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Item type:Publication, Access status: with files , Modellierung der Termintreue im Auftragsdurchlauf(2020-12); Without question schedule reliability currently dominates amongst the logistic targets in operations management. High schedule reliability represents trustworthiness and has a positive impact on the corporate success. However, many companies struggle to achieve high schedule reliability. Schedule reliability is determined by two factors: backlog and sequence deviation. This work shows how sequencing can damp the effect of input sequence deviations. First, it is shown how the output sequence deviation can be modelled for one work station. The second step is to expand the model to a complex material flow with several workstations. An extensive simulation study investigates and verifies the high quality of the developed model. Finally, the application of the model at two different companies confirms its practicality.Publicationtype: Doctoral Thesis696 1961 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Extending Little’s Law to single order throughput times(2018-01-02); It has long been established that the mean throughput time is a result from the relationship between the work in process (WIP) and output rate. In reality, however, throughput times are frequently dispersed broadly around this mean. With the aid of a model originally developed for lateness, it is now possible to describe the throughput times of individual orders. Accordingly, the throughput time can be divided into two components: WIP-dependent throughput time and sequence-dependent throughput time.Publicationtype: Journal Article125 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , The surprising effectiveness of earliest operation due-date sequencingIn make-to order production, schedule reliability is very important but still not sufficiently accomplished in industrial practice by the vast majority of companies. It has been known for long that processing the orders at a workstation in the order of their operation due-dates can compensate for lateness in the arrival at the workstation within certain boundaries. The paper analyses the effectiveness of earliest operation due date (EODD) sequencing by comparing it to an optimistic theoretical boundary. The surprising result is that EODD can nearly fully exploit the theoretical potential. It should therefore be used in practice whenever schedule reliability is important, with only few exceptions. Its effectiveness though is increasing with the workstation’s WIP level and thus is in conflict with the objective to reduce WIP levels and throughput times. A simple forecasting model allows to assess the extent to which lateness can be compensated by EODD sequencing and which schedule compliance can be achieved.Publicationtype: Journal Article209 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Determining the potential to Improve schedule complianceHigh schedule compliance is very important but rarely achieved in make-to-order productions. Especially when orders are released too late (e. g. due to missing raw material) it is challenging to identify how many orders can still be produced in time. This paper shows how companies can identify their potential to increase schedule compliance by earliest operation due-date sequencing. The simple model shows that five parameters determine the potential to increase schedule compliance through sequencing: the input sequence deviation, the WIP level, the number of operations, planned sequence interchanges in the order throughput, and the number of parallel machines.Publicationtype: Journal ArticleScopus© Citations 2 295 320 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , 7