mpc的疑问
譬如实际情况是载荷是加在一个面上的。模拟时在空间中新增了一个节点，然后把面上的节点和该节点用mpc中的BEB相连，将载荷加载在该节点上。
mpc的作用是面上节点和新增节点位移一致，我的疑问是该节点为什么会移动呢？
GRID POINT 517690 COMPONENT1 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101 (GP4)
GRID POINT 517690 COMPONENT2 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101 (GP4)
GRID POINT 517690 COMPONENT3 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101 (GP4)
GRID POINT 517690 COMPONENT4 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101 (GP4)
GRID POINT 517690 COMPONENT5 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101 (GP4)
GRID POINT 517690 COMPONENT6 ILLEGALLY DEFINED IN SETS US UB
*** USER FATAL MESSAGE 2101
请问 这是什么错误啊 ？谢谢了先！ 大江0520 发表于 2013-4-3 13:28 static/image/common/back.gif
GRID POINT 517690 COMPONENT1 ILLEGALLY DEFINED IN SETS US UB
** ...
The above grid point and component are defined in each of the above
dependent subsets. A point may belong to a maximum of one dependent
subset. This error occurs when a DOF is defined as belonging to
two mutually exclusive sets.
A common example of this occurs when a DOF is defined as dependenton
an MPC (M-set) as well as being constrained (s-set) on an SPC entry.
The message for this states that the component is illegally defined in
the um (user-defined m-set) and us (user-defined s-set) sets. These two
sets are mutually exclusive because all MPC equations are processed
before the SPCs are applied (exception is SOL 24) and the m-set DOFs
are removed from the matrix. When the program attempts pply the SPC,
the DOF is no longer available, and the FATAL message is issued. The
normal correction for this is to modify the MPC so that the DOF in
question is independent (N-set). Then there is no conflict.
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