最后通过线性参变控制，获得了用有限维数线性矩阵不等式描述的充分条件。
A sufficient condition is obtained using finite dimension linear matrix inequalities (LMI) describing by linear (parameter-variety) control.
利用变分原理，推导了两节点二维曲梁单元几何非线性的单元切线刚度矩阵。
From the variation principle, an analytical solution of the tangential stiffness matrices with nonlinear effects geometrically, for two-nodal two-dimension curved beam element, has been derived.
计算结果表明，引入了属性矩阵和变超松弛系数的迭代算法能够更好地重建三维温度场。
The calculating results indicate that the 3-d temperature field can be reconstructed more accurately by the algorithm with property matrix and unfixed ultra-relaxation coefficient.
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