Comparison of Eigen frequency and Sound Pressure Level between Straight and Bent Ducts

Katsuhiko Kashihara, Kunihiko Ishihara

Resonant frequency, Acoustic mode, Straight duct, Bent duct

Ducts are widely used in various industrial fields. Ducts, which are used in many places, can be connected to sources of noise. In locations where quietness is required, ducts need to be designed to suppress noises. To reduce noises, it is necessary to suppress resonance. To avoid resonance, it is essential to know the natural acoustic frequencies of the duct. In this paper, we will clarify the changes in frequency caused by multiple bends in the duct. Furthermore, we will study and clarify the changes in the sound pressure level when sound-absorbing material is inserted into a bent duct.

https://dx.doi.org/10.31873/IJEAS.11.04.04