Noise Reduction in Ducts using Helmholtz Resonators
Ducts are common components of contemporary construction. They have been extensively employed in building ventilation systems. The movement of the air produces an imperceptible harmful noise. People working in workplaces are often subjected to this noise. Large exposure of noise leads to long term effect on the human health. We have designed system based on the helmholtz resonators for controlling these types of noise. Helmholtz resonator can absorb the sound of the desired frequency by properly designing its geometry. We have used different Helmholtz resonators in the combination of the serial and parallel arrangements. The system is analysed numerically in COMSOL and validated by a theoretical model. The theoretical and numerical results both are in good agreement . The proposed model provides a significant amount of transmission loss. There is broadband low frequency attenuation due to combine effect of the Bragg reflection and Helmholtz resonance. These types of the model are very useful where the space is not a constrain.
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