Title: A study of noise transmission through cylindrical shell using modal truncation approach

Authors: Ali El Hafidi; Bruno Martin; Waleed F. Faris; Béatrice Lay

Addresses: LRMA-ISAT, 49 Rue Mademoiselle Bourgeois 58000, Nevers, France. ' ICB, UMR CNRS 5209, Université de Bourgogne, France. ' Department of Mechanical Engineering, College of Engineering, International Islamic University Malaysia (IIUM), Jalan Gombak, Gombak, 53100 Kuala Lumpur, Malaysia. ' LRMA-ISAT, 49 Rue Mademoiselle Bourgeois 58000, Nevers, France

Abstract: The study of the vibroacoustic behaviour of cylindrical structure like aircraft fuselage requires the establishment of very large models, and the numerical results which can be obtained are often difficult to interpret. On the other hand, the study of simple structures such as cylindrical shells is useful to validate the criteria and tools that can be used to simplify the models of complex structures. The presented study concerns the sound transmission through a cylindrical shell coupled to a cavity and subjected to an incident acoustic wave. Noise reduction is obtained and validated by a numerical method which uses structural and acoustical modes. A criterion for selecting eigen modes for the modal truncation is presented. Based on a principle of modal coupling, this criterion allows a judicious choice of modes that have an important influence on noise reduction. This criterion is used to reduce the length of acoustical and mechanical bases and to decrease time calculation.

Keywords: noise transmission; modal truncation; acoustics; cylindrical shells; aerospace; automotive; vibroacoustic behaviour; sound transmission; aircraft fuselage; noise reduction; airplane noise; aeroplane noise; vehicle noise.

DOI: 10.1504/IJVNV.2011.042424

International Journal of Vehicle Noise and Vibration, 2011 Vol.7 No.3, pp.271 - 284

Available online: 10 Sep 2011 *

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