阻力矩阵法计算斜波入射下平板的声辐射

利用声辐射阻力矩阵和振动面上的速度矢量预报了结构声辐射的总功率.振动面等效为有限个活塞振动单元.通过计算,得到了嵌在无限大障板中简支板模型在斜波入射作用下的声辐射功率和辐射效率.利用阻力矩阵法,不仅避免了声场的计算,而且能达到经典法所能达到的精度.这样,在辐射计算经典方法所需的辐射声场难以测量的情况下,阻力矩阵法尤为有用.

Obliquely Incident Plane Wave Excited Rectangular Plate Sound Radiation Calculation by Using the Method of Acoustic Radiation Resistance Matrix

The acoustic radiation resistance matrix is combined with the velocity vector on a vibration surface to predict the total sound power radiated from the structure. In order to do so, the vibrating structure is simulated by a finite number of small piston sources mounted flush on the surface. Results are presented for the sound radiation efficiency and power of the modes of the rectangular baffled plate subjected to simply-supported boundary conditions when the plate is excited by obliquely incident plane wave. Finally, in the application of the resistance matrix, the calculation of the acoustic field has been avoided, giving a degree of accuracy comparable to the classical approaches. Therefore, for highly reactive sound fields, or in presence of high background noise, where the radiation is quite difficult to measure, the method presented here appears to be very useful for the determination of the sound radiated from structure.