Volume 3, Issue 3 (2016)
Published
Table of contents
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Influence of Internal and External Dampings on Shaft Whirl Speeds
Abstract: A mathematical model is developed for the estimation of rotor forward and backward whirl speeds by considering the stationary and rotational dampings. Stationary damping includes external viscous damping in the bearings and rotational damping includes internal viscous and hysteretic damping in the shaft material. The rotors in gas turbines and steam turbines commonly used in military and commercial rotating machines operate at high speeds. These rotors are provided with a …
Published in Trends in Machine design · Vol. 3, Issue 3, 2016 · pp. 1–11 Read article
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Six Sigma DMAIC Approach for Increasing Effectiveness of Heat Exchanger
Abstract: In a small sized furnace manufacturing company, heat exchanger is a fundamental segment. The productivity of the furnace relies on upon the proficiency and adequacy of the heat exchanger. This research uncovers the experimental execution of Six Sigma DMAIC (DefineMeasure-Analyze-Improve-Control) stages to enhance the adequacy of shell and tube heat exchanger and along these lines enhance the quality and productivity of the furnace. The basic goal is to enhance the …
Published in Trends in Machine design · Vol. 3, Issue 3, 2016 · pp. 12–17 Read article
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Finite Element Analysis of Tool Wear Rate in Electrical Discharge Machining and Comparison with Experimental Results
Abstract: Electrical discharge machining (EDM) is one of the precise non-traditional machining processes in which desired shape is obtained in workpiece using electrical sparks. In EDM, material removal from workpiece and tool takes place by means of successive sparks occurring between them. The tool wear is a critical problem in EDM as the change in tool shape directly affects the final shape of the workpiece. In this paper, finite element analysis …
Published in Trends in Machine design · Vol. 3, Issue 3, 2016 · pp. 18–22 Read article
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Stress Analysis of Variable Thickness FGM Rotating Disks by Element based Material Gradation under Thermomechanical Loading
Abstract: The present research work aims to analyze deformation and stresses, induced in functionally graded rotating disks of variable thicknesses. The disks are made of exponential functionally graded material, whose mechanical and physical properties vary in radial direction. Functionally gradation of the properties is achieved by element-based gradation. Uniform as well as variable thickness, namely concave profile, convex profile and linear varying profile rotating disks are analyzed for clamped-free and free-free …
Published in Trends in Machine design · Vol. 3, Issue 3, 2016 · pp. 32–42 Read article
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Failure Analysis of Bearing: A Review
Abstract: Ball and rolling element bearings are perhaps the most widely used components in industrial machinery. They are used to support load and allow relative motion inherent in the mechanisms involved, preventive measures and recommended corrections to enhance the life of the bearing. In this paper, the most widely referred mechanisms are reviewed and discussed, and their limitations are addressed. Heat flows within a bearing, scanning electron microscope (SEM), Fourier infrared …
Published in Trends in Machine design · Vol. 3, Issue 3, 2016 · pp. 43–59 Read article