单元类型------弹簧阻尼单元
求解方法
静态线性问题 特征值问题 瞬态分析方法:隐式和显式
静态线性问题
Solve KD=F for D
– Gauss elimination – LU decomposition – Etc.
自由振动分析(特征值分析)
0 KD MD
Assume
单元类型------壳单元
定义壳单元关键字所需要的参数: *ELEMENT_SHELL • 壳单元的ID号。 • PART的ID号 • 4个节点的ID号
*ELEMENT_SHELL $# eid pid n1 n2 n3 n4 3639 8 7781 7783 7785 7780 3640 8 7780 7785 7776 7777 3641 8 7769 7786 7784 7768
瞬态分析方法
Structure systems are very often subjected to transient excitation. A transient excitation is a highly dynamic time dependent force exerted on the structure, such as earthquake, impact, and shocks. The discrete governing equation system usually requires a different solver from that of eigenvalue analysis. The widely used method is the so-called direct integration method.
初速度定义