SFB 871: Regeneration of Complex Capital Goods

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The CRC 871 “Regeneration of Complex Capital Goods” develops the scientific basics for maintaining complex capital goods. The objective is to maintain or to restore as many components as possible of the over-all system, so that functional characteristics of the capital goods will be “regenerated”, or even be improved.In the first funding period of the CRC 871, commercial turbofan jet engines were chosen as an application example, due to their high complexity. The engineering disciplines involved are pushed to their current limits in physical knowledge and design methods for these complex machines. On the one hand, this comprises the computational verification of the functionality of the regenerated components, as well as the determination of the effect of the regeneration on the technical and economical objectives (in terms of specific fuel consumption or life time of the components). On the other hand, there are also regeneration-specific challenges in material sciences and production engineering. The innovative approach of the CRC 871 goes beyond current technical and scientific standards. In addition to the improvement of individual regeneration processes, all possible courses of action are considered for rule-based decisions. Depending on the component’s condition, the decision includes whether the component is reusable without repair, has to be replaced, or in case of a repair, the choice of the best repair method. This requires model-based evaluations of the resulting functional properties, as well as the expenses of the different repair options. In order to show this, the high-pressure turbine blade (1st funding period) and the compressor blisk (2nd funding period) were chosen in the CRC 871, as the regeneration of both components is technically relevant and scientifically challenging. The effect of regeneration on the overall system, as well as the optimization of the developed regeneration processes will come to fore in the third funding period.The transfer of the gained scientific basics to other capital goods has already been demonstrated for electric transformers, gas turbines for power plants and wind turbines. This is done in the framework of DFG-funded transfer projects, as well as CRC-related projects with funding from the Federal Ministry of Economic Affairs or with funding direct from industry.