An Experimental and Numerical Study on the Effect of Spacing between Two Helmholtz Resonators

This study investigates the acoustic performance of a system two Helmholtz resonators experimentally and numerically. The distance between was varied to assess its effect on quantitatively. Experiments were performed using an impedance tube with instrumented several microphones along tube. relation noise attenuation is presented in terms transmission loss, coefficient, change sound pressure level underlying mechanisms spacing are further elaborated by studying particle velocity fields obtained through finite element analysis. results showed that there might exist optimum for achieving maximum loss. However, loss not accompanied broadest bandwidth attenuation. field spectra inside achieved when spaced half wavelength associated resonance frequency resonate in-phase. To achieve over broad bandwidth, resonator quarter required, which case operate out-of-phase.