Linear constant-coefficient differential equations 线性常系数微分方程
variable coefficient differential equations 变系数线性微分方程组
constant coefficient linear differential equations 常系数线性方程
variable coefficient linear differential equations 变系数线性微分方程
Second-order coefficient-changed partial differential equations 二阶变系数偏微分方程
In this paper, the exact analytic method is suggested to solve variable coefficient differential equations under arbitrary, boundary condition.
本文首次提出精确解析法，用以求解任意变系数微分方程在任意边界条件下的解。
Therefore, the differential equations 'coefficient matrix of the free vibration of the spatial rigid body is automatically formed, and free vibration frequency and its type can also be found out.
最后自动组成空间刚体自由振动微分方程的系数阵，并计算出刚体的自振频率和振型。
It doesn't need the variational principle and can be applied to solve non-positive or positive definite partial differential equations with arbitrary variable coefficient.
该方法不用一般的变分原理，可适用任意变系数正定和非正定偏微分方程。利用这一方法得到一个新的八节点四边形平面应力单元。
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