Sound Radiation From Infinite Beams Under the Action of Harmonic Moving Line Forces

조화분포이동하중을 받는 무한보에서의 음향방사

  • 김병삼 (전북대학교 대학원 정밀기계공학과) ;
  • 이태근 (전북대학교 대학원, 정밀기계공학과) ;
  • 홍동표 (전북대학교공과대학정밀기계과)
  • Published : 1993.09.01


The problem of sound radiation from infinite elastic beams under the action on harmonic moving line forces is studies. 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 elastic foundation are 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 examined as a function of Mach number (M), 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.



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