Prediction of structure-borne vibration for an assembly of three structures in series

Marie-Hélène Moulet , Vincent Martin (1)

1 DALEMBERT - Institut Jean Le Rond d'Alembert

The prediction of structure-borne sound and vibration in an assembly of two structures needs the prediction of the forces applied by the source structure on the host or receiver structure. Often, the source structure excites the receiver through an intermediary structure. Two ways are possible to describe three structures in series: by creating a new receiver as the assembly of the intermediary and receiver structures or by creating a new source as the assembly of intermediary and source structures. A recent study showed in an industrial case that the prediction of forces for three structures in series was better when based on inertance measurements of certain coupled structures rather than of isolated structures. In the present paper, the numerical coupling (by finite elements) of three beams in series is considered. No rotation degrees of freedom are taken into account. In the first part, three different methods used to calculate forces applied on the receiver beam are recalled. Then, in the second part, simulation results obtained with these three methods are compared and discussed. In particular, if the rotation degrees of freedom are responsible of the differences observed during the measurements, such differences would not occur in the numerical experiments.

Mots clés: structure-borne vibration; coupling of three structures; forces prediction

Domaines: Acoustique [physics.class-ph]

Marie-Hélène Moulet, Vincent Martin. Prediction of structure-borne vibration for an assembly of three structures in series. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810739⟩