Showing papers by "PSG College of Technology published in 2013"
TL;DR: In this article, a robust linear quadratic regulator (LQR) was proposed to stabilize the pendulum in upright position and make the cart system to track the given reference signal even in the presence of disturbance.
138 citations
TL;DR: In this article, the free bending vibration of rotating axially functionally graded (FG) Timoshenko tapered beams (TTB) with different boundary conditions are studied using Differential Transformation method (DTM) and differential quadrature element method of lowest order (DQEL).
89 citations
TL;DR: In this paper, experiments were conducted by varying the drilling parameters and determining the optimum cutting conditions for drilling of CFRP/Ti stacks using genetic algorithm optimization technique and tool wear study was performed by drilling 100 holes each with 118° and 130° point angle drills.
88 citations
TL;DR: Experimental results show that welding using a Bezier horn has a high interface temperature and the welded joints had higher strength as compared to the other horn profiles.
81 citations
TL;DR: In this paper, an Ag/AgCl/TiO2 nanotube arrays electrode was employed for the photoelectrocatalytic (PEC) degradation of microcystin-LR (MC-LR) and found to be an effective visible-light-driven (VLD) PEC material.
78 citations
TL;DR: In this paper, a scaling law for models to carry out the free vibration analysis of structures, based on the similitude requirement, is presented. And the established scaling laws are validated analytically using simple test problems.
Abstract: Scaled down models are widely used for experimental investigations on huge structures due to the limitation in the capacities of testing facilities, and, moreover, the experimentation on scaled models is less expensive. Also small scale models are often built with materials dissimilar to those of the prototype. However, only few studies have been carried out on the similitude laws for the prototype structures with small scale models built with a different material. In the present study, an attempt has been made to develop a scaling law for models to carry out the free vibration analysis of structures, based on the similitude requirement. The established scaling laws are validated analytically using simple test problems. The similitude relationship between the prototype and the model is validated with the aid of a case study using finite element analysis software.
76 citations
TL;DR: In this paper, the stabilization and trajectory tracking of magnetic levitation system using PID controller whose controller gains are determined via Linear Quadratic Regulator (LQR) approach is considered.
75 citations
TL;DR: In this article, the free bending vibration of rotating axially functionally graded (FG) Euler-Bernoulli tapered beams (ETB) with different boundary conditions are studied using Differential Transformation method (DTM) and differential quadrature element method of lowest order (DQEL).
72 citations
TL;DR: In this paper, double cone drill design in terms of its tribological characteristics (i.e. friction, wear) are analyzed including cutting force, life, chip form and hole quality.
72 citations
TL;DR: In this article, textile electrodes have been designed and developed by embroidering conductive yarn on the polyester fabric to measure electrocardiogram biosignals of patients, and the results are compared with the commercially available disposable Ag/AgCl electrodes.
Abstract: Textile electrodes are a new and potential choice for long term and continuous monitoring of electrocardiogram measurements. In this research, textile electrodes have been designed and developed by embroidering conductive yarn on the polyester fabric to measure electrocardiogram biosignals of patients. Silver-coated nylon thread is embroidered on 100% polyester fabric in square form 11 mm × 11 mm with satin stitches in order to form three heart vectors (V3, V4, and V5). These electrodes are characterized based on electrode impedance and electrocardiogram measurement and the results are compared with the commercially available disposable Ag/AgCl electrodes. Further, additional tests have been performed using an electrode designed with 50% of the conductive thread used in the original sample. Real-time electrocardiogram signals, QRS-complex, P-wave, and T-wave were obtained for 10 subjects using existing hospital electrocardiogram equipment. The performance and repeatability of the electrode designed with 5...
62 citations
TL;DR: The results show that the NLNS Wiener filter produces better denoising results in terms of qualitative and quantitative measures compared with otherDenoising methods, such as classical Wiener Filter, the anisotropic diffusion filter, the total variation minimization and the nonlocal means filter.
TL;DR: In this article, an assessment model of Agile Supply Chains (ASC) using fuzzy logic approach is presented, which is encompassed with agile supply chain attributes whose performance levels need to be determined for assessing the overall ASC performance of the organization.
TL;DR: In this paper, an intelligent tool for screening candidates for recruitment using ontology mapping is presented, EXPERT, which has three phases in screening candidate for recruitment, in the first phase, the system collects candidates' resumes and constructs ontology document for the features of the candidates.
Abstract: Many e-recruitment tools for recruiting candidates for jobs have significantly spread in recent years. Companies often receive resumes from candidates using e-recruitment tools or via job portal for each job posting and manually short list qualified applicants. The existing e-recruitment tools have been mainly used for the storage of applicant contact data. In this paper, we present EXPERT, an intelligent tool for screening candidates for recruitment using ontology mapping. EXPERT has three phases in screening candidates for recruitment. In first phase, the system collects candidates' resumes and constructs ontology document for the features of the candidates. Job openings/job requirements are represented as ontology in the second phase and in third phase, EXPERT maps the job requirement ontology onto the candidate ontology document and retrieves the eligible candidates. Experiment results show that this model improves the accuracy of matching candidates with job requirement.
TL;DR: In this article, a review on RECOB and RECB crystals is presented along with a discussion on our attempts to grow yttrium calcium oxy borate Y2CaB10O19 (YCB) and lanthanum calcium borate LaCa4O(BO3)3 (LCOB).
TL;DR: In this article, an AlSi10Mg alloy reinforced with 3, 6 and 9 wt-% alumina with constant 3 wt% graphite particles was produced by stir casting technique.
Abstract: Aluminium metal matrix composites are among the recent developments in engineering applications to meet the present day need of light weight, high strength/weight ratio and good wear properties. In the present study, AlSi10Mg alloy reinforced with 3, 6 and 9 wt-% alumina with constant 3 wt-% graphite particles was produced by stir casting technique. Microstructural investigations as well as evaluation of mechanical properties such as hardness, tensile strength and double shear strength were conducted on composites and unreinforced alloy specimens. Tribological behaviour of hybrid composites was studied using pin on disc test machine. Wornout surfaces were analysed using scanning electron microscopy, and wear debris were analysed using X-ray diffraction. Results revealed that the mechanical properties of hybrid composites were higher than unreinforced alloy. Dry sliding wear test results indicated that the aluminium alloy reinforced with 9 wt-% alumina and 3 wt-% graphite has highest wear resistance compar...
TL;DR: In this paper, the dry sliding wear behavior of the composites in the cast conditions is examined using the pin-on-disc tribotesting machine for three different loads (20, 30, and 40 N) with three different sliding velocities (2, 3, and 4 N).
Abstract: Rice husk ash of three different particle size ranges (50–75, 75–100 and 100–150 μm) a 3, 6, 9, and 12% by weight is reinforced with an aluminum alloy (AlSi10Mg) using the liquid metallurgy method. The dry sliding wear behavior of the composites in the cast conditions is examined using the pin-on-disc tribotesting machine for three different loads (20, 30, and 40 N) with three different sliding velocities (2, 3, and 4 m/s). The results reveal that the composite reinforced with the coarse rice husk ash particles exhibits superior wear resistance compared to the fine rice husk ash particles. The wear rate of the composite decreased with an increase in the weight percentage of rice husk ash particles for all size ranges. Finally, the wear mechanism was investigated with the worn surface using a scanning electron microscope.
TL;DR: Kinetic study indicated that the degradation of PNP at BDD and Pt anodes followed pseudo-first-order reactions, and the reaction rate constant (k(s)) of the former was observed to be higher than that of the latter, which was ascribed to the formation of refractory chlorinated organic compounds.
TL;DR: In this article, the performance parameters are analyzed with the developed prototype of the three phase cascaded multilevel inverter for solar energy conversion designed with digital controller for reduced power quality issues with three phase AC motor drive.
TL;DR: In this article, the free vibration of axially functionally graded (FG) non-uniform beams with different boundary conditions is studied using Differential Transformation (DT) based Dynamic Stiffness approach.
Abstract: The free vibration of axially functionally graded (FG) non-uniform beams with different boundary conditions is studied using Differential Transformation (DT) based Dynamic Stiffness approach. This method is capable of modeling any beam (Timoshenko or Euler, centrifugally stiffened or not) whose cross sectional area, moment of Inertia and material properties vary along the beam. The effectiveness of the method is confirmed by comparing the present results with existing closed form solutions and numerical results. In FG beams, flexural rigidity and mass density may take majority of functions including polynomials, trigonometric and exponential functions (converted to polynomial expressions). DT based Dynamic stiffness approach is proved to be a versatile and simple approach compared to many other methods already proposed.
TL;DR: A hitherto uninvestigated ligno-cellulosic seed fiber from the plant Pergularia daemia has been chosen for the current study to unravel its physical properties, and potentialities in textile applications as discussed by the authors.
Abstract: A hitherto uninvestigated ligno-cellulosic seed fiber from the plant Pergularia Daemia has been chosen for the current study to unravel its physical properties, and potentialities in textile applications. The raw, NaOH treated, and wax removed fibers were tested for their morphological and structural features by X-ray diffraction, SEM, FT-IR spectra, and thermal analysis by thermogravimetry and differential scanning calorimetry. The raw fibers have low cellulose content and less crystalline compared to cotton and are having hollow, smooth surface, and less density. The brittle nature and low elongation at break of virgin fiber makes it difficult for the spinning. It becomes spinnable after NaOH treatment due to the increased elongation at break by partial removal of lignin.
TL;DR: In this article, chitosan was applied on to the braided silk sutures at three different concentrations and the effects of the coating on the characteristics of the suture were investigated.
Abstract: In the present work, chitosan was applied on to the braided silk sutures at three different concentrations and the effects of chitosan coating on the characteristics of braided silk suture were exp...
TL;DR: In this article, a nanocrystalline TiO2 dye-sensitized solar cells have been fabricated using the extracts of red rose and table rose as natural sensitizers and their characteristics have been studied.
Abstract: Nanocrystalline TiO2 dye-sensitized solar cells have been fabricated using TiO2 photoelectrode sensitized using the extracts of red rose and table rose as natural sensitizers and their characteristics have been studied. The extracts having anthocyanin pigment (pelargonidin, peonidin and cyanidin), which have hydroxyl and carboxylic groups in the molecule can attach effectively to the surface of TiO2 film. The solar cell constructed using the red rose sensitized TiO2 photo-electrode exhibited a short-circuit photocurrent of 4.57 mA/cm2 and a power conversion efficiency of 0.81 % and that of table rose sensitized TiO2 photo-electrode exhibited a short-circuit photocurrent of 4.23 mA/cm2 and a power conversion efficiency of 0.67 %. Natural dye sensitized TiO2 photo electrodes present the prospect to be used as an environment-friendly, low-cost alternative system.
TL;DR: In this paper, metal wire based single jersey knitted fabrics were produced in different construction to study the electromagnetic shielding characteristics of single jersey fabrics, and bare silver coated copper wire was used.
Abstract: Metallic wire based single jersey knitted fabrics were produced in different construction to study the electromagnetic shielding characteristics. In one construction, bare silver coated copper wire...
TL;DR: A new filtering method based on neutrosophic set (NS) approach of wiener filter is presented to remove Rician noise from magnetic resonance image to produce better denoising results compared with other Denoising methods.
Abstract: In this paper, a new filtering method based on neutrosophic set (NS) approach of wiener filter is presented to remove Rician noise from magnetic resonance image. A neutrosophic set, a part of neutrosophy theory, studies the origin, nature and scope of neutralities, as well as their interactions with different ideational spectra. Now, we apply the neutrosophic set into image domain and define some concepts and operators for image denoising. The image is transformed into NS domain, described using three membership sets: True (T), Indeterminacy (I) and False (F). The entropy of the neutrosophic set is defined and employed to measure the indeterminacy. The ω-wiener filtering operation is used on T and F to decrease the set indeterminacy and remove noise. The experiments have conducted on simulated Magnetic Resonance images (MRI) from Brainweb database and clinical MR images corrupted by Rician noise. The results show that the NS wiener filter produces better denoising results in terms of visual perception, qualitative and quantitative measures compared with other denoising methods, such as classical wiener filter, the anisotropic diffusion filter, the total variation minimization scheme and non local means filter.
TL;DR: In this paper, the use of fly ash and graphite particles as low cost reinforcing materials for improved wear resistance, enhanced mechanical properties and reduction in density of hybrid composites was explored.
Abstract: Purpose – The purpose of this paper is to explore the use of fly ash and graphite particles as low cost reinforcing materials for improved wear resistance, enhanced mechanical properties and reduction in density of hybrid composites. Design/methodology/approach – The AlSi10Mg/fly ash/graphite (Al/FA/Gr) hybrid composite was synthesised by stir casting method. The dry sliding wear and friction behaviour of hybrid composites were studied using pin-on-disc machine by varying parameters like load and weight fraction of fly ash, and compared with the base metal alloy and aluminium-graphite composite. The tests were conducted with a constant sliding speed of 2 m/s and sliding distance of 2,400 m. Findings – The hybrid composites exhibit higher hardness, higher tensile strength and lower density when compared to unreinforced alloy and aluminium-graphite composite. The incorporation of fly ash and graphite particles as reinforcements caused a reduction in the wear rate and coefficient of friction (COF) of the hyb...
TL;DR: A wet chemical approach was used to synthesis HAp-chitosan-gelatin nanocomposites and it was inferred that particle size, morphology, resorbability and hardness of the composite can be altered by tuning the composition.
TL;DR: A new high capacity Steganographic scheme using 3D geometric models that re-triangulates a part of a triangle mesh and embeds the secret information into newly added position of triangle meshes with high capacity and low distortion rate.
Abstract: This paper proposes a new high capacity Steganographic scheme using 3D geometric models. The novel algorithm re-triangulates a part of a triangle mesh and embeds the secret information into newly added position of triangle meshes. Up to nine bits of secret data can be embedded into vertices of a triangle without causing any changes in the visual quality and the geometric properties of the cover image. Experimental results show that the proposed algorithm is secure, with high capacity and low distortion rate. Our algorithm also resists against uniform affine transformations such as cropping, rotation and scaling. Also, the performance of the method is compared with other existing 3D Steganography algorithms.
TL;DR: This paper proposes a novel idea of pruning ensemble using Harmony search which is a music inspired algorithm and achieves high detection accuracy and outperforms the existing ensemble algorithms.
TL;DR: In this article, the effect of reinforcements and machining parameters such as cutting speed, feed rate, and depth of cut on surface roughness, which greatly influence the performance of the machined product, were analyzed during turning operation.
Abstract: This paper presents an experimental investigation on the surface roughness of pure commercial Al, Al-15 wt% fly ash, and Al-15 wt% fly ash/1.5 wt% graphite (Gr) composites produced by modified two-step stir casting. The effect of reinforcements and machining parameters such as cutting speed, feed rate, and depth of cut on surface roughness, which greatly influence the performance of the machined product, were analyzed during turning operation. The optimum machining parameters were found in minimizing the surface roughness of the materials by using the Taguchi and ANOVA approach. Results show that the presence of the fly ash particles reduces the surface roughness of composites compared with pure Al. The inclusion of 1.5 wt% Gr in the Al-fly ash composite reduces the surface roughness considerably. A scanning electron microscopy investigation was carried out on the machined surfaces of the tested materials. Confirmation tests were performed to validate the regression models.
TL;DR: The cardanol formaldehyde resin (CFR) has been synthesized by the condensation of cardanol with formaldehyde (ratio of 1:0.7) in the presence of oxalic acid catalyst.
Abstract: The cardanol formaldehyde resin (CFR) has been synthesized by the condensation of cardanol with formaldehyde (ratio of 1:0.7) in the presence of oxalic acid catalyst. Synthesized CFR was epoxidized using epichlorohydrin (ECH) with 1:10 molar ratio. Cardanol was also directly epoxidized using ECH with the above-mentioned ratio. Synthesized resins have been characterized by Fourier-transform infrared and nuclear magnetic resonance spectroscopic analyses. Thermal properties have been studied by thermogravimetric analysis. Decomposition kinetics have been studied by various kinetic models of the synthesized compounds. In the present study, Horowitz–Metzger, Broido and Coats–Redfern models have been used to calculate the activation energy (Ea), pre-exponential factor (A) and rate constant (K). Ea calculated from all the three models mentioned above was close to each other.