Showing papers by "PSG College of Technology published in 2007"
TL;DR: In this article, the effect of stacking sequence on tensile, flexural and interlaminar shear properties of untreated woven jute and glass fabric reinforced polyester hybrid composites has been investigated experimentally.
332 citations
TL;DR: A plan of experiments based on Taguchi technique was used to acquire the data in a controlled way as mentioned in this paper, where an orthogonal array and analysis of variance was employed to investigate the influence of wear parameters like as normal load, sliding speed and sliding distance on dry sliding wear of the composites.
274 citations
TL;DR: In this article, the influence of sliding speed on dry sliding wear behavior and the extent of subsurface deformation in aluminium metal matrix composites, namely Al 2219/15SiCp and Al 22 19/15 SiCp-3graphite all fabricated by the liquid metallurgy route, was investigated.
241 citations
TL;DR: In this paper, a review on the literature and contribute a comprehensive model that would identify the criteria for attaining agility and suggest a procedure to successfully implement it in manufacturing arena is presented.
Abstract: Purpose – To review on the literature and contribute a comprehensive model that would identify the criteria for attaining agility and suggest a procedure to successfully implement it in manufacturing arena.Design/methodology/approach – The literature dealing with agile manufacturing (AM) criteria were studied. The meaning and definitions of AM were derived. Further, the criteria enunciated in certain papers were identified. These findings were used to design a 20 criteria agile model. Subsequently, its implementation procedure was designed.Findings – While reviewing the literature, the following observations were made: time and again, some researchers brought out certain criteria of AM; these criteria do not comprehensively focus towards attaining agility; the researchers who have contributed these criteria have failed to evolve an implementation procedure.Research limitations/implications – Contributions of this paper are based on reviewing the literature. Since, no survey in manufacturing arena has been...
143 citations
TL;DR: In this paper, the effect of hybridization of glass fibre with jute fibre as well as the effect on the hole size on the notch sensitivity of the composites under consideration is discussed.
132 citations
15 Jan 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effect of abrading distance, viz., 270, 540, 810 and 1080m and different loads of 22 and 32 n at 200 n, was investigated.
Abstract: Three-body abrasive wear behaviour of carbon–epoxy (C–E) and glass–epoxy (G–E) composites has been investigated. The effect of abrading distance, viz., 270, 540, 810 and 1080 m and different loads of 22 and 32 N at 200 rpm have been studied. The wear volume loss and specific wear rate as a function of load and abrading distance were determined. The wear volume loss increases with increasing load/abrading distance. However, the specific wear rate decreases with increase in abrading distance and increases with the load. However, C–E composite showed better abrasion wear resistance compared to G–E composite. The worn surface features have been examined using scanning electron microscope (SEM). SEM micrographs of abraded composite specimens revealed the high percentage of broken glass fiber compared to carbon fiber and also better interfacial adhesion between epoxy and carbon fiber.
125 citations
TL;DR: In this paper, the ionic coordination in polymeric electrolytes, as determined by Raman spectroscopy, has been discussed in relation to the conductance behavior of polyvinyl pyrrolidone and ammonium thiocyanate.
Abstract: Polymer electrolytes based on poly ( N -vinyl pyrrolidone) (PVP) and ammonium thiocyanate (NH 4 SCN) prepared by solution cast technique have been studied using X-ray diffraction (XRD), Raman and impedance spectroscopic techniques. The XRD and Raman spectra for the electrolytes indicate that the amorphous nature of PVP increases with the increase of the concentration of ammonium thiocyanate. The spectral changes in the Raman bands of the C O and the C N stretching indicate the interaction between the salt and the polymer. The conductivity analysis shows that the 20 mol% ammonium thiocyanate doped polymer electrolyte exhibits high ionic conductivity and it has been found to be 1.7×10 −4 S cm −1 , at room temperature. The ionic coordination in the polymeric electrolytes, as determined by Raman spectroscopy, has been discussed in relation to the conductance behavior.
118 citations
TL;DR: In this paper, a second-order kinetic model is proposed and is found to well represent the experimental data of Auramine O degradation by ZnO catalyst for the range of initial dye concentration studied.
117 citations
TL;DR: In this paper, a nanotitania was synthesized by the sol-gel process by controlling the crystallite size through calcination and the resulting nanocrystals were characterized using XRD, FT-Raman, SEM/EDX, DSC/TGA and UV-Vis spectroscopic techniques.
113 citations
TL;DR: This paper introduces a new model for image texture classification based on wavelet transformation and singular value decomposition that achieves higher recognition rates compared to the traditional subband energy- based approach, the hybrid IMM/SVM approach, and the GGD-based approach.
Abstract: This paper introduces a new model for image texture classification based on wavelet transformation and singular value decomposition. The probability density function of the singular values of wavelet transformation coefficients of image textures is modeled as an exponential function. The model parameter of the exponential function is estimated using maximum likelihood estimation technique. Truncation of lower singular values is employed to classify textures in the presence of noise. Kullback-Leibler distance (KLD) between estimated model parameters of image textures is used as a similarity metric to perform the classification using minimum distance classifier. The exponential function permits us to have closed-form expressions for the estimate of the model parameter and computation of the KLD. These closed-form expressions reduce the computational complexity of the proposed approach. Experimental results are presented to demonstrate the effectiveness of this approach on the entire 111 textures from Brodatz database. The experimental results demonstrate that the proposed approach improves recognition rates using a lower number of parameters on large databases. The proposed approach achieves higher recognition rates compared to the traditional subband energy-based approach, the hybrid IMM/SVM approach, and the GGD-based approach.
91 citations
01 Sep 2007
TL;DR: In order to vary the compression ratio, some method of varying the geometric compression ratio through changing the clearance volume is required; various patents have been filed and designs presented, including modification of compression ratio by moving the cylinder head, variation of combustion chamber volume using a secondary... as mentioned in this paper.
Abstract: Increasingly stringent emissions and fuel economy standards have long remained a source of challenges for research in automobile engine technology development towards the more thermally efficient and less polluting engine. Spark ignition (SI) engines have lower part-load efficiency when compared with the diesel engines. The greatest opportunity for improving SI engine efficiency is by way of higher compression ratio, variable valve timing, low friction, reducing throttling losses, boosting, and down-sizing. Variable compression ratio (VCR) technology has long been recognized as a method for improving the fuel economy of SI engines. In order to vary the compression ratio, some method of varying the geometric compression ratio through changing the clearance volume is required. There are several ways of doing this; various patents have been filed and designs presented, including modification of the compression ratio by moving the cylinder head, variation of combustion chamber volume using a secondary...
TL;DR: In this article, the authors have attempted to model the temperature distribution for various joint designs of thermoplastics as practised by industry and simulation is done in ANSYS.
TL;DR: The breast tissue classification obtained is comparatively better than the other normal methods and is a part of developing a computer aided decision (CAD) system for early detection of breast cancer.
TL;DR: In this article, a single stage batch adsorberber was designed for different operating line (V / M ) ratios using the Redlich-Peterson isotherm, which is a special case of Langmuir-Isotherm when the constant g equals unity.
TL;DR: In this paper, the effects of hybridization of glass fiber on low velocity impact behavior and damage tolerance capability of woven jute fabric composite were explored and the results indicated that glass hybrid laminates have better impact energy absorption capacity than jute composite.
Abstract: This study explores the effects of hybridization of glass fiber on low velocity impact behavior and damage tolerance capability of woven jute fabric composite. Laminates were fabricated by the hand lay—up technique using a mold and cured under light pressure at room temperature. Low velocity impact tests were conducted on jute and hybrid samples (150 × 150 mm) using an instrumented drop weight impact tower. All the samples were impacted at four different energy levels by changing the drop height, and load—energy—time plots were recorded using data acquisition software. Some of the samples were subjected to the non-destructive test (C-scan) to study the nature and extent of damage and to measure the delamination area. Post-impact tension tests were conducted to assess the damage tolerance capability of the composites. The results of the study indicated that jute laminates have better impact energy absorption capacity than jute—glass hybrid laminates; however their damage tolerance capability is less than j...
TL;DR: In this article, the surface roughness variations on the drilled surface and extension of surface and sub-surface deformation due to drilling were investigated experimentally using a scanning electron microscope (SEM).
Abstract: The main concern in the present study is the surface roughness variations on the drilled surface and extension of surface and sub-surface deformation due to drilling. The influence of different tools and cutting conditions on Al2219/15%SiCp and Al2219/15%SiCp-3%Graphite (hybrid) composites is investigated experimentally. The composites are fabricated by liquid metallurgy method. The drilling tests are conducted with carbide and coated carbide tools. The surface roughness decreases with the increase in cutting speed and increases with the increase in feed rate. The surface is analyzed using scanning electron microscope (SEM). Microhardness profiles indicate that the subsurface deformation extends up to a maximum of 120 μm below the machined surface for Al2219/15SiCp-3Gr composite when compared to 150 μm in Al2219/15SiCp composite.
01 Jan 2007
TL;DR: This paper proposes an energy efficient adaptive multipath routing technique which utilizes multiple paths between source and the sink, adaptive because they have low routing overhead, intended to provide a reliable transmission environment with low energy consumption.
Abstract: Routing in wireless sensor networks is a demanding task. This demand has led to a number of routing protocols which efficiently utilize the limited resources available at the sensor nodes. All these protocols typically find the minimum energy path. In this paper we take a view that, always using the minimum energy path deprives the nodes energy quickly and the time taken to determine an alternate path increases. Multipath routing schemes distribute traffic among multiple paths instead of routing all the traffic along a single path. Two key questions that arise in multipath routing are how many paths are needed and how to select these paths. Clearly, the number and the quality of the paths selected dictate the performance of a multipath routing scheme. We propose an energy efficient adaptive multipath routing technique which utilizes multiple paths between source and the sink, adaptive because they have low routing overhead. This protocol is intended to provide a reliable transmission environment with low energy consumption, by efficiently utilizing the energy availability and the received signal strength of the nodes to identify multiple routes to the destination. Simulation results show that the energy efficient adaptive multipath routing scheme achieves much higher performance than the classical routing protocols, even in the presence of high node density and overcomes simultaneous packet forwarding
01 Mar 2007
TL;DR: This paper proposes fuzzy system and neural network approaches to identify the incipient faults in the power transformer using dissolved gas analysis (DGA) method and its effectiveness is analyzed through simulation in terms of accuracy in identifying the transformer faults.
Abstract: This paper proposes fuzzy system and neural network approaches to identify the incipient faults in the power transformer using dissolved gas analysis (DGA) method. Using the IEC/IEEE DGA criteria and the gas concentration values as references the fuzzy diagnosis system and neural network are built. The proposed systems are verified using practical data collected from Electricity Board. The fuzzy system is tested with triangular, trapezoidal and Gaussian membership functions and its effectiveness is analyzed through simulation in terms of accuracy in identifying the transformer faults. The proposed Back propagation network is verified to overcome the drawbacks of conventional methods. The proposed schemes are simulated and tested in the software environment. The simulation results are presented.
TL;DR: In this article, the mechanical performance of isothalic polyester-based untreated woven jute-fabric composites subjected to various types of loading has been experimentally investigated.
Abstract: In this article, mechanical performance of isothalic polyester-based untreated woven jute-fabric composites subjected to various types of loading has been experimentally investigated. The laminates were prepared by hand lay-up technique in a mold. Specimens for tests were fabricated as per ASTM standards. All the tests (except impact) were conducted on closed loop servo hydraulic MTS 810 material test system using data acquisition software Test Works-II. From the results obtained, it was found that the tensile strength and tensile modulus of jute-fabric composite are 83.96% and 118.97% greater than the tensile strength and modulus of unreinforced resin, respectively. The results of other properties, such as flexural, in-plane shear, interlaminar shear, impact, etc., also revealed that the isothalic-polyester-based jute-fabric composite have good mechanical properties and can be a potential material for use in medium load-bearing applications. The failure mechanism and fiber-matrix adhesion were analyzed by scanning electron microscope. Effects of long-term immersion in water on mechanical properties are also presented. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 2650–2662, 2007
05 Nov 2007
TL;DR: In this article, a reactive routing protocol called energy aware routing is proposed to provide a reliable transmission environment with low energy consumption, which can monitor a specific area and collect environmental data around a place.
Abstract: Applications of sensor networks have become an emerging technology, which can monitor a specific area and collect environmental data around a place. In recent years, low power wireless communication and the availability of cheap and small micro sensor nodes lead to enhanced developments of wireless sensor network applications in real society. The energy constraint inherent in the small battery powered nodes presents a considerable problem, and much effort is being put into reducing the power consumption. We introduce a reactive routing protocol called energy aware routing that is intended to provide a reliable transmission environment with low energy consumption. This protocol efficiently utilizes both the energy available in the node and quality of the link to identify the best possible route to the destination. Simulation results show that the energy aware routing scheme outperforms the existing schemes even in the presence of high node density and overcomes simultaneous packet forwarding
TL;DR: In this paper, a model called Maintenance Quality Function Deployment (MQFD) has been developed to nourish the synergic power of QFD and total quality management (TPM) for converting customers' vague language into technical languages.
Abstract: Quality Function Deployment (QFD) is a technique used in the Total Quality Management (TQM) field for converting customers' vague language into technical languages. Total Productive Maintenance (TPM) is an approach being followed to achieve quality in maintenance engineering activities. In order to nourish the synergic power of QFD and TPM, a model called Maintenance Quality Function Deployment (MQFD) has been developed. One of the hallmarks of MQFD implementation is the consideration of factors such as customers, technology, competitors, etc. If MQFD implementation is to be successful among organisations with heterogeneous cultures, their critical factors have to be compared thoroughly. The technique 'Analytic Hierarchy Process' (AHP) helps to achieve this task. AHP carry out pairwise comparison and sensitivity analysis of various critical factors and subfactors considered in MQFD projects. A sample application study of implementing AHP in MQFD programme in a maintenance-intensive Indian automobile service station was carried out. The details are illustrated in the subsequent sections of the article.
TL;DR: The performance of filled fiber reinforced polymer composites is generally determined on the basis of the interface attraction of filler, fiber, and polymer as discussed by the authors, and the performance of the composite can be improved by adding a filler.
Abstract: The performance of filled fiber reinforced polymer composites is generally determined on the basis of the interface attraction of filler, fiber, and polymer. In the present investigation, the effec...
TL;DR: In this paper, the antimicrobial activity of RF oxygen plasma and Azadirachtin (neem extract) treated cotton fabric was investigated and the surface morphology has been studied using SEM micrographs.
TL;DR: In this paper, the possibility of recycling of reactive dye bath for dyeing of cotton fabric after decolouration using oxidation technique was assessed, and it has been found that effluents produced in Red 5MR and Golden Yellow MR can be recycled thrice.
TL;DR: In this paper, a study of modification of titanium boride (TiB) whisker distribution on the surfaces of Ti-TiB composites was performed using laser surface treatment, which corresponded to a substantial increase in surface volume fraction of TiB whiskers to about 67%, at such high energies.
TL;DR: This paper proposes a modification in the AFA algorithm with improved performance for speech signal processing and results showed that modification has improved performance in terms of signal-to-noise ratio compared to the original adaptive filtering algorithm.
Abstract: Adaptive filtering techniques are one of the important techniques used for noise cancellation in speech and biomedical signals. The Least Mean Squares (LMS) algorithm is one of the widely used algorithms in many adaptive signal processing environments. The adaptive filtering algorithm with averaging (AFA) algorithm is an improvement over the widely used Least Mean Squares (LMS) algorithm and has an improved performance. In this paper, we propose a modification in the AFA algorithm with improved performance for speech signal processing. The proposed modification was implemented in Matlab and was tested for noise cancellation in speech signals. The simulation results showed that modification has improved performance in terms of signal-to-noise ratio compared to the original adaptive filtering algorithm. Ill. 6, bibl. 8 (in English; summaries in English, Russian and Lithuanian).
TL;DR: In this article, the friction and wear characteristics of E-glass-epoxy (G-E) and graphite filler of three different levels in G-E composites were experimentally investigated using a pin-on-disc set-up at varied loads and sliding velocities.
Abstract: Polymeric composites have steadily gained importance in recent years for industrial applications. The increase in use calls for a better understanding of their behavior under different working environments. Friction and wear are considered two important parameters that govern tribological behavior. In this study, the friction and wear characteristics of E-glass-epoxy (G-E) and graphite filler of three different levels in G-E composites were experimentally investigated using a pin-on-disc set-up at varied loads and sliding velocities. From this investigation, it was found that a 7.5 wt% graphite filled G-E composite system showed least coefficient of friction and highest wear resistance compared to the plain G-E composite system, irrespective of the load/speed adopted. Besides conventional weighing, determination of coefficient of friction and examination of worn surface features were undertaken using a scanning electron microscope (SEM) for interpretation of wear behavior.
TL;DR: Experimental results prove that the proposed approach gives better classification rate under noisy environment than model based and feature based methods in terms of signal to noise ratio and classification rate.
Abstract: This article describes a new approach for image texture classification based on curve fitting of wavelet domain singular values and probabilistic neural networks. Image textures are wavelet packet transformed and singular value decomposition is then employed on subband coefficient matrices after introducing non-linearity. Lower singular values are truncated based on energy distribution to effectively classify textures in the presence of noise. The selected singular values are fitted to the exponential curve. The model parameters are estimated using population-sample analogues method and the parameters are used for performing classification. A modified form of probabilistic neural network (PNN) called weighted PNN (WPNN) is employed for performing the classification. Compared to probabilistic neural network, WPNN includes weighting factors between pattern layer and summation layer of the PNN. Performance of the approach is compared with model based and feature based methods in terms of signal to noise ratio and classification rate. Experimental results prove that the proposed approach gives better classification rate under noisy environment. © 2007 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 17, 266–275, 2007
TL;DR: To achieve the required depth of colour, the CIELAB values of the fabric to be dyed were predicted using trained feed-forward neural network developed for cotton fabric dyed with vinyl sulphone reactive dye.
TL;DR: In this paper, the authors explored the practical feasibility of adopting a Quality Circle Financial Accounting System (QCFAS) for analyzing the performance of 5S teams in a unit of a multinational abrasive manufacturing company operating in India.
Abstract: Purpose – The purpose of this paper is to explore the practical feasibility of adopting a Quality Circle Financial Accounting System (QCFAS) for analyzing the performance of 5‐S teams.Design/methodology/approach – First the literature was surveyed to study the state of the art of 5‐S. This study revealed the importance of analyzing the financial performance of 5‐S. Since, 5‐S contains tangible and intangible activities, it was decided to adopt the QCFAS to financially account it. The practical validity of this preposition was tested by conducting an implementation study in a unit of a multinational abrasive manufacturing company operating in IndiaFindings – The literature review led to the finding that 5‐S could be used as an interweaving device for conglomerating world class paradigms such as total quality management (TQM) and quality circles (QCs). The practical implementation study revealed the compatibility of employing QCFAS for financially accounting 5‐S teams.Research limitations/implications – The...