Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The pressure amplitude distributions at the bottom of each channel with changing frequencies of incident sound for (a) the space-coiling structure and (b) the effective structure. The incident pressure amplitude is 1 Pa. (c) The resonance frequency of each channel obtained by the simulation of the space-coiling structure (black square), the simulation of the effective structure (red circle), and the theoretical quarter-wavelength model (green triangle).
