Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2001.11b
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- Pages.876-876
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- 2001
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- 1598-2548(pISSN)
Finite Element Analysis for Sound Propagation Characteristics in a Duct Lined with Poroelastic Foams
유한요소해석을 통한 탄성폼이 대어진 덕트내의 소음전파 특성 해석
- Lee, Seung-Yup (Dept.of Mechanical Aerospace Engineering, Graduate School of Seoul National University) ;
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Kang, Yeon-June
(Dept.of Mechanical Aerospace Engineering, Seoul National University)
- Published : 2001.11.01
Abstract
Axisymmetric finite element model is developed to determine sound propagation characteristics in a circular duct lined with a poroelastic foam. The foam and air models are derived based on the Biot's theory and the Helmholtz equation respectively and finally result in a quadratic eigenvalue problem in the wave number. Some cross sectional mode shapes are shown and sound attenuations and phase speeds of some acoustic modes are given. Those of fundamental modes are compared with those by forced response solutions and those from measurement results. The influence of lining thickness is also described on sound propagation characteristics.
Keywords