Analytical formulations for annular disk sound radiation using structural modes
Analytical formulations for annular disk sound radiation using structural modes
复制标题
使用结构模式的环形盘声辐射的分析公式
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
Rajendra Singh
中科院分区：
文献类型：
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作者：
Ming;Rajendra Singh
本文分析了计算机磁盘中环形圆盘的声辐射特性。采用远场法和辐射阻抗法计算了圆盘在弹性模态和刚体模态下振动时的辐射声。模态声功率是通过近似结构模态函数来表示的，并表示为波数的幂级数。预测表明，轴对称振动模式是更有效的辐射器相比，那些非对称盘模式，具有相同数量的节圆。边界元程序获得的数值结果被用来支持分析预测。公式也扩展到包括模态耦合和源旋转效应。当激励多个振动模态时，圆盘振动模态之间的耦合对辐射声的影响是显著的。本文提出了一个简单的经验公式，可用来预测旋转圆盘在选定工况下的模态声辐射效率。
Sound radiation characteristics of an annular disk with application to the computer disk are examined analytically. The far‐field and the radiation impedance approaches are employed to calculate radiated sound of a disk vibrating at its elastic or rigid body modes. Modal sound power is formulated by approximating the structural modal functions and is expressed in terms of a power series of the wave number. Predictions show that axisymmetric vibration modes are more efficient radiators compared to those asymmetric disk modes that have the same number of nodal circles. Numerical results obtained by a boundary element program are used to support analytical predictions. Formulations are also extended to include the modal coupling and source rotation effects. The effect of coupling between disk vibration modes on the radiated sound is found to be significant if multimodes are excited. A simple empirical equation has been developed to predict the modal sound radiation efficiency of a rotating disk for selected ...