ModelCompare is a plug-in for finite element (FE) pre-and post-processing tools. It compares two similarly discretized FE models and portrays their differences of geometry (mesh), material identifiers (ID), and thickness.
ModelCompare identifies the differences between the two models based on the geometry described by the mesh. It uses specialized mapping techniques that lead to extremely short run times.
Everybody involved in computer-aided engineering (CAE) has to deal with numerous designs that vary in geometry, material, and boundary conditions. ModelCompare is a quick-look tool capable of determining the differences between two FE models, which are discretized similarly. With ModelCompare, you can quickly compare two FE models within the visualization tool used without going through the burden of manually determining the differences. A report can be generated to document the changes.
At Fraunhofer SCAI, we thrive at the cross-roads of mathematics and data analysis. This enables us to provide cutting-edge tools that address the everyday needs of CAE engineers. They often need to compare and identify parts from different models when they analyze different simulation results. Therefore we developed this tool as one step of an overall simulation data analysis workflow.
ModelCompare is available as a plug-in for GNS Animator and can also be provided as a seamless, versatile interface for the visualization tool of your choice or as a stand-alone tool.
Geometry and mesh changes
Accurate estimation and depiction of the differences in the geometry of two FE models are made based on their nodal positions. Additionally, parts with the same shape but different mesh configurations are detected and displayed.
Duplicated parts in one model
Parts with the same shape and mesh, which occur several times in a model, are identified independently of their orientation.
Multi-parts detection
ModelCompare identifies a part in the first model that is split into many parts in the second model as a set consisting of these parts.
New and missing parts/elements
New parts that have been added to or parts that have been removed from the model are detected and visualized. Elements missing in a part in one model, e.g., due to improper meshing, are also detected. The tool also detects if an element belongs to two different parts in the two models.
Material-ID, thickness, or function changes
Differences in material-ID, thickness, or user-specified function values between both models are detected. Here, thickness changes can be part-based or element-based, while function values can come from nodes or elements.
Detection of changes in spotweld, RBEs, and adhesives
Differences in the attributes of the spot welds (e.g., part identifiers, element identifiers, connected parts) along with new, missing, and moved spot welds are identified and visualized. ModelCompare can also determine the differences in the positions of the master and slave nodes of the rigid body elements (RBEs). Hexa element-based adhesives can be identified, and changes such as added, deleted, and moved adhesives can be detected.
Reporting functionality
A pdf report can be generated during the comparison process. The report will display the parts that have changes in the geometry. These changes will be shown from four fixed camera view points, while in the full car the respective part will be high-lighted. Other changes will be integrated into the report in the near future.
Node and element function changes
One user-specified function over each node (or element) can be compared between the two models. The detected difference values will be displayed accordingly.
Changes in contours and holes
Changes such as cut, extended, added, and deleted contours can be detected. Similarly, changes in planar holes, such as closed, extended, new, and shortened holes, can be detected.
ASCII comparison
Input files contain additional information not covered by the geometric comparison, for example, transformation blocks, comment blocks, etc. A smart ASCII difference analysis handles such input blocks. Currently, PAM-CRASH is supported, whereas others such as LS-DYNA will be added.
All parts displayed are obtained from the open-source FE model of the Toyota Camry. |
Fraunhofer Institute for Algorithms and Scientific Computing SCAI