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 elastic model based on the stiffness equation is presented, and the stiffness model of the whole structure is constructed via the stiffness assembly and coordination equation.
提出了大行程柔性铰链基于刚度方程的弹性模型，采用刚度组集的方法并通过建立协调方程，构建得到整体系统的刚度模型。
If mass or stiffness perturbation is considered to be a harmonic excitation, one has obtained a forced vibration equation to the original structure.
将质量和刚度摄动看成是对原结构的简谐激励，获得原结构广义坐标的受迫振动方程。
Revising the rotation displacement equation, the mass matrix and stiffness matrix of this kind of structure were derived by virtual principle.
采用虚功原理，通过对单元转角-位移方程的修正，推导了这种计算模型的单元质量矩阵和刚度矩阵。
Revising the rotation displacement equation, the mass matrix and stiffness matrix of this kind of structure were derived by virtual principle.
采用虚功原理，通过对单元转角-位移方程的修正，推导了这种计算模型的单元质量矩阵和刚度矩阵。
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