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SCT907,, ext. 7095


Test of loss in 3D-printed acoustic cavities (6 units)

Additive fabrication, i.e., 3D printing, has been widely used in acoustic metamaterial experiments. However, 3D-printed structures have fine mesh and/or grid structures whose parameters (such as filling ratios) are tunable before fabrication. These fine structures can induce significant amount of dissipation of sound, which may impact device performances. In the project, we will design and fabricate acoustic cavities using different methods of 3D printing and test their acoustic performance. The outcome can be a guideline for future research and acoustic applications.

Design of low frequency vibration shield for electric automobiles (3/6 units)

Although electric automobile is generally quieter than those relying on gasoline, the vibration of electrical motor causes several very specific pitches that negatively affect the comfort in such vehicles. Mechanical metamaterials can display bandgaps for elastic vibrations, which may be useful for vibration isolation in electric automobiles. In this project, we will study the principle of elastic vibration and explore the tunability of mechanical metamaterials and seek to design a potentially useful unit. The student is expected to have good command with Newtonian mechanics and familiar with the concept of resonance.