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How to apply the correct boundary conditions? Who can teach us quickly?
The application of boundary conditions is a tricky subject and is based on pure engineering judgment, skill, and common sense. No university, consultant, or book can teach these things. This is something to be learned from practical and field experience. 100% involvement, thinking about the behavior of the component due to various forces, and checking after every iteration whether the FE model is behaving in the same way as in reality (displacement plots and strain gauge results for static analysis or natural frequencies and response comparison for dynamic analysis, etc.). If the model is not behaving correctly, then modifications in the boundary conditions are needed. Discussions with experienced CAE engineers, field engineers, and testing department engineers are also needed. In short, making mistakes and reworking and modifying the FE model again and again until satisfactory correlation is achieved is the true teacher.