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Cond.tion Monitoring of CNC Machining Using Ad.ptive Control

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International Journal of Automation and.computing 2013年第3期10卷 202-209页

作者： B. Srinivasa prasad d. siva prasad A. Sand.ep G. Veeraiah d.partment of Mechanical Engineering GITAM Institute of Technology Gandhi Institute of Technology and Management (GITAM) University

In this work, an ad.ptive control constraint system has been d.veloped.for computer numerical control （CNC） turning based.on the feed.ack control and.ad.ptive control/self-tuning control. In an ad.ptive controlled.system, the signals from the online measurement have to be processed.and.fed.back to the machine tool controller to ad.ust the cutting parameters so that the machining can be stopped.once a certain threshold.is crossed. The main focus of the present work is to d.velop a reliable ad.ptive control system, and.the objective of the control system is to control the cutting parameters and.maintain the d.splacement and.tool flank wear und.r constraint valves for a particular workpiece and.tool combination as per ISO stand.rd. Using Matlab Simulink, the d.gital ad.ption of the cutting parameters for experiment has confirmed.the efficiency of the ad.ptively controlled.cond.tion monitoring system, which is reflected.in d.fferent machining processes at varying machining cond.tions. This work d.scribes the state of the art of the ad.ptive control constraint （ACC） machining systems for turning. AIS14140 steel of 150 BHN hard.ess is used.as the workpiece material, and.carbid. inserts are used.as cutting tool material throughout the experiment. With the d.veloped.approach, it is possible to pred.ct the tool cond.tion pretty accurately, if the feed.and.surface roughness are measured.at id.ntical cond.tions. As part of the present research work, the relationship between d.splacement d.e to vibration, cutting force, flank wear, and.surface roughness has been examined.

关键词： Ad.ptive control cond.tion monitoring mod.l based.control system and.flank wear surface roughness d.splacement.

Stud. of resid.al stresses and.d.stortions from the Ti6Al4V based.thinwalled.geometries built using LPBF process

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d.fence Technology（防务技术） 2023年第10期28卷 33-41页

作者： Jagatheeshkumar S Raguraman M siva prasad AVS Nagesha B K Chand.asekhar U Ind.an Institute of Information Technology d.sign and.Manufacturing KancheepuramChennai 600127India Gas Turbine Research Establishment DRDOBengaluru 560093India Wipro3d Bengaluru560058India

The current paper focuses on the pred.ction of resid.al stresses and.d.stortions in the Laser Powd.r Bed.Fusion(LPBF)built Ti6Al4V thin-walled.geometries using Ansys Ad.itive Print(AAP)software which employs a layer-by-layer accumulation of inherent strain to calculate the *** and.anisotropic strain scaling factors were calibrated.initially within the APP software for the Ti6Al4V based.single cantilever beam ***,the numerical simulations were performed.in APP software and.computed.the resid.al stresses and.d.stortions for the varied.process parameters includ.ng laser power,scan speed.and.hatch d.stance while maintaining the layer thickness constant for all the d.sign *** numerical pred.ctions were compared.they were found.to match reasonably well with the XRd.measurements within the calibrated.regime.

关键词： Ti6Al4V Thin-walled.geometry Resid.al stress Inherent strain XRd Ansys ad.itive print

Ensemble Variable Selection for Naive Bayes to Improve Customer Behaviour Analysis

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Computer Systems Science & Engineering 2022年第4期41卷 339-355页

作者： R.siva Subramanian d.Prabha Anna University Chennai600025India d.partment of Computer Science and.Engineering Sri Krishna College of Engineering and TechnologyCoimbatore641008India

Executing customer analysis in a systemic way is one of the possible solutions for each enterprise to und.rstand.the behavior of consumer patterns in an efﬁcient and.in-d.pth *** investigation of customer patterns helps theﬁrm to d.velop efﬁcient d.cisions and.in turn,helps to optimize the enter-prise’s business and.maximizes consumer satisfaction *** con-d.ct an effective assessment about the customers,Naive Bayes(also called.Simple Bayes),a machine learning mod.l is ***,the efﬁcacious of the simple Bayes mod.l is utterly relying on the consumer d.ta used.and.the existence of uncertain and.red.nd.nt attributes in the consumer d.ta enables the simple Bayes mod.l to attain the worst pred.ction in consumer d.ta because of its presumption regard.ng the attributes ***,in practice,the NB pre-mise is not true in consumer d.ta,and.the analysis of these red.nd.nt attributes enables simple Bayes mod.l to get poor pred.ction *** this work,an ensem-ble attribute selection method.logy is performed.to overcome the problem with consumer d.ta and.to pick a stead. uncorrelated.attribute set to mod.l with the NB classiﬁ*** ensemble variable selection,two d.fferent strategies are applied.one is based.upon d.ta perturbation(or homogeneous ensemble,same feature selector is applied.to a d.fferent subsamples d.rived.from the same learning set)and.the other one is based.upon function perturbation(or heterogeneous ensemble d.fferent feature selector is utilized.to the same learning set).Further-more,the feature set captured.from both ensemble strategies is applied.to NB ind.-vid.ally and.the outcome obtained.is ***,the experimental outcomes show that the proposed.ensemble strategies perform efﬁciently in choosing a stead. attribute set and.increasing NB classiﬁcation performance efﬁciently.

关键词： Naive bayes or simple bayes variable selection homogeneous ensemble heterogeneous ensemble customer pred.ction

One-d.mensional numerical investigation on multicylind.r gasoline engine fueled.by micro-emulsions,CNG,and.hyd.ogen in d.al fuel mod.

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Chinese Journal of Aeronautics 2023年第5期36卷 57-65页

作者： Ufaith QAd.RI d.siva KRISHNA REd.Y Amjad.ALI PASHA Mohammad.IRFAN ALAM d.partment of Mechanical Engineering Sreenidhi UniversityYamnampetGhatkesar Hyderabad 501301India School of Mechanical Engineering SRM Institute of Science and TechnologyKattankulathurChennai 603203India Aerospace Engineering d.partment King Abdulaziz UniversityJeddah 21589Saudi Arabia d.partment of Aerospace Engineering VIT Bhopal UniversitySehore 466665India

This research work is the novel state-of-the-art technology performed.on multi-cylind.r SI engine fueled.compressed.natural gas,emulsified.fuel,and.hyd.ogen as d.al *** work pred.cts the overall features of performance,combustion,and.exhaust emissions of ind.vid.al fuels based.on AVL Boost simulation *** types of alternative fuels have been compared.and.*** results show that hyd.ogen prod.ces 20%more brake power than CNG and.25%more power than micro-emulsion fuel at 1500 r/min,which further increases the brake power of hyd.ogen,CNG,and.micro-emulsions in the range of 25%,20%,and.15%at higher engine speed. of 2500-4000 r/min,*** ad.ition,the brake-specific fuel consumption is the lowest for 100%hyd.ogen,followed.by CNG 100%and.then micro-emulsions at 1500 r/*** 2500-5000 r/min,there is a significant d.op in brake-specific fuel consumption d.e to a lean mixture at higher engine *** CO,HC,and.NOx emissions significantly improve for hyd.ogen,CNG,and.micro-emulsion *** fuel shows zero CO and.HC emissions and.is the main objective of this research to prod.ce 0%carbon-based.emissions with a slight increase in NOx emissions,and.CNG shows 30%lower CO emissions than micro-emulsions and.21.5%less hyd.ocarbon emissions than micro-emulsion fuel at stoichiometric air/fuel ratio.

关键词： CNG Emissions Hyd.ogen Ignition Micro-emulsions Performance

Optimization of AWJM Process Parameters on 3d.Printed.Onyx-Glass Fiber Hybrid.Composite

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哈尔滨工业大学学报:英文版 2023年第2期30卷 84-98页

作者： d.armalingam G Arun prasad M d.epak Panghal Sachin Salunkhe siva kumar M Rathinasuriyan C d.partment of Mechanical Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and TechnologyAvadiChennai-600062Tamil NaduIndia d.partment of Fashion Technology National Institute of Fashion TechnologyNew Delhi-11016India

Compared.with conventional manufacturing method., the ad.itive manufacturing technique enhances mechanical properties. The present investigation of ad.itive manufacturing technique is focused.on d.lamination stud.es of Onyx-Glass Fiber Hybrid.Polymer Composite(OGFHPC) along with surface roughness properties d.ring machining(d.illing) of composites through abrasive water jet machining(AWJM). However, d.lamination is a major issue d.ring machining of OGFHPC. In ord.r to overcome these d.awbacks, the fabrication of OGFHPC was carried.out using fused.d.position mod.ling(Fd.) technology which is an ad.itive manufacturing method.with Mark forged.Mark Two 3d.composite printer. The machinability stud.es were cond.cted.for d.illing operation through AWJM process with d.fferent abrasive mass flow rates, d.illing d.ameters and.traverse speed.. These d.illing machinability process parameters were optimized.through the d.sign of experiments-Taguchi analysis followed.by the analysis of variance(ANOVA) and.valid.ted.through the Harmony Search Algorithm(HSA), Whale Optimization Algorithm(WOA) and.Grey Wolf Optimization Algorithm(GWO). It was observed.that minimum d.lamination and.surface roughness of OGFHPC were optimized.for AWJM at abrasive mass flow rates(450 g/min), d.illing d.ameters(12 mm) and.traverse speed.rate(30 mm/min).

关键词： Onyx-Glass composite fused.d.position mod.ling AWJM d.lamination surface roughness Taguchi analysis

Stability of three-d.mensional printable foam concrete as function of surfactant characteristics

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结构与土木工程前沿:英文版 2023年第6期17卷 935-947页

作者： Ud.y BOd.EPALLI Ind. siva Ranjani GANd.I Biranchi PANd. d.partment of Civil Engineering Indian Institute of TechnologyGuwahatiAssam781039India Sustainable Resources for Ad.itive Manufacturing(SReAM)Laboratory Department of Mechanical EngineeringIndian Institute of TechnologyGuwahatiAssam781039India

Extrud.bility is one of the most critical factors when d.signing three-d.mensional printable foam *** extrusion process likely affects the foam stability which necessitates the investigation into surfactant properties particularly for concrete mixes with high foam *** many stud.es have been cond.cted.on trad.tional foam concrete in this context,stud.es on three-d.mensional printed.foam concrete are *** ad.ress this research gap,the effects of surfactant characteristics on the stability,extrud.bility,and.build.bility of three-d.mensional printed.foam concrete mixes with two d.sign d.nsities(1000 and.1300 kg/m^(3))using two d.fferent surfactants and.stabilizers(synthetic-based.sod.um lauryl sulfate stabilized.with carboxymethyl cellulose sod.um salt,and.natural-based.hingot surfactant stabilized.with xanthan gum)were investigated.in this *** d.nsity tests were cond.cted.before and.after the extrusion to d.termine stability of the foam *** results were then correlated.with surfactant qualities,such as viscosity and.surface tension,to und.rstand.the importance of key parameters in three-d.mensional printing of foam *** on the experimental results,surfactant solu1tion with viscosity exceed.ng 5 m Pa·s and.surface tension lower than 31 mN/m was recommend.d.to yield.stable three-d.mensional printable foam concrete ***,the volume of foam in the mix significantly affected.the printability *** trad.tional foam concrete,the variation in the stabilizer concentration and.d.nsity of concrete were found.to have insignificant effect on the fresh-state-characteristics(slump,slump flow,and.static yield.stress)and.air void.microstructure of the stable mixes.

关键词： foam concrete 3d.printable concrete stability rheology air void.microstructure

Impact of frailty on end.scopic retrograd. cholangiopancreatography outcomes in nonagenarians:A United.States national experience

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World.Journal of Gastrointestinal End.scopy 2024年第3期16卷 148-156页

作者： Sanket d.irubhai Basid. d.shyant Singh d.hiya Muhammad.Nad.em Yousaf Brind. Basid. Bhanu siva Mohan Pinnam Manesh Kumar Gangwani Hassam Ali Sahib Singh Yash R Shah d.ksh Ahluwalia Mihir Prakash Shah Saurabh Chand.n Neil R Sharma Shyam Thakkar d.partment of Internal Med.cine University of Missouri-ColumbiaColumbiaMO 65212United States d.vision of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States d.vision of Gastroenterology and.Hepatology University of MissouriColumbiaMO 65212United States d.partment of Rheumatology Medical College of GeorgiaAugusta UniversityNorth AugustaGA 30912United States d.partment of Internal Med.cine John H.Stroger Hospital of Cook CountyChicagoIL 60612United States d.partment of Internal Med.cine The University of ToledoToledoOH 43606United States d.vision of Gastroenterology and.Hepatology East Carolina University/Brody School of MedicineGreenvilleNC 27858United States d.partment of Internal Med.cine Sinai HospitalBaltimoreMD 21215United States d.partment of Internal Med.cine Trinity Health Oakland/Wayne State UniversityPontiacMI 48341United States d.vision of Gastroenterology and.Hepatology Creighton University School of MedicineOmahaNE 68131United States d.vision of Interventional Oncology&Surgical End.scopy GI Oncology Tumor Site TeamParkview Cancer InstituteParkview HealthFort WayneIN 46845United States Section of Gastroenterology&Hepatology West Virginia University School of MedicineMorgantownWV 26505United States

BACKGROUNd.End.scopic retrograd. cholangiopancreatography(ERCP)is an essential therapeutic tool for biliary and.pancreatic *** and.eld.rly patients,especially those aged.90 years are generally consid.red.a higher-risk population for ERCP-related.*** To investigate outcomes of ERCP in the Non-agenarian population(≥90 years)concerning *** This is a cohort stud. using the 2018-2020 National Read.ission *** aged.90 were id.ntified.who und.rwent ERCP,using the international classification of d.seases-10 cod. with clinical *** Hopkins’s ad.usted.clinical groups frailty ind.cator was used.to classify patients as frail and.*** primary outcome was mortality,and.the second.ry outcomes were morbid.ty and.the 30 d.read.ission rate related.to *** used.univariate and.multivariate regression mod.ls for *** A total of 9448 patients were ad.itted.for any ind.cations of *** and.non-frail patients were 3445(36.46%)and.6003(63.53%)*** for ERCP were Choled.cholithiasis(74.84%),Biliary pancreatitis(9.19%),Pancreatico-biliary cancer(7.6%),Biliary stricture(4.84%),and.Cholangitis(1.51%).Mortality rates were higher in frail group[ad.usted.od.s ratio(aOR)=1.68,P=0.02].The Intra-proced.ral complications were insigni-ficant between the two groups which includ.d.bleed.ng(aOR=0.72,P=0.67),accid.ntal punctures/lacerations(aOR=0.77,P=0.5),and.mechanical ventilation rates(aOR=1.19,P=0.6).Post-ERCP complication rate was similar for bleed.ng(aOR=0.72,P=0.41)and.post-ERCP pancreatitis(aOR=1.4,P=0.44).Frail patients had.a longer length of stay(6.7 d.vs 5.5 d.and.higher mean total charges of hospitalization($78807 vs$71392)compared.to controls(Pd.all-cause read.ission rates between frail and.non-frail patients were similar(P=0.96).CONCLUSION There was a significantly higher mortality risk and.healthcare burd.n amongst nonagenarian frail patients und.rgoing ERCP compared

关键词： End.scopic retrograd. cholangiopancreatography Nonagenarians Frailty Mortality Healthcare burd.n

Effect of d.ffuser Vane Shape on the Performance of a Centrifugal Compressor Stage

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Journal of Thermal Science 2014年第2期23卷 127-132页

作者： T Ch siva Red.y GV Ramana Murty MVSSSM prasad Sreenid.i Institute of Science and.Technology GhatkesarHyderabadA.P.India Vasavi College of Engineering Hhyd.rabad

The present paper reports the results of experimental investigations on the effect of d.ffuser vane shape on the performance of a centrifugal compressor *** stud.es were cond.cted.on the chosen stage having a backward.curved.impeller of 500 mm tip d.ameter and.24.5 mm wid.h and.its d.sign flow coefficient is Фd.*** d.fferent low solid.ty d.ffuser vane shapes namely uncambered.aerofoil,constant thickness flat plate and.circular arc cambered.constant thickness plate were chosen as the variants for d.ffuser vane shape and.all the three shapes have the same thickness to chord.ratio(t/c=0.1).Flow coefficient,polytropic efficiency,total head.coefficient,power coefficient and.static pressure recovery coefficient were chosen as the parameters for evaluating the effect of d.ffuser vane shape on the stage *** results show that there is reasonable improvement in stage efficiency and.total head.coefficient with the use of the chosen d.ffuser vane shapes as compared.to conventional vaneless *** is also noticed.that the aero foil shaped.LSd.has shown better performance when compared.to flat plate and.circular arc *** aerofoil vane shape of the d.ffuser blad. is seen to be tolerant over a consid.rable range of incid.nce.

关键词：叶片形状扩散器离心压气机性能离心式压缩机流量系数圆弧轮廓扬程系数

Fabrication and.Characterisation of Rutile-TiO_2 Coatings on Metallic Alloy Substrates

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材料热处理学报 2004年第5B期25卷 862-865页

作者： d. siva Rama Krishna School of Materials Engineering Nanyang Technological University Singapore 639798

In the present work, attempts have been mad. to extend.the use of the tribological and.chemical properties of rutile-TiO2 to metallic alloy systems, by forming a rutile coating on the metallic substrates. Two metallic alloys were selected.in this stud., includ.ng AISI316L austenitic stainless steel and.aluminium alloy. The rutile-based.coatings were fabricated.by magnetron sputter d.position of a pure titanium coating first, and.then thermal oxid.tion of the coated.specimens to partially convert the titanium coating to rutile oxid. and.to promote interfacial reactions which can significantly enhance the coating-substrate ad.esion strength. The structures and.properties of the coating-substrate systems were characterized.by a variety of analytical and.experimental techniques, includ.ng X-ray d.ffraction, glow d.scharge spectrometry, high resolution SEM, nanoind.ntation, microscratch, friction and.wear testing, as well as electrochemical testing. The results show that the friction and.wear properties, as well as the corrosion resistance of the metallic alloys can be significant enhanced.by surface engineering with rutile-TiO2.

关键词：金红石二氧化钛不锈钢磨损性能耐蚀性