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Shunmugam M S
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Shunmugam M S
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Shunmugam M S
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Shunmugam, M. S.
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27 results
Now showing 1 - 10 of 27
- PublicationModeling of wire-cut EDM by neural network(01-12-1999)
; ;Kumar, S. SaiKaul, I. K.Wire-cut EDM is a highly complex process, which is characterized by non-linear behavior. Due to very large number of input parameters, a Neural Network Approach is followed in this paper to model this process. A large number of experiments have been carried out to train the network. The model is also tested using additional experimental data. It is found that neural network models of wire-cut EDM process provide results with required accuracy. The important input parameters have been identified and reported in this paper. - PublicationCondition monitoring in reaming through acoustic emission signals(15-02-1998)
;Mathews, P. G.This study investigates the nature of the acoustic emission (AE) generated during the reaming of EN4 steel workpieces. For this purpose, experiments were conducted in a horizontal boring and milling machine to determine the effects of cutting parameters. The results show good correlation between the AE parameters and the severity of the contact conditions during chip formation. - PublicationOperation sequencing in CAPP using genetic algorithms(01-01-1999)
;Reddy, S. V.Bhaskara; Narendran, T. T.Computer aided process planning (CAPP) is an important interface between computer aided design (CAD) and computer aided manufacturing (CAM) in computer integrated manufacturing (CIM). Operation sequencing in process planning is concerned with the selection of machining operations in steps that can produce each form feature of the part by satisfying relevant technological constraints specified in the part drawing. A single sequence of operations may not be the best for all the situations in a changing production environment with multiple objectives such as minimizing number of set-ups, maximizing machine utilization and minimizing number of tool changes. This paper demonstrates the application of genetic algorithms as a global search technique for a quick identification of optimal or near optimal operation sequences in a dynamic planning environment. A novel initialization scheme for representing the genetic code and a new crossover operator are designed to retain the local operation precedence for each form feature. Since sequences can be obtained quickly, this approach can actually be used by the process planner to generate alternative feasible sequences for the prevailing operating environment. © 1999 Taylor & Francis Group, LLC. - PublicationPulse train studies in EDM with controlled pulse relaxation(01-01-1992)
;Gangadhar, A.; Philip, P. K.Pulse train studies reveal the typical characteristics of the spark discharges associated with EDM. It has been observed that the use of reverse polarity and a powder-compact tool electrode influences the discharge phenomenon and results in an appreciable amount of deposition on the work surface. In the present investigation, electro-discharge machining has been carried out using combined pulse generation and a relaxation circuit which also enhances the tool electrode transfer and the pulse trains have been recorded using a dual-trace storage oscilloscope and an X-Y plotter. © 1992. - PublicationInvestigations into reaming processes using a frequency-decomposition technique(01-01-1990)
; ;Shunmugam, M. S.Somasundaram, G.Reaming is carried out after twist drilling to enlarge and finish the holes accurately. The experiments were carried out on mild-steel workpieces at different reaming conditions and the accuracy and surface finish values are very briefly compared with the results of earlier investigators. A detailed analysis of the harmonic contents of the axial and transverse profiles of the reamed holes was carried out to bring out the process characteristics. A preliminary study of the cutting forces in reaming based on the spectral analysis is also reported. © 1990 Taylor & Francis Group, LLC. - PublicationFunction-oriented form evaluation of engineering surfaces(01-01-1998)
;Narayanan Namboothiri, V. N.Workpieces make contact on their functional boundaries, not on the best fit surfaces. Better quality products can be made by controlling parameters of the production process and evaluating the workpiece based on functional requirements. A new algorithm is proposed in this paper, based on a sound mathematical background, to obtain the functional boundaries that are best represented by enveloping features. © 1998 Elsevier Science Inc. - PublicationAn algorithm for form error evaluation - using the theory of discrete and linear Chebyshev approximation(01-01-1991)
;Dhanish, P. B.ISO defines form error based on the concept of minimum zone, but does not describe the methods to obtain the same. In this paper, drawbacks of the available methods are discussed and a new algorithm is presented. This algorithm is guaranteed to give the minimum value of form error. The algorithm is well-suited for implementation on a computer which may be interfaced with a Coordinate Measuring Machine. © 1991. - PublicationEstablishing gear tooth surface geometry and normal deviation: Part II - Bevel gears(01-07-1998)
; ;Subba Rao, B.Jayaprakash, V.In this part, the concept of enveloping tangent planes dealing with gear geometry and normal deviations is applied to bevel gears. Exact spherical involute is established by the procedure outlined in this paper. Straight tooth and spiral tooth bevel gears are considered in this paper. The method of determining the normal deviation from the idealized surface and the validation of the method are reported here. Effectiveness of the proposed method for obtaining normal deviation is established by considering spiral bevel gear geometry based on circular arc. © 1998 Elsevier Science Ltd. - PublicationEvaluation of straightness and flatness error using computational geometric techniques(01-01-1999)
; The Coordinate Measuring Machines capable of automated measurement are being widely used in on-line and off-line inspection. The measurement data obtained from these inspection devices have to be further processed and analyzed, to assess the geometric form of the manufactured components. In the present work, algorithms based on Computational Geometric techniques have been developed for minimum zone and function-oriented evaluation of straightness and flatness. The algorithms are validated using the simulated data and the data available in the literature. - PublicationSignature of machine tool errors on surface texture by DPS(01-01-1992)
;Pandit, S. M.The dynamic effect of machine tool errors leaves its signature on machined surfaces. This paper proposes an application of data dependent systems (DDS) methodology to recover this signature from the surfaces in a comprehensive manner and provides a realistic basis for machine-tool acceptance. The approach is illustrated by experimental results from three different lathes. It is shown that relative contributions due to the feed wavelength reveal the dynamic performance of the machine tools. The deviation from the nominal and the spread of the estimated feed wavelength quantify the accuracy and rigidity, the feed wavelength being precisely maintained with minimal spread in a machine tool with high accuracy and high rigidity. Presence of other wavelengths and their relative contribution to the RMS surface roughness serve as quantitative indicators of other machine tool errors. © 1992 by ASME.
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