Author:

Keywords:

0203 Classical Physics, 0913 Mechanical Engineering, 1201 Architecture, Acoustics

Abstract:

Road noise modelling for NVH is gaining a strategic role in the design of modern vehicles. In this paper a hybrid modelling approach based on Frf Based Substructuring is followed to predict the noise and the vibrations on a car due to tire contact excitations in the mid-low frequency range [0÷500 Hz]. Different techniques are used to obtain the accurate models required in the frequency range of interest: experimental transfer path analysis for the car body, including vibro-acoustic frequency response functions (frfs); finite element modelling with test validation for the suspension; experimental modal analysis for the non-rolling and preloaded tires. Frfs have been synthesised from the tires modal models coupled to the suspension substructures in the finite element environment. These latter frfs have been subjected to the final coupling with the experimental vibro-acoustic frfs measured on the car body: the model has been built with the frf based substructuring technique, using bushings and mounts data for the connections between car frame and suspensions. A validation test of the model has been carried out on the full assembly exploiting the reciprocity principle. A comparison between the test and the hybrid model is commented to prove the results achieved with this approach.