Experimental investigation of damping flexural vibrations in plates containing tapered indentations of power-law profile

Acoustic black holes: recent developments in the theory and applications

“…holes [29,30] 22 Figure 10 shows the measured frequency response for a rectangular plate shown in Fig. 9 and containing six power-law profiled circular indentations with central holes and with added pieces of damping layers, in comparison with the response of a reference plate of the same size [29]. As it can be seen, the damping at resonant peaks caused by acoustic black holes is quite substantial, up to 15 dB at higher frequencies.…”

“…9) and investigated experimentally [29,30]. holes [29,30] 22 Figure 10 shows the measured frequency response for a rectangular plate shown in Fig.…”

“…9) and investigated experimentally [29,30]. holes [29,30] 22 Figure 10 shows the measured frequency response for a rectangular plate shown in Fig. 9 and containing six power-law profiled circular indentations with central holes and with added pieces of damping layers, in comparison with the response of a reference plate of the same size [29].…”

“…As it can be seen, the damping at resonant peaks caused by acoustic black holes is quite substantial, up to 15 dB at higher frequencies. [29] In paper [30], the sound power radiated by a rectangular plate with six indentations shown in Fig. 9 has been measured and compared with the radiation of a reference plate of constant thickness having the same geometrical dimensions.…”

“…Other important structures that have been investigated at Loughborough were rectangular plates with tapered indentations (pits) of power-law profile drilled inside the plates [27][28][29][30]. In black holes for flexural waves.…”