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ABAQUS中的各种阻尼的认识

作者:管理员    发布于:2014-12-22 02:10:24    文字:【】【】【

一、材料阻尼

1.瑞雷阻尼(Rayleigh damping
1)质量阻尼Alpha:消除低频区
*DAMPING, ALPHA= 
2)刚度阻尼Beta:消除高频区
*DAMPING, BETA=

一般可取结构前十阶频率进行计算

2.结构阻尼
结构阻尼适用于频域动力分析。
它的假定是阻尼力和结构力成正比,和速度成反比,即该阻尼适用条件是位移和速度的相位相差90度【重要!务必注意】。
Use the following option to define damping by specifying mode numbers:
*MODAL DAMPING, STRUCTURAL, DEFINITION=MODE NUMBERS
Use the following option to define damping by specifying a frequency range:
*MODAL DAMPING, STRUCTURAL,DEFINITION=FREQUENCY RANGE

二、数值阻尼(无物理意义)

1.直接积分动力分析(隐式)
HHT
求解法,引入数值阻尼参数alpha,该值同前述的不一样。该值同时间增量和周期的比值有关。
*DYNAMIC, ALPHA=

2.显式积分动力分析
引入体积粘度来控制高频振动。
Use the following option to define bulk viscosity for the entire model:
*BULK VISCOSITY
Use the following options to define bulk viscosity for an individual element set:
*BULK VISCOSITY
*SECTION CONTROLS

三、模态叠加求解法中的阻尼

1.临界阻尼比例
Use the following option to define damping by specifying mode numbers:
*MODAL DAMPING, MODAL=DIRECT,DEFINITION=MODE NUMBERS
Use the following option to define damping by specifying a frequency range:
*MODAL DAMPING, MODAL=DIRECT,DEFINITION=FREQUENCY RANGE

2.瑞雷阻尼
Use the following option to define damping by specifying mode numbers:
*MODAL DAMPING, RAYLEIGH, DEFINITION=MODE NUMBERS
Use the following option to define damping by specifying a frequency range:
*MODAL DAMPING, RAYLEIGH, DEFINITION=FREQUENCY RANGE

3.复合模态阻尼
*DAMPING, COMPOSITE= *MODAL DAMPING, MODAL=COMPOSITE

4.结构阻尼
Use the following option to define damping by specifying mode numbers:
*MODAL DAMPING, STRUCTURAL,DEFINITION=MODE NUMBERS
Use the following option to define damping by specifying a frequency range:
*MODAL DAMPING, STRUCTURAL,DEFINITION=FREQUENCY RANGE

最后引用ABAQUS的一句原话:
In direct-integration dynamic analysis you very often define energy dissipation mechanisms—dashpots, inelastic material behavior, etc.—as part of the basic model. In such cases there is usually no need to introduce additional damping: it is often unimportant compared to these other dissipative effects

 
 
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