On the observability of the pseudo-Rayleigh waves on submerged cylindrical shells. (February 2017)

• Record Type: Journal Article
• Authors: Iakovlev, S.; Lefieux, A.; Huntemann, B.; Santos, H.A.F.A.; Pyke, D.
• Is Part Of: Journal of fluids and structures. Volume 69(2017:Feb.)
• Page Start: 108
• Page End: 120
• Publication Date: 2017-02
• Subjects: Fluid-structure interaction -- Periodicals; Fluid mechanics -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.106
• DOI: 10.1016/j.jfluidstructs.2016.11.010
• Languages: English
• ISSNs: 0889-9746

Abstract

Abstract: The field radiated by a transiently responding submerged cylindrical shell is addressed, with the focus on the pseudo-Rayleigh wave A 0 . The main objective of the study is to offer further insights into the experimentally observed issues with the observability of the A 0 wave on certain types of thin shells. The presented analysis employs a semi-analytical methodology based on combining the use of classical methods of mathematical physics with a finite-difference approximation for the resulting structural modes. Two shell materials are considered, steel and duraluminum. The radiated hydrodynamic fields are explicitly imaged, and the A 0 wave is analyzed. It is demonstrated that for the steel shell, the A 0 wave is much more pronounced and has a much lower attenuation than for the same duraluminum shell, a result that is in agreement with the experimental studies. The shell material density is identified as the most likely primary cause of the observed differences in the radiation of the A 0 wave.