Research Program of the Collaborative Research Centre (CRC) 871 Summary
The CRC 871 “Regeneration of Complex Capital Goods” (short: Product Regeneration) aims to develop scientific basics for the maintenance of complex capital goods in order to maintain or to “regenerated” as many components as possible of the respective total system, so that functional characteristics of the capital goods will be restored or even be improved.
New engineering methods and physical insights must be developed because the new challenges of the regeneration of used capital goods go beyond the challenges of the design and production of new products for the following reasons:
- The parts which have to be regenerated show, in contrast to conventional semi-finished products, a high variance in their functional and production-relevant characteristics because of aging and wear.
- The interaction of production processes with a function of a component is complicated because new as well as used components are used. Complex interactions must be considered during the choice of regeneration process steps, their simulation, and also in the modeling of the regenerated component’s function and total system performance.
The understanding of the influence of a single component’s functional characteristics on the characteristics of the whole capital good are used for the evaluation of individual regeneration steps and so serve the comprehensive control of the regeneration processes and their optimization. The control and optimization aims for the biggest benefit which can be derived given the business model of the customers and necessary safety criteria.
In our CRC only scientific approaches are pursued which are specific for the regeneration of complex capital goods in the regard explained above. Complex capital goods for the purpose of our CRC’s aim are those capital goods in which a high number of components are interacting in many functional ways. Therefore, functional interactions cannot be simplified by systematic design approaches such as modularization or functional separation or separation into assembly groups. For the regeneration, those complex functional interactions must be known and considered.
For the research in the CRC 871, aircraft engines have exemplarily been chosen, because of their high complexity. Within the components of the chosen capital good “aircraft engine”, those components will be treated in the subprojects whose complexity is notably high due to the diversity of functional requirements.
The choice of the topics of the subprojects conveys the engineering coherence of the CRC and facilitates an exchange of concrete data during the cooperation of the subprojects in place of a simple description of qualitative, hypothetic connections. Further complex capital goods which have a big impact on the German capital goods industry make similar methodic demands and benefit from the CRC’s approaches. The transfer of the findings to other complex capital goods (e.g. machine tools, wind turbines, printing machines, diesel-engine driven locomotives, heavy-duty gas turbines) will be initiated during the quarterly symposia and realized in transfer projects or bilateral projects with industry.
Inspection of a Complex Capital Good (source: MTU Aero Engines)