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http://dx.doi.org/10.5050/KSNVE.2017.27.2.234

Study on the Acoustic Modes of a Short, Thick, Asymmetric Cylinder  

Lee, Hyeongill (School of Automotive Engineering, Kyung-pook National University)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.27, no.2, 2017 , pp. 234-242 More about this Journal
Abstract
This study investigates vibro-acoustic characteristics of a short, thick cylinder containing a slot given a pined-free boundaries. Using the finite element analysis results, structural modes of the asymmetric cylinder (with a slot) are expressed as the linear combinations of modes of the symmetric cylinder made of same material with identical geometry except the slot. Based on synthesized modal vibrations, acoustic modes of the asymmetric cylinder are obtained with two approaches, i.e., Rayleigh integral calculation and modal expansion of the acoustic modes of the symmetric cylinder. Also, acoustic powers, max. sound pressure and directivity pattern are obtained from acoustic modes and verified with the boundary element analyses. Based on these results, the accuracy of proposed approaches in calculating the vibro-acoustic properties of a short, thick, asymmetric cylinder has been confirmed. The procedure can be applied to the similar cylinders with other boundaries or asymmetric properties. Also, attenuation of vibration and/or sound radiation of the cylinder type practical components can be studied using these approaches.
Keywords
Asymmetry; Thick Cylinder; Narrow Slot; Acoustic Mode; Modal Vibration;
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Times Cited By KSCI : 4  (Citation Analysis)
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