Acoustic radiation from random waves on plates

Mohammed, Neekar M.; Creagh, Stephen C.; Tanner, Gregor

Abstract

Controlling and simulating the sound radiating from complex structures is of importance in many engineering applications. We calculate the radiated acoustic power from plates with diffuse bending vibrations. We characterise the diffuse field by a two-point correlation function (CF) of normal velocities. Given the relation between field-field CFs and ray-dynamical phase space densities, the approach taken here offers a basis for coupling structure borne ray-tracing techniques with acoustic radiation. At the same time, it caters for stochastic, noisy driving of such systems. The results for the radiation efficiency of a plate are presented in an asymptotic form analogous to the Weyl formula for the density of states. Leading contributions from the plate interior and its boundary are derived, with corner corrections also being given for particular boundary conditions and right-angled corners. A notable feature of this analysis is that the bulk contribution vanishes below a critical frequency, and the asymptotic estimate of radiated power then leads with a boundary contribution. This is shown to agree well with a more traditional calculation based on modal analysis in the special case of a rectangular plate.

Citation

Mohammed, N. M., Creagh, S. C., & Tanner, G. (2022). Acoustic radiation from random waves on plates. Journal of Physics A: Mathematical and Theoretical, 55(39), Article 394004. https://doi.org/10.1088/1751-8121/ac8c08

• Journal Article Type: Article
• Acceptance Date: Aug 23, 2022
• Online Publication Date: Sep 8, 2022
• Publication Date: Sep 8, 2022
• Deposit Date: Feb 6, 2023
• Publicly Available Date: Feb 6, 2023
• Journal: Journal of Physics A: Mathematical and Theoretical
• Print ISSN: 1751-8113
• Electronic ISSN: 1751-8121
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 55
• Issue: 39
• Article Number: 394004
• DOI: https://doi.org/10.1088/1751-8121/ac8c08
• Keywords: acoustic radiation, radiation efficiency, diffuse field excitation, random waves, correlation function
• Public URL: https://nottingham-repository.worktribe.com/output/10367748
• Publisher URL: https://iopscience.iop.org/article/10.1088/1751-8121/ac8c08