Análise modal numérica de um conjunto porta e retrovisor de um automóvel

Abstract

Modal analysis is a process by which a structure is described by its natural characteristics (natural frequencies, damping factors and mode shapes). The door and the rear-view mirror of a vehicle, when subjected to the forced vibration generated by the motorization of the vehicle, can be resonant, compromising the functioning of the mirror. With the numerical modal analysis of a theoretical model of a door and rear-view set, it is possible to perceive its vibratory behavior (mode shapes and resonance frequencies) and to analyze if the forced vibration generated by the motorization will compromise the functioning of the rear-view mirror. For the theoretical door and rear-view set analyzed in this work, ten vibratory modes have resonant frequency coincident with forced vibrations generated by the motorization. All the mode shapes showed significant displacements in the rear view mirror, which indicates the impairment of the operation. As a solution to these vibration modes, the rigidity of the assembly was increased, resulting in a decrease for five vibrational modes with resonant frequency coincident with forced vibrations generated by the motorization. With a further study and development in the rigidity of the set, it is possible to avoid resonance schemes of the set.