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发表于 2014-8-19 22:25:44
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来自 陕西西安
是“奇异”的问题吗?
PARAM,RBE3FREE can be used to disable ERROR 772 due to free spiders on RBE3 elements
Free spiders on RBE3 elements will singular in some cases. When AMSES or AMLS is used, this modeling error will lead to invalid results as the free spider will be AUTOSPC’ed. These results will be invalid because the RBE3 is now constrained due to the AUTOSPC. For Lanczos and static analysis, the singularity will cause errors 155 or 153 to be issued. PARAM, RBE3FREE,YES will change ERROR 772 into WARNING 824. If the free spider is singular, the run will fail with ERROR 155 or 153 for static analysis and Lanczos eigenvalue solutions. For AMSES and AMLS solutions, the AUTOSPC output should be carefully checked to make sure the RBE3 has not been constrained.
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