN
2 CiTech, Bangalore, IN

Abstract

Stresses are the prime source for the fatigue life diminution. In order to increase the fatigue life of the welded module, the residual stresses has to be minimized and this can be primed by choosing appropriate material in fabrication of the part and by adopting suitable welding process. There is another possibility to reduce the induced residual stress and thereby increasing the component life under fatigue loading, is by the application of post weld treatments. In the class of mechanical post weld treatments, Ultrasonic Impact Treatment is relatively new post weld treatment method. Ultrasonic Impact Treatment (UIT) imparts the energy generated from high frequency impulses into treated surface through specially designed strikers leading to the plastic deformation of surface layers. The technique is also recommended due to its high process stability and low operating costs. Modest initial loads are used in UIT to produce deep penetration work hardening of minor surface roughness. This technique accordingly opens up applications that are impossible to achieve using conventional work hardening technique.

Keywords

Ultrasonic Impact Treatment (UIT), Welding, Fatigue, Residual Stress.

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