4 papers
Acoustic metamaterial exhibiting four different sign combinations of density and modulus
Yong Mun Seo, Jong Jin Park, Seung Hwan Lee +3
We fabricated a double negative acoustic metamaterial which consisted of Helmholtz resonators and membranes. Experimental data on the transmission and dispersion relation are prese…
Reverse Doppler Effect of Sound
Sam Hyeon Lee, Choon Mahn Park, Yong Mun Seo +2
We report observation of reverse Doppler effect in a double negative acoustic metamaterial. The metamaterial exhibited negative phase velocity and positive group velocity. The disp…
Negative Effective Density in An Acoustic Metamaterial
Sam Hyeon Lee, Choon Mahn Park, Yong Mun Seo +2
We report theoretical and experimental results for a new type of homogenized acoustic metamaterials with negative effective mass density. We constructed one-dimensional metamateria…
Acoustic Metameterial with Negative Modulus
Sam Hyeon Lee, Choon Mahn Park, Yong Mun Seo +2
We present experimental and theoretical results on an acoustic metamaterial that exhibits negative effective modulus in a frequency range from 0 to 450 Hz. One-dimensional acoustic…