A Modelling of Structural Excitation Forces Due to Wall Pressure Fluctuations in a Turbulent Boundary Layer

난류 경계층 내 벽면 변동 압력의 구조 기진력 모델링

  • 홍진숙 (국방과학연구소 2체계개발본부) ;
  • 신구균 (국방과학연구소 2체계개발본) ;
  • 김상윤 (연암공업대학)
  • Published : 2001.04.01

Abstract

It is essential to analyze structural vibrations due to turbulent wall pressure fluctuations over a body surface which moves through a fluid, because the vibrations can be a severe source of noise affecting to passengers in airplanes and SONAR performance. Generally, this kind of problems have been solved for very simplified models, e.g. plates, which can be applied to the wavenumber domain analysis. In this paper, a finite element modeling of the walt pressure fluctuations is investigated, which can be applied to those over arbitrary smooth surfaces. It is found that the modeled wall pressure fluctuation at nodes becomes uncorrelated at higher frequencies and at lower flow speeds, and the response is over-estimated due to the aliased power. Then the frequency range available for uncorrelated loading model and two power correction schemes are presented.

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