Example: a mathematical model for the vibration isolation of automobile equipment

The specifications from car manufacturers require that automotive suppliers validate the components with their on-board assembly. In the case of engine cooling modules, the validation testing must integrate the elastomeric mounts while performing the vibration testing. But these elastomeric materials induce non-linear dynamics that may lead to the amplification of the vibratory solicitations and must be taken into account in simulation models in order to obtain reliable calculation and to perform fatigue analysis.
Thanks to its partnership with the Carnot institute I@L, through an industrial PhD (CIFRE thesis), Valeo has now a new simulation process in two steps. The first one is a non-linear temporal model for integrating the behavior of the elastomeric mounts. The second one is a classical Power Spectral Densities (PSD) calculation with a new excitation spectrum obtained as a result of the first calculation. Integrating this model into an industrial calculation process then makes it possible to predict how the suspension components will behave and thereafter calculate the structure’s complete model.