The purpose of this study is to evaluate the electromagnetic emission of the overhead power line, because these power line generate electromagnetic interaction with other objects near to it. The novelty of this work shows a numerical simulation of the electromagnetic field of the 400 kV line in both permanent and transient states at different positions, based on the finite element method using numerical software. Through the results of this study, it was found that the electromagnetic field in the transient state is very important. The findings of this research can be used to evaluate the field created around transmission lines in order to determine their impact on the environment and human health.

As a part of conditional maintenance, rotating machines are monitored and diagnosed in real time to increase their service life and ensure their availability in the industry. Our work aims to follow the evolution of the vibration for rotating machines through the integration of inverse problems such as degradation of the lubricant quality. Experimental tests were made in order to characterize the influence of quality lubricant (viscosity) on the vibration of a component of a rotating machine. Realized experimental bench is composed of gear device lubricated with lubricants of different viscosity grades and rotated at a variable rotational speed. In each case we measure the value of vibration. Following this experience, a vibration model has been developed depending on the change of state of lubricants, based on the results of planned experience. Further, a correlation analysis on the model obtained was realized and the results show an agreement between theory and experiment.