Browsing by Author "Skrzyniarz, M."

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    Setting Dynamic Problem of Logistic Support of Building Objects by Material Resources Taking into Account Random Factors Affecting Transportation Timing
    (Kaunas University of Technology, Kaunas, Lithuania, 2021) Arutiunian, Iryna; Radkevich, Anatolii V.; Kuznetsov, Valeriy; Kovalenko, M.; Skrzyniarz, M.
    ENG: This article considers deterministic (e.g. the exact time at which to deliver the goods, dimensions and characteristics of the vehicle, route length, waiting time in line, loading and unloading time) and non-deterministic factors (e.g. transport breakdowns; accidents; weather conditions; the time that the vehicle is at the consumer’s after unloading; downtime due to non-payment; breakdowns of machines and mechanisms; low-quality materials; delays in subcontractors) that affect the time of transportation and the time of the beginning of the use of material resources. Having identified the main deterministic and non-deterministic factors, it was made the analysis of existing models for solving the problems of organizing the provision of construction facilities with material resources without delays in time. It was determined that the existing models could not fully solve the problems associated with the peculiarities of the construction industry. The following factors are not taken into account: random factors that affect transportation, which increases the maximum cost, the specifics of the construction industry, which leads to inconsistencies, and as a consequence, the false results of the objective function. Schedules were drawn up for the supply of construction resources by the transport organization and the use of the resources mentioned by the construction organization, taking into account random factors that affect the time of transportation. By intersecting these two graphs, two main equations that affect the time of transportation and the time of commencement of material resources and the relationship between these equations were identified. Based on those equations, two target functions were drawn up, one of which takes into account the additional costs of the transportation organization logistics and the time for waiting for transporting, the other takes into account the additional costs of the construction organization for delays in starting work.