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Control of vibration and sound radiation from structures is very important in design of quieter mechanical systems. Recently a geometrical modification for design of structures by embedding “Acoustic Black Holes” is used to control vibration and hence sound radiation. An acoustic black hole is a power-law tapered profile to reduce phase and group velocities of wave propagation to zero. Also, the vibration energy at the location of an acoustic black hole increases due to the gradual reduction of thickness. The major applications of this passive structural modification are many namely damping of vibration, noise reduction and vibration energy harvesting. The damping of vibration is achieved by placing damping material at the locations of acoustic black holes where vibration energy are concentrated. The suppression of structural vibration reduces sound in the near field which then results in noise reduction. The recent developments in vibration energy harvesting is based on the use of piezoelectric material as transducer to produce electrical output. In the case of vibrating structures, piezoelectric material is used where the acoustic black holes are embedded. As the vibration energy at these locations is increased which then yields increased electrical energy output for harvesting. This presentation includes recent developments in theory and applications of acoustic black holes to structural vibration control, noise reduction and energy harvesting.
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