0
Research Papers

Characteristics of Modal Sound Radiation of Finite Cylindrical Shells

[+] Author and Article Information
Tian Ran Lin1

School of Engineering Systems, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4001, Australiatrlin@qut.edu.au

Chris Mechefske

Department of Mechanical and Materials Engineering, Queens University, Kingston, ON, K7L 3N6, Canada

Peter O’Shea

School of Engineering Systems, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4001, Australia

1

Corresponding author.

J. Vib. Acoust 133(5), 051011 (Sep 20, 2011) (6 pages) doi:10.1115/1.4003944 History: Received August 18, 2010; Revised February 09, 2011; Published August 31, 2011; Online September 20, 2011

Characteristics of modal sound radiation of finite cylindrical shells are studied using finite element and boundary element methods in this paper. In the low frequency range, modal radiation efficiencies of finite cylindrical shells are found to asymptotically approach those of the corresponding infinite cylindrical shell when structural trace wavelengths of the cylindrical shells are greater than the acoustic wavelength. Modal radiation efficiencies for each group of modes having the same circumferential modal index decrease as the axial modal index increases. They converge to each other when the axial trace wavelength is much greater than the circumferential trace wavelength. The mechanism leading to lower radiation efficiency of modes with higher circumferential modal index of short cylinders is explained. Similar to those of flat plate panels, change in slope or waviness is observed in modal radiation efficiency curves of modes with higher order axial modal index at medium frequencies. This is attributed to the interference of sound radiated by neighboring vibrating cells when the distance between nodal lines of a vibrating mode is in the same order or smaller than the acoustic wavelength. The effects of the internal sound field on modal radiation efficiencies of a finite open-end cylinder are discussed.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Coordinate systems of the finite cylindrical shell

Grahic Jump Location
Figure 2

The FEM model and three of the axial uniform velocity distributing mode of the 0.59m long cylindrical shell

Grahic Jump Location
Figure 3

The modal radiation efficiency of the (0, 1) modes of the three free-free finite cylindrical shells and the corresponding infinite shell

Grahic Jump Location
Figure 4

The modal radiation efficiency of the (0, 2) modes of the three free-free finite cylindrical shells and the corresponding infinite shell

Grahic Jump Location
Figure 5

The modal radiation efficiency of the (0, 3) modes of the three free-free finite cylindrical shells and the corresponding infinite shell

Grahic Jump Location
Figure 6

Modal radiation efficiencies of a group of axially uniform modes (m=0) of the 0.59 m long cylinder

Grahic Jump Location
Figure 7

Modal radiation efficiencies of a group of m=1 modes of the 0.59 m long cylinder

Grahic Jump Location
Figure 8

Modal radiation efficiencies of a group of n=1 modes of the 0.59 m long cylinder with different axial wavenumber

Grahic Jump Location
Figure 9

Modal radiation efficiencies of a group of n=3 modes of the 5 m long cylinder with different axial wavenumber

Grahic Jump Location
Figure 10

Evolution of radiation directivity of mode (0, 2) of the 0.59m long cylinder. (a) Modal amplitude distribution. (b) Sound pressure distribution at 25 Hz, (c) at 500 Hz, and (d) at 1000 Hz.

Grahic Jump Location
Figure 11

Modal radiation efficiencies of the (0, 2) and (1, 2) modes of the open-end 0.59 m long cylinder and the corresponding baffled cylinder

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In