关于groundcheck
有没有大侠知道groundcheck到底利用的什么原理?或是用了那些公式? 地面检查？初次听说楼主能大概介绍一下么，呵呵 Groudnchecking is usually used for validating the model. It is done by running a free-free modal analysis with groundcheck control card on. The format is like this way: GROUNDCHECK(SET=ALL,DATAREC=YES,RTHRESH=99.9)=YES
Datarec and RTHRESH are optional.
The model should show a minimum of six rigid body modes. With groundcheck card, Nastran will output G-set,N-set,F-set, and A-set. Each set will reveal some info about your model. For example, G-set normally implies spring (Celas) problem. It normally indicates non-coincident grids. N-set will tell you something wrong with your MPC setup. F-set is related to incorrect SPC (Remember that you are running Free-Free and you know what does this mean). A-set tells you that the model is constrained to the ground. I normally request "GROUNDCHECK=ALL" first, which outputs g-set only.
GROUNDCHECK (set=all) will output all DOF sets.
Hope this helps!
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