...键字: 细胞元;组集;非零元素;稀疏直接求解法;预处理共轭梯度法[gap=1269]Key words: cell element; assembly; non-zero element; sparse direct solver method; preconditioned conjugate gradient method..
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Spurious zero energy modes are present in the stress element, but it is proved that non spurious zero energy mode is present in the global analysis of the whole structure.
分析了应力元的多余零能模式，并证明了整体分析中对多余零能模式的消弭；
The Hammerstein model, which consists of a zero-memory non-linear element followed by a linear time-delayed plant, is one of the basic models that describe a non-linear characteristic.
该模型由一个无记忆非线性元件后接一个线性时滞环节组成，是描述非线性系统的一种基本模型形式。
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