Decorated granular crystal as filter of low-frequency ultrasonic signals
- 47 Downloads
We numerically study uncompressed granular crystals excited by sinusoidal signals at 1–100 kHz. A simple system such as two beads in a line reveals that for a fixed driven frequency, incident signals can be transmitted or filtered depending on the driving amplitude. We show that using square tapered crystals with decoration it becomes possible to enhance the low frequency filtration properties of granular systems. In addition to filtration, we find that \(80\%\) or more of the input force is attenuated using a crystal thickness of 4 grains.
KeywordsUltrasonic signals Filtration Transmission Granular filter Decorated crystal
The authors gratefully acknowledge financial support from the UFPA. L.M. also thanks the Department of Physics of UB for hospitality during his visit. S.S. was a recipient of a Fulbright-Nehru Academic and Professional Excellence Fellowship during the performance of this work.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 2.Dickson, E.D.D.: Some effects of intense sound and ultrasound on the ear. Proc. R. Soc. Med. 46, 139 (1952)Google Scholar