Prediction of forces induced by an active component on a chassis: Application to a powered seat

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Prediction of forces induced by an active component on a chassis: Application to a powered seat

Moulet, Marie-Helene / Danilov, Oleg / Martin, Vincent

In a vehicle, active components can provoke vibrations of the chassis resulting in a radiated acoustic field. Having in view to master it, forces entering the chassis must be limited. Because component suppliers have to characterize their product without the car, a predictive approach is used to obtain forces at the interface component/chassis. A previous study showed a method to predict the force vector entering the chassis from a measured force vector induced by the same source on a test bench using mobility characteristics of source and receivers. In the present study, this method is applied and validated in the case of a seat with power tracks. Some specific characteristic of this source lie in its spectrum and its mobility depending on the position of the seat on tracks. Two different measurement techniques of forces are compared. Beyond some general metrological and post-processing conclusions, more dedicated ones concerning the seat itself will be given. For instance, in the low frequency range, the mobility of the seat is greater than that of the chassis and the prediction is useless. On the contrary, in the medium frequency range, the prediction has to be carried out. At this stage the prediction of forces is the input to obtain the predicted acoustic pressure which will be compared to that measured.