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In the article, using the functional resonance analysis method, the process of traffic safety control of vehicles that carry out cargo delivery and transportation of passengers, when their technical condition changes during operation, is simulated. On the basis of statistical data, the reasons of the change of the technical condition of the chassis of the vehicles and their influence on its operational properties were analysed. Resilience Decision Support (Resilience DS) software is used to solve this problem. Such a tool made it possible to simulate the sociotechnical system "Person-Car-Organization of maintenance and repair system" and to form the formal models for constant evaluation of the effective functioning of the system of maintenance of vehicles and conditions of increasing their operation. To develop a maintenance model using a functional resonance analysis method, data was collected at a proprietary vehicle maintenance station. The model consists of a set of functions that determine the actions executed during maintenance of vehicles. The use of function-oriented technologies in a vehicle maintenance system allows simulation and maximizing overall operational parameters of vehicle due to local increase in technical capabilities and properties of individual elements, surfaces and/or zones of a part, depending on the functional features of operation.

Journal homepage: http://sjsutst.polsl.pl Article citation information: Sakno, O., Moysya, D.L. Kolesnikova, T. Dynamic stability of a model of a tractor-lorrytrailer combination.Summary. In this paper, we consider the mobility and stability of a model of a tractor-lorry-trailer combination, consisting of a two-axle tractor and a single-axle semi-trailer, and its possible stationary states with fixed steering. A feature of this research is the study of a non-linear mathematical model of a two-link tractorlorry-trailer combination. The set of steady-state conditions for the movement of the tractor-lorry-trailer combination model is determined on the basis of the developed mathematical model; it provides the necessary mobility for the passage of the circular overall traffic lane. The range of stable steady-state conditions of the road train is limited and the character of the loss of stability in the direct motion of the road train (divergent, flutter) is checked. The phase portraits of the system are constructed at different speeds, which allow us to estimate the range of attraction for direct motion. Stability issues are also considered, namely, the influence of the control parameters (θ, v) on stability or instability.

To estimate the effect of the axial movement of piston rings in the piston grooves on the blow-by in the internal combustion engine (ICE) by an experiment-calculated method. This contributes to the development of practical recommendations for the further improvement of the engine ring seal designs. Abstract theorems were used when modelling the effect of the axial movement of piston rings in the piston grooves on the blow-by in an ICE. They are based on the fundamental theory of heat engines, thermodynamics and hydraulics. The ICE running was analysed using design-theoretical research methods. The effect of the axial movement of piston rings in the piston grooves on the blow-by in the ICE was established. This creates prerequisites for a more accurate assessment of their sealing capacity and for ways to further improve them. Calculated dependences

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demonstrate the possibility of speedy compression ratio change in the engine with the MCRC. Calculation studies showed that the mechanism full operation occurs quickly (0.02 s per unit εx), which indicates the expediency of using such a highpressure pump in a four-stroke gasoline engine with CRCM. The mechanism movable body complete movement (S = 4 mm) at the oil temperature in the hydraulic system of 45°C and pressure on the body of p = 60 bar are stated to occur for 0.2 s.

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