Conference_programme: 19.1 - Duct Acoustics
Lecture: Review of splitter silencer modeling techniques
Author(s): W Nashed Mina, Elnady Tamer, Åbom Mats
Summary:
Dissipative silencers are commonly used in different applications. There are several configurations for dissipative silencers, but one of the most effective configurations is the Splitter (Baffle) Silencer. It has been used for many years for different applications such as HVAC, gas turbines, large diesel engines … etc. However, these silencers need to be carefully designed to tune its effective frequency band of operation to the source excitation frequency. It must be also optimized with the amount of pressure drop they introduce to the system, and the amount of flow generated noise resulting from splitting the flow. Splitter Silencers are effective for high frequency sound attenuation and their modeling involves handling a lot of traveling modes. For years, there has been a lot of efforts made by several researches to develop models for splitter silencers, but usually these models can predict the acoustic behavior in the low and mid frequency ranges only. The characterization of the acoustic performance of these silencers is a challenge on its own, to measure the Insertion Loss for all frequencies. In this paper, reviews of models available in the literature are discussed, and a model recently developed for bar silencers is presented. This model is adapted to the splitter silencer and can use three different methods to calculate the acoustic performance; the least attenuated mode, global attenuation estimation, and mode matching. Also, Beranek model is implemented and used in this study. The results are compared to the literature, FEM simulation using COMSOL, and measurements listed in baffle silencer datasheet.
Corresponding author
Name: Mr Mina W Nashed
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Egypt
