A Novel Approach for High Frequency Interior Noise Prediction

Since Statistical Energy Analysis (SEA) is based on lumped parameters, acoustic responses predicted by SEA are spatially discontinuous. However, in many practical applications, the ability to predict spatially continuous energy flow is useful for guiding the design of systems with improved acoustical characteristics. A new approach, utilizing integral equations derived from energy flow concepts, is developed to predict the continuous variation of acoustic field such as sound pressure level in the interior of acoustic domains using structural response predicted by SEA. The computer code developed based on energy flow boundary integral equations is initially validated by analyzing sound propagation in a duct. Subsequently, interior noise levels within simplified airplane cabin and generic cargo van models are predicted using SEA alone and the present hybrid approach that combines SEA and Energy Boundary Element Analysis (EBEA) to highlight the validity and utility of the present approach.