请高人帮我讲解下radioss的超单元

zjay1126

现在有涉及到radioss的超单元，我只是偶尔听过，一直没在意，现在需要详细了解这个玩意，我找了半天radioss的帮助文档，结果没有找到～。
请哪个了解这个新玩意的高人帮我讲解下，这个“超单元”的具体功能，以及生成方法，在HYPERMESH里面具体在哪儿设置，以及材料属性等等～

先谢谢了。

zjay1126

没人知道么？
呵呵，我找到了

Topology Optimization of a Reduced Model using DMIG - OS-2070

The part to be reduced out of the model through the static reduction model reduction technique is referred to as a superelement.  In RADIOSS, ASET or ASET1 bulk data entries are required to indicate the boundary degrees of freedom of a superelement, meaning the set of degrees-of-freedom where the component (being replaced by direct matrix input) connects to the modeled structure.  Both the accuracy and the cost of static reduction increase as the number of ASET entries is increased.  For example, by using static reduction, the size of the matrix to solve will become smaller, but if the reduced matrix (DMIG) is very dense, then the solution time will become larger than the solution time for the full model where the matrix may be sparse.  Hence, the selection of ASET entries is very important in performing an efficient analysis using DMIG.

In order to prevent the reduced matrix from being too dense, ASET entries are chosen carefully (see the next figure) instead of creating ASET entries for all of the boundary nodes between the design and non design spaces.  Due to the small size of the problem used for this tutorial, the selection of ASET entries may not affect the solution time.

liminglaile

没人知道么？
呵呵，我找到了

Topology Optimization of a Reduced Model using DMIG - OS-2070

The part to be reduced out of the model through the static reduction model reduction technique is refer ...
zjay1126 发表于 2009-6-20 22:36

我正好也要告诉你这一个练习教程。其实简而言之也就是：利用弹性力学的叠加原理把部分已经单独计算好的结构组成部分作为一个超级“大单元”在附加回原来剩下的那一部分结构上去。据个简单的例子，就好像：一个结构A，由B和C两部分组成，现在首先计算出C部分的力学性能，然后把计算出来的C部分的结果按照边界条件等同的原则叠加回B部分上，在此基础上再计算B部分的力学性能，此时的计算结果便等同于直接完全计算结构A时的结果。十分简单。