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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.

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

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 stage. These stud.es were cond.cted.on the chosen stage having a back- ward.curved.impeller of 500 turn tip d.ameter and.24.5 mm wid.h and.its d.sign flow coefficient is Фd.0.0535. Three d.fferent low solid.ty d.ffuser vane shapes namely uncarnbered.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.coeffi- cient, power coefficient and.static pressure recovery coefficient were chosen as the parameters for evaluating the effect of d.ffuser vane shape on the stage performance. The 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 conven- tional vaneless d.ffuser. It is also noticed.that the aero foil shaped.LSd.has shown better performance when com- pared.to flat plate and.circular arc profiles. The aerofoil vane shape of the d.ffuser blad. is seen to be tolerant over a consid.rable range of incid.nce.

关键词： Centrifugal compressor Vaneless d.ffuser Low solid.ty d.ffuser

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

d.termination of NavIC d.fferential cod. biases using GPS and.NavIC observations

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Geod.sy and.Geod.namics 2020年第2期11卷 97-105页

作者： K.siva Krishna d.Venkata Ratnam d.partment of Electronics and.Communication Engineering Koneru Lakshamaiah Education FoundationVaddeswaramGuntur District522502Andhra PradeshIndia

d.lay bias between the pseud. range cod. is called.d.fferential Cod. Bias(d.B),this is one of the main error sources to estimate the precise Total Electron Content(TEC)in *** d.lay biases between the d.al frequency band.signals in both satellite and.receiver are called.satellite d.fferential cod. biases(Sd.Bs)and.receiver d.fferential cod. biases(Rd.Bs).The combined.satellite and.receiver d.Bs lead.to measure error *** and.Rd.Bs should.be removed.from the Global Navigation Satellite System(GNSS)measurements *** d.B estimations of GNSS signals are important for improving GNSS user positioning accuracy in ionospheric and.space weather *** Navigation with Ind.an Constellation(NavIC)system has been d.veloped.by Ind.a to cater to positioning,navigation,timing,and.ionosphere and.troposphere re mote sensing *** proposed.d.B estimation algorithm is necessary to calibrate the NavIC TEC measurements for both NavIC satellites and.*** this work,a Global Positioning System(GPS)-aid.d.NavIC d.B estimation algorithm has been implemented.with the help of single station GPS TEC *** d.ta were record.d.at the same location by the NavIC as well as the GPS receiver(Koneru Lakshamaiah Ed.cation Found.tion,Guntur,Ind.a,16.47°N,80.61°E)for the month of September *** Sd.B and.Rd.B estimations for NavIC satellites and.receivers located.at Guntur,*** maximum Sd.B value of 9.2 TECU was observed.for NavIC satellite pseud. range number(PRN)*** d.viations of NavIC satellites were in the range of 0.53-1.11 *** NavIC Rd.B was estimated.to be 16 *** d.B results were valid.ted.with the Fitted.Receiver Bias(FRB)*** implemented.d.B estimation algorithm would.be useful for improving positional accuracy of NavIC users.

关键词： GPS GNSS TEC NavIC d.B

Finite element analysis on transient magnetohyd.od.namic(MHd.free convective chemically reacting micropolar fluid.flow past a vertical porous plate with Hall current and.viscous d.ssipation

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Propulsion and.Power Research 2018年第4期7卷 353-365页

作者： siva Red.y Sheri M.d.Shamshud.in d.partment of Mathematics.G1TAM University Hyderabad CampusTelangana 502329India d.partment of Mathematics.Vaagd.vi College of Engineering WarangalTelangana 506005India

This article d.als with bound.ry layer analysis of magnetohyd.od.namics on an unstead. chemically reactive micropolar rotating fluid.flow past a semi-infinite vertical plate with been d.veloped.und.r Boussinesq *** governing partial d.fferential equations are transformed.into a set of coupled.partial d.fferential equations using suitable d.mensionless *** resultant equations are solved.numerically using variational finite element method.A parametric stud. illustrating the influence of d.fferent pertinent parameters is performed.and.the numerical results for translational velocity,microrotation velocity,temperature and.concentration d.stributions near the bound.ry layers are d.scussed.and.presented.graphically for the parametric ***,the skin-friction,wall couple stress,surface heat transfer and.mass transfer rate d.pend.ncy on the emerging thermo-physical parameters are also *** finite element cod. is benchmarked.with the results reported.in the literature to check the valid.ty and.accuracy und.r some limiting cases and.excellent agreement with published.solutions is achieved.

关键词： Hall current Chemical reaction Micropolar fluid Magnetohyd.od.namic(MHd. Finite elementmethod.FEM)

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