Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지

A Study on Sound Radiation from Isofropic Plates Stiffened by Symmetrical Reinforced Beams

대칭형 보에 의해 보강된 등방성 평판의 음향방사에 관한 연구

  • Published : 1998.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The detemination of sound pressure radiated from peoriodic plate structures is fundamental in the estimation of noise levels in aircraft fuselages and ship hull structures. As a robust approach to this problem, here a very general and comprehensive analytical model for predicting the sound radiated by a vibrating plate stiffened by periodically spaced orthogonal symmetric beams subjected to a sinusoidally time varying point load is developed. The plate is assumed to be infinite in extent, and the beams are considered to exert both line force and moment reactions on it. Structural damping is included in both plate and beam materials. A space harmonic series representation of the spatial variables is used in conjunction with the Fourier transform to find the sound pressure in terms of harmonic coefficients. From this theoretical model. the sound pressure levels on axis in a semi-infinite fluid (water) bounded by the plate with the variation in the locations of an external time harmonic point force on the plate can be calculated efficiently using three numerical tools such as the Gauss-Jordan method, the LU decomposition method and the IMSL numerical package.

Keywords

References

  1. J. Sound & Vib. v.11 no.2 Free Wave Propagation in Periodically Supported by Infinite Beams Mead, D. J.
  2. J. Sound & Vib. v.61 no.3 An Approximate Theory for the Sound Radiated from a Periodic Line-Supported Plate Mead, D. T.;Mallik, A. K.
  3. J. of Acoustics Soc. Am. v.57 no.2 Vibration and Wave Propagation in Ribbed Plates Rumerman, M. L.
  4. J. G. Engineering Research Associate. Baltimore, MD, Report No.0-75-1 Sound Radiation from and Orthotropic Plate Supported by a Double Set of Stiffeners Greenspon, J. E.
  5. J. Sound & Vib. v.71 no.3 Sound Radiation from a Plate Reinforced by Two Sets of Parallel Stiffeners Mace, B. R.
  6. J. Sound & Vib. v.73 no.4 Periodically Stiffened Fluid-Loaded Plates(I) Mace, B. R.
  7. J. Sound & Vib. v.79 no.3 Sound Radation form Fluid-Loaded Orthogonally Stiffened Plates Mace, B. R.
  8. J. Sound & Vib. v.120 no.3 The Radiation Efficiency of Mass-Loaded, slender, Baffled Beams Seybert, A. F.;Tsui, Y. K.
  9. Trans ASME v.119 Acoustic Radiation from Multi-Span Baffled Panels Hawwa, M. A.;Nayfeh, A. H.
  10. J. Sound & Vib. v.136 no.1 Active Control of Sound Transmission/Radiation from Elastic Plates by Vibration Inputs I Fuller, C. R.
  11. J. Sound & Vib. v.153 no.3 Active Control of Sound Transmission/Radiation from Elastic Plates by Vibration Inputs II Metcalf, V. L.;Fuller, C. R.;Silcox, R. J.;Brown, D. E.