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. 2015 Nov 13;15(11):28742–28763. doi: 10.3390/s151128742

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Simulated results for cylindrical pipe (d = 10 mm, h = 3 mm, and w = 8 mm) with various lengths: (a) frequency response in decibel scale and (b) fundamental frequency distribution in absolute scale.