Investigation of cutting parameters of surface roughness for a non-ferrous material using artificial neural network in CNC turning
January 2011
Surface roughness, an indicator of surface quality is one of the most specified customer requirements in a machining process. For efficient use of machine tools, optimum cutting parameters (speed, feed and depth of cut) are required. So it is necessary to find a suitable optimization method which can find optimum values of cutting parameters for minimizing surface roughness. The turning process parameter...
Behavior of a radio channel in the WLL (Wireless Local Loop)
December 2010
The local loop can be of two kinds, the local loop with copper wires and the local loop that use radio technology. Under certain conditions, the wireless Local Loop (WLL) can be an alternative more interesting than the copper local loop. We study in this paper the behavior of a radio channel and the multipath effect in a WLL transmission. Key words: Wireless Local Loop (WLL), radio...
Non-axisymmetric dynamic response of imperfectly bonded buried fluid-filled orthotropic thin cylindrical shell due to incident compressional wave
December 2010
The main aim of this paper is to assess and compare the relative importance of the effects of considering the fluid presence and the bond imperfection while evaluating the non-axisymmetric dynamic response of an imperfectly bonded empty as well as fluid filled orthotropic thin cylindrical shell buried under soil and excited by compressional wave (P-wave). While applying thin shell theory, the effect of shear...
The need for the incorporation of boundary condition prediction in real life layups using Drape simulation software tool
December 2010
The focus on the contour sensitive part mating boundary conditions development, using software in the fabric deformation during the hand layup and automation of press-forming process is important in the development of composite materials. During the real life layup production processes, the fabric directional changes produced wrinkles and voids in the part produced. This directional changes are not really...
Prediction of stress concentration effect under thermal and dynamic loads in a high pressure turbine rotor
November 2010
Geometric discontinuities cause a large variation of stress and produce a significant increase in stress. The high stress due to the variation of geometry is called as ‘stress concentration’. This will increase when the loads are further applied. There are many investigators who studied the stress distribution around the notches, grooves, and other irregularities of various machine...
Vehicle gearbox fault diagnosis using noise measurements
November 2010
Noise measurement is one of the technologies for health monitoring and diagnosis of rotating machines such as gearboxes. Although, significant research has been undertaken in understanding the potential of noise measurement in monitoring gearboxes, this has been solely applied on any types of gears (spur, helical, etc.). The condition monitoring of a lab-scale, single stage, gearbox, represents the real...
Hot deformation behavior of Nb-V microalloyed steel
October 2010
n this research, hot deformation behavior of Nb-V microalloyed steel has been investigated by conducting hot compression tests at temperatures of 900-1100°C and under constant strain rates, ranging from 0.01 to 1s-1. The stress-strain curves showed that dynamic recrystallization is responsible for flow softening at steady temperatures and strain rates. The relations between peak...
Investigation to improve hunting stability of railway carriage using semi-active longitudinal primary stiffness suspension
October 2010
Railway carriage model moving on tangent tracks is constructed by deriving the associated equations of motion where single-point and two-point wheel-rail contact is considered. The railway carriage is modeled by 31 degrees of freedom which govern vertical displacement, lateral displacement, roll angle and yaw angle of wheelset whereas vertical displacement, lateral displacement, roll angle, pitch angle and...
Effect of relaxation times and rotation on the propagation of plane waves in generalized magneto-thermo-viscoelasticity
October 2010
The problem of wave propagation in the generalized dynamical theory of thermo-elasticity proposed by Green and Lindsay is applied to study the propagation of harmonically time dependent thermo-visco-elastic plane waves of assigned frequency in an infinite visco-elastic solid in a magnetic field. A more general dispersion equation is deduced to determine the effects of rotation, viscoelasticity and relaxation...
A new experimental technique to determine heat transfer coefficient and pressure drop in smooth and micro-fin tube
September 2010
An experimental test facility is designed and built to calculate condensation heat transfer coefficients and pressure drops for HFC-134a in a 10.21 mm ID smooth and 8.56 mm ID micro-fin tube. The main objective of the experimentation is to investigate the enhancement in condensation heat transfer coefficient and increase in pressure drop using micro-fin tube for different condensing temperatures and further...
Calibrating the multiple orifice mathematical model using physical scale model foam at low Reynolds number
September 2010
Recently, gelcast ceramic foams are being considered as potential diesel particulate filter substrates. Consequently, a mathematical model known as the Multiple Orifice Mathematical (MOM) model for the study of fluid flow and the determination of pressure gradients across the foam filters was developed and calibrated by some researchers. However, there was need to establish the model application on a wider...
Reliability prediction of control valves through mechanistic models
August 2010
A Nuclear Power Plant (NPP) consists of normally operating and emergency standby systems and components. The failure of any operating component will lead to a change in the state of the plant. Control of the processes in the plant is an essential part of the plant operation. The most common control element in the process control systems is the control valve. The control valve manipulates a...
The design and development of G-code checker and cutting simulator for CNC turning operation
August 2010
CNC machines have been becoming popular in manufacturing sector for the last fourdecades. It still costs a lot of money to afford some aspects related to the operations of these machines, such as the hardware, the software and the brainware. One important aspect is the programming stage where this activity requires a skillful programmer and an appropriate programming media. To...
Integrated neural networks approach in CAD/CAM environment for automated machine tools selection
March 2010
This paper proposed a new model for integrating neural networks approach in the task of generating process planning for machining features. The main issue of process planning addressed in this paper is the optimization of machine tools selection for mechanical part containing simple and interacting features. First, this proposed method elaborated a knowledge database from the investigation with expert in...
Geometrically nonlinear transient analysis of functionally graded shell panels using a higher-order finite element formulation
March 2010
Nonlinear transient analysis of functionally graded curved panels is carried out employing a higher-order C0 finite element formulation. The element consists of nine degrees-of-freedom per node with higher-order terms in the Taylor’s series expansion which represents the higher-order transverse cross sectional deformation modes. The formulation includes Sanders’ approximation for doubly...
Fractography of compression failed carbon fiber reinforced plastic composite laminates
February 2010
Widespread usage of composites in the advanced technologies, has led to the study of the failure modes by which these composites fail, as identification and hence the interpretation of these characteristic fracture features is necessary to provide valuable information in understanding of the failure behavior of composites. Hence, in this paper, our effort has been in the study of the fractographic features in the carbon...
Wind data analysis of Silchar (Assam, India) by Rayleigh’s and Weibull methods
February 2010
In this study, wind energy potential of Silchar, the Southern part of Assam, India was analyzed for the period of five years from 2003 - 2007. The wind velocity was recorded diurnally, which was averaged over 24 h in a day. The sampling was done after every 3 h. Diurnal wind speed variation shows the actual picture of wind regime of a place. The average wind velocity in Silchar is about 3.11 kmph, which is...
Functional parameters modelling of transformer
November 2009
This paper analyses transformer loss of life, attending to the realistic variability of both structural and functional parameters. The article begins with the modelling of load and ambient temperature profiles by means of chronological series theory. A simple additive model is proposed and validated with realistic data. Loss of life resulting from probabilistic functional and structural parameters is analysed...
Study of roller burnishing process on En-8 specimens using design of experiments
September 2009
Roller burnishing process is a superior cold forming finishing process. It is done on machine or ground surfaces for both external and internal surfaces. In this process, a smooth, hard object (under considerable pressure) rubs over the minute surface irregularities that are produced during machining or shearing. The hardened rolls of the tool press against the surface and deform the protrusions to a more...
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