Abstract
Because of the limited sound insulation provided by a single material, it is common to use multiple layers of materials to improve the effects of sound insulation, but multiple materials increase the size of the model. In some cases, there are limits to the size of the model, or, if subwavelength sizes are required, it is necessary to investigate wideband sound insulation of subwavelength size. We designed a coded topological spherical model on the subwavelength scale, with two materials arranged periodically according to the coding idea. The results showed that at the subwavelength scale, the sound insulation effect of the coded topological spherical model was very significant; the sound pressure after using sound insulation was near 0.3 Pa, but the incident sound pressure was 100 Pa. These results overcome the excessive thickness problem of traditional materials used in sound insulation, which has long puzzled researchers, and expands the application of new sound insulation materials in the energy collection field.
Highlights
The importance of sound insulation has become more and more evident in recent years, and numerous efforts have been made to research the best way to insulate against noise
It can be seen that the internal sound pressure fluctuates around 0 Pa, and the external sound pressure fluctuates considerably with the frequency, while the amplitude is large
We propose a spherical acoustic model with subwavelength dimensions that provides a new concept for sound insulation research
Summary
The importance of sound insulation has become more and more evident in recent years, and numerous efforts have been made to research the best way to insulate against noise. Special acoustic structures are used for sound insulation.. There have been numerous studies using new acoustic metamaterials to achieve sound insulation.. Liu et al. proposed the concept of local resonance phononic crystals, and designed an experiment to show that sound insulation is simple at low frequencies. There are studies of the sound insulation performance of the plate structure.. Oudich et al. designed an acoustic metamaterial board and verified its excellent applications in shock absorption and noise reduction. Xiao et al. designed the resonant structure of a periodic array of resonators on a thin plate, which separated the low-frequency sound waves effectively and greatly improved the sound insulation of the plate-like structure. This structure could be applied as screening in a host of different applications
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