## 6 Industrial Application of the Developed Approach
### Description of the Industrial Environment  
For the presented industrial application, only one network scenario is analyzed to keep the results within the scope of this publication. A summary of the input data for the considered strategic network scenario is shown in Figure 6.  
The European network footprint with the existing machining, assembly, and customer sites, including the supply relationships, is presented in Figure 6a. Customer-supplier relationships, product data such as the bill of materials (BOM), and the take rates (share of the total demand volume) for specific product variants are shown in Figure 6b. The production network footprint can be decomposed hierarchically into a set of customer-supplier  
Figure 6: Summary of input data to the solution space management approach; (**a**) footprint of the production network; (**b**) customer-supplier relationships and product data.  
relationships on different factory levels [44; 45]. The highest level of customer-supplier relationships is derived from the product structure, meaning that a _rotor_, a _stator_, and a _housing_ are supplied to an assembly line to assemble an electric motor, which is subsequently supplied to a customer (_Level_1_). The next level of customer-supplier relationships exists between production lines (_Level_2_).  
Moreover, the analyzed strategic scenario is also subject to a set of system constraints (_SC_) originating from the industrial environment. They are differentiated into organizational, production line, and miscellaneous constraints.  
The following organizational constraints need to be obeyed:  
* _SC01_: All sites operate in the same standard shift model, either 15 shifts/week or 10 shifts/week.
* _SC02_: Standard net working hours per shift vary by technology. Machining sites operate 8.0 h/shift, and assembly sites operate 7.2 h/shift. Furthermore, the following production line constraints need to be obeyed:
* _SC03_: The number of production lines for each component (_rotor_, _stator_, _housing_) and the product (_electrical engine_) is limited to two lines.
* _SC04_: The production line behavior only considers a worst case and a realistic case for the _rotor_ lines. The production line behavior for the _electrical engine_, the _stator_, and the _housing_ lines is fixed.
* _SC05_: The number of production lines for the _electric motor_ (two lines) and for the _housing_ (two lines) is fixed.
* _SC06_: The variant flexibility of production lines is set to full flexibility (all variants) if there is only one line. If there are two lines, variant flexibility is set to one full flexibility line and one high-runner line (defined for this application as variants with a take rate > 25%). In addition to these constraints, the following miscellaneous constraints must be obeyed:
* _SC07_: Supplier and customer production lines (_Level_2_) can be linked in either a 1:n or a 1:1 relationship. There is a decoupling buffer (warehouse) between each _Level_1_ customer-supplier relationship, but only the customer-supplier relationship between _rotor_, _stator_, _housing_, and _electric motor_ assembly lines is considered.
* _SC08_: The warehouses' inventory is only varied at two levels (low and high).
* _SC09_: Only two different product mix scenarios are considered (Pmix\({}_{1}\) and Pmix\({}_{2}\)).