CRACKED STRUCTURE-ACOUSTIC COUPLING PROBLEMS BY HYBRID FRACTAL FE AND BE METHODS

The effective control of noise and vibration in structural acoustic systems depends largely on the accurate evaluation of the sound-structure interaction, which is characterized by the energy transferred between the acoustic field and the structure. This article reports on a study in which cracked elastic structure-sound interaction problems are investigated by employing the hybrid fractal FEM (finite element method) and BEM (boundary element method). The degrees of freedom of the system can be reduced greatly through adopting fractal FEM in discretizing the cracked elastic structure; while the exterior acoustic field is calculated by BEM, which automatically satisfies Sommerfeld's radiation condition. Two numerical analyses were performed. The results show that the resonant frequency of the cracked structure-acoustic system occurs at a lower value than for structures without cracks, and decreases as the crack depth increases. The effect of the crack on the acoustical pressure amplitude was more intense in the vicinity of the crack tip.

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  • Corporate Authors:

    Science Press

    Beijing 100707,   China 
  • Authors:
    • Guorong, W
    • Weifang, Z
  • Publication Date: 2004-12

Language

  • English

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Filing Info

  • Accession Number: 00989063
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 2 2005 12:00AM