AI Article Synopsis
- An innovative acoustic device has been developed that allows sound to travel in one direction, which is beneficial for various applications.
- This device operates by utilizing a rotating blade in air to create frequency shifts in scattered sound waves, linked to how fast the blade spins.
- The researchers used advanced theory to analyze this process and combined it with effective acoustic filtering, achieving a significant 20 dB difference in sound power transmission, enhancing performance at audible frequencies.
Article Abstract
An acoustic asymmetric transmission device exhibiting unidirectional transmission property for acoustic waves is extremely desirable in many practical scenarios. Such a unique property may be realized in various configurations utilizing acoustic Zeeman effects in moving media as well as frequency-conversion in passive nonlinear acoustic systems and in active acoustic systems. Here we demonstrate a new acoustic frequency conversion process in a time-varying system, consisting of a rotating blade and the surrounding air. The scattered acoustic waves from this time-varying system experience frequency shifts, which are linearly dependent on the blade's rotating frequency. Such scattering mechanism can be well described theoretically by an acoustic linear time-varying perturbation theory. Combining such time-varying scattering effects with highly efficient acoustic filtering, we successfully develop a tunable acoustic unidirectional device with 20 dB power transmission contrast ratio between two counter propagation directions at audible frequencies.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4454088 | PMC |
| http://dx.doi.org/10.1038/srep10880 | DOI Listing |
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