Based on the four-element model, the equation of the stress relaxation process is developed using the principle of Boltgation superposition in this paper.
以四元件模型为基础，利用玻尔兹曼叠加原理建立了纱线应力松弛变化过程的理论方程，并分别对彩棉喷气涡流纺及环锭纺纱线进行松弛实验。
First carry on the self libration analysis to the bridge, use spatial four nodes elastic shell element SHELL63 and spatial two nodes elastic beam element BEAM44 to model the bridge.
首先对大桥进行自振特性分析，分别采用空间四节点弹性壳单元SHELL63和空间二节点弹性梁单元BEAM 44单元进行建模。
Four-node degenerated shell element and rigid shell element are used in our FEM model.
四结点蜕化壳单元和刚体壳单元分别用来建立权和模具的有限元模型；
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