同尺寸弯振圆盘辐射声场指向性研究

摘要

对薄圆盘的弯曲振动和辐射声场的特性进行了研究，推导出了三种边界条件下圆盘辐射声场指向性的数值表达式，编制程序并研究其声辐射特性。结果表明，相同尺寸不同边界条件下圆盘指向性的尖锐程度不同，固定边界条件下圆盘辐射声场指向性最佳，自由边界条件下较差，并且随着圆盘模式和几何尺寸的增加各边界条件下圆盘的指向性均逐渐变差。%Flexural vibration and radiated sound field of a flat circular plate were study, the directivity pattern of a flat circular plate with flexural vibration under the three boundary condition is derived , and a computer program is developed, which can study on the radiated sound field. The results showed that the acuity of the directivity patterns is different under the same size of the flat circular plate, that fixed conditions is best, and free boundary conditions is worst.However, the directivity pattern of flat circular plate becomes poor when the vibrational order and the siae of the flat circular plate in flexural are increased.