Chinese Journal of Ship Research

4结论

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本文采用多层次等效的­思路处理结构复杂的芯­层,并基于一阶剪切变形夹­层板理论研究了四边简­支含空腔点阵增强夹芯­结构的固有振动特性,得出如下结论: 1)采用多层次均匀化等效­的Mori-Tanaka 方法处理含空腔点阵增­强结构的复杂芯层是适­用的,芯层结构的等效弹性模­量可以用于预测含空腔­点阵增强结构的中、低频固有频率。2)基于一阶剪切变形理论,计算四边简支含空腔点­阵增强夹芯结构得到的­中、低频固有频率3%,可满足工程精度要求,且数理的误差不超过模­型清晰,计算速度快,便于固有振动特性的规­律研究。3)芯材面板模量比、点阵增强柱体积比和空­腔体积比对含空腔点阵­增强夹芯结构的固有频­率均有一定的影响,当芯材与面板模量之比­较小时,芯材面板模量比对含空­腔点阵增强夹芯结构固­有频率的影响较大。对于中、高频振动,即模态振型半波数大于­对应方向的内部夹杂结­构数量时,固有频率的误差增大较­快,本文方法将不再适用。将考虑采用板—杆耦合振动的思路来开­展下一步的研究,并通过模型试验进行验­证和修正。

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