Waves in Fluids, Solids and Metamaterials
Wonju Jeon Korea Advanced Institute of Science and Technology (KAIST)
Waves are everywhere and we meet waves every day. We hear the sound, feel the vibration, and see an object. Sometimes, we want to escape from the noise, want to be comfortable in the absence of vibration, and want to observe an object beyond the limit of resolution. In this talk, we’ll meet acoustic and elastic waves in stationary or moving media and metamaterials.
In the first part, we study how to make an object acoustically invisible in the presence of non-uniform mean flow. Since the existing acoustic cloaks lose their unique properties even at low subsonic Mach number, we propose a theoretical framework to investigate the effect of compressible non-uniform flow on the scattering pattern of acoustic cloak for the purpose of understanding the physics of acoustic cloak within flow and designing a new concept of metamaterial in moving medium.
In the second part, we introduce an efficient way of damping vibration in a compact space by proposing a simple mathematical shape of wedge-type geometry attached to a vibrating structure such as plate or beam.
Lastly, the presenter emphasizes the role of applied mathematics in engineering sciences by solving an interesting quiz and its application to wave phenomena.
Date(s) - 01/19/2017
4:00 pm - 5:00 pm
1062 Bainer Classroom