Development of indirect EFBEM for radiating noise analysis including underwater problems
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초록
For the analysis of radiating noise problems in medium-to-high frequency ranges, the Energy Flow Boundary Element Method (EFBEM) was developed. EFBEM is the analysis technique that applies the Boundary Element Method (BEM) to Energy Flow Analysis (EFA). The fundamental solutions representing spherical wave property for radiating noise problems in open field and considering the free surface effect in underwater are developed. Also the directivity factor is developed to express wave’s directivity patterns in medium-to-high frequency ranges. Indirect EFBEM by using fundamental solutions and fictitious source was applied to open field and underwater noise problems successfully. Through numerical applications, the acoustic energy density distributions due to vibration of a simple plate model and a sphere model were compared with those of commercial code, and the comparison showed good agreement in the level and pattern of the energy density distributions.
Abstract
For the analysis of radiating noise problems in medium-to-high frequency ranges, the Energy Flow Boundary Element Method (EFBEM) was developed. EFBEM is the analysis technique that applies the Boundary Element Method (BEM) to Energy Flow Analysis (EFA). The fundamental solutions representing spherical wave property for radiating noise problems in open field and considering the free surface effect in underwater are developed. Also the directivity factor is developed to express wave’s directivity patterns in medium-to-high frequency ranges. Indirect EFBEM by using fundamental solutions and fictitious source was applied to open field and underwater noise problems successfully. Through numerical applications, the acoustic energy density distributions due to vibration of a simple plate model and a sphere model were compared with those of commercial code, and the comparison showed good agreement in the level and pattern of the energy density distributions.
참고문헌 (11)
- Belov, V. D., "Propagation of vibrational energy in absorbing structures", Soviet Physics Acoustics, 23(2), pp.115~119 (1977)
- Bouthier, O.M., "Models of space-averaged energetics of plates", American Institute of Aeronautics and Astronautics Journal, 30(3), pp.616~623 (1992)
- Cho, P. E., "Energy flow analysis of coupled structures", 박사, pp.1993
- Cremer, L., "Structure-borne sound" (2004), Springer-Verlag
- Lee, H. -W., "Energy flow boundary element method for vibration analysis of one and two dimension structures", Shock and Vibration, 15(1), pp.33~50 (2008)
- Nefske, D.J., "Power flow finite element analysis of dynamic systems : basic theory and application to beams", Journal of Vibration, Acoustics, Stress and Reliability in Design, 111(1), pp.94~100 (1989)
- Park, D. H., "Vibration power flow analysis of coupled plates and box-type structures", 석사, pp.1999
- Park, D. -H., "Power flow model and analysis of in-plane waves in finite coupled thin plates", Journal of Sound and Vibration, 244(4), pp.651~668 (2001)
- Seo, S. -H., "Power flow analysis of reinforced beam-plate coupled structures", Journal of Sound and Vibration, 259(5), pp.1109~1129 (2003)
- Wang, A., "Development of an energy boundary element formulation for computing high-frequency sound radiation from incoherent intensity boundary conditions", Journal of Sound and Vibration, 278(1- 2), pp.413~436 (2004)
- Wohlever, J.C., "Mechanical energy flow models of rods and beams", Journal of Sound and Vibration, 153(1), pp.1~19 (1992)