On the acoustic transmitting behaviour of a waveguide sideloaded with cylindrical resonators.

Wendrich, Luuk (2024) On the acoustic transmitting behaviour of a waveguide sideloaded with cylindrical resonators. Bachelor's Thesis, Applied Physics.

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Abstract

In this thesis, the acoustic transmitting behaviour of a waveguide sideloaded with resonators is analysed using the transfer matrix method, the cost function and COMSOL. Comparisons are made between homogeneous systems, filled with water or air, and an inhomogeneous system that includes a volume of air in the resonator and water in the waveguide. Subsequently, the water-air ratio in the resonator and resonator separation distances are optimized to obtain maximum attenuation. This thesis has found that the inhomogeneous resonators serve as an effective low-frequency sound attenuator. Shifting the resonance frequencies to the lower frequency range (100-1000 Hz) and increasing its attenuating bandwidth, therefore achieving an average transmission of ≈ 0.08% in this frequency range. The optimum water-air ratio in the resonator was found to be 100% air and the optimum waveguide lengths between resonators (L2→10) for a 10 resonator system were found to be 0.02235 m, 0.1248 m, 0.1432 m, 0.1405 m, 0.1437 m, 0.1405 m, 0.1467 m, 0.1472 m and 0.0645 m respectively. The COMSOL model validated the analytical solution of the frequency responses but did show diminished correlation when the water-air ratio was altered from the evenly distributed configuration. To further investigate this, additional research is recommended.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Krushynska, A.O.
Degree programme:	Applied Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	29 Feb 2024 14:05
Last Modified:	29 Feb 2024 14:05
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/31999

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