Internal structure optimization for noise reduction in next-generation blower silencers

This study addresses the noise challenges associated with roots blowers, pivotal devices in water treatment technology, by developing an innovative duct silencer. To construct an efficient internal structure for noise reduction, a novel rectangular design altering sound propagation direction was implemented. Additionally, an array of Helmholtz resonators giving substantial transmission loss within specific frequency ranges, was used. Experimental validation and acoustic analysis were employed to evaluate the silencer's performance, ultimately confirming its noise reduction capabilities. The optimized silencer through a parametric study of the Helmholtz resonator structure exhibited an impressive transmission loss of 14.75 dB, signifying a remarkable 74 % enhancement over the existing circular silencer design. This remarkable performance substantiated its effectiveness in mitigating noise. To validate the optimized design, a physical prototype was manufactured and subjected to noise measurement experiments, revealing a significant noise reduction of 17.3 dB.