In the development process of headlamps not only decisions about volume or shape of outer lens and housing are necessary in an early state of the project, to an increasing degree also the internal styling and the lit and unlit impression of the headlamp should be fixed before starting any tool. Therefore the need for sufficient simulation tools is increasing. The calculation of the light pattern and the photorealistic visualization is already state of the art in the lighting development. Further simulation tools e.g. for heat dissipation of outer lenses, stray light investigations or the visual impression of the lit function have been developed. In the paper the development process of an automotive lighting system is decribed together with examples of simulation in the concept and design phases. The examples shown demonstrate that the results of simulations can not be taken automatically as true. The correlation between simulation results and the reality has to be worked out. This has to be done for algorithms and for light source models. But even then simulations can not show exactly the results which will be measured or seen later with parts. One point is the agreement of the CAD data used for simulation with the shape of the real parts having some tolerances. Also the quality of the surfaces (e.g. lacquered and metalized reflectors) will never be exactly like the theoretical description. For the application of simulations time can also be a restrictive point. This does not only mean the time for the calculation itself but also the time to prepare the data for simulation. Another field for further development of the tools is the simulation of surfaces with diffuse reflection. The simulation of direct reflections works very well, for surfaces with flutes or with structures new models have to be developed and verified. For structured or opaque materials further improvements of the simulation tools are necessary.
Virtual world and reality in the lighting development process
Virtuelle Welt und Realität im Entwicklungsprozess von Beleuchtungsystemen
2005
10 Seiten, 7 Bilder
Conference paper
English
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