Thumbnail Image

Theses

Browse

End date: 2018 × Start date: 2015 × Thesis Type: M.Tech ×
Reset filters

Search Results

Now showing 1 - 9 of 224
  • Thumbnail Image
    ThesisItemOpen Access
    Mechanical and thermal characterization of ceramic thermoset composite
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Mohd. Sajid; Sah, P.L.
    In the present thesis work experimental investigation has been carried out to study the effect of mortar particles on mechanical and electrical properties. In this mortar particles at different wt% (0, 24, and 100) have been filled in epoxy resin and the effects of mortar particles on mechanical and thermal properties has been studied. Tests have been conducted on 100 kN servo-hydraulic universal testing machine under displacement mode of control and impact testing machine were used for mechanical testing and electrical conductivity have been studied by using Four Point Probe Conductivity Measuring system. Mechanical test results indicate that the mechanical property of the composite, compression strength with the variation in mortar particle first increases and then decreases. Nevertheless, the tensile strength and impact strength of the composite are decreased as the wt% of mortar particles increased. Electrical conductivity results indicate that it first get increases and then gets decrease as the wt% of mortar particles increased. On the basis of overall study the epoxy filling of 24 wt% of mortar particles is found to be better than other combinations.
  • Thumbnail Image
    ThesisItemOpen Access
    Simulation & comparison of various control strategies for BLDC motor and experimental analysis of BLDC motor using FPGA controller
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Singh, Pawan; Srivastava, Ajay
    Brushless DC (BLDC) motor belongs to the class of special electrical machines. Brushless DC motors offer many attractive features like low maintenance, good fault tolerant properties, fast response, noiseless operation, high efficiency, high power density, good reliability and compact construction. As a result, the brushless DC motors are increasingly being used in military, industrial and commercial applications. Its market is rapidly expanding. Since the development of motor, problems were encountered for variable speed but in last decade the continuing technological development in power electronics, microprocessors, adjustable speed drivers, semiconductor chips, have combined to provide reliable and efficient operation at varying loads and varying speeds. In BLDC motors the speed of motor drops with load so the prime objective of closed loop control is to maintain the motor speed constant irrespective of load changes. So closed loop is necessary in applications that demands better control and constant speed. The speed of the motor is fed back and compared with the reference speed continuously. Performance of BLDC motor depends on two factors. The performance of BLDC motor depends on two factors one is design of BLDC motor and second is the control strategies. Various types of control strategies have been proposed in the past for studying the behaviour of the BLDC motor during normal and transient periods. This thesis comprises of two parts. First part deals with simulation and comparison of various control strategies with reference to speed, torque and current response under different loading conditions at different speeds. Simulations were performed in MATLAB/Simulink software. Simulation results concluded that at rated speed, fastest speed control was achieved with PWM control strategy. Second part deals with experimental analysis of BLDC motor using FPGA controller in order to gain better understanding of motor performance and drive system. FPGA controller provided gate pulse for inverter switches based on PWM technique. For experimental analysis 1 HP Out-runner type BLDC motor was run at different speeds under different load and corresponding stator voltages, currents, power factor were measured with the help of FLUKE power logger and efficiency was calculated. Highest efficiency of 88.75 % was achieved at rated speed of 1800 RPM.
  • Thumbnail Image
    ThesisItemOpen Access
    Performance investigation of three phase induction motor drive by vector control strategy using Matlab/Simulink
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Sharma, Rahul; Swami, A.K.
    Vector Control or field orientation control (FOC) and Direct Torque Control are becoming the industrial standards for induction motor control. The FOC technique decouples the two components of stator current: one providing the control of flux and the other providing the control of torque. The flux as well as the torque level of the machine is controlled with perpendicular components of the stator current vector in the synchronously rotating reference frame (SRRF). Thus a current control loop is usually realized which controls the stator current and calculates the necessary inverter switching states. In Direct torque control to achieve the decoupling of flux and torque components, the flux and the torque errors are processed in hysteresis controller. The inverter switching states necessary to achieve the flux and torque levels are then directly obtained from a switching table with the stator flux angle as additional input. The motor torque and flux become direct controlled variables and hence, the name — Direct Torque Control. This thesis work gives a contribution for a detailed analysis of between the two control techniques, emphasizing upon the advantages and disadvantages respectively. The performance of the two control schemes is evaluated based on various criteria including the complexity of control and the dynamic performance. The dynamic response of FOC and direct torque control under various operating conditions such as no load, step load, fan load is simulated and examined in MATLAB 2016 environment.
  • Thumbnail Image
    ThesisItemOpen Access
    Design, development and performance evaluation of a family size biogas plant using alternate construction material
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Dey, Deeksha; Singh, R.P.
    Anaerobic digesters are assets for economic and clean biogas energy along with management of biodegradable waste like local biomass, agricultural waste etc. Biogas production in agriculture sector is a very fast growing market in developing countries and finds increased interest in many parts of the world. In India, net biogas production per year is about 2.07 billion m3. Different designs of biogas plants are available to provide biogas and fertilizer as residue. Beside, in hilly regions, inadequate production of biogas is experienced at a high cost of construction and installation. Thus, for optimum performance of biogas plant; design, operation efficiency and economic feasibility are vital factors to increase adaptation of small size domestic biogas plant in rural areas. Therefore, a family size biogas plant of capacity 0.5 m3 was designed at low cost of construction and ease of installation and operation. Also, its comparative analysis with conventional biogas plant like Pant RCC, Pant Tarai and prefabricated HDPE biogas plant was performed. All above biogas plants (fixed dome, floating drum and flexible type) were evaluated in three levels of temperature i.e. low, moderate and high. The study shows that daily biogas production per meter cube digester volume was higher in designed seamless HDPE sheet biogas plant as compared to Pant Tarai throughout the experiment. Also, daily biogas production per kg total solids for the designed seamless HDPE sheet biogas plant was comparable in mesophilic temperature range to other biogas plants. However, daily biogas production per kg volatile solids was higher for prefabricated HDPE biogas plant in mesophilic range with respect to other biogas plants. Methane content in biogas was highest of 68.86% in Pant RCC during mesophilic temperature. Further, cost analysis showed that lowest construction and installation cost of biogas plant as compared to Pant RCC, Pant Tarai, Deenbandhu, KVIC, prefabricated HDPE biogas plant was for the designed seamless HDPE biogas plant, both in planes as well as for hilly regions. Thus, flexible designs could be suggested for rural areas.
  • Thumbnail Image
    ThesisItemOpen Access
    Comparative evaluation of calibrated temperature-, and radiation-based ET0 equations developed for semi-arid climatic conditions based on standardized FAO56-PM model
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Bind, Shyam Murari; Tomar, A.S.
    The present study was undertaken to calibrate, validate and evaluate different temperature-, and radiation-based ET0 equations on daily, weekly, monthly, and seasonal (crop and weather) basis for semi-arid climatic conditions of Parbhani and Udaipur in comparison to standard FAO56-PM model with two specific objectives as, (i) to calibrate, validate and evaluate performance of various temperature-, and radiation-based ET0 equations in comparison to FAO56-PM model, and (ii) to calibrate and evaluate performance of all considered ET0 equations by using MicrosoftTM Excel Solver in comparison to FAO56-PM model. In this study, individual year was converted into 52 Standard Meteorological Weeks (SMWs), 12 months, three crop seasons (rabi, zaid and kharif) and three weather seasons (winter, summer and monsoon) in tune with CWS-1 format suggested by Indian Meteorological Department, Pune. The MicrosoftTM Excel was used as computing tool for conducting analysis and draw fruitful inferences from them. Prior to analysis, quality control of daily weather was also ensured by detecting missing data and outliers. The results showed that at all timescales, almost all calibrated ET0 equations performed well and extended better results in comparison to their original versions. Further, it was found that, calibrated Hargreaves-Samani M3 equation was found best at both places on daily, weekly, monthly, and weather season basis, while Hargreaves-Samani M1 performed best at both places on crop season basis. Among temperature-based ET0 equations, Romanenko equation was found worst at all timescales for both the places. Among radiation-based ET0 equations, Valiantzas (2) equation performed best while Irmak-Rn ET0 equation performed worst at all timescales for both places. Determination of calibration coefficient of different temperature- and radiation-based ET0 equations by using MicrosoftTM Excel Solver was found at-par in comparison of tedious and time-consuming MicrosoftTM Excel utility.
  • Thumbnail Image
    ThesisItemOpen Access
    Forecasting of daily reference evapotranspiration using artificial neural network, adaptive neuro-fuzzy inference system and multiple linear regression
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-07) Sah, Namrata; Kashyap, P.S.
  • Thumbnail Image
    ThesisItemOpen Access
    Design optimization and performance simulation of permanent magnet synchronous motor
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-07) Gope, Deepayan; Goel, S.K.
  • Thumbnail Image
    ThesisItemOpen Access
    Performance evaluation of fuzzy C mean and simulated annealing based clustering in WSN
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Awasthi, Shivangi; Mishra, P.K.
    Cluster based routing technique is most popular routing technique in Wireless Sensor Networks (WSNs). Due to varying need of WSN applications, efficient energy utilization in routing protocols is still a potential area of research. In this research work, focus is made on the optimization of clustering and to balance the load over the routes so that energy can be used effectively. The proposed work tried to overcome the problem of random distribution of clusters in LEACH. In this study, the optimization of clusters is made by using Fuzzy C Mean Clustering that gives uniformity in the cluster due to central tendency so that a uniform density can be seen in the participating clusters. To further distribute the load of transmitting data through a planned routing scheme Simulated Annealing is used. The performance of proposed work is evaluated on MATLAB by comparing it with some existing protocols.
  • Thumbnail Image
    ThesisItemOpen Access
    Experimental studies on double slope single basin solar still using absorbing materials
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Joshi, Ketan; Varshney, Lokesh
    Requirement of water is rapidly increasing due to increase in population and per capita increase in consumption rate of water in both industrial and domestic sector. This increased water demand leads to scarcity of water. Water bodies like rivers, lake, pond, well etc. have saline or brackish water that increases the problem to meet the increasing demand of potable water. By consumption of impure water many people suffer from waterborne diseases like cholera and jaundice. Thus need of the hour is to increase resources to supply fresh water. Several desalination techniques are employed in the past for desalination of saline or brackish water. Solar energy is a cheap and easiest way that can be used to obtain fresh water from the brackish or salty water to make it worth drinking and other purposes using solar stills. Solar still has many advantages over other desalination techniques. Operation of solar still is simple, cheap and requires less maintenance. The basic problem with solar still is its less productivity. Many attempts have been made to improve the efficiency of the solar still. Free surface area of water, water and glass cover temperature difference, absorber plate area temperature of inlet water, glass angle and depth of water are the various operating parameters, which affects the productivity of the solar still. Present research work is an approach to maximize the production rate by using absorbing materials (washed stones, black ink, jute cloth and cow dung cake) in such a manner that the area exposed to sunlight increases and storage of sensible heat during sunshine hours could be possible for production of clean water during off sunshine hours. Intermittent glass cover cooling is also provided as a modification in conventional solar still. Experiments are conducted for both combinations absorbing materials in the basin with no glass cover cooling and absorbing material in basin with intermittent glass cover cooling. Experiments are performed for different water depths (0.7 cm, 1 cm and 2 cm) in basin of the double slope single basin solar still. It is found that lower the water depth higher is production per day of fresh water. Results of the experiments revealed that due to placing the different absorbing materials in the basin and by intermittent cover cooling there is improvement in daily production rate. For washed stones in basin without intermittent cover cooling highest production is for 0.7 cm basin water depth having value of 4.012 L/m2 which is 12.07% more than that of conventional solar still. Water depth of 0.7 cm in basin and with intermittent cover cooling from outside of the glass cover produces 4.829 L/m2 potable water and conventional solar still produces 3.57 L/m2 potable water per day which is 35% more than that of conventional solar still. With washed stones and cover cooling the production rate of modified solar still is increased by 33% and 30% for 1 cm and 2 cm water depth, respectively as compared to that of conventional solar still under similar condition. For black ink in basin water, 0.7 cm water depth with glass cover cooling give best results among 0.7 cm, 1 cm and 2 cm water depths. Production of 4.794 L/m2 potable water per day with 0.7 cm water depth and glass cover cooling is received. For jute cloth dipped in basin water overall production observed is 4.7 L/m2. The production is for arrangement of 1 cm water depth with intermittent glass cover cooling. Overall production per day increased by 34% in modified solar still as compared to that of conventional solar still. For cow dung cake with water depth of 1 cm and 2 cm in basin production increased by 17% and 18%, respectively as compared to that of conventional solar still.