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Frequently Asked Questions (FAQ)
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One support was defined at a node that is not part of the set of members in the window ‘1.7 Nodal Supports’ of RF-/STEEL EC3. In this case, it is necessary to define support at a node existing in the set of members or delete this nodal support in the window '1.7 Nodal Supports' of RF-/STEEL EC3.
In Figure 1, for example, a set of member supports was defined for the set of members 1 on nodes 2 and 7. When the calculation starts, the message 'Node No. 7 with support does not exist in the set of members No.1. Please correct this in Table 1.7.' appears (Figure 2, Figure 3).
In window ‘1.7 Nodal Supports’ of the RF-/STEEL EC3, it is possible to get displayed only the selected set of members by clicking the 'Show Only Current Object' button and the node numbering can be displayed by clicking the 'Local Coordinate System' button (Figure 4). It is obvious that the node 7 is not contained in the set of members. Instead of at node 7, the support must be defined on a node contained in the member set (for example, node 6).
To prevent the error message (Figure 1) from appearing and the calculation to be started, it is necessary to assign a material to the corresponding point elements as follows:
- Right-click the entire cross-section: 'Reduce Cross-Section into Elements', Figure 2
- Selection of the corresponding elements or all point elements with the status ‘Insert’ by using the Views navigator, because it is only possible to define a material for them (in contrast to point elements with the ‘Remove’ status)
- Assign the corresponding material and confirm with OK, Figure 3
- Deactivation of visibility
- Select all elements and right-click one of the selected elements: 'Create Cross-Section from Selected Elements', Figure 4
AnswerThe license drivers are digitally signed. If you try to install a new license driver that is missing in the existing signature of your operating system, a message appears.
To solve this problem, please perform a Windows update. After having restarted the operating system, the installation should be completed.
AnswerIt is possible that the user-defined profile database EigProf.dat is missing on your computer or it is damaged. Please open the 'Data Directories' tab of the program options and select the 'User-Defined Cross-Section Library' category.
Open the displayed directory and check whether the EigProf.dat file is available. If the file is available, please rename it.
If the path including the file does not correspond to the default path for RFEM 5.20 'C:\ProgramData\Dlubal\RFEM 5.20\General Data\EigProf.dat' in the program options, set this default path in the program options.
For the solid type 'Material', the material model 'Orthotropic Elastic/Plastic 3D' has to be assigned for timber (Figure 1).Since the solid object type 'Contact' is considered as a member within the program, it generally requires an isotropic material model (Figure 2).
In this case, the orthotropic material model is probably assigned to both the surfaces/solids and the members. However, members made of wood require an isotropic material model. Accordingly, another timber material has to be created and assigned to the corresponding members or cross-sections.
AnswerThe geometrically nonlinear flattening process takes over the real mesh geometry of the planar, buckling, single curved or double curved surface components from the selected cutting patterns and planarizes these planar components by minimizing the distortion energy assuming a defined material behavior.The iterative calculation used for this is controlled by the parameters in the menu "Calculation Parameters"/"Cutting Patterns" tab.The "Max Number of Iterations" parameter is limiting the scope of the calculation and stops the process when the set maximum iteration is reached. Provided the convergence criterion does not depend on the "Tolerance for Convergence Criterion" parameter in the Convergence range when the maximum iteration has been reached, the program displays error message 10154.If no error message is output by the program, it is reasonable to assume a proper convergence.The error can usually be solved by adjusting the flattening geometry or increasing the maximum number of iterations.
AnswerThis error is displayed when importing an update which is older than the last imported update.First, check in the Admin Control Center at http://localhost:1947 in Features if the modules you have purchased are already available.
Provided that not all of the purchased modules are available, please follow the instructions below:Network dongle (hardware dongle):
Please send us the C2V file, which you can create with the RUS tool, see:
https://www.dlubal.com/en-US/support-and-learning/support/faq/001479Network dongle (softlock):Please send us the C2V file, which you can create directly in the Admin Control Center, see:
In a dynamic analysis, you can only calculate the eigen modes as many degrees of freedom as the system has. With degrees of freedom, the number of mass points multiplied by the number of directions into which the masses act is meant.
A cantilever that is not split by the FE mesh has a mass point at the end. The action direction of the masses in RF-/DYNAM Pro is limited to the X and Y direction. Thus, the system has 2 degrees of freedom, so only 2 eigen-modes can be calculated.
Caution: In this case, the choice of the solution method is very important. In contrast to the "Root of Characteristic Polynomial" method, the Lanczos method can not calculate all eigenvalues of the system, but only n -1, which means in this example only 1 eigenvalue.
In order to generate the FE mesh, it is necessary to meet the following conditions in this case:
- Both contact surfaces must be modeled in parallel: all nodes, lines and integrated objects must match, even if an object at one of the contact surfaces is not used.
- To also generate the FE mesh in consideration of possibly unused objects, activate the "Integrate unutilized objects into surfaces" option in the FE mesh settings (see the figure).
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