However, for the composite load has the characteristics of complex composition, random time variance and spread over different area, its exact mathematics model is still not built up.
然而，系统中的综合负荷，由于具有构成复杂、随机时变、地域分散等特点，其准确的数学模型一直没有建立起来。
Design of flutter model from aircraft metal structure to composite structure can be achieved by equation of stiffness, yet it may cost much time for general design method.
金属飞机结构到复合材料结构的颤振模型设计，要求采用刚度等代法来完成，然而一般的设计方法通常需要消耗大量时间。
The substructure method was introduced to set up mathematical model of finite periodic composite structure, to solve its wave equation, and to derive its time-average power flows.
采用子结构法，建立了有限周期复合结构的数学模型，求出了数学模型的波动解，并推导出模型的时间平均功率流。
At the same time, it is illuminated that element type, gridding partition and coupling manner used in ANSYS model can be used in calculation and analysis of steel bamboo composite structures.
同时也说明了本文中ANSYS建模时所采用的单元类型、网格划分、耦合方式均可以用于同类组合结构的计算和分析。
At the same time, it is illuminated that element type, gridding partition and coupling manner used in ANSYS model can be used in calculation and analysis of steel bamboo composite structures.
同时也说明了本文中ANSYS建模时所采用的单元类型、网格划分、耦合方式均可以用于同类组合结构的计算和分析。
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