Cycles of building tasks realization and required time buffers

Vol. 554 (10) 2018 / środa, 31 października, 2018

(InPolish)

A. Więckowski

DOI: 10.15199/33.2018.10.21

Volume 554: Issue 10
Pages 71-73
Accepted for publication: 29.08.2018 r.

The purpose of the article is to determine the scale of impacts of random durations of works on the change of cycles of implementation of entire tasks in the case of the use of the flow method (steady). The impact on timely execution of randomtasks of duration of individual works was analyzed. Using the probability calculus and numerical analysis methods, including Monte Carlo, cycles of task completion were examined. Network models of activities with determined structure and random times of processeswere used. In the example, in the case of large spreads in the execution times of individual processes (the relative standard deviation in the tested structure was as much as δσ = 41.2%), among others extending the task execution cycle by more than 11% compared to the result according to the classical model. Relative to the time of the expected execution of the EX process, the average downtime of one plot is more than 3 times greater. The averagewaiting period for a brigade per plot is approximately 0.2 working shift and constitutes 6.29% of the EX value. Keywords: evenly work; task cycles; modeling.
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dr hab. inż. Andrzej Więckowski, prof. AGH, Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie;Wydział Górnictwa i Geoinżynierii;

dr hab. inż. Andrzej Więckowski

awiecko@agh.edu.pl

Full paper is available at Publisher house SIGMA-NOT Sp. z o.o. webpage

DOI: 10.15199/33.2018.10.21