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Effect of lubricant contamination on EHL rolling contact: response surface methodology

100%

Maatallah S. , Saric M. R. , Khochemane L.

Engineering Transactions

2016

tom Vol. 64, iss. 1

69--88

In this research the failure of EHL rolling contact in highly contaminated media is investigated. The conducted study uses an original experimental device to predict the effects of operating parameters, namely, surface hardness, contaminant concentration, rotational velocity, and the applied load on wear and roughness components. The planning of the experiments was based on Taguchi’s L9 orthogonal array. The statistical significance of the above mentioned parameters on the results was explored using the analysis of variance (ANOVA). The relationship between responses’ factors and the operating parameters is also established employing the multiple linear regression method. ANOVA results show clearly that the surface hardness (H) and contaminant concentration (C) are the most significant factors that influence wear and surface roughness of machine elements.

Impact of air pollution with dust in the Ouenza iron mine – NE Algeria

88%

Abederahmane N. , Khochemane L. , Gadri L. , Rais K. , Bennis O.

Mining Science

2018

tom Vol. 25

19--31

Dust generation and its dispersion has been the major concern in ambient air quality in mines. This paper focuses on generation and dispersion of particles during mining operations. Atmospheric pollution in mines areas of Ouenza has become a serious problem. The goal of this study is therefore to review the air pollutants of the approach by discussing studies applying mass conservation model methods. To support these theoretical calculations, field measurements will be performed to determine the air quality in the region concerned and to develop a program to prevent excessive air pollution that threatens human health and the environment. For the treatment of the results, we used regression analysis, assuming that the relationship between the pollutant concentration Ci and weight of various Pi sampling stations in the mine of Ouenza is a straight line following a linear tendency. Validation of the results from this study for urban air pollution would be highly beneficial.