ResearchProject Area D
Subproject D1

Subproject D1 Modelling of regeneration processes

The individual composition and optimisation of regeneration processes presents a promising chance for regeneration service providers since a high logistics performance and concurrent low costs are significant for achieving the logistics goals successfully. Therefore, the superior objective of sub-project D1 is the increase of the logistics performance in regeneration processes by supporting the configuration of regeneration supply chains by means of a valuation model.

MOTIVATION AND OBJECTIVES

The regeneration supply chain describes the process of product regeneration starting with the disassembly of components. Additional pool stages can be added along the regeneration supply chain to open up further room for improvement.

Regeneration service suppliers are facing a variety of possibilities to configure their regeneration supply chains. Even though the configuration is to a certain extent defined by the capital good itself as well as by the essential technologies, there are various opportunities for improvement from a manufacturing logistics point of view, such as provision of capacity, scheduling and lot size determination methods and strategies of control and processing. Depending on the selected configuration of supply chains, the suppliers are able to provide a specific logistics performance. Customers apprehend those logistics performances via due date reliability and the offered lead-time. Although many approaches to describe cause-effect relationships concerning industrial supply chains do exist, there is no approach, which allows a continuous model-based description and, thus, an individual configuration of regeneration supply chains. To assure such a continuous description as well as a quantitative assessment of arbitrary and common regeneration supply chain configurations regarding logistics performance and logistics costs, a mathematical description of cause-effect relationships between adjustable data, control parameters and objectives needs to be facilitated. The developed assessment model allows additional insight into the quantitative effects of different supply chain configurations on feasible logistic goals as well as monetary objectives.

RESULTS

During the first funding period, optimisation approaches for capacity planning on a short-, mid- and long-term timescale based on Bayesian Networks were developed. Those enable precise prognoses concerning forthcoming regeneration orders and the resulting workload (based on e.g. usage data of capital goods). On that basis, first mathematical models to describe cause-effect relationships of design options, which are grounded on capacity and load balancing, and the resulting missing parts situation in reassembly, were developed during the second funding period. The focus was placed on a multistage process consisting of repair, pooling stage and reassembly. As a result, an assessment model was developed, which evaluates the missing parts situation in reassembly depending on the design options (selection of parts to keep in the pool as well as their quantity).

Over all three funding periods, subproject D1 focused on the logistical optimisation of regeneration processes within different scopes.

CURRENT RESEARCH AND OUTLOOK

To ensure a complete assessment of the supply chain configurations, the crucial process elements for the regeneration supply chain and their potential processing strategies as well as control procedures need to be made accessible during the third funding period. This includes e.g. disassembly procedures, additional pooling stages to improve the utilisation, alternative pooling strategies (determining the amount and the allocation of pooling components to the regeneration orders) and the diagnosis process. Subsequently, the consistent and model-based description allows the evaluation of the outcome concerning design and control changes of logistics performance and logistics costs without relying on time-consuming and application-related simulation studies. It also provides assertions about the process capability (supply chain structure and planning) and process reliability (controlling). This simplifies the derivation of goal-oriented measures for configuration, individual design and controlling of regeneration supply chains.


PUBLICATIONS

  • Kuprat, T.; Nyhuis, P. (2016) Designing Capacity Synchronization within the Regeneration of Complex Capital GoodsIn: Universal Journal of Management 2016 (4(10)), S. 581
    DOI: 10.13189/ujm.2016.041008
  • Eickemeyer, S. C.; Herde, F.; Irudayaraj, P.; Nyhuis, P. (2014) Decision models for capacity planning in a regeneration environmentInternational Journal of Production Research 52 (23), S. 7007–7026
    DOI: 10.1080/00207543.2014.923122
  • Eickemeyer, S. C.; Borcherding, T.; Schäfer, S.; Nyhuis, P. (2013) Validation of data fusion as a method for forecasting the regeneration workload for complex capital goodsProd. Eng. Res. Devel. 7 (2-3), S. 131–139
    DOI: 10.1007/s11740-013-0444-8
All publications of the Collaborative Research Centre

SUBPROJECT LEADER

Prof. Dr.-Ing. habil. Peter Nyhuis

STAFF

M. Sc. Torben Lucht
Address
An der Universität 2
30823 Garbsen
Address
An der Universität 2
30823 Garbsen
M. Sc. Tammo Heuer
Address
An der Universität 2
30823 Garbsen
Address
An der Universität 2
30823 Garbsen