Auralization of radiated gearbox noise from a full-scale transaxle model using numerical vibro-acoustic transfer functions (vor Ort)
* Presenting author
Abstract:
Due to the increasingly stringent noise exposure regulations as well as rising customer expectations, there is a growing need to incorporate, assess and improve the vibro-acoustic behavior of products in early design stages. In transportation industry, the current ecological trends towards electrification and light-weighting of vehicles also bring forth novel and formerly masked noise problems. Going beyond typical frequency domain analysis and providing an audible prediction of the radiated noise, can add an extra dimension for the design engineer to assess the expected noise characteristics, without the need for full-scale prototypes. In the context of gearbox noise, the current paper proposes combining time-domain drivetrain simulations with a frequency-domain vibro-acoustic finite element model of a gearbox housing to determine audible sound pressure responses for the assessment of different bearing input forces and housing design changes. To this end, simulated time-domain bearing force signals are filtered using vibro-acoustic frequency response functions obtained from free-field sound pressure responses for a unit point force excitation of the gearbox housing at a bearing location. The proposed method models the full chain from noise source to output and thus enables translating design changes into audible impressions of the resulting noise characteristics.
