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Machines,Tools and Tool Transporter Concurrent Scheduling in Multi⁃machine FMS with Alternative Routing Using Symbiotic Organisms Search Algorithm

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Journal of Harbin Institute of Technology(New Series) 2023年第6期30卷 35-61页

作者： M.Padma Lalitha N.Sivarami Reddy K.L.Narasimhamu I.Suneetha Electrical engg.dept. Annamacharya Institute of Technology and SciencesRajampet 516126Andhara PradeshIndia mechanical engg.dept. Annamacharya Institute of Technology and SciencesRajampet 516126Andhara PradeshIndia mechanical engg.dept. Mohan Babu UniversityA.Rangampet 517102Andhra PradeshIndia Electronics and Communication engg.dept. Annamacharya Institute of Technology and SciencesTirupati 517520Andhara PradeshIndia

This study explored the concurrent scheduling of machines, tools, and tool transporter(TT) with alternative machines in a multi-machine flexible manufacturing system(FMS), taking into mind the tool transfer durations for minimization of the makespan(MSN). When tools are expensive, just a single copy of every tool kind is made available for use in the FMS system. Because the tools are housed in a central tool magazine(CTM), which then distributes and delivers them to many machines, because there is no longer a need to duplicate the tools in each machine, the associated costs are avoided. Choosing alternative machines for job operations(jb-ons), assigning tools to jb-ons, sequencing jb-ons on machines, and arranging allied trip activities, together with the TT’s loaded trip times and deadheading periods, are all challenges that must be overcome to achieve the goal of minimizing MSN. In addition to a mixed nonlinear integer programming(MNLIP) formulation for this simultaneous scheduling problem, this paper suggests a symbiotic organisms search algorithm(SOSA) for the problem’s solution. This algorithm relies on organisms’ symbiotic interaction strategies to keep living in an ecosystem. The findings demonstrate that SOSA is superior to the Jaya algorithm in providing solutions and that using alternative machines for operations helps bring down MSN.

关键词： machines,tool transporter and tools scheduling FMS tool transporter symbiotic organisms search algorithm.

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Numerical simulation and experimental validation of arc welding of DMR-249A steel

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Defence Technology（防务技术） 2016年第4期12卷 305-315页

作者： Rishi PAMNANI M. VASUDEVAN T. JAYAKUMAR R VASANTHARAJA K.C. GANESH Prototype Training Centre Kalpakkam Tamil Nadu 603 127 India IGCAR Tamil Nadu 603 102 India Metallurgical and Materials engg dept NIT Warangal 506 004 India dept of mech engg NITT Tiruchirappalli 620 015 India

The thermo-mechanical attributes of DMR-249 A steel weld joints manufactured by shielded metal arc welding(SMAW) and activated gas tungsten arc welding(A-GTAW) processes were studied using Finite Element Model(FEM) simulation. The thermal gradients and residual stresses were analyzed with SYSWELD software using double ellipsoidal heat source distribution model. The numerically estimated temperature distribution was validated with online temperature measurements using thermocouples. The predicted residual stresses profile across the weld joints was compared with the values experimentally measured using non-destructive techniques. The measured and predicted thermal cycles and residual stress profile was observed to be comparable. The residual stress developed in double sided A-GTAW joint were marginally higher in comparison to five pass SMAW joint due to phase transformation associated with high heat input per weld pass for A-GTAW process. The present investigations suggest the applicability of numerical modeling as an effective approach for predicting the thermo-mechanical properties influenced by welding techniques for DMR-249 A steel weld joints. The tensile, impact and micro-hardness tests were carried to compare the *** benefits of high productivity and savings of labor and cost associated with A-GTAW compared to SMAW process, the minor variation in residual stress build up of A-GTAW joint can be neglected to develop A-GTAW as qualified alternative welding technique for DMR-249 A steel.? 2016 China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： DMR-249A A-GTAW SMAW FEM SYSWELD Thermo-mechanical Simulation

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Understanding the mechanism of Nanoparticle Formation in a Wire Explosion Process by Adopting the Optical Emission Technique

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Plasma Science and Technology 2013年第6期15卷 562-569页

作者： B.DEBALINA M.KAMARAJ S.R.CHAKRAVARTHI N.J.VASA R.SARATHI dept.of Metallurgical and Materials engg. IIT MadrasChennai 600036India dept.of Aerospace engg. IIT MadrasChennai 600036India dept.of Engineering Design IIT MadrasChennai 600036India dept.of Electrical engg. IIT MadrasChennai 600036India

In the present study nano-tungsten carbide particles were generated in a wire explosion *** plasma generated during the wire explosion process was analyzed using optical emission spectroscopy（OES）.The impact of ambient pressure on the plasma temperature,electron density and plasma lifetime was *** variations of the plasma produced under different experimental conditions were *** produced nanoparticles were characterized through wide angle X-ray diffraction（WAXD） and transmission electron microscopy（TEM） studies. Particles produced with a negative DC charging voltage had a larger mean size when compared to a positive charging *** dependence on the plasma duration was observed where plasma was sustained for a longer duration with a negative DC charging voltage.

关键词： optical emission wire explosion tungsten carbide life time nano particle

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Prediction of Compressive Strength of Various SCC Mixes Using Relevance Vector Machine

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Computers, Materials & Continua 2018年第1期54卷 83-102页

作者： G.Jayaprakash M.P.Muthuraj Assistant Professor Dept.Civil Engg.KGISL Institute of TechnologyCoimbatore-641035India Assistant Professor Dept.Civil Engg.Coimbatore Institute of TechnologyCoimbatore-641014 India

This paper discusses the applicability of relevance vector machine(RVM)based regression to predict the compressive strength of various self compacting concrete(SCC)*** strength data various SCC mixes has been consolidated by considering the effect of water cement ratio,water binder ratio and steel *** vector machine(RVM)is a machine learning technique that uses Bayesian inference to obtain parsimonious solutions for regression and *** RVM has an identical functional form to the support vector machine,but provides probabilistic classification and *** is based on a Bayesian formulation of a linear model with an appropriate prior that results in a sparse *** strength model has been developed by using MATLAB software for training and *** 75%of the data has been used for development of model and 30%of the data is used for *** predicted compressive strength for SCC mixes is found to be in very good agreement with those of the corresponding experimental observations available in the literature.

关键词： Relevance Vector Machine Self-compacting concrete Compressive strength Variance

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MATHEMATICAL MODELING OF EFFECTS OF VARIOUS FACTORS ON UNCERTAINTY OF MEASUREMENT IN MATERIAL TESTING

MATHEMATICAL MODELING OF EFFECTS OF VARIOUS FACTORS ON UNCER...

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The 2011 International Conference on mechanical Engineering and Technology

作者： N.K.Mandavgade Dr.S.B.Jaju Dr.R.R.Lakhe Dr.D.J.Tidke GHRCE mech engg dept SQMS

In case of material testing, the result of a measurement is only an approximation to the value of the measurand and is only complete when it is accompanied of the uncertainty. Computing the reported test result is straightforward;however, computing the uncertainty associated with the test result requires more consideration. The uncertainty evaluation process will encompass a number of influences quantities that affect the result obtained for the measurand In order to quantify the uncertainty we will have to consider all the factors that could influence the results. Material testing measurement process is always doubtful about the value of quantity to be measured which provides the basis for safe working of mechanical components during their operations therefore, Therefore Measurement professionals need to be explain to their clients the value of their work including its limitations. In this paper a methodology is developed for determining the result of measurement concerning the area of material testing and their respective uncertainties Such methodology, which has a possible systematic application, is associated with guarantee of metrological reliability to the results of measurement in material testing, as well as the possibility of implementation in industrial laboratories, and in the Testing Laboratory Network. With this a mathematical model is developed by using regression analysis to explain the impact of various parameters on the measurement uncertainty and quality of material testing.

关键词： Uncertainty of Measurement Tensile testing % Elongation Brinell Hardness testing Rockwell Hardness Test Mathematical Modeling

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EFFECT OF THE OPEN CRACK ON THE PULL-IN INSTABILITY OF AN ELECTROSTATICALLY ACTUATED MICRO-BEAM

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Acta mechanica Solida Sinica 2012年第6期25卷 627-637页

作者： Asadollah Motallebi Mohammad Fathalilou Ghader Rezazadeh mech. Eng. dept. Islamic Azad University mech. Eng. dept. Urmia University

In this paper, the effects of the open crack on the static and dynamic pull-in volt- ages of an electrostatically actuated fixed-fixed and cantilever micro-beam are investigated. By presenting a mathematical modeling, the governing static and dynamic equations are solved by SSLM and Galerkin-based Reduced Order Model, respectively. Then, each single-side open crack in the micro-beam is modeled by a massless rotational spring and the cracked mode shapes and corresponding natural frequencies are calculated by considering the boundary and patching con- ditions and using transfer matrix methods. Finally, the effects of the crack depth ratio, crack position and crack number on the pull-in voltage of the micro-beams are studied. It is shown that beside the residual stresses created in the machining process, the crack（s） can be initiated, growth and consequently change the pull-in voltage of the system by decreasing the natural frequencies. The results show that the crack position is effective beside the crack depth ratio in decreasing the pull-in voltage. Also it is shown that in the fixed-fixed micro-beam there are several points for the crack location in which, the pull-in voltage is extremum.

关键词： MEMS open crack electrostatic pull-in instability

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Comparing Service Quality—An Exploratory Study On Technical Education And Health Care Services

Comparing Service Quality—An Exploratory Study On Technical...

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ICSSSM'04国际会议

作者： M. Palani NathaRaja S. G. Deshmukh Subhash Wadhwa Lecturer Dept. of Mech. Engg Thiagarajar College of Engg. Madurai 625015 India Professor Dept. of Mech. Engg Indian Institute of Technology NewDelhi 110016 India Professor Dept. of Mech. Engg. Indian Institute of Technology NewDelhi 110 016 India

＜正＞ Service oriented research has been accelerated in the recent past in the disciplinary area of marketing. Organizations have realized that the service is having an important contribution to financial performance and customer satisfaction. This paper aim is to bring out the similarities and differences between the two broad service sectors namely Technical Education and Health Care services. The idea of coupled these two sectors since both the service sectors are dealt with Knowledge and skills associated with the service process. It is studied and observed that the two service domains are having many commonalties with slight deviations. The factors responsible for contributing to the service quality have been identified and reported.

关键词： Service Quality Health Care Technical Education

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Braiding process and bank erosion in the Brahmaputra River

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International Journal of Sediment Research 2011年第4期26卷 431-444页

作者： M.P.AKHTAR NAYAN SHARMA C.S.P.OJHA dept.of WRD and M I.I.T.Roorkee dept.of Civil engg. I.I.T.Roorkee

The present work explores relations between stream power,braiding intensities and bank erosion in certain stretches of the Brahmaputra *** this paper,an objective approach is presented to enable quantitative assessment of spatio-temporal behaviour of channel braiding process of the Brahmaputra River by using the Plan Form Index and corresponding estimation of stream power to establish a behavioural pattern of variability of potential energy *** braiding index is compared for discrete years to understand the morphological ***,a real time estimation of stream power for certain stretches of Brahmaputra River is done in order to analyse its variability in braiding intensity and bank *** paper presents the dynamic behaviour of the channel pattern of the Brahmaputra River System in Assam valley of India over a time span of 18 *** procedure addresses the selection of input parameters from digital satellite images,comprising scenes for the years 1990,1997 and 2007 with specific dates,from Dhubri near Indo-Bangladesh Border to Upper *** of GIS technique has been made to extract the required parameters to derive Plan Form Indices for the entire study *** power estimation is done for corresponding latest floods and for corresponding dates of image *** study indicated that due to consistent aggradation of riverbed inducing temporal declination of stream power,there is an occurrence of wide spread *** in turn incurs substantial yearly land loss due to bank erosion,caused by flow concentrations due to temporal evolution of multiple channels in the Brahmaputra River.

关键词： River plan form Braiding indices Bank erosion Stream power

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DDGS HIGH SPEED CAMERA WITH SOME APPLICATIONS

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Acta mechanica Sinica 1996年第2期12卷 186-192页

作者：苏先基诸乾康傅缤励争 dept.of mech. Peking UniversityBeijing 100871China

DDGS high speed camera is an improved version of the multispark system. In this system the time delay and the frame interval can be set arbitrarily from 5 mu s to 10000 mu s, and the intervals may be equal or not. The modified spark gaps can provide point flashes that are small enough in size and strong enough in light for both dynamic caustics and dynamic photo-elasticity. In addition, this system can be changed easily to observe the Bow by schlieren method, Thus, this optical system is suitable to investigate many dynamic problems in the fields of solid and fluid mechanics.

关键词： high speed multispark camera dynamic photoelasticity dynamic caustics schlieren

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GLOBAL VIEW OF MICROSTRUCTURAL EVOLUTION:ENERGETICS,KINETICS AND DYNAMICAL SYSTEMS

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Acta mechanica Sinica 1996年第2期12卷 144-157页

作者：杨卫锁志钢 dept.Eng.mech. Tsinghua Univ.Beijing 100084China mech.Environ.Eng.dept. Univ.CaliforniaSanta BarbaraCA 93106USA

An evolving material structure is in a non-equilibrium state, with free energy expressed by the generalized coordinates. A global approach leads to robust computations for the generalized thermodynamic forces. Those forces drive various kinetic processes, causing dissipation at spots, along curves, surfaces and interfaces, and within volumetric regions. The actual evolution path, and therefore the final equilibrium state, is determined by the energetics and kinetics. A virtual work principle Links the free energy landscape and the kinetic processes, and assigns a viscous environment to every point on the landscape. The approach leads to a dynamical system that governs the evolution of generalized coordinates. The microstructural evolution is globally characterized by a basin map in the coordinate space; and by a diversity map and a variety map in the parameter space. The control of basin boundaries raises the issue of energetic and kinetic bifurcations. The variation of basin boundaries under different sets of controlling parameters provides an analytical way to plot the diversity maps of structural evolution.

关键词： microstructural evolution energetics kinetics dynamic system

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