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Online modeling and monitoring of power consumption, aerosol emissions and surface roughness in wire cut electric discharge machining of Ti-6Al-4V
No full textEstimation of energy consumption in machining plays an irreplaceable role in monitoring and improving energy efciency
with reduced emission and surface roughness. This paper proposed a novel data-based grey online modeling and monitoring system for the power consumption, aerosol emissions, and surface roughness in wire cut electrical discharge machining of Ti-6Al-4 V using the grey theory GM(1,N). The proposed methodology needs a very less number of data samples for modeling and monitoring with no training time. Amplitude of wire vibration in X- and Y-directions and absolute diference of wire amplitude in data series are inputs for the grey online modeling and monitoring system. The root mean square error for diferent parameter settings is estimated and identifed as an optimum combination of parameters. The combination of
amplitude of wire vibration in X-direction and absolute diference of wire amplitude in X- and Y-directions is signifcant in
estimation of power consumption (root mean square error is 0.81) as well as aerosol emissions (root mean square error is
0.75), and the combination of amplitude of wire vibration in Y-direction and absolute diference of wire amplitude in X- and
Y-directions is signifcant in estimation of surface roughness (root mean square error is 0.41). An artifcial neural network is
also developed and trained with a feedforward backpropagation algorithm that predicted the power consumption, emissions,
and surface roughness. A comparison between the grey online modeling and monitoring system and the system developed
by the neural network found that grey online modeling and monitoring showed better performance with less training model
Numerical Study on Natural Convection of Alumina-water Nanofluid in a Square Cavity with Two Localized Heat Sources on Adjacent Surfaces
No full textIn the present work, results of a numerical study carried out using finite volume method, to investigate the fluid flow and heat transfer characteristics of Alumina ( Al2O3 ) nanoparticles in the base fluid (water) in a square cavity under natural convection mode are presented. The Semi Implicit Method for Pressure Linked Equations (SIMPLE) algorithm was used to solve the discretized momentum and energy equations. Constant temperature heat sources of same strength are placed on bottom and left vertical surfaces whereas the right surface was kept cold, while the top surface was maintained as adiabatic. The impact of Rayleigh number (RaN) ( 1000 to 106 ) and nanoparticles volume fraction (Φ = 0 %, 5 %, 10 %, 15 % and 20 %) on fluid and heat flow characteristics were numerically
investigated and presented in the form of streamlines, isothermal lines, mid line horizontal and vertical velocity components, local Nusselt number ( Nuloc ) and average Nusselt number ( Nuavg ). The obtained results indicate, for lower RaN ( i.e; 103 ), conduction dominates over convection near heated surfaces and results in lower fluid velocities and poor heat transfer. For higher values of RaN ( RaN = 105 and 106 ) and volume fraction of nanoparticles, there was a significant increase in mid horizontal and vertical velocity components, Nuloc and Nuavg due to increase in convective heat transfer and thermal conductivity of nanoflui
A study of uncoated and coated nickel-zinc ferrite nanoparticles for magnetic hyperthermia
No full textThe paper describes how to arrive at the required characteristics suitable for the study of magnetic hyperthermia in a nanoferrite. The composition selected for the study, Ni0.60Zn0.35Fe2.05O4 was synthesized by sol-gel process with an adequate control on its particle size using a chelating agent, polyethylene glycol (PEG). Nanoparticles with mean particle sizes in the range 3.6–8.2 nm were obtained by annealing the as-prepared powder at different temperatures. Identification of single phase spinel structure, particle size determination and magnetic properties
of all the samples were made available with X-ray diffraction, Transmission electron microscopy, and Vibration sample magnetometer. The single domain nature of the nanoparticles was established from the particle size dependence of the coercivity. The superparamagnetic behaviour of two annealed samples having a mean particle sizes 3.6 nm and 4.4 nm was established from the temperature dependence of the field cooling and zero field ooling magnetization curves. The observed higher blocking temperature (below room temperature) for smaller particles was attributed to interactions between the particles in the powder samples. The effect of interparticle interactions on heating efficiency was examined by comparing the specific absorption rate (SAR) of nanoparticles
dispersed in water at different concentrations. The higher zeta potential values of citric acid coated nanoparticle
Enhanced Sequestration of Synozol ds Red onto Treated Turbinria Vulgaris from Waste Water: Statistical Optimization
No full textIn the present study, removal of synozol ds red dye from waste water using treated Turbinaria vulgaris (T. vulgaris) was investigated. The biosorbent morphology, functional groups presence before biosorption and shifting of groups after the biosorption were analyzed by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR). Response Surface Methodology (RSM) was used for the optimization of the selected parameters like pH (3–8), initial dye (20–100 mg L−1) and biosorbent dosage (0.1–0.5 g). The variables, impact on the removal of synozol ds red was analyzed from 3D graphs. The findings were well suited by Langmuir isotherm and pseudo-second-order models and the maximum biosorbent coverage was 30.3 mg g−1. Intraparticle and liquid film diffusion were rate limiting steps in the removal of synozol ds red. Therefore, treated T.vulgaris could be utilized as potential biosorbent for elimination of coloring agents from textile industrial effluents
Physicochemical, nutritional, bioactive compounds and fatty acid profiling of Pumpkin flower (Cucurbita maxima), as a potential functional food
Get PDFThe edible flowers and its several products gaining its importance as functional food. Pumpkin flower mainly consumed in India and Mexico but due to lack of scientific research there is a neophobia among people. The objective of the paper is to analyse the physicochemical, biochemical properties, proximate analysis, antioxidant activities, anthocyanin content and fatty acid profiling. The fresh pumpkin flower was having an average moisture content of 85% (wb) with a dimension of 90 × 51 x 22 mm (l x w x t). The (L, a*, b*) value signifies the bright yellow color having gumminess (26 g) and chewiness (4.70 mJ). In this study the nutritional properties of the pumpkin flower were also determined and significant amount of Sodium (11.5 mg/100 g), Potassium (18.2 mg/100 g), Calcium (17.6 mg/100 g), phenol (17.39 µg/ml), flavonoid (17.13 µg/ml), antioxidant (51.65%DPPH) and anthocyanin (10.3 mg/100 g) was present. Among several fatty acids’ oleic acid (21%), myristic acid (15.99%) and stearic acid (15.19%) was maximum. The presence of several phytonutrients and fatty acids makes pumpkin flower a potential source of functional food in near future
Effect of Tuck and Miss Stitch on the Geometrical Properties of Regenerated Cellulose Plain and Derivative Knit Structures
Get PDFThis study aimed to analyze the effect of tuck and miss stitch structures of regenerated cel- lulose fabrics like viscose, modal, Tencel, and bamboo. The fabrics were developed with the same stitch length and tightness factor and analyzed for their geometrical properties after dry and wet relaxation. The study results revealed that wet relaxation treatment showed more significant changes in the geometrical constant values (K) than the dry relaxation process. The highest wale density change was noted with cross miss stitch fabric and a maximum course density change noted for cross tuck samples after dry and wet relaxation. The differences in wale and course density were noted as statistically insignificant for the aforementioned struc- ture after dry and wet relaxation (p > 0.05). However, in the case of stitch density, there is a statistical significance noted for the tested samples (p 0.05)
Investigation on the lubricating behavior of cashew nut shell liquid oil as a renewable and reliable petrochemical product
Get PDFIn order to compact the ecological and harmful concerns of lubricants, it is necessary to focus on the environment-friendly oils as lubricants and manufacturing. Aforementioned studies reveal the significance of Cashew Nut Shell Liquid oil as renewable, biodegradable and non-toxic to the environment, hence the current study sought to explore the lubrication property of Cashew Nut Shell Liquid oil (CNSL) in comparison with base lubricant oil (SAE 20 W-40). In order to improve the lubrication in internal combustion engines, the study is conducted with various blends and the properties are evaluated as per ASTM standards. We believe ours is the first report to study the lubricating behavior of cashew nut shell liquid oil before and after pyrolysis process. Our study focuses on testing the CNSL oil according to the ASTM test standard and proposing the optimized blend for improving lubrication in IC engine by 8
Experimental Investigation on the Effect Due to Mould Vibrations on Mechanical and Metallurgical Properties of Aluminum Alloy (A-1050)
Get PDFIn the current research work performed, the consequences caused in the casting aluminum alloy specimen due to mechanical mould vibrations are examined. Mould vibration throughout the casting provides decreased rate of shrinkage, good morphology, surface finish and lesser probability of hot tear. In this research work, the effect of mould vibration during solidification of Aluminum A-1050 alloysfor dissimilar values of wavelengths at a permanent pouring temperature has been investigated to understand the modification in microstructure and mechanical properties after casting. The Al A-1050 casting has been made in a metal mould with different vibrations. The frequencies are varied from 15Hz to 50 Hz during the casting process. A casting has been made with different vibration as well to compare the results of castings with vibration frequencies. The experimental outcomes exhibited substantial grain refinement and significant increase in tensile strength and hardness of the castings with mechanical mould vibration during the duration and after solidification
Elastic behavior control of smart material integrated shallow spherical composite panel using HOSDT kinematics, Composite structures
No full textThis work aims to the large bending behaviour of shallow spherical composite reinforced with piezoelectric fibre. This piezocomposite has been modelled by incorporating the Green‐Lagrange type of strain in association with the higher‐order shear deformation theory, where the displacement field and electric potential field is taken in the function of cubic order and quadratic order of thickness coordinate respectively. The governing equation has been solved using nonlinear finite element method. The large amplitude responses have been
obtained by employing the minimum potential energy principle and direct iterative method. The computed responses have been validated with the numerical results available in the existing literature. The actuating ability of the piezoelectric composite panel in order to supress the large amplitude bending responses has been studied using proposed higher order nonlinear mathematical model. Various coupled electromechanical
numerical problems have also been solved in order to understand the linear/nonlinear elastic behaviour of
spherical piezocomposite panel with the detailed explanation on the actuation response due to the variation in the different geometrical parameter
Customer Satisfaction Post Car-Sales in Service Centers Using Experiential Marketing
No full textCustomer satisfaction is seen as an index to find the emotional state of a customer that defines the positive aspirations
to define the joy of a customer. The marketers focus mainly on making their customers happy, however, the marketing
or servicing tactics or campaigns cannot do this but a positive experience of a user with emotional bonding can do this.
Hence, with such motivation, the present study finds how well the customers are happy post sales of a car or servicing
of a car. This study finds the customer experiences on how their vehicles are serviced and this defines the measure of
satisfaction and customer loyalty. The study conducts a questionnaire survey on 1000 patients at different service center
executives and car owners. The analysis is conducted using SPSS tool to find the positive experience and its significant
impact on satisfaction and customer loyalt