Parametric study of forces applied to a host structure by a vibratory component

摘要

In cars, the vibratory behaviour of components attached to the chassis (host structure) has to be predicted from the behaviours of the components and the host structure considered separately. Among others, forces entering the host system, induced by a component, are of great interest for vibratory and acoustic reasons. To this end, the component is first tested on a test bench and then the forces entering the host structure are deduced by matricial calculation from those entering the test bench. In a technological configuration, in which modelling is difficult, all the necessary matrices are measured. The aim here is to estimate how precise the different types of measurements (in particular the inertance of the isolated component) need to be in order for the prediction to satisfy a given degree of precision. The component under study is a fan system.