EHTC Conference: “Correlation of Simulation Models using Concept Modeling"

Pre-requisite for efficient vehicle programs is the CAE driven development process as described in [1], [2] "Up Front CAE". Both CAD and CAE models based on special Concept Software as SFE CONCEPT are used to analyze the attribute performance as safety, NVH or durability and commodity studies concerning the weight, manufacturing, or package. A database of concept models is used to minimize the modeling effort and to maximize the re-usability of components [3].  The accuracy of the models increases over time and leads to an increasing amount of available Concept models in databases. Due to the increased acceleration of the development process, these models are critical in providing direction on vehicle architecture in the early stages of a program.

Due to the high importance of these decisions it is mandatory to trust the results of this early CAE models. Correlation of this Concept models to test or reference mainstream CAE models creates the confidence in this approach. The correlation focuses on two aspects: 1. the level of detail required to capture the detailed folding characteristic of the structure (e.g. siderail or B-Pillar) and 2. the process chain used to process the raw output from SFE Concept into RADIOSS Include files (e.g. gap, contacts, spot-welding, adhesives, bolts). This process chain is implemented using HyperMesh in batch mode, details may be found in [4]. This process chain is tuned to latest program modeling approaches and to meet the desired correlation status.

In this presentation RADIOSS safety concept models are correlated to different impact modes.  Tools and methods are explained focusing on both the automated evaluation of simulation output and the judgment of the correlation quality.  The main criteria defining the correlation fitness are video overlay of vehicle and dummies kinematics, curve comparison of vehicles acceleration, velocity, and intrusion. Furthermore the dummy sensors have been evaluated.

The combination of the above mentioned steps enable an accelerated and more confident concept phase allowing for more alternatives being analyzed in a more holistic and detailed manner as described in [5], [3].  This is a pre-requisite for the creation of efficient designs under the constraints of an increasingly accelerated development process.

The Author

Dr. Jörgen Hilmann, Joseph Abramczyk, Ford Motor Company
Dr. Salvatore Scalera, RLE International
Andreas Arlt, SFE GmbH Berlin

<< Back