SFB 871: Regeneration of Complex Capital Goods

CRC 871“复杂资本货物的再生”开发了维护复杂资本货物的科学基础。其目的是维护或修复整个系统中尽可能多的部件，从而使资本货物的功能特性得到“再生”，甚至得到改进。在CRC 871的第一个资助期内，商用涡轮风扇喷气发动机被选为应用实例，因为它们非常复杂。所涉及的工程学科在物理知识和这些复杂机器的设计方法方面都达到了目前的极限。一方面，这包括再生部件的功能性的计算验证，以及再生对技术和经济目标的影响的确定（在特定燃料消耗或部件的寿命方面）。另一方面，在材料科学和生产工程中也存在再生特定的挑战。CRC 871的创新方法超越了当前的技术和科学标准。除了改进单个再生过程外，还考虑了所有可能的行动方案，以进行基于规则的决策。根据组件的状况，该决策包括组件是否可重复使用而无需维修，是否必须更换，或者在维修的情况下，选择最佳维修方法。这需要基于模型的评估结果的功能特性，以及不同的维修方案的费用。为了证明这一点，CRC 871选择了高压涡轮机叶片（第一个资助期）和压气机整体叶盘（第二个资助期），因为这两个部件的再生在技术上是相关的，在科学上是具有挑战性的。再生对整个系统的影响以及再生工艺的优化将在第三个资助期内显现出来。将获得的科学基础转移到其他资本货物已经在电力变压器、发电厂的燃气轮机和风力涡轮机中得到了证明。这是在发展基金资助的转移项目以及与社区康复中心有关的项目的框架内进行的，这些项目由联邦经济事务部资助或直接由工业界资助。

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.