ABAQUS中如何添加非反射边界条件

非反射边界条件需要同时设置damping和spring，根据你的模型要求，设置的参数和模式都不一样。你得多介绍一下你的要求，参考一下如下手册上的内容。看是否是你所需要的。

具体的在手册的如下章节。看看以后，你可能会有所启发。

6.3.4 DIRECT-SOLUTION STEADY-STATE DYNAMIC ANALYSIS

Damping

If damping is absent, the response of a structure will be unbounded if the forcing frequency is equal to an eigenfrequency of the structure. To get quantitatively accurate results, especially near natural frequencies, accurate specification of damping properties is essential. The various damping options available are discussed in “Material damping,” Section 25.1.1.

In direct-solution steady-state dynamics damping can be created by the following:

• dashpots (see “Dashpots,” Section 31.2.1),

• “Rayleigh” damping associated with materials and elements (see “Material damping,”

Section 25.1.1),

• damping associated with acoustic elements (see “Acoustic medium,” Section 25.3.1“Infinite

elements,” Section 27.3.1and “Acoustic and shock loads,” Section 32.4.6),

• structural damping (see “Damping in dynamic analysis” in “Dynamic analysis procedures:

overview,” Section 6.3.1), and

• viscoelasticity included in the material definitions (see “Frequency domain viscoelasticity,”

Section 21.7.2).

When a real-only system matrix is factored, all forms of damping are ignored, including quiet

boundaries on infinite elements and nonreflecting boundaries on acoustic elements.

实话说，这个getsequencefrommask(...)没有什么用。这里的‘#1’是abaqus

cae内部的一种编号。不便记忆，而且在你添加feature改变geometry的时候，边的编号可能会改变。

建议你用findat函数，按照空间坐标找边。这样更有逻辑性。

假定粱在XY平面内，粱沿X方向放置，左边固定饺支座，右边滑动饺支座，那么边界为：左边（u1=0，u2=0），右边（u2=0），如果是平面粱，还应限制整根粱Z向位移，以及粱绕X轴的转动。

ABAQUS 有两个主求解器模块— ABAQUS/Standard 和 ABA

QUS/Explicit。ABAQUS 还包含一个全面支持求解器的图形用户界面，即人机交互前后处理模块 — ABAQUS/CAE 。 ABAQUS 对某些特殊问题还提供了专用模块来加以解决。

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