Mobility Characteristics Analysis of Stiffened Laminated Composite Plates for Ships
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摘要: 应用有限元法对加筋复合材料层合板结构进行固有振动特性和导纳特性分析。基于一阶剪切理论的复合材料层合板理论，采用4节点Mindlin壳单元进行结构离散，通过动力学原理建立结构动力学有限元方程，并编制出相应的计算机程序。针对双向加筋复合材料结构进行分析，讨论不同结构模态阻尼系数、不同激励位置、不同边界条件和加筋的疏密程度对结构原点导纳及跨点导纳的影响。依据计算结果，可以进一步研究舰船复杂结构振动能量的传递和隔振效果，为追求最佳振动和声学设计提供分析方法。
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关键词:
- 复合材料层合板 /
- 一阶剪切理论 /
- Mindlin壳单元 /
- 原点／跨点导纳
Abstract: The natural vibration and mobility of stiffened laminated composite plate were investigated with the finite element method. Based on the first-order shear deformation theory for laminated composite plate, Mindlin shell elements with four nodes were utilized to obtain a discrete structure. Also the finite element dynamic equations of structure were formulated, and computer code was developed. The facts that the driving-point mobility and transfer-point mobility of the structure varies with the change of factors, e.g. stiffened plate＇s damping, exciting position, boundary condition and the number of the stiffened beams, were discussed. The calculation results could be used as a basis for further research of efficiency of power transfer and vibration isolation. A method for optimum design of vibration and acoustics could be obtained. -
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