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2 Archives of Civil and Mechanical Engineering

2 2019

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Optimization of production process for resource utilization

Bozejko Wojciech, Burduk Anna, Pempera Jaroslaw, Wodecki Mieczysław

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 4

1251--1258

The paper presents a method of scheduling execution of technological operations in work centres in a company manufacturing seats for passenger cars. To that end, an optimization algorithm based on the B&B method was developed, aimed at minimizing the number of employees necessary for operation of the work centres and at maximizing capacity of the manufacturing process. Efficiency and effectiveness of the algorithm was verified on the grounds of real data coming from the manufacturing company.

Flowshop scheduling of construction processes with uncertain parameters

Bozejko Wojciech, Hejducki Zdzisław, Wodecki Mieczysław

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 1

194--204

In the paper a construction scheduling problem – namely flowshop – with minimizing the sum of penalties for exceeding the deadline of building structures completion is considered. The problem is illustrated by the investment task concerning the implementation of twelve apartment buildings forming a part of a new housing estate. Uncertain parameters of the system are represented either by fuzzy numbers or random variables, whereas random variables have normal or the Erlang distribution. Since even the deterministic version of the problem is strongly NP-hard, the approximate algorithm based on the tabu search method was used to its solution. The performed computational experiments showed large solution resistance against any potential interference of parameters of the problem.