BazTech - Yadda

1

Predictive scheduling based on knowledge acquired from frequency of machine work disturbances

Wosik I., Skołud B.

Journal of Machine Engineering

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2011

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Vol. 11, No. 1-2

54--67

EN

During execution of a schedule some uncertain events may take place for example: resources may become unavailable, machine can be broken. Uncertainty should be included in the process of job scheduling. In the paper the problem to generate a workable, proactive baseline schedule under production constraints and unexpected event occurrence conditions is considered. The proactive baseline schedule protects against anticipated occurrences that may appear during the schedule execution. The machine breaking time is searched and the information is used to generate a robust schedule. In the paper the method of data acquisition basing on probability theory is proposed. The time of machine breaking is acquired from historical data of frequency of machine failure. A numerical example of building a hypothesis H:{the cumulative distribution function of the failure time is a normal distribution}, verification of the hypothesis, and predictive scheduling is presented. The normal distribution is proposed to describe failure time of machine as it gives consideration to a gradual wear process of the machine. The paper is proposition of improving simulation systems such as the Enterprise Dynamics or Taylor and scheduling systems such as Knowledge based Rescheduling System and Multi Objective Immune Scheduling Algorithm.

2

Rescheduling of arrivals and departures at multi-runway airports

Janik T., Łebkowski P.

Total Logistic Management

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2008

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no. 1

43-55

EN

The issues related to the changeability of the environment concerns primarily all the service and production systems. Proper selection of the control tools and their adjustment to the actual system operation conditions decide of the whole system effectiveness. This paper is an attempt at the development of an efficient tool supporting the control of the airplane arrivals and departures at the airports using more than one runways, with the application of the reactive approach.

PL

Problematyka zmienności otoczenia dotyczy wszystkich systemów usługowych i wytwórczych. Odpowiednie dobranie narzędzi sterowania i ich dostosowanie do rzeczywistych warunków funkcjonowania systemu decyduje o efektywności działania systemu. Niniejszy artykuł jest próbą opracowania skutecznego narzędzia wspomagającego sterowanie obsługą przylotów i odlotów samolotów w portach lotniczych z wieloma pasami startowymi przy wykorzystaniu podejścia reaktywnego.

3

Reactive scheduling in make-to-order manufacturing by mixed integer programming

Sawik T.

Zeszyty Naukowe. Automatyka / Politechnika Śląska

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2006

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z. 144

79-94

PL

W pracy przedstawiono nowe algorytmy reaktywnego harmonogramowania produkcji zamawianej, oparte na modelach programowania całkowitoliczbowego. Zamówienia mogą być modyfikowane przez odbiorców w całym horyzoncie planowania. Celem harmonogramowania jest minimalizacja liczby spóźnionych zamówień oraz łącznych zapasów materiałów i gotowych wyrobów. Zastosowanie proponowanych algorytmów ilustrują przykłady liczbowe zaczerpnięte z przemysłu elektronicznego oraz wyniki eksperymentów obliczeniowych.

EN

New algorithms based on mixed integer programming models are proposed for reactive scheduling in a dynamic, make-to-order manufacturing environment. The problem objective is to update production schedule subject to service level and inventory constraints, whenever customer orders are modified. Numerical examples modeled after a real-world production scheduling/rescheduling in the electronics industry are presented and some results of computational experiments are reported.