Ventilated silencing device and its modeling using a sub structuring approach

Noise is considered as the major source of annoyance in modern urban environment. Silencing devices with broadband sound attenuation characteristics and ventilation abilities are generally desired. For the acoustical analyses of such systems, difficulties still exist due to the complex vibroacoustic coupling involved among various structural components, which pose challenges to most of the existing modeling tools. In this paper, the modeling of a class of so-called Ventilated Silencing Devices is presented using a sub structuring Patch Transfer Function approach. Through numerical examples of a ventilation window and an acoustic silencer, it is shown that the proposed approach can handle complex vibroacoustic systems in a very flexible and systematic way. Meanwhile, its advantage in performing system optimization with a reduced computational cost is demonstrated. A comparison between the sub structuring and other available numerical approaches is given in the final conclusion.