| Full-Frequency Band Acoustic Analysis of Sandwich Composite Structure Using FE-BEM and SEA Method |
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Dae-Oen Lee, Yoon-Kyu Lee, Hong-Il Kim, Jae-Young Kim |
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The 1st Research and Development Institute, Agency for Defense Development |
| FE-BEM 및 SEA 해석 기법을 활용한 샌드위치 복합재 구조물의 전 주파수 대역 음향 해석 |
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이대은, 이윤규, 김홍일, 김재영 |
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국방과학연구소 제1기술연구본부 |
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| Abstract |
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Increase in use of lightweight structures, coupled with the increased acoustic loads resulting from larger and longer range guided missiles, has made missile more susceptible to failures caused by acoustic loads. Thus, accurate prediction of acoustic environment and the response is becoming ever more important for mission success. In this paper, the acoustic response of a sandwich composite skin structure to diffuse acoustic excitation is predicted over a broad frequency range. For the low frequency acoustic analysis, coupled FE-BEM method is used where the structure is modeled using FEM and the interior and exterior fluid is modeled using BEM. For the high frequency region, statistical energy analysis is applied. The predicted acoustic level inside the structure is compared with the result from acoustic test conducted in reverberation chamber, which shows very good agreement. |
| Key Words:
Acoustic Anlaysis, Finite Element-Boundary Element Method, Statistical Energy Analysis |
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