Simulation modeling of motion, statistical calculation and comparison of the characteristics of a transport vehicle equipped with an internal combustion engine and a combined power unit with a flywheel energy accumulator

Introduction. It is proposed to equip the vehicle with a mechanical transmission with a combined power unit (CPU) consisting of an internal combustion engine (ICE) and an auxiliary power source – a flywheel accumulator with a continuously variable adjustable drive.

The purpose of this study was: to assess the dynamic qualities and efficiency of a heavy-duty transport vehicle equipped with a mechanical transmission using the CPU; to determine the allowable level of power reduction for the main ICE; to calculate the range of the installation power of the flywheel energy accumulator (FEA) with a continuously variable adjustable drive and its average efficiency, as well as the required flywheel energy consumption during vehicle motion in different types of terrain.

Methodology and research methods. A universal method of simulation has been developed which took into account the statistical modeling of external disturbances acting on a transport vehicle equipped with a stepped gearbox and a conventional engine, or with a CPU containing an ICE and a FEA with a continuously variable drive for adjusting its gear ratio.

Scientific novelty and results. The characteristics of transport vehicles were compared with the help of the developed methodology according to the criterion of the average speed in motion along random routes. As a result, the efficiency of using the CPU was estimated. The influence of FEA on the energy consumption was estimated as well and the mathematical expectation of the continuously variable drive efficiency as part of CPU was determined. Also the magnitude of the original drive power on the average speed of the transport vehicle equipped with a mechanical transmission was established. The influence of the statistical characteristics of a random road (the expectation and dispersion of the resistance coefficient to the straight-line movement of the machine) was shown on the average speed increase of both the transport vehicle with CPU and the vehicle equipped with a conventional ICE. The influence of factors which limited the speed of a transport vehicle on the efficiency of using a FEA as part of CPU was established for various types of random runs.

Practical significance. The results obtained made it possible to compare and analyze the motion of machines equipped both with a conventional or CPU along random roads and externally influenced by the roads as well as to optimize the parameters of a conventional and combined power unit.

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