Noise radiated from a periodically stiffened cylindrical shell excited by a turbulent boundary layer. (3rd February 2020)

• Record Type: Journal Article
• Authors: Maxit, Laurent; Guasch, Oriol; Meyer, Valentin; Karimi, Mahmoud
• Is Part Of: Journal of sound and vibration. Volume 466(2020)
• Publication Date: 2020-02-03
• Subjects: Stiffened cylindrical shell -- Turbulent boundary layer -- Fluid loading -- Noise prediction -- Bloch-Floquet wave; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2019.115016
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: This work proposes a semi-analytical method to model the vibroacoustic behavior of submerged cylindrical shells periodically stiffened by axisymmetric frames and excited by a homogeneous and fully developed turbulent boundary layer (TBL). The process requires the computation of the TBL wall-pressure cross spectral density function and the sensitivity functions for stiffened cylindrical shells. The former is deduced from an existent TBL model and the latter are derived from a wavenumber-point reciprocity principle and a spectral formulation of the problem. The stiffeners' dynamic behavior is introduced in the formulation through circumferential admittances that are computed by a standard finite element code using shell elements. Four degrees of freedom are taken into account for the coupling between the shell and the stiffeners: three translation directions and one tangential rotation. To investigate the effect of the stiffeners on the radiated noise, two case studies are considered. The first one examines a fluid-loaded cylindrical shell with regularly spaced simple supports. The influence of Bloch-Floquet waves and the support spacing on the noise radiation are highlighted. The second case study inspects the fluid-loaded cylindrical shell with two different periodic ring stiffeners, namely stiffeners with T-shaped and I-shaped cross-sections. Their influence on the vibroacoustics of the shell is thoroughly analyzed.