Schemes for the sound transmission of flat, curved and axisymmetric structures excited by aerodynamic and acoustic sources. (15th September 2019)

• Record Type: Journal Article
• Authors: Errico, F.; Ichchou, M.; Franco, F.; De Rosa, S.; Bareille, O.; Droz, C.
• Is Part Of: Journal of sound and vibration. Volume 456(2019)
• Page Start: 221
• Page End: 238
• Publication Date: 2019-09-15
• Subjects: Sound transmission -- Turbulent boundary layer -- Periodic structures -- Curved structures -- Multi-layered structures; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2019.05.041
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: The paper describes a methodology for computing the sound transmission loss of any flat, curved and cylindrical, homogeneous and periodic structure, under any type of acoustic and/or aerodynamic load. An approximate excitation model is introduced to reproduce uncorrelated and spatially-correlated loads using a wavenumber integration of surface waves. Then, a wave finite element formulation is developed and interfaced with the excitation models in order to cover industrially-relevant case studies. Analytical, numerical and experimental transmission losses are presented for validation purposes. Finite size effects are also taken into account using a spatial windowing and a cylindrical analogy, for curved structures. Different periodic-cell designs are also compared and investigated under turbulent boundary layer and diffuse acoustic field excitations.