Economic due-date setting in job-shops based on routing and workload dependent flow time distribution functions

Article Abstract:

The trade-off between the length of the lead times quoted to the customers and the delivery reliability has been investigated by many authors. However, only a few studies do this in an economic setting. In this study, the setting of cost optimal due dates taking into account lead-time related and tardiness related costs is investigated. More specifically, in setting the internal due dates, which are used for determining the priorities on the shop floor, and in determining the expected order flow time probability density functions which are used for setting the external due dates, the work load is taken into account. From this study, it follows that this approach leads to (much) lower costs as compared to the situation with workload independent order flow time p.d.f.'s. Keywords: Lead times; Cost optimal; Delivery performance; Due date

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Optimal moves of the material handling system in a robotic cell

Article Abstract:

We consider the so-called robotic cells, i.e. flow-shops with a central robot that carries out the transfers of the parts between the machines. The objective is to describe the robot moves which optimize the throughput rate of a given product. In 1992, a conjecture about the optimal production rate was stated, referred to as the one-cycle conjecture. We shall give the state-of-the-art on this conjecture and add new results on specialized robotic cell arrangements. Keywords: Flow-shops; Material handling; Cyclic production; One-cycle conjecture; Performance factors

Robotics

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