Analysis of electromagnetic resonances in the case of a vehicle using different sets of field points

In order to improve the electric/electronic architecture of a vehicle, resonances should be identified and solved upstream. In this paper, we present a study of the resonances occurring inside a vehicle using a numerical code based on the method of moments. Three different types of sets of field points have been used to carry out this study. The first set is composed of points localized in the entire volume of passenger compartment. Points at the location of several pieces of equipment constitute the second set. The third set is made up of points along the route of the harnesses. The methodology used for this investigation is based on the computation of the electromagnetic fields on the different sets of field points, followed by the identification of the resonant frequencies by post-processing the field values. An analysis of these results shows that it is possible to study resonance occurring inside the vehicle using only the two first sets of field points, allowing the identification upstream of immunity risks to external sources.