ABAQUS定义阻尼的四种方法
**阻尼建立方法**-----------------------------------------------------------------------------------
**（1）直接法-DIRECT
*MODAL DAMPING,MODAL=DIRECT
1,10,0.04
11,20,0.05
***(1)起始模态序号；(2)截止模态序号；(3)模态阻尼比
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**（2）瑞雷阻尼-RAYLEIGH
*MODAL DAMPING,MODAL=RAYLEIGH
1,10,0.2525,2.9E-3
11,20,0.2727,3.03E-3
***(1)起始模态序号；(2)截止模态序号；(3)模态质量比例系数；(4)模态刚度比例系数。
**-------------------------------------------------------------------------------------
**（3）复合阻尼-COMPOSITE
**a---------------------------
*MATERIAL,NAME=STEEL
*DAMPING,COMPOSITE=S
***S为材料“steel”的临界阻尼比
**b---------------------------
*MODAL DAMPING,MODAL=COMPOSITE
**--------------------------------------------------------------------------------------
**（4）结构阻尼
*MODAL DAMPING,STRUCTURAL
m1,m2,s
***(1)起始模态序号；(2)截止模态序号；(3)结构阻尼因子
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