Conference Papers
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Item Microseismic monitoring of longwall strata to provide real time instability indications to mine management at Rajendra coalmine in India(2008) Sivakumar, C.; Srinivasan, C.; Murthy, Ch.S.N.; Rao, Y.V.Rooffalls are the most common problems encountered during various stages of longwall mine operation resulting in loss of production and machinery. A real time microseismic monitoring system was installed at Rajendra underground coal mine and acquired rock fracturing information from different roof layers. These data were analysed and obtained stress concentration zones, which ultimately resulted in rooffalls. Based on the microseismic event release rate advanced strata instability information was provided to mine management through daily reports. This information has helped in carrying out effective and optimized blasting operations to distress the high stress zone. The microseismic data also helped in mapping real time fracture process to get the extent of fractures in roof strata. The significant and reliable precursor found was microseismic event release rate (ERR) for rooffalls. Daily reports were submitted to mine management regarding stress concentration zones and rockfall information, which were confirmed from underground observations. The details of the microseismic technique and its application to longwall mine problems are discussed in this paper. © 2008, ARMA, American Rock Mechanics Association.Item Real time microseismic monitoring to study geomechanics of underground structures(2008) Sivakumar, C.; Srinivasan, C.; Willy, Y.A.; Murthy, Ch.S.N.The study of Geomechanics of underground structures in real time requires capture of fracture information well in advance from structure failure to initiate remedial measures during development and after completion of structure. The advanced high dynamic range microseismic instrumentation with latest Computer methods/algorithms helped to investigate strata behaviour in real time. One such investigation was carried out at the Rajendra longwall underground coal mine, Madya Pradesh state India and addressed major concerns of the mines like roof falls, stability of workings, goaf caving process etc,. The results of this study demonstrated that microseismic monitoring is very useful in understanding the geomechanics of underground structures. Among the several seismic source parameters obtained, the reliable precursor found was the microseismic Event Release Rate (ERR) of micro fractures before failure, which is the most significant instability indicator of underground structure. Results from this work can be useful to other underground structures such as tunnels and LPG storage caverns.Item Effect of thermal response on physical properties during drilling operations-A case study(Elsevier Ltd, 2018) Vijay Kumar, S.; Murthy, Ch.S.N.; Kunar, B.M.The temperature induced or generated during deep hole drilling operations is due to the heat generated between the interface of work piece surface and the tool surface. Several research study have been conducted to predict the temperature involved while drilling process as a predominant functions of many parameters like feed rate, torque, depth of cut etc. Similarly many experimental procedures have been conducted by several researchers to measure temperature directly by using thermocouples, infrared measurement, pyrometer, and thermisters etc. There is no precise experimental method is available to measure analytical value of energy, power, heat flux etc, while drilling process. The temperature rigma depends on material compositions and physical properties. This paper presents the influence of temperature on physical properties of some study samples during drilling operations. © 2017 Elsevier Ltd.Item Performance analysis of PV panel under varying surface temperature(EDP Sciences edps@edpsciences.com, 2018) Tripathi, T.A.; Murthy, Ch.S.N.; Mangalpady, M.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.Item Investigation on rock thermal properties in Godavari Valley Coalfield, Telangana, India(CRC Press/Balkema, 2024) Dileep, G.; Tripathi, A.K.; Murthy, Ch.S.N.; Ray, L.The study of thermal properties provides significant contributions to the field of geothermal research, material characterization, geological assessments and optimization of heat load in underground mines. The research focuses on the examination of thermal properties in rocks, specifically sandstone, aiming to explore the correlation between thermal properties with density and porosity. The investigation on sandstone rocks within the Godavari coal basin coal mines employed a steady-state instrument to measure thermal properties. The rocks exhibit notable variations in thermal conductivity (ranging from 1.10-4.38 W/m.K) and thermal diffusivity (ranging from 0.63-1.96 J/kg.K), which are substantially influenced by changes in both porosity (ranging from 0.6-19%) and density (ranging from 2.13-2.68 g/cm3). The research findings indicate that in sandstone rocks, thermal conductivity and thermal diffusivity rise with increasing density and decline with porosity. In contrast, the specific heat capacity of rocks remains constant. © 2024 The Author(s).Item Bifacial Solar PV Systems: A Sustainable Solution for Energy-Intensive Industries(Institute of Electrical and Electronics Engineers Inc., 2024) Bojja, S.K.; Kunar, B.M.; Murthy, Ch.S.N.Energy-intensive industries and mineral-based industries demand a considerable quantity of power for numerous uses. This is a big challenge because these procedures need a continuous and constant energy source, which requires an uninterrupted power supply. In theory, industries complement, replace, or lessen the effects of using fossil fuels by utilizing renewable energy, carbon capture, and energy recovery. However, combining renewable energy sources, such as solar power, can significantly lower overall operating costs and carbon emissions to meet the energy needs of different industrial applications. This study describes the installation, for research purposes, of a prototype bifacial solar PV system (BSPV) equipped with a pumping motor. A BSPV system is being investigated because its output energy will be higher than that of monofacial solar cells. BSPV systems use less space than monofacial ones while still producing the same power and being less expensive as well. © 2024 IEEE.