The collection of vehicle deformation was previously using hand-drawn sketches, not therefore automatically be evaluated could and the deformation of the vehicle only complex had to be readjusted with special programs. All previous attempts to digitize the process of sketch-based deformation acquisition vehicle, immediately at the scene were unsuccessful. Conventional CAD systems and 3D modeling programs proved different reasons for it unsuitable. With a technology for mobile and computer-aided detection and modeling of vehicle deformation, information about the vehicle behavior in traffic accidents could be evaluated not only considerably faster and cheaper, but especially more complex and deeper. Through the insights so gained could weaknesses detected much easier of bodies and risks of the inmates and would in particular for the automotive manufacturer of great interest to the To be able to increase the level of safety of the produced vehicles. The Fraunhofer Institute developed the project idea in a one-year joint project for transport and infrastructure systems from Dresden and the Trans4mation IT GmbH, DefDesc technology, which can bridge the gap in the electronic survey process during traffic accidents. The new system DefDesc has three main features.
First, the software allows fast and effective digital collection of vehicle deformation at the accident site and allows a fast and automatic creation of 3D models of deformations on the spot on the basis of this information. Secondly, DefDesc can do the high-performance storage and quick access to the memory-intensive geometry and topology data of the spatial deformation of salvage vehicles. Thirdly, the system creates the conditions with the integrated interfaces for flexible evaluation of collected data for the different applications of accident research. The solution approach for the achievement of the project objectives was of the Fraunhofer team under the direction of Mr. Dr. Danowski came a complex data model for the description of the vehicle, as well as algorithms for calculating deformation developed and implemented in DefDesc. This distinction is made first between eight different types of vehicle, from the city to the small bus. An extension to other vehicle classes is however possible if necessary.
It was designed an inhomogeneous spatial projection grid, in the areas to steering axle, axle rear axle and rear axle to rear bumper front bumper has and is applicable to each type of vehicle. With the new 2D and 3D visualisation and tracking system DefDesc, it is now possible to collect spatial deformation data electronically directly to the accident site with laptops or Tablet PCs. To be marked on a total of six different 2D views of each car type, the corresponding deformation areas on the vehicle. From this information the system can calculate then a 3D model using algorithms, the deformation of the vehicle pictured are. Continue to specific interfaces to the established data collection software UNIDATO were created in the software development process, allowing the exchange of alphanumeric and graphical data seamlessly. By linking the three-dimensional deformation data of DefDesc with the accident data collected by UNIDATO, create completely new opportunities for accident research. It will in future be possible not only to collect all traffic accident data with a single application and maintain, but the information so obtained form the basis for still not possible until now complex damage analyses and evaluations.