Abstract
Recently, importance of wind noise level is getting increasing. Wind noise has frequency range from about 200Hz to 5kHz. At low frequency, for predicting wind noise, finite element method can be applied by setting fluctuated surface pressure directly as input. At mid and high frequency, statistical energy analysis is suitable method because number of modes is high at the frequency. However, different to the case of finite element method, fluctuated surface pressure cannot be applied directly as input because of presence of 2 wavenumber component in turbulent flow. In this paper, we identify input power from SEA model and measured SPL distribution of compartment cavity in wind tunnel by solving SEA equation with constraints using Lagrange multiplier. Identified input is investigated by comparing with wavenumber-frequency spectrum computed from fluctuated surface pressure of CFD results. Convection and acoustic wavenumber component are observed. Taking into accout only acoustic wavenumber component reproduces identified pressure. It can conclude that main contribution to sound transmission is comming from acoustic wavenumber component.
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