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Engineering Analysis with Boundary Elements

Publication date: 2013-02
Volume: 37 Pages: 250 - 259
ISSN: 0955-7997, 1873-197X
DOI: 10.1016/j.enganabound.2012.09.013
Publisher: Computational Mechanics Publications

Author:

Yuan, Chongxin
Roozen, Bert ; Bergsma, Otto ; Beukers, Adriaan

Keywords:

Science & Technology, Technology, Physical Sciences, Engineering, Multidisciplinary, Mathematics, Interdisciplinary Applications, Engineering, Mathematics, Composite, Noise reduction, FEM/BEM, Genetic algorithm, NOISE, Applied Mathematics, 0102 Applied Mathematics, 0905 Civil Engineering, 0913 Mechanical Engineering

Abstract:

The aircraft fuselage is idealized as a composite cylinder, its vibro-acoustic properties are studied both experimentally and numerically (FEM/BEM), and a minimization of the inner pressure of a composite cylinder is conducted with the genetic algorithm (GA). In the optimization, the concept of the Acoustic Transfer Vector (ATV) builds the relationship between the structural surface velocity and the sound pressure. Results show that the noise reduction obtained by the experimental and numerical methods have a good agreement; the optimization method which combines GA and ATV show high efficiency and robustness; increase of the bending stiffness of the cylinder can improve the noise reduction at low frequencies; both the reduction of weight and the increase of noise insulation can be achieved by optimization of the layup at different regions of the cylinder respectively.