Normal cannot be computed in 1 elements. The nodal coordinates may be incorrect or the element aspect ratio may exceed 1000 to 1. The elements have been identified in element set ErrElemNormal

A temporary directory for the RSG plug-in could not be created; therefore, it was not registered

解決方法：

頻率計算錯誤

The eigenvalues cannot be found. This could be caused due to instabilities in the base state

錯誤原因：約束不夠

解決方法：增加約束（找出模型中約束不足的地方，尤其是耦合的位置）

提取頻率錯誤：THE LANCZOS SOLVER HAS FAILED TO FIND ALL THE EIGENVALUES

解決辦法：在如下關鍵詞中

*Frequency, eigensolver=Lanczos, acoustic coupling=on, normalization=displacement, number interval=1, bias=1.

10, , , , ,

刪除“, number interval=1, bias=1.”語句即可

先一般分析后屈曲分析：MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED.

錯誤信息：MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A *BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA *BOUNDARY, *CLOAD, *DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE ABAQUS/STANDARD USERS MANUAL（翻譯：質量或差分剛度矩陣完全為空。特征問題無法求解。在*屈曲分析中，最可能的原因是沒有通過*boundary、*cload、*dload 等指定非零加載模式。參見 ABAQUS/STANDARD 用戶手冊中的特征值屈曲預測）

解決辦法：將圖中的step-2的“靜力通用”改成“屈曲分析”

收斂問題

2023.12.21→→Too many increments needed to complete the step（需要更多增量步完成計算）

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