International research journal of engineering, IT & scientific research 2020-08-09T12:06:54+00:00 Editorial Office Open Journal Systems <p style="text-align: justify;"><strong>IRJEIS&nbsp;</strong>is published in English and it is open to authors around the world regardless of the nationality. It is currently published three times a year, i.e. in&nbsp;<em>January, March, May, July, September,&nbsp;</em>and<em>&nbsp;November.</em></p> Preventive maintenance of taper bearing using Arduino in the application of industry 4.0 2020-08-09T12:06:54+00:00 Subekti Subekti Hadi Pranoto Beni Rukasah Salmon Setyo Qomarudin Yusuf Suyadiyanto Suyadiyanto Ari Slamet Ariyadi Abdul Hamid <p style="text-align: justify;">The maintenance of industrial tools is very important to support production. Therefore, many companies apply preventive maintenance. A national industrialization agenda discussed that it is crucial especially in the manufacturing industry. The battery-powered IoT sensing device is capable of thorough monitoring of industrial machinery enabling the development of sophisticated predictive maintenance applications under set scenarios. In this paper, we applied the concept of the Internet of Thing (IoT) system using LabVIEW via Arduino. The research method used in this study was similar to Susanto et al. (2019) namely Frequency Response Function (FRF) test to investigate the dynamic characteristics of a mechanic structure to identifying damages on X, Y, and Z axes of tapered bearing using harmonic vibration from handphones. Results of FRF and Labview via Ardunio were then compared to identify the results of measurement using LabView via Arduino. It was found much noise in the measurement occupying Labview Via Ardunio because its system does not use a filter like the one in FFT Analyser. However, in general, LabVIEW via Ardunia can predict damages in taper bearing. It is because, under broken condition, there was a two-time movement of natural frequencies from good condition.</p> 2020-07-08T00:00:00+00:00 ##submission.copyrightStatement## Mathematical modeling and numerical simulation of porous media single-phase fluid flow problem: a scientific review 2020-08-09T12:06:53+00:00 Yahya Jirjees Tawfeeq <p style="text-align: justify;">The complexity of porous media makes the classical methods used to study hydrocarbon reservoirs inaccurate and insufficient to predict the performance and behavior of the reservoir. Recently, fluid flow simulation and modeling used to decrease the risks in the decision of the evaluation of the reservoir and achieve the best possible economic feasibility. This study deals with a brief review of the fundamental equations required to simulate fluid flow through porous media. In this study, we review the derivative of partial differential equations governing the fluid flow through pores media. The physical interpretation of partial differential equations (especially the pressures diffusive nature) and discretization with finite differences are studied.&nbsp; We restricted theoretic research to slightly compressible fluids, single-phase flow through porous media, and these are sufficient to show various typical aspects of subsurface flow numerical simulation. Moreover, only spatial and time discretization with finite differences will be considered. In this study, a mathematical model is formulated to express single-phase fluid flow in a one-dimensional porous medium. The formulated mathematical model is a partial differential equation of pressure change concerning distance and time.&nbsp; Then this mathematical model converted into a numerical model using the finite differences method.</p> 2020-07-09T11:38:50+00:00 ##submission.copyrightStatement##