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THE AUTOSIM PROJECT Fig. 4.5.2.1: Simulation Data and Process Management (courtesy of MSC Software) Fig.4.5.2.1 shows a sample process map of a generic crash simulation process with both simulation data objects (green circles) and simulation process actions (blue boxes). SDM should manage the simulation data, and also offer the possibility of managing the simulation processes. This is particularly important for increasing confidence in simulation data, as it makes simulation processes repeatable and, thus, results easier to compare. It should be noted that, especially in early design phases, appropriate CAD data may not be available yet. For this reason any SDM system must be flexible enough that input data for building simulation models can come from different sources, not necessarily from PDM systems only, but of course desired in the future. To enable a total procedure to become faster, an integrated software environment is needed. For example, the physical layout needs to be done rapidly either using CAE or (semi-)analytically or with symbolic CAE when only some basic data is available (Fig.4.5.2.2). Very often in a typical new vehicle, in order to encourage design work using CAE during early development phases, parametric vehicle-concept models are desirable because they allow conceptual, geometric modifications to be evaluated rapidly at a time when no CAD data is yet available. Such tools should allow concept modification cycles (i.e. variation of parametric vehicle concepts) on data available either from predecessor models or from scratch (Fig 4.5.2.2). SIXTH FRAMEWORK PROGRAMME PRIORITY [6.2] [SUSTAINABLE SURFACE TRANSPORT] 012497 AUTOSIM 47 |
CURRENT & FUTURE TECHNOLOGIES IN AUTOMOTIVE ENGINEERING SIMULATION In a typical vehicle development process, design constraints are at a minimum in the very early or conceptual phase. The lack of design constraints during the early vehicle development stage can be used to advantage, allowing for more exploration and optimization on a large scale. A good innovative process that takes the proper software tools and integrates them around a new vehicle development process has the potential to yield better body structure design with lower mass, higher performance, and wider bandwidth (Ref. [14]). Fig.4.5.2.2: Parameterized Car Body Models (courtesy of SFE GmbH)) Later in production development, “conventional” CAD and CAE methods need to be used to confirm functional reliability, further and final optimization, and production capability of the concept design. 4.5.3 Clearly Defined Materials Characterisation Methodology Along with the geometric representation of the vehicle structure, the approach taken to characterise the materials chosen for the vehicle is critical to achieving a reliable, accurate and robust digital model. The demand for models with greater predictive capabilities to be used ever earlier in the design phase therefore brings the topic of material characterisation to the fore. Not only are there other objectives detailed in this chapter inherently dependent on the reliability, accuracy and cost of material characterisation, but the long-term competitiveness of the automotive industry depends on 48 | SIXTH FRAMEWORK PROGRAMME PRIORITY [6.2] [SUSTAINABLE SURFACE TRANSPORT] 012497 AUTOSIM
Page 1 and 2: Current & Future Technologies in Au
Page 3 and 4: The Consortium Steering Committee w
Page 5 and 6: 4.5 How To Move On ................
Page 7 and 8: CURRENT & FUTURE TECHNOLOGIES IN AU
Page 51: CURRENT & FUTURE TECHNOLOGIES IN AU
Page 85: APPENDIX 1: GLOSSARY OF TERMS • U

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