铺设角度对层合板结构声功率的影响分析

针对层合板结构铺设角度对前二阶声辐射模态幅值和辐射声功率的影响进行分析。利用分层理论结合有限元模型求解层合板的铺设角度与振动速度信息之间关系。通过声辐射模态理论,以某12层层合板结构为例,研究固定边界条件下的层合板辐射模态数、对称铺设角度、单向铺设角度以及激励力位置对声辐射模态幅值和辐射总声功率的影响。计算结果表明,在相同角度下,对称铺设层合板结构最大声功率值要小于单向角度铺设层合板结构最大声功率值;另外在低频时,对层合板结构辐射声功率起主要贡献的是前两阶辐射模态。并以某16层零度铺设的固定边界条件下的层合板结构为例,对复合材料层合板结构的声辐射模态幅值及声功率进行试验分析。

Influence of Laying Angle on Acoustic Radiation Power of Laminated Composite Plates

The influence of the laying angle on the first two order acoustic radiation mode’s amplitudes and radiation sound powers of laminated composite plates are studied. The layer-wise finite element model is imposed to determine the relation the laying angle and velocity distributions of laminated composite plates. Based on the acoustic radiation mode’s theory, a twelve-layer fixed boundary laminated plate is used as an example, radiation mode’s number, the effects of symmetrical laying, one-way laying, and the location of exciting force on the first two orders acoustic radiation mode’s amplitude and sound power of the laminated composite plates are then discussed. The numerical simulations results show that it is found that under the same laying angle, the maximum sound power of the symmetrical laying of laminated plate is less than the value of one-way laying angle of laminated plate. In addition, at low frequency the main contribution to the total sound power is the first two order radiation modes. A sixteen layer zero degree fixed boundary laminated plate is used as an example In the experiment the first two order acoustic radiation mode’s amplitudes and total radiation sound power of the plate are measured.