在进行有限元分析时遇到了错误，软件在形成元素刚度矩阵和加载矩阵后，在多 frontal 解决器阶段出现 LLT 分解失败。分析过程中发出多个关于节点可能奇异的警告，涉及节点的 DX、DY、DZ 和 RY DOF。尽管完成了10%的多 frontal 解决器，但最终因错误导致求解不完整，返回错误代码 -5。这表明模型可能存在数值稳定性问题或者几何问题，需要检查模型设置和数据输入。
发布于：2014-05-06 09:56:14
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-----------------------------------------S T A R T I N G S O L U T I O N
MULTI-FRONTAL SOLVER
AVAILABLE MEMORY = 358.0 MBYTES
ENTRY PHASE FOR RENUMBERING
ENTRY NUMBERING_EQN
ENTRY FORM_STIFF_MASS_LOAD
THE INDIVIDUAL ELEMENT STIFFNESS AND LOAD MATRICES WILL NOW BE FORMED.
ELEMENT NO. : 776 OF 776
ENTRY SOLUTION PHASE
ENTRY LOAD_BLOCK
TOTAL NUMBER OF VALID DOFS IN MODEL : 2648
ENTRY ASSM_STIFF_LOAD ( FORM GLOBAL EQUILIBRIUM EQUATIONS IN BLOCKS )
MFSFactorizerLLT : DPOPTRF: Unable to continue factorization!
MULTI-FRONTAL SOLUTION HAS BEEN PERFORMED 10 % .
WARNING : NODE NO. 260 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1525
WARNING : NODE NO. 260 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1523
WARNING : NODE NO. 260 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1522
WARNING : NODE NO. 203 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1179
WARNING : NODE NO. 202 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1177
WARNING : NODE NO. 202 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1175
WARNING : NODE NO. 202 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1174
WARNING : NODE NO. 159 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 915
WARNING : NODE NO. 159 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 917
WARNING : NODE NO. 204 RY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1189
WARNING : NODE NO. 204 DZ DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1187
WARNING : NODE NO. 204 DY DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 1186
WARNING : NODE NO. 157 DX DOF MAY BE SINGULAR.
WARNING : EQUATION NO. 903
INCOMPLETE MULTI-FRONTAL SOLVER
IERROR= -5
这是什么问题啊？求帮助
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