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低频时,控制振动结构第一阶声辐射模态伴随系数可有效控制总声功率。通过分层有限元模型可以求解层合板的位移模式。对层合板的固有频率和动态响应进行了理论推导。结合声辐射模态理论,研究了层合板铺设角度、弹性模量比、跨厚比以及阻尼比等结构参数对层合板结构第一阶声辐射模态伴随系数的影响。计算结果表明,分层理论结合有限元方法可以较准确地计算层合板固有频率,而且铺设角度和跨厚比对层合板结构声辐射模态影响较大。
At low frequency, the first-order acoustic radiation mode accompanying the control vibration structure can effectively control the total acoustic power. The layered finite element model can be used to solve the displacement pattern of laminate. The natural frequency and dynamic response of laminates are theoretically deduced. According to the theory of acoustic radiation, the influence of structural parameters such as laying angle, elastic modulus ratio, cross-section ratio and damping ratio on the first-order acoustic radiation mode coherence coefficient of laminate was studied. The calculation results show that the layered theory combined with the finite element method can calculate the natural frequency of the laminate accurately, and the influence of laying angle and cross-thickness ratio on the acoustic radiation modes of the laminate structure is larger.