BEM Modeling of Non Linear Systems Noise

A noticeable part of acoustic environment is made of sounds radiated by vibrating structures. Most of these sounds are considered as undesirable noise. Especially, those radiated from complex processes involving several non linear effects. In the present work, the transient response of mechanical system is computed first by using LSDYNA, an explicit finite element code for general fluid, structure and fluid-structure interaction problems. By applying the FFT, it’s transformed into frequency response which allows to use BEM for computing the noise radiated at any point into space. Results are checked for simple acoustic and classical vibroacoustic problems before applying it for a non linear case. The numerical examples show the efficiency of the present method.