Abstract
In this paper, we provide an overview of recent advancements in novel sound absorption designs, predominantly based on optimized coupling between resonances. First, we present a sound absorption panel design capable of achieving high absorption in the low-frequency broadband range (50–63 Hz, one-third octave band). This panel demonstrates an average absorption coefficient of approximately 93%, all while maintaining a thickness of 15.4 cm (equivalent to 1/45 of the wavelength at 50 Hz). Transitioning from the one- port system, we delve into the realm of the two-port system, introducing an ultra-sparse structure for flow-free sound absorption. This structure exhibits near-perfect absorption (∼99%), and this absorption capability is achieved when the spatial period of monopole–dipole resonators is close to one working wavelength (95% wavelength). These developments signify significant strides in sound absorption technology, presenting innovative solutions with enhanced efficiency and performance across various frequency ranges and environments.
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