Complex Variable Method to Predict Aerodynamics of Arbitrary Shape Space Debris
Performance Analysis on the Effect of Different Electrolytes During Glass Micro Drilling Operation Using ECDM
Assessment of Impact of Bauxite Mining on Environment
Investigation of Mechanical Properties by Optimizing process Parameters of FSW for AZ31B Magnesium Alloy
Study of Transient Characteristics of Belt Conveyor by Lumped Mass Method
Multi - Objective Optimization of Process Parameters in Abrasive Water Jet Machining by using VIKOR
Effects of Chemical Reaction, Radiation and Aligned Magnetic Field on Unsteady MHD Casson Fluid Flow Past a Moving an Infinite Vertical Plate Through Porous Medium in Presence of Heat Absorption
Comparison of Process Parameter Optimization of a Jig Boring process using Taguchi Based Grey Analysis and Genetic Algorithm
Cloud Identification Method Using HOS Based ICA For Multispectral NOAA Image
Dynamic Changes in Mangrove Forest and Lu/Lc Variation Analysis over Indian Sundarban Delta in West Bengal (India) Using Multi-Temporal Satellite Data
The Impacts of Climate Change on Water Resources in Hilly Areas of Nepal
Assessing the Adequacy of Probability Distribution for Extreme Value Analysis of Rainfall and Temperature using Goodness-Of-Fit And Diagnostic Tests
Remote Sensing Based Approach on Recent Changes in Platform of River Ganga From Mirzapur to Ballia
An Analysis of Machining Forces On Graphite/Epoxy, Glass/Epoxy and Kevlar/Epoxy Composites Using a Neural Network Approach
Deformation Behaviour of Fe-0.8%C-1.0%Si-0.8%Cu Sintered P/M Steel during Powder Preform Forging
A Series of Tool-Life Studies on Aluminium Matrix Hybrid Composites
Achieving Manufacturing Excelence by Applying LSSF Model – A Lean Six Sigma Framework
Design and Analysis of Piezo- Driven Valve-Less Micropump
The objective of this research project is to develop a novel engineering technique to predict any aerodynamics of arbitrary shape space debris in the Earth's atmosphere produced during the collisional breakup. The linear size characteristics of the cross-section of arbitrary shape space debrisare determined by using a conform representation method. A model of superposition of the molecular and turbulent viscosities was used to describe the turbulent flow of air. Using a complex variable method “linearization of single-bonded area" a universal formula for velocity of arbitrary shape space debrisis derived. This technique allows describing the aerodynamics of the space debris of various shapes, sizes and masses in the Earth's atmosphere.
Electrochemical discharge machining (ECDM) is a proven technology for machining glass work materials with effective material removal rate. In the ECDM process, electrolyte selection plays a pivotal role in controlling the gas film stability and other machining features owing to their discrete electrochemical properties. This present article investigates the effect of three different electrolytes viz. NaOH, KOH, and NaCl on the removal rate of material by using Taguchi's L9 Orthogonal array design. Electrolyte type, its concentration, and applied voltage were chosen as process parameters. Response measurements were analyzed through the S/N ratio to obtain parametric optimization for maximum removal rate of material or Material Removal Rate (MRR) values. Results revealed that the electrolyte type is the most significant parameter influencing the removal rate of material with a percentage contribution of 60.83% followed by applied voltage and electrolyte concentration. The optimum values of parameters for maximum MRR are found to be A3B1C3 i.e., (50V, NaOH, 25 wt %).
Kolhapur district seems to be favorable place in regard to the availability of some of the important minerals. Manganese and Iron ores are found in the southern area of Kolhapur district. Another important mineral found in this district is bauxite. The present research paper deals with the assessment of possible environmental impacts due to the proposed bauxite mining in the area of Shahuwadi of Kolhapur district of Maharashtra. Exploitation of minerals from the earth surfaces through mining activities causes ecological and environmental instability. Impact Assessment Studies are used to quantify impacts of mining activities within the zone of impact. To prevent adverse impacts of mining, environmental management plan is prepared through the findings of Impact Assessment studies. Though mining initially provided employment opportunities for few inhabitants and generated some revenue to Government, it would last only for a small period. However, the damages caused to the regional biodiversity as a result of the changed land use would remain permanent.
In the present experimental work, the friction stir welding was performed on AZ31B magnesium alloy. Four process parameters selected for the optimization of were rotational speed, weld speed, plunge depth and tool shape. Taguchi method was used to design the set of experiment that were carried out for the optimization of welding. Aforementioned four parameters, at four level each and L16 orthogonal array was used. The response characteristics selected was ultimate tensile strength and Taguchi's larger is better approach was used for calculating signal to noise ratio. The experiments were carried out according the Taguchi design of experiment made in Minitab 17 Software. Using signal to noise ratio, the optimum level of each parameter was found. Signal to noise ratio indicate the most influencing parameter for optimum tensile strength was weld Speed followed by plunge Depth and rotational Speed. The tool Pin profile has the least effect on the response characteristics. The effect of all these parameters on the tensile strength was validated by the ANOVA. Further, the contribution of each parameter was found by using ANOVA.
Belt Conveyor system is most preferred and cost efficient bulk material handling system. Rubberized flat belt is the main and the costliest component of belt conveyor system. It greatly affects the overall performance of whole system. For large capacity and long distance conveyor, dynamic characteristics plays vital role. In this paper viscoelastic properties of belts are simplified as a series lump mass and their equation of motion is established by Lagrange approach. Inclined belt conveyor for fully loaded condition is studied as a five degree of freedom problem and its transient performance analyzed by simulating 2nd order differential equations with Simulink. Conveyor displacement, velocity, acceleration and dynamic tension during staring transient process reveals the nonlinear viscoelastic characteristics of conveyor belt. Staring pull is requiring being optimum in view of starting belt stresses and safety of drive motor. Output data helps to improve stability and lower down the factor of safety of belt conveyor system.
Abrasive water jet machining (AWJM) process is one of the unconventional machining processes used in many industrial applications. Abrasive water jet machining process withstand very high operating pressures and also the flow of abrasive particles are at very high water pressure is made to remove material from work surface by erosion process. In AWJM process pure water and abrasive particles such are Si02, beads of glass; aluminum oxide and silicon carbide are majorly used. In this work, optimization of process parameters on the material removal rate, kerf width and surface roughness of Al6082 are done by using AWJ machining process. The experiments were conducted according to Taguchi Experimental design using four factors each at three levels to determine the effect of output responses like material removal rate, surface roughness and kerf width. Finally, multi-criteria optimization and compromise solution (VIKOR) algorithm has been applied for multi-objective optimization of the responses of Electrical Discharge Machining (EDM) process on Al6082 alloy.
The present paper studies the effect of aligned magnetic field on an unsteady MHD free convection Casson fluid flow past an infinite plate through porous medium in the presence of thermal radiation and heat absorption. When t*>0, the velocity u*=u0, and that time, plate temperature and the concentration are raised to T*w and C*w and a first order chemical reaction takes place. A uniform magnetic field B0 is applied in y*-direction. The systems of non-dimensional governing linear partial differential equations are solved analytically by using the Laplace transform technique. The influences of various non-dimensional parameters on the velocity, the temperature, the concentration, the Sherwood numbers, the local Nusselt and the skin friction have been discussed and analyzed through graphs and tables.
In the present work few process parameters of a Jig Boring machine like 'Feed Rate', 'Depth of Cut' and 'Cutting Speed' have been optimized for best possible values of few performance parameters or target parameters like 'Vertical Reaction Force', 'Surface Roughness' and 'Material Removal Rate' for a Mild Steel work specimen. The grade of the steel used in the specimen is AISI 1040. Though optimization of process parameters of a Jig Boring machine has been done by many researchers or engineers previously, in the present work a mathematical model has been formulated by regression analysis from the experimental data created as per Taguchi method. Next, from the experimental data, Grey Relational Analysis has been done to predict the optimum combination of process parameters for the best result of performance parameters. Lastly, to validate the mathematical model which has been derived by regression analysis, optimization of the process parameters have been done using Genetic Algorithm optimization tool of MATLAB Program and the optimum result of the process parameters have been verified with the optimum result determined by Grey Relational Analysis.