NVH Approach on Front End Division Using HyperWorks Applications

Issmail Meskin, Valeo

The front End Module division designs, produces and delivers on just-in-time Front End modules to car manufacturers in Europe, Asia and America. The module integrates the thermal management, crash & pedestrian management and motor fan system functions. Besides all these functions that will significantly impacts the Front End mass, the customer still wants more mass reduction for less consumption and less CO2 emission. All these functions impacts FEM vibration performances.

Indeed, the vibration phenomena that impact the FEM are numerous. Generated during travelling or transmitted by different components, they must not undermine or reduce the comfort of the passenger in the cabin.

To cope this problematic, the division uses different methodologies to validate the behaviour of the structure: modal analysis, frequency response but also PSD analysis. But it is mainly through a combination of optimization tools or dynamic reduction and these analyses that we bring a high added value.

We will see an example of front end module validation approach submitted to PSD load. A dynamic condensation is used to validate the structural performance and limit the assumptions.

This provides behaviour similar to tests. It also allows a significant reduction of computing time.

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