Browsing by Author "Kumar, T.A."

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    Comparison of model study with field implementation of gravity blind backfilling method to control subsidence induced disaster in abandoned underground coal mines
    (World Researchers Associations, 2023) Kumar, P.S.; Akhil, A.; Kumar, T.A.
    Blind hydraulic backfilling technique is used for subsidence control in underground coal mines. A laboratory size model of underground working was developed to understand backfilling process. Observations from model were utilized for backfilling process in one of the underground mines. This study describes the results obtained in the field investigation at an old abandoned waterlogged underground coal mine of Eastern Coalfields Limited (ECL), a subsidiary of Coal India Limited and their verification with the findings obtained in the laboratory scale model study carried out on a model of underground coal mine worked by board and pillar method. The relative influence of slurry concentration and flow rates on the areas of filling from a single inlet borehole has been discussed. The relative spread of sand in different directions has also been measured using a remotely operated underground vehicle mounted camera. The empirical relationships developed under field conditions have been found to be similar to those of laboratory model. © 2023, World Research Association. All rights reserved.
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    Parametric Analysis of Mine Bench Blasting using High Speed Video Camera
    (World Researchers Associations, 2025) Channabassamma, N.; Akhil, A.; Rama, S.V.; Kumar, T.A.; Sahana, P.
    This study presents a comprehensive parametric analysis of mine bench blasting through the utilization of high-speed video camera technology. Mine bench blasting is a critical operation in the extraction of minerals and understanding its parameters is essential for optimizing safety, efficiency and environmental impact. The research employs a high-speed video camera, specifically the S-Motion Model by AOS Technologies, Switzerland, capable of recording at 1000 frames per second. Here we carried out the sensitive parametric analysis like dependency of burden rock movement on ejection of stemming gaseous, stemming ratio, stemming height and total explosive charge using Proanalyst image processing software. Through the analysis, we identified key trends and correlations that contribute to control rock movement, stemming gas ejection and optimizing explosive charge distribution. This comprehensive understanding provides valuable insights for improving the overall effectiveness and precision of future blasting operations, thereby contributing to enhanced operational outcomes and safety in mining or construction activities. © 2025, World Researchers Associations. All rights reserved.
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    Performance Analysis of Novel Multilevel Inverter with Minimum Number of Switching Components
    (Institute of Electrical and Electronics Engineers Inc., 2023) Kumar, T.A.; Yellasiri, Y.; Nageswar Rao, B.N.; Aditya, K.; Shiva Naik, B.S.; Karunakaran, E.
    The immense growth in Multilevel inverters are a great development for industrial and renewable energy applications due to their dominance over conventional two-level inverters concerning size, rating of switches, filter requirement, and efficiency. According to the current topology, the multilevel inverter employing the bidirectional converter is a DC connection that serves as the bidirectional inverter's input power. The bidirectional inverter is configured to output a voltage with several levels by altering the voltage with the bidirectional converter. Also, because there is no need for a low-frequency transformer or an LC filter at the output stage of the multi-level inverter in the present topology, the frequency does not pose any difficulties. In comparison to other traditional topologies, using an asymmetrical multilevel inverter architecture employs fewer switching components to create greater levels. This study proposes a 27-level multilevel inverter with fewer switching components. To validate the technique, the simulation results are shown. © 2023 IEEE.
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    Performance analysis of PV panel under varying surface temperature
    (2018) Kumar, T.A.; Murthy, Ch.S.N.; Mangalpady, A.
    The surface temperature of PV panel has an adverse impact on its performance. The several electrical parameters of PV panel, such as open circuit voltage, short circuit current, power output and fill factor depends on the surface temperature of PV panel. In the present study, an experimental work was carried out to investigate the influence of PV panel surface temperature on its electrical parameters. The results obtained from this experimental study show a significant reduction in the performance of PV panel with an increase in panel surface temperature. A 5W PV panel experienced a 0.4% decrease in open circuit voltage for every 1�C increase in panel surface temperature. Similarly, there was 0.6% and 0.32% decrease in maximum power output and in fill factor, respectively, for every 1�C increase in panel surface temperature. On the other hand, the short circuit current increases with the increase in surface temperature at the rate of 0.09%/�C. � The Authors, published by EDP Sciences, 2018.
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    Thermal Conductivity Assessment in Limestone Rocks: Unveiling Patterns through P-Wave Velocity, Uniaxial Compressive Strength and Mineral Composition
    (World Researchers Associations, 2025) Dileep, G.; Kumar, T.A.; Murthy, C.S.N.; Labani, R.; Kumar, P.S.
    Rock thermal conductivity is a critical property in the building and construction industry, playing a key role in optimizing energy efficiency. It guides material selection for insulation and ensures effective resistance to heat transfer within structures. This study introduces an alternative approach for estimating the thermal conductivity of rocks using an indirect method. The proposed approach leverages P-wave velocity, uniaxial compressive strength and mineral composition as predictive parameters. This study examines the relationship between thermal conductivity and key rock properties, including P-wave velocity, uniaxial compressive strength and quartz content. A significant positive correlation was identified, highlighting the potential of these parameters as reliable predictors for estimating the thermal conductivity of rocks. © 2025, World Researchers Associations. All rights reserved.