摘要
由于面内波的尺度通常大于面外波的尺度,目前板结构基于有限元的能量流分析忽略面内运动,这种处理方法在一些情况下并不合理。本文根据薄板的经典理论,将面内运动和面外运动进行解耦,然后建立了两种运动的有限元能量流模型,最后通过能量平衡方程获得了板结构弯曲子系统的耦合损耗因子计算格式。算例分析表明,本文方法能较准确计算面内运动能量与面外运动能量,可为后续的耦合损耗因子提供更加准确的计算方法。
As a result of the in-plane waves length are longer than the out-plane waves length in most time, at present the in-plane motions of plate structures are ignored in the energy flow analysis based on finite element,but this approximation is not rational in some particular condition. Based on the traditional theories of lamina, the in-plane and out-plane motions are uncoupled in this paper, then two energy flow models of these two types motion are deduced, and the coupling loss factor of bending waves are given by energy balance equations. The numerical example shows that the method presented by this paper can calculate the in-plane and out-plane energy , then this method can be a more accurate calculation method for the coupling loss factor .
出处
《强度与环境》
2014年第2期1-8,共8页
Structure & Environment Engineering
基金
总装"十二五"预研项目51334050101
国防973项目613133
关键词
有限元
能量影响系数
面内运动
面外运动
耦合损耗因子
finite element
energy influence coefficients
in-plane motion
out-plane motion
coupling loss factor
