Digital Eprints Services at Vignan's Foundation for Science, Technology & Research
Not a member yet
721 research outputs found
Sort by
Design Optimization of Drive Shaft For An Automobile Application
No full textThe driveshaft is a mechanical instrument that is used in automobiles. The other name of the drive shaft is driveshaft is prop shaft. It has one long cylindrical structure consist of two universal joints. By using the driveshaft it transfers the rotary
motion to the differential by using the helical gearbox. By using this rotary motion the rare wheels will run. The 3dimensional Model of automobile drive Shaft is designed using CATIA parametric which enables product development processes and thereby brings about an optimum design. Now a day’s steel is using the best material for the driveshaft. In this paper
replacing the composite materials (Kevlar, e-glass epoxy) instead of steel material and it reduces a considerable amount of weight when compared to the conventional steel shaft. The composite driveshaft have high modulus is designed by using CATIA software and tested in ANSYS for optimization of design or material check and providing the best dateboo
Internal heat generation on bioconvection of an MHD nanofluid flow due to gyrotactic microorganisms
Get PDFThe principal aim of this paper is to analyse the two-dimensional magnetohydrodynamic flow and heat and mass transfer phenomena of water-based nanofluid containing
gyrotactic microorganisms over a vertical plate by means of heat generation or absorption. Set of nonlinear ordinary differential equations are derived from the governing partial differential equations of the two-dimensional flow of MHD nanofluid and nanoparticles by utilizing appropriate similarity ransformations. The numerical results are obtained with the proposed
novel spectral relaxation method. The results revealed that in the heat and mass transfer, the motile microorganism flux rates as well as the velocity profiles are decreased throughout
the fluid medium with the impact of magnetic field strength. Moreover, the drag stress rate and motile microorganism profiles are increased with the enhancement of magnetic field.
Even though the problem of nanofluid has been broadly investigated, limited discoveries can be found through a gyrotactic microorganisms. Indeed, this paper managed to obtain the numerical analysis is performed. Furthermore, the authors also considered the MHD phenomena, heat generation or absorption effects. Very few studies in the fluid with gyrotactic microorganisms embedded in this parameter in their problem
Efficacy of biochar in removal of organic pesticide, Bentazone from watershed systems
No full textThe efficacy of the biochar produced from waste biomass for removal of Bentazon, one of the most toxic insecticide used to control forest tent caterpillar moths, boll weevils, gypsy moths, and other types of moths in various field crops is investigated. Char was produced by pyrolysis process under limited oxygen conditions at different temperatures and was characterized by proximate and ultimate analysis, SEM analysis, FTIR analysis, TG/DTA analysis etc. Adsorption capacity of the same was assessed in removing the Bentazon from aqueous solutions. Effect of time, adsorbent dosage, pH and Initial insecticide concentration on the adsorption capacity of the biochar produced was discussed. The optimum values are obtained by CCD (Central Composite Design) using desirability function. This study indicated that the biochar produced from the waste biomass could be a potential source for removing synthetic organic pollutants from the water streams
Low Velocity Impact and Internal Pressure Behaviors of Unaged E-Glass and S-Glass/Epoxy Composite Elbow Pipe Joints
Get PDFThis experimental analysis studies the consequences of impact loading on the impact performance and monotonic burst pressure on the level of leakage after impact of E- and S-glass/epoxy composite pipe joints. First, impact tests with three dissimilar energy points (10, 12.5, and 15 J) were applied on composite elbow pipe joints at room temperature, followed by burst pressure tests. Scanning electron microscopy pictures were taken, and the relationship between levels of impact energy on the pipe joints with burst strength was recognized. The results of proposed S-glass/epoxy composite elbow pipe joints were more prominent when were matched with that of a reference specimen, an E-glass/epoxy composite elbow pipe joint. This research proposes a new perspective that impact strength depends upon the increase in time of impact and type of material used
Modeling of kerf width and surface roughness in Wire cut EDM of Ti-6Al-4V
No full textSurface roughness and kerf width are the two challenging quality characteristics in wire cut electric discharge machining
(WEDM) of Ti-6Al-4V to improve accuracy in machining. In this study, effect of wire displacement on the kerf width and
surface roughness is studied in WEDM of Ti-6Al-4V. Mechanistic models are developed for kerf width and surface roughness using amplitude and frequency of wire vibration in X and Y directions. Amplitude and frequency of wire displacement in X and Y directions are directly measured using an accelerometer at different working conditions. The estimated kerf width and surface roughness are compared with the experimental results and the average error between them is found to be 3.7 and 4.2% respectively. The results showed that the current and wire tension have significant effect on the wire displacement. The kerf width and surface roughness are effected more by the applied current and the metal removal rate is effected by current and pulse on time. A working condition with 3.3 A of current, 15 N of wire tension, 14.4 ms of pulse on time and 41.5 ms of pulse off time is found to be an optimum working conditio
Studies on cryogenically treated WC-Co insert at different soaking conditions
No full textTool wear and tool replacement significantly increases the machining time and subsequently increase the production cost. To enhance tool life, various surface modification techniques are adopted such as nitriding, hard coating, heat treatments, cyaniding, etc. In the present study, the tungsten carbide-cobalt
(WC-Co) cutting tool is treated cryogenically at −196°C with the different soaking periods of 24, 48 and 72 h. The performance characteristics of the treated cutting tool are measured on Al6063 under turning operation at various machining conditions and the results are compared with untreated tools. An
experimental design with Cutting velocity, depth of cut and feed rate as machining parameters have been evaluated, with roughness and tool wear rate as the output variables of the study. Minimum tool wear and acceptable level of surface finish are observed on cryogenically treated inserts and Al6063,
respectively. An increase in the soaking period in a deep cryogenic environment leads to having excess tool wear and subsequently affects the surface finish. Twenty-four hours and 48 h deeply cryo-treated insert exhibits fine microstructural observation which reveals the formation and distribution of η carbide particles, in turn, results in improved hardness and wear resistance. The conformity of the above results is ensured through Vickers micro-hardness and surface morphological studies
An adaptive PID control algorithm for the two-legged robot walking on a slope
No full textThe crux in designing the PID controller lies in determining its gain values, which play a major role in deciding its
performance. The gains are fed as inputs to the controller and are to be decided before its run. On the other hand, the
effectiveness of the biped walk purely depends on the performance of the PID controller. Initially, the upper and lower
body gaits of the two-legged robot are determined using the concept of inverse kinematics. Further, the dynamics of the
biped robot is derived by using Lagrange–Euler formulation. The main objective of the present research is to decide the
gains of the torque-based PID controller with the help of a neural network trained by using nature-inspired optimization
algorithms, namely MCIWO and PSO. The adaptiveness of the algorithm lies in modifying the gains of the controller based
on the magnitude of the error in the angular displacement received at the input to the NN. Once the controller is developed, its effectiveness is tested in computer simulations. Finally, the optimum controlled gait angles obtained by the best
approach are tested on a real biped robot
Quality Characteristics of Ground Waters in Few Sources of Industrial Zone
No full textThe Population growths along with rapid industrialization and strain on civic services have been major causes for environmental degradation globally, especially many
of surface and subsurface water bodies gets polluted by rapid
industrialization and urbanization, usage of chemical fertilizers
in agriculture practices, untreated sewage, industrial effluents,
etc., and in addition of lack of public awareness may all cause
damage to the quality characteristics i.e. physio-chemical changes in water environs. The ground water quality deteriorating due to seepage of pollutants from various polluted water bodies, like ponds, lakes and runoff, etc. Here an attempt is made to know the quality characteristics in the ground water at Auto Nagar area of Guntur by the Water Quality Index (WQI) with the parameters of pH, Chlorides, TDS, Total Hardness, Ca Hardness, Nitrates, Sulphates, Iron, Dissolved Oxygen and it was found that quality ranges of WQI from 37 to 90, which is a satisfactory quality for domestic utilization of ground water resource
Characterization Of Materials For Customized Afo Using Additive Manufacturing
No full textNeurodegenerative conditions and compressed nerves often cause an abnormal foot drop that affects an individual gait and make it difficult to walk normally. Ankle Foot Orthosis (AFO) is the medical device which is recommended for the patients to improve the walking ability and decrease the risk of falls. Custom AFOs provide better fit, comfort and performance than pre-manufactured ones. The technique of 3D-printing is suitable for making custom AFOs. Fused deposition modelling (FDM) is a 3D-printing method for custom AFO applications with the
desired resistance and material deposition rate. Generally, FDM is a thermal process; therefore materials thermal behaviour plays an important role in optimizing the performance of the printed parts. The objective of this study is to evaluate the
thermal behaviour of PLA, ABS, nylon and WF-PLA filaments before manufacturing the AFO components using the FDM method. In the study, the sequence of testing materials provides a basic measuring method to investigate AFO device parts
thermal stability. Thermal analysis (TG/DTG and DSC) was carried out before 3D printing is to characterize the thermal stability of each material
A Novel Work Table Design For Turning In Abrasive Water Jet Machine
No full textAbrasive water jet had proven to be a suitable unconventional machine technique for cut-through operation. Using abrasive water jet turning only limited studies are available. Apart from usual machining practice in Abrasive Water Jet Machine (AWJM), the installation of the chuck with motor assembly as a unit similar set up like conventional lathe machine will enhance the machinability of AWJM. From the earlier studies, it is understood that the author has performed the machinability studies using this experimental set up in AWJM. But no standard
procedure is described as the installation procedure of chuck and motor assembly in AWJM. Considering this, a review is conducted on the design and implementation of turning setup in an abrasive water jet machine. Based on the acquired knowledge through a literature survey and also, considering vibration, assembly, and safety factors, a new design is proposed. The author ensures that implementing this setup in
an abrasive water jet machine will enhance the research work to a higher level of significance