Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Failure rate and reliability of the KOMATSU hydraulic excavator in surface limestone mine(American Institute of Physics Inc. subs@aip.org, 2018) N. S., N.S.; Choudhary, R.P.; Murthy, C.S.N.The model with failure rate function of bathtub-shaped is helpful in reliability analysis of any system and particularly in reliability associated privative maintenance. The usual Weibull distribution is, however, not capable to model the complete lifecycle of the any with a bathtub-shaped failure rate function. In this paper, failure rate and reliability analysis of the KOMATSU hydraulic excavator/shovel in surface mine is presented and also to improve the reliability and decrease the failure rate of each subsystem of the shovel based on the preventive maintenance. The model of the bathtub-shaped for shovel can also be seen as a simplification of the Weibull distribution. © 2018 Author(s).Item Mineralogical studies of low grade iron ore from Bellary-Hospet region, India(American Institute of Physics Inc. subs@aip.org, 2019) Mohanraj, G.T.; Krishneindu, P.; Choudhary, R.P.; Meena, S.S.; Yusuf, S.M.; Rahman, M.R.Detailed mineralogical characterization study has been conducted on low grade iron ore sample from Bellary-Hospet region, Karnataka, India by using XRD, optical microscopy and Mössbauer spectroscopy techniques for identifying the eminence of iron ore sample. Liberation analysis was carried out by particle size analysis and specific gravity measurement. Chemical analysis results showed that, -125+90μ size fraction assaying up to 57.34% Fe, 8.55% SiO 2 and 8.6% Al 2 O 3 . XRD analysis revealed the presence of major hematite phase along with kaolinite, gibbsite, quartz and goethite in the sample. Microscopic study confirms the transformation of magnetite to hematite by martitization. Mössbauer spectrum reveals the existence of hematite α-Fe 2 O 3 phase with small distortion in crystal structure. © 2019 Author(s).Item Evolution of the Probability Distribution Function of Shovel – Dumper Combination in Opencast Coal Mine Using ANN and RWB(Springer Nature, 2020) N. S., N.S.; Choudhary, R.P.; Murthy, C.S.N.This article presents a new analytic calculation for the shovel – dumper combination in opencast coal mine evolution of the one and two galaxy probability distribution function (PDF). To develop a nonparametric PDF for a combination of shovel and dumper in a opencast coal mine, the historical breakdown data such as time between failure (TBF) of a shovel and dumpers were collected from the mine. Based on the collected TBF, Weibull parameters such as the shape parameter (β), scale parameter (η) and location parameter (γ) were calculated under the K-S test (Kolmogorov–Smirnov test). A Weibull distribution model has been developed to obtain the one and two galaxy probability distribution function (PDF) for a collected failure data of shovel-dumper system using Reliability Isograph Workbench (RWB). Also, Artificial Neural Network (ANN) model has been developed to predict the PDF for the same shovel-dumper system and compared with the actual obtained value of Reliability Isograph Workbench (RWB). It was found that the values of RMSE and R2 were 0.00068 & 0.9465 for PDF. The statistical results showed that the proposed Reliability Isograph Workbench and ANN model successfully predicts PDF for the shovel-dumper system. © 2020, Springer Nature Switzerland AG.