Assessing the performance efficiency of haul trucks and diesel-trolley trucks when changing their technological states and parameters of traffic routes

Abstract

Purpose. The research aims to assess the efficiency (performance) of haul trucks and diesel-trolley trucks, taking into account their technological states and parameters of traffic routes. Methods. The study of the technological states of dump trucks and diesel-trolley trucks was conducted using the mathematical apparatus of Markov random processes and the theory of road transportation with adaptation to quarry transport. Findings. The probabilities of vehicles being in each of the 12 (16) states and the performance of a haul truck and a dieseltrolley truck with a carrying capacity of 130 tons at the length of traffic routes from 1 to 5 km with the specific part of the trolley section from 30 to 70% have been found. The nonlinearity of the process of decreasing/increasing the relative importance of a particular component of the vehicle’s operating cycle has been determined, depending on the change in the route length and the share of the trolley section. Given the same technical service time for haul trucks and diesel-trolley trucks, the difference in movement velocity results in a change in travel time, which allows diesel-trolley trucks to perform up to 40% more transport work. On a 3 km route, which is the average transportation length in the Kryvyi Rih quarries, the performance of quarry transport increases from 13 to 36%, depending on the increase in the share of the trolley section from 30 to 70%. Originality. For the first time, a mathematical model of the probabilities of a diesel-trolley truck being in different technological states has been developed, which is used to determine the corresponding probabilities when changing the length of traffic routes and the share of the trolley section within them. Practical implications. The patterns revealed make it possible to determine the predicted reliability of operation, the probability of vehicles being in each of the states, and the productivity of using diesel-trolley trucks compared to dump trucks of similar carrying capacity under specified operating conditions. The use of diesel-trolley trucks can increase the performance of quarry road transport, with the best results observed on routes of maximum length with the longest trolley section.