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Author: search.filters.author.Adhikari, G.R.Has files: No

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    Development of noise spectrum based maintenance guideline for reduction of heavy earth moving machinery noise
    (2006) Vardhan, H.; Adhikari, G.R.
    Heavy earth moving machinery (HEMM) is one of the most important sources of noise in open-pit mines. Several studies carried out earlier indicate that noise produced by HEMM can be reduced by proper maintenance. To reduce the overall noise produced by HEMM it is important to identify the components contributing most to the noise. Maintenance of those components can then be carried out rigorously to reduce the noise. This paper presents the development of a maintenance guideline for reduction of HEMM noise based on sound level emissions and noise spectrum studies. The sound level emission and noise spectrum based maintenance guidelines were obtained through noise measurement of HEMM like dumpers, dozers and front-end-loaders over a period of time and under various test conditions. These guidelines can help the maintenance crew for the reduction of noise from HEMM. © 2006 Institute of Noise Control Engineering.
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    Estimating rock properties using sound levels produced during drilling
    (Elsevier BV, 2009) Vardhan, H.; Adhikari, G.R.; Govinda Raj, M.
    An attempt has been made in this paper to experimentally investigate the estimation of rock properties like compressive strength and abrasivity using sound levels produced during drilling. The investigation was carried out on a laboratory scale using small portable pneumatic drilling equipment used in hard rock drilling. For this purpose, a pneumatic drill setup was fabricated for drilling vertical holes. The compressive strength and the abrasivity of various rock samples collected from the field were determined in the laboratory. A set of test conditions were defined for measurement of sound level of the pneumatic drill. Also, with the help of the experimental setup, vertical drilling was carried out on the rock samples for varying thrust and air pressure values and the corresponding A-weighted equivalent continuous sound levels were measured. Results of this study indicate that sound level can be a promising tool in estimating rock properties during drilling. © 2008 Elsevier Ltd. All rights reserved.