# 조화집중하중을 받는 무한보에서의 음향방사

• 김병삼 (전북대학교 대학원, 정밀기계공학과) ;
• 홍동표 (전북대학교 대학원, 정밀기계공학과)
• Published : 1992.03.01

#### Abstract

The problem of sound radiation from infinite elastic beams under the action of harmonic point forces is studied. The reaction due to fluid loading on the vibratory response of the beam is taken into account. The beam is assumed to occupy the plane z = 0 and to be axially infinite. The beam material and the elastic foundation re assumed to be lossless and Bernoulli-Euler beam theory including a tension force (T), damping coefficient (C) and stiffness of foundation $(\kappa_s)$ will be employed. The non-dimensional sound power is derived through integration of the surface intensity distribution over the entire beam. The expression for sound power is integrated numerically and the results are examined as a function of wavenumber ratio$(\gamma)$ and stiffness factor$(\Psi)$. Here, our purpose is to explain the response of sound power over a number of non-dimensional parameters describing tension, stiffness, damping and foundation stiffness.

#### References

1. Sov. Phy. Acoust. v.27 no.3 Sound Radiation from a Plate under the Action of Moving Harmonic Forces M.I.Mogilevskii
2. J. Sound Vib. v.92 no.2 A Note on the Acoustic Radiation from Point-Force Elastic Beams R.F.Keltie
3. J. Acoust. Soc. Am. v.77 no.6 On the Acoustic Power Radiated by Line Force on Elastic Beams R.F.Keltie;H.Peng
4. J. App. Mech. v.55 Sound Radiation From Beams Under the Action of Moving Line Forces R.F.Keltie;H.Peng
5. proceedings NOISE-CON 88 Effects of Source Motion and Foundation Stiffness on the Acoustic Radiation from Submerged Structures R.F.Keltie;H.Peng
6. Noise and Vibration R.G.White;J.G.Walker
7. Wave Motion in elastic Solids K.F.Graff
8. Sound, Structure and Their Interactions M.C.Junger;D.Feit
9. Sound and Structural Vibration(Radiation, Transmission and Reponse) F.Fahy