Prediction of interior noise driveline boom based on simulation and dB(VINS) transfer path

摘要

Rear wheel drive vehicles can contribute a significant noise share through the path of the rear axle. Torsional vibrations are transmitted through the driveline and causing reaction forces at the rear axle housing mounts, which result in driveline boom. With trends towards downsizing and higher specific power of combustion engines, controlling driveline boom phenomena becomes more challenging. While driveline torsional vibration can be simulated with CAE tools like multi body simulation (MBS), the transfer paths are typically not known before conducting measurements at existing prototype vehicles. Standardized transfer functions can be used instead of the vehicle specific transfer path functions, allowing the general evaluation of the noise sources. This method is described as dB(VINS) and is already applied for the noise path of engine mount vibration and radiation. This publication extends the existing dB(VINS) method for the noise share of a rear wheel drive (RWD) vehicle driveline. The generic transfer path functions for dB(VINS) are developed for the driveline noise share of RWD vehicles. A multi body simulation model of a RWD vehicle driveline is generated and correlated with measurement results. The rear axle excitations from a multi body simulation model are combined with the dB(VINS) transfer paths functions. This allows to determine driveline boom related interior noise based on multi body simulation of the driveline. This method enables to minimize driveline boom without the need for extensive hardware testing.