Hybrid Finite Element - Wave Based techniques for interior vibro-acoustics. Application to a large-sized vehicle model

摘要

Nowadays, in automotive industry, a large part of the design process takes place in a virtual environment in order to shorten the time-to-market while keeping high-quality standards. Numerous methodologies based on numerical techniques have been developed in the past decades, aimed at assessing functional performance attributes. In this paper, the focus is on three-dimensional acoustic analysis for interior truck cabin applications in the low and low-medium frequency range, which is increasingly analyzed by means of deterministic methods. Among those there is the Finite Element Method (FEM), of which the range is practically limited to the low-frequency range because of its intrinsic features such as interpolation and pollution. Recently, a new class of deterministic techniques has been developed, under the name of Wave Based Methods (WBMs), which are based on the indirect Trefftz approach. Hybrid formulations have been developed in order to combine their main features with a wide range of other numerical techniques. In this paper such a hybrid FE-WBM is applied to an interior truck application in order to illustrate its potential towards industry-relevant applications in the low- and mid-frequency range.