탄성을 갖는 박판상에서의 유동특성에 대한 실험적 연구

초록

The structural modes driven by the low-wavenumber components of smooth elastic wall pressure provide a relatively weak coupling between the flow and the wall motions. If the elastic thin plate has any resonant modes whose wavenumber of resonance coincides with ω/Uc, it will accept power from the flow in those modes of vibration. We examine the problem in which the elastic thin plate is subject to pressure fluctuations under turbulent boundary layer. Measurements are presented of the frequency spectra of the near- and far-field pressure contributed by the various wave modes. Their dependence on elastic properties of thin plate is presented, e.g. mass density of thin plate and tension applied to the plate. Lagrange's equation for wave motions of elastic plate was used to investigate the effect of bending wave on radiated sound of relatively low wave numbers.