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Optimizing machining parameters of wire-EDM process to cut Al7075/SiCp composites using an integrated statistical approach

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Advances in Manufacturing 2016年第3期4卷 202-216页

作者： Thella babu Rao Department of Mechanical Engineering K L UniversityGreen Fields Vaddeswaram GunturAndhra Pradesh 522502 India

Metal matrix composites （MMCs） as advanced materials, while producing the components with high dimensional accuracy and intricate shapes, are more complex and cost effective for machining than conventional alloys. It is due to the presence of discontinuously distributed hard ceramic with the MMCs and involvement of a large number of machining control variables. However, determination of optimal machining conditions helps the process engineer to make the process efficient and effec- tive. In the present investigation a novel hybrid multi-response optimization approach is proposed to derive the economic machining conditions for MMCs. This hybrid approach integrates the concepts of grey relational analysis （GRA）, principal component analysis （PCA） and Taguchi method （TM） to derive the optimal machining conditions. The machining experiments are planned to machine A17075/SiCp MMCs using wire-electrical discharge machining （WEDM） process. SiC particulate size and its weight percentage are explicitly considered here as the process variables along with the WEDM input variables. The derived optimal process responses are confirmed by the experimental validation tests and the results show satisfactory. The practical possibility of the derived optimal machining conditions is also analyzed and presented using scanning electron microscope （SEM） examinations. According to the growing industrial need of making high performance, low cost components, this investigation provides a simple and sequential approach to enhance the WEDM performance while machining MMCs.

关键词： Al7075/SiCP metal matrix composites(MMCs) Wire-electrical discharge machining (WEDM)Principal component analysis (PCA) Grey relationalanalysis (GRA) Taguchi method (TM)

Synthesis of high-performance nickel hydroxide nanosheets/gadolinium doped-α-MnO_(2) composite nanorods as cathode and Fe_(3)O_(4)/GO nanospheres as anode for an all-solid-state asymmetric supercapacitor

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Journal of Energy Chemistry 2022年第1期31卷 475-484,I0013页

作者： Milan babu Poudel Han Joo Kim Department of Convergence Engineering Technology Jeonbuk National UniversityJeonju Jeollabuk-do 54896Republic of Korea

The wide use of manganese dioxide(MnO_(2))as an electrode in all-solid-state asymmetric supercapacitors(ASCs)remains challenging because of its low electrical *** complication can be circumvented by introducing trivalent gadolinium(Gd)ions into the MnO_(2).Herein,we describe the successful hydrothermal synthesis of crystalline Gd-doped MnO_(2) nanorods with Ni(OH)_(2) nanosheets as cathode,which we combined with Fe_(3)O_(4)/GO nanospheres as anode for all-solid-state *** tests dem on strate that Gd dopi ng sign ifica ntly affected the electrochemical activities of the MnO_(2),which was further enhanced by introducing Ni(OH)_(2).The GdMnO_(2)/Ni(OH)_(2) electrode offers sufficient surface electrochemical activity and exhibits excellent specific capacity of 121.8 mA h g^(-1),at 1A g^(-1),appealing rate performance,and ultralong lifetime stability(99.3%retention after 10,000 discharge tests).Furthermore,the GdMnO_(2)/Ni(OH)_(2)//PVA/KOH//Fe_(3)O_(4)/GO solid-state ASC device offers an impressive specific energy density(60.25 W h kg^(-1))at a high power density(2332 W kg^(-1)).This investigation thus shows its large potential in developing novel approaches to energy storage devices.

关键词： Solid-state supercapacitor Manganese dioxide Gadolinium doping Nickel hydroxide nanosheets

Experimental Behavior of Recycled Aggregate Concrete Filled Steel Tubular Columns

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Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1414-1417页

作者： Thirumalai R Suresh babu S Research Scholar-Full Time Dept.of Civil EngineeringKongu Engineering College PerunduraiErode 638060TamilnaduIndia Dept.of Civil Engineering Kongu Engineering College PerunduraiErode 638060TamilnaduIndia

During the modernization or rehabilitation activity,the demolished structural waste causes large soil pollution and unavailability of natural aggregate is the big concern for the construction ***,this manuscript deals with the Composite Steel Circular Column(CSCC)with Recycled Aggregate concrete(RAC)as infill is partly used,with the replacement of 25%and 50%in M30 grade of *** internal reinforcement steel is fully replaced by rolled steel tubes(circular and square)with varied thickness,ISA-unequal *** 14 specimens are cast and examined under axial load for analysis of the deflection characteristics,the load-bearing capacity along with its buckling *** experimental values are estimated through LVDT(linear variable differential transducer)at *** curve of load-deflection is drawn with the load *** the date interpretation,it is found column made of 50%-RAC has more than 25%-RAC.

关键词： composite steel circular column(CSCC) recycled aggregate concrete(RAC) ISAinternational standard angle LVDT(linear variable differential transducer)

Performance and Emission Characteristics of a CRDI Diesel Engine Fuelled by SiO_(2) Nanoparticle-Waste Fat Biodiesel Blends

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 56-66页

作者： babu Aurtherson P Dinesh babu Munuswamy Ravikumar Jayabal Yuvarajan Devarajan Department of Mechanical Engineering Mahat Amma Institute of Engineering and TechnologyPudukkottaiTamil NaduIndia Department of Mechanical Engineering Rajalakshmi Institute of TechnologyChennaiTamil NaduIndia Department of Thermal Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennaiTamil NaduIndia

This study investigates the use of waste fat biodiesel(WFB)from the leather industry as a substitute for diesel ***,it examines the diesel engine performance of WFB,a blend of WFB and diesel(B50),and different blends of WFB and silicon dioxide(SiO_(2))nanoparticles(B50SiO_(2)40,B50SiO_(2)80,and B50SiO_(2)120μg/g).The results indicate that the B50SiO_(2)120 blend increases brake thermal efficiency by 10.03%compared to pure biodiesel but falls 1.93%short of neat ***,the B50SiO_(2)120 mixture reduces smoke,hydrocarbon,and carbon monoxide emissions by 31.87%,34.14%,and 43.97%respectively,compared to ***,the B50SiO_(2)120 blend shows a 4.91%increase in nitrogen oxide emissions compared to diesel.

关键词： waste fat transesterification biodiesel silicon dioxide emission

Elastic and Optoelectronic Properties of KCdF3:ab initio Calculations through LDA/GGA/TB-mBJ within FP-LAPW Method

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Chinese Physics Letters 2015年第1期32卷 108-112页

作者： K. Ephraim babu N. Murali K. Vijaya babu B. Kishore babu V. Veeraiah Modelling and Simulation in Materials Science Laboratory Department of Physics Andhra University Visakhapatnam 530003 Andhra Pradesh India Department of Engineering Chemistry A UCE(A) Andhra University Visakhapatnam 530003 Andhra Pradesh India

Ab initio calculations are performed on the electronic, structural, elastic and optical properties of the cubic per- ovskite KCdF3. Tile Kohn Sham equations are solved by applying the full potential linearized augmented plane wave （FP-LAPW） method. The exchange correlation effects are included through the local density approximation （LDA ）, generalized gradient approximation （GGA） and modified Becke-Johnson （mBJ） exchange potential The calculated lattice constant is in good agreement with the experimental result. The elastic properties such as elastic constants, anisotropy factor, shear modulus, Young＇s modulus and Poisson＇s ratio are calculated. KCdF3 is ductile and elastically anisotropic. The calculations of the electronic band structure, density of states （DOS） and charge density show that this compound has an indirect energy band gap （M-F） with a mixed ionic and covalent bonding. The contribution of the different bands is analyzed from the total and partial density of states curves. Optical response of the dielectric functions, optical reflectivity, absorption coefficient, real part of optical conductivity, refractive index, extinction coefficient and electron energy loss, are presented for the energy range of O-40eV. The compound KCdF3 can be used for high-frequency optical and optoelectronic devices.

关键词： GGA Cd Elastic and Optoelectronic Properties of KCdF3:ab initio Calculations through LDA/GGA/TB-mBJ within FP-LAPW Method LDA FP

A framework for building energy management system with residence mounted photovoltaic

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Building Simulation 2021年第4期14卷 1031-1046页

作者： Chellaswamy C Ganesh babu R Vanathi A Department of Electronics and Communication Engineering Kings Engineering CollegeChennaiIndia Department of Electronics and Communication Engineering SRM TRP Engineering CollegeTiruchirappalliIndia Department of Electronics and Communication Engineering Rajalakshmi Institute of TechnologyChennaiIndia

Efficient utilization of a residential photovoltaic (PV) array with grid connection is difficult due to power fluctuation and geographical dispersion. Reliable energy management and control system are required for overcoming these obstacles. This study provides a new residential energy management system (REMS) based on the convolution neural network (CNN) including PV array environment. The CNN is used in the estimation of the nonlinear relationship between the residence PV array power and meteorological datasets. REMS has three main stages for the energy management such as forecasting, scheduling, and real functioning. A short term forecasting strategy has been performed in the forecasting stage based on the PV power and the residential load. A coordinated scheduling has been utilized for minimizing the functioning cost. A real-time predictive strategy has been used in the actual functioning stage to minimize the difference between the actual and scheduled power consumption of the building. The proposed approach has been evaluated based on real-time power and meteorological data sets.

关键词： building energy management convolution neural network photovoltaic coordinated scheduling

A qualitative study on the adverse reactions of mass treatment for lymphatic filariasis in Orissa,India

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Asian Pacific Journal of Tropical Medicine 2010年第1期3卷 55-58页

作者： babu BV Division of Epidemiology Regional Medical Research CentreIndian Council of Medical ResearchBhubaneswar-751 023India & Indian Council of Medical ResearchNew Delhi 110 029India

Objective:To describe the perceptions of community members and programme partners regarding severity,management and impact of adverse reactions on mass drug administration (MDA) ***:Based on various qualitative data collected from five districts of Orissa,India,where MDA had been implemented during 2002 and *** qualitative surveys included focus group discussions with community members and health workers,and semi-structured interviews with key informants in the community,medical officers at primary health centres,district level health officers and private ***:It showed that many people suffered from adverse reactions,though the reactions were not *** paper reported different ways of management of adverse reactions at the community *** impact of adverse reactions on MDA compliance was serious,as many people did not consume the drug due to fear of adverse *** rumours of adverse reactions and news in media deterred people from consuming the ***:All categories of respondents indicates the need of more information to address the problem of adverse reactions during *** present paper warrants incorporating the messages on adverse reactions during health communication and social mobilization campaigns of MDA.

关键词： Lymphatic filariasis Mass drug administration Adverse reactions Qualitative study Orissa India

Effects of various parameters on the attrition of bed material in a recirculating fluidized bed with a draft tube

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Particuology 2018年第3期16卷 61-70页

作者： Shivali Chourasia babu J. Alappat Department of Civil Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India

We performed an experimental study to investigate the effects of various parameters on the attrition of bed material and its size distribution with increasing operation time in a recirculating fluidized bed （RCFB）. The studied parameters included superficial velocity of fluidizing air, bed inventory, and spacing between the jet top and draft tube bottom （spacer height）. The bed material was prepared from Indian Standard （IS） Grade I sand from sieves with a size range of 2.20-1.00 mm. Experiments were performed at ambient conditions, with the superficial air velocity ranging from 7.13-9.16 m/s, a bed inventory of 7-10 kg, spacing of 0.085 and 0.045 m between the jet top and draft tube bottom, and an operating time of 40 h. We investigated the influence of these parameters in terms of changes in the size distribution of particles, changes in the %-weight of particles of different size ranges, generation of particles with smaller diameters, the decrease of the downcomer bed height, variations in the coefficient of uniformity and coefficient of curvature, and material loss from entrainment of fines with increasing operation time. The mode of attrition was abrasion in all experiments. We found that with increasing operation time and other parameters （bed inventory, superficial air velocity, and spacer height） attrition of the bed material also increased. Generation and elutriation of fines were more pronounced at higher superficial air velocity, bed inventory, and spacer height.

关键词： Attrition Recirculating fluidized bed (RCFB) Fluidization Elutriation Fines

Theoretical prediction and validation of global horizontal solar irradiance for a tropical climate in India

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Frontiers in Energy 2015年第3期9卷 311-321页

作者： Sivasankari SUNDARAM Jakka SARAT CHANDRA babu Department of Chemical Engineering National Institute of Technology Tiruchirappalli 620015 India

This paper aims to propose monthly models responsible for the theoretical evaluation of the global horizontal irradiance of a tropical region in India which is Sivagangai situated in Tamilnadu. The actual measured global horizontal irradiance hails from a 5 MW solar power plant station located at Sivagangai in Tamilnadu. The data were monitored from May 2011 to April 2013. The theoretical assessment was conducted differently by employing a programming platform called Microsoft Visual Basic 2010 Express. A graphical user interface was created using Visual Basic 2010 Express, which provided the evaluation of empirical parameters for model formulation such as daily sunshine duration （5）, maximum possible sunshine hour duration （S0）, extra terrestrial horizontal global irradiance （H0） and extra terrestrial direct normal irradiance （G0）. The proposed regression models were validated by the significance of statistical indicators such as mean bias error, root mean square error and mean percentage error from the predicted and the actual values for the region considered. Comparison was made between the proposed monthly models and the existing normalized models for global horizontal irradiance evaluation.

关键词： global horizontal irradiance (GHI) mean biaserror root mean square error mean percentage error,coefficient of regression Visual Basic 2010 Express