Gear noise analysis using CTPA on a full vehicle with a rear axled differential

In this paper, an in-situ Component Transfer Path Analysis (CTPA) is conducted on a full vehicle with a Rear Axle Differential. The in-situ computation is performed with both the directly measured Frequency Response Functions (FRF) and as well as a computation using the Virtual Point Transformation (VPT). These two computations produce different blocked forces. To assess their accuracy, we exploit the principle that blocked forces should be independent of the vehicle's dynamic properties. Hence, to validate the blocked forces obtained, we modified the vehicle’s subframe by adding extra masses and conducted a "transfer validation." Here we validate if the blocked forces from the original setup can predict the vibrations in the modified configuration well, testing the accuracy of both predictions.