Test-based modelling and substructuring
The substructure models for each mount, the electric engine, and the TMB have been obtained using DIRAC. The virtual point component models have then been substructured into one vehicle assembly. This model was compared with validation measurements in the full vehicle for microphones and sensors mounted in the car. The substructured FRFs from the engine into the car where matching the validation almost perfectly. These FRFs were then used to calculate blocked forces for the interface between the engine and the mounts.
Benefits of using DIRAC
To generate high-quality component models, we used our measurement software DIRAC with the live connection to a PAK MK2 measurement system. This allowed to make all virtual point models “first-time-right”, as all needed quality information is available live and any measurement errors could thus be identified and resolved right away. As the project concerned a benchmark vehicle, CAD geometry was not available from design. Instead, 3D scanning was used to generate STL geometry files as the import for DIRAC. This can be seen in the screenshot below.