Akademik Veri Yönetim Sistemi
3rd International Congress of Engineering and Natural Sciences Studies, Ankara, Türkiye, 24 - 25 Mayıs 2023, ss.111
In this study, an analysis was carried out on a circular acoustic duct with sequential expansion and contraction chambers. This design is an example of low pass acoustic filters and can be used in many applications to reduce noise, filter out or isolate background sounds. Such applications play important roles in ventilations, jet engines, etc. In the last decades, many different approaches have been used to analyse such filters. For this particular and novel design, Mode Matching Technique was preferred in order to determine the reflection and transmission coefficients. Mode Matching Technique is a rigorous analytical method relying on the continuity relations of the field components at the interfaces of the relevant waveguide regions. These continuity relations can then be formulated to yield some systems of linear algebraic equations which can be solved applying certain numerical procedures. The accuracy of this analysis has been verified by comparing the results numerically with the results obtained from the simulations. Graphical results of these coefficients presented the acoustic low pass filter characteristics of this design where the cutoff for higher frequencies can be optimized with the help of the geometrical parameters. Besides, it is observed that Mode Matching analysis of this filter provides a significant time advantage compared to the simulation software.