The paper presents a method for determining the operating costs of a transport system, calculated on average per unit of time and per transport vehicle. These costs were calculated from the perspective of the transport system owner, taking into account the operation process of the transport vehicles. Two methods for approximating these costs as a function of transport vehicle usage intensity are proposed. Lower estimates of profitable transport rates for external clients are presented, depending on the adopted method of setting the transport tariff. All considerations were carried out under the assumption of stationarity and the deterministic nature of transport processes.1. OPERATION OF TRANSPORT VEHICLES
The length of the time interval between the moment of purchasing a transport vehicle and introducing it into the system, and the moment of its replacement with a new vehicle, will be denoted by the symbol T and called the vehicle’s service life.
The symbol ϑ will denote the total length of time intervals during which the transport vehicle is in the technical maintenance system. When a transport vehicle is not undergoing technical maintenance, we say it is in use. The average total length of all time intervals of transport vehicle usage will be called the usage time and denoted by the symbol Θ. In that case:
T = Θ+ϑ The total lengths of time intervals when the transport vehicle is in states other than maintenance will be denoted by the following symbols:
Θ pr – working time of the vehicle, i.e., the length of all time intervals during which the transport vehicle is performing a transport task;
Θ doj – travel time, i.e., the length of all time intervals during which the transport vehicle is traveling to places from which a transport task will be performed, and returning to the place from which it will be directed to perform the next task;
Θ post – downtime, i.e., the length of all time intervals during which the transport vehicle is at the disposal of the transport system client but is not in motion, i.e., it has a stop ordered by that client;
Θ ocz – waiting time, i.e., the length of all time intervals during which the transport vehicle is waiting to undertake tasks ordered by the client. (…)
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Source: Logistyka Magazine