Study on Sound Power Radiated by Planar Structures in Moving Media
Based on the convective wave equation and Euler equation,this paper derives the radiation ellipse for distinguishing propagating waves and evanescent waves,as well as the formula for calculating the radiation sound power of planar structures in moving media. Based on this formula,the calculation of radiated sound power from planar structures in moving media can be achieved by extracting the wavenumber domain spectrum of surface nor-mal velocity within the radiation ellipse. Based on the radiation ellipse equation,the mechanism of the influence of moving medium on the radiated sound power of planar structures is clarified. Finally,taking a simply supported plate as the object,the radiated sound power under different moving velocities is compared through numerical sim-ulation. The results show the necessity of considering the influence of moving medium and its impact on sound power.
sound powermoving mediaradiation ellipsewave number domain
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