Prediction of structure-borne noise caused by the powertrain on the basis of the hybrid transfer path

Abstract

In the early development stage, the prediction of interior noise due to powertrain vibration is important for enhancement of the noise vibration harshness (NVH) performance. Traditional transfer path analysis (TPA) technology has been used to estimate interior noise on the basis of experiment by using real parts of the powertrain. When a structural modification of the powertrain is necessary to reduce interior noise, it is efficient to use a finite element (FE) model of the powertrain components to identify the effect of that modification. In this paper, hybrid TPA is employed. Until now, no paper has been presented on predicting the interior noise caused by a powertrain on the basis of hybrid TPA with a real vehicle. The hybrid TPA uses a simulated excitation force as the input force, which excites the flexible body of a car at the mount point, whereas the traditional TPA uses the measured force. This simulated force is obtained by numerical analysis for the FE model of a powertrain. The interior noise is predicted by multiplying the simulated force by the vibroacoustic transfer function (VATF) of the vehicle. The trend of the predicted interior noise based on the hybrid TPA corresponds very well to the measured interior noise.