To increase fuel efficiency and reduce emissions of toxic components from exhaust gases of diesel engines, it is necessary to ensure accurate maintenance of the crankshaft speed. This function is assigned to the automatic engine speed control system. Currently, speed regulators operating on the Polzunov-Watt principle have become predominant in the engine industry. However, these regulators do not always provide the required indicators of static accuracy of speed control and dynamic parameters of the control process. The article examines the possibility of improving these indicators by using sequentially connected corrective links in the speed controller of a ZMZ 514 diesel engine (4 ChN 8,7/9,4). A corrective inertial-forcing link is considered as such a link. Using the SimInTech software package, calculations of transient processes of loading on an engine equipped with a standard speed controller and a regulator with a sequentially activated correction link were carried out. The optimization of the structure and parameters of the considered speed controller has been carried out.

The article presents the results of computational and experimental studies of acoustic impedance of the exhaust system of an internal combustion engine. The modern exhaust system consists of a "hot" and a "cold" part. The elements that are fixed to the engine and are part of it: the exhaust manifold, the turbocharger and the neutralization system are called the "hot" part. The second part, which contains elements to reduce exhaust noise (mufflers, resonators), is the "cold" part. Modern software allows to design the "cold" part with sufficient accuracy in a given geometry and in a given frequency range, but with the condition of accurately specifying the input parameters, namely, the amplitude spectrum of the input noise and the acoustic impedance of the noise source in the form of a motor with a "hot" part. The aim of the work is to obtain the most reliable acoustic output parameters of the "hot" part of an engine based on experimental studies on a non-motorized acoustic installation and computational studies by the finite element method using accurate 3D models of elements of the "hot" part.

his work is devoted to computational studies of the Helmholtz resonator tuning at low flow rates. The work was carried out in order to establish the effect of low-speed flow on the frequency tuning of the resonator and the possibility of further correct prediction of the operation of the developed muffler design when the engine is idling and low loads.

At the moment, there are a number of works devoted to tuning the natural frequency of the Helmholtz resonator in the presence of a high-speed gas dynamic flow.

This work is aimed at studying changes in the resonance frequency setting in the presence of low flow velocities.

At the present stage of internal combustion engine development, the application of supercharging allows to meet the requirements to the tractive characteristics of vehicles, to reduce or keep the weight and dimensions of the engine, to improve the economic performance, to reduce the emissions of carbon dioxide and toxic substances. For high boosting of internal combustion engines having the value of average effective pressure of 2.5 MPa, it is necessary to provide the degree of pressure increase πk = 4.5. The most rational way to achieve such πk is to use two-stage supercharging with intercooling. The advantage of such a system is the use of standard turbochargers in both stages. Together with two-stage supercharging the Miller cycle is used, which reduces the temperature of fresh charge due to early closing of the intake valve for 40...60 degrees of crankshaft rotation up to BDC.

The expansion of the range of blended fuels offered for use in diesel engines, obtained by additives of vegetable oils to diesel fuel, necessitates the determination of the thermophysical properties of these fuels, which affect the flow of the working process and engine performance. In particular, the fuel supply process is influenced by the amount of fuel compressibility. The compressibility value of mixed fuels with a given component ratio cannot be calculated from known values of this value for diesel fuel and vegetable oils and is determined experimentally. The paper describes a laboratory installation for determining the compressibility of mixed fuels and describes the proposed methodology for conducting experiments and processing their results. The experimental determination of the compressibility value is based on measuring the speed of sound in the fuel. In this study, the speed of sound was determined by recording the propagation of a pressure drop wave in the discharge pipeline when an controlled nozzle was opened. The method of processing the measurement results allows us to obtain a formula linking compressibility with pressure and the composition of the mixed fuel. The operability of the experimental setup and the applicability of the proposed technique is confirmed by comparing the compressibility values found for diesel fuel with known similar data obtained by other researchers

The presented article presents the results of the analysis of the possibility of using polymer composite materials to replace the metal part of the power structure of the cabin and subframe of a 17-ton road roller. Currently, polymer composite materials are widely used both in mechanical engineering and in the production of road construction machines, these materials are mainly used to manufacture parts of the plumage and lining of cabins, both internal and external, the proposed work considers the possibility of replacing the metal structure completely with a cabin structure made of polymer composite material using certain fillers that provide the required physical and mechanical properties under the established loads. When using polymer composite materials, certain advantages are provided, both technological and operational. Polymer materials will ensure a longer service life of such structures due to their high strength characteristics and chemical properties. For example, polymer composite materials are much less susceptible to corrosion wear and have a wider operating temperature range. To ensure these properties, a binder and filler were selected, their optimal proportions were calculated to obtain the required properties, and a 3D model of the cabin frame load structure was created. At the second stage, computer simulations of loads on “fops” and “rops” were carried out in a 3D design environment using the load values ​​provided in the technical regulations of the customs union. The results obtained confirm the rationality of using polymer composite materials in such load structures, which reliably ensure the preservation of the driver’s area without critical damage when the loads in question occur.

The article presents the results of a full-scale experiment on the study of the stress-strain state of the suspension of a self-propelled modular transporter (SPMT) when lifting and lowering a load using the method of electrical strain gauge. The aim of the study was to establish the dependence of the stress-strain state of the suspension on the load on the supporting surface along the axial lines and the vertical movement of the SPMT platform. The obtained dependencies of the change in stresses on the vertical movement of the SPMT platform and the load on the supporting surface along the axial lines constitute the scientific novelty of the study. The practical significance of the work lies in the fact that the information presented in the article can be used in the design of suspension elements of a self-propelled modular transporter and the creation of domestic analogues of SPMT.

The growth of the population in large cities and at the same time the growth of the car fleet causes traffic problems: congestion, violation of environmental standards. An intelligent transport system (ITS) using neural networks and artificial intelligence (AI) can reduce the load on the roads. The article contains ITS tools with examples of the results by them using in different megacities Singapore, London, Shanghai, Madrid and Moscow: machine learning and forecasting, smart traffic lights, loop sensors, computer vision, digital twins,  AI integration, 5G and Big Data, satellite positioning technologies (GLONASS, GPS), mobile applications. The results are shown: ITS, DCS reduce traffic jams by 30-50%, improve safety and quality of life, technologies pay off in 2-3 years by reducing economic losses.

The paper analyzes the necessity of categorization of expressway sections for the purposes of traffic safety prediction, conflict modeling and use in subsystems of intelligent transportation systems. The study identifies 5 types of sections: interchange, merge zone, deviation zone, consecutive merge zone, consecutive deviation zone, post-deviation zone before merge. The lengths of influence zones were determined for each type. The calculations were done in 3 different ways - based on driver information distance, the length of the transition speed lane zone, and by calculating the length of the speed gain/decrease and the realignment distance. The presented classification can be applied to any expressway, but if data are available, it is recommended to recalculate the length of influence zones based on the values of the section under consideration. It is planned to further use the results of the study for classification of street-road network sections, their analysis, prediction of conflict according to the presented types and implementation of this information in intelligent transportation systems to reduce the probability of traffic accidents.

The article discusses the methodology for developing a demand-responsive transport system aimed at improving the efficiency of urban passenger transportation. The architecture of the mobile application, algorithms for route optimization and demand forecasting, as well as integration with the existing transport infrastructure are described. The importance of using machine learning and data analysis to adapt the system to changing conditions is emphasized. The results of the study demonstrate the potential of the described system to improve the quality of transport services and reduce costs.

The article analyzes the transport industry and enterprises in this field regarding the level of readiness for digital transformation. The analysis showed that there is an uneven digital development in this area both among different regions of the country and among individual transport companies. The focus is on small trucking companies, which form the backbone of the industry and are experiencing the greatest difficulties in implementing digital technologies during the period of widespread digitalization. The importance of the role of the state in the implementation of digital transformation through the creation of conditions for the realization of digital potential is highlighted. It is concluded that digital transformation is a prerequisite for the development of small trucking companies and the industry as a whole. It is proposed to conduct a self-analysis of the enterprise in order to identify the level of its digital maturity for further selection of the most appropriate digital development strategy.

This article explores the organization of transport support for the supply of mobile medical complexes from Russia to the CIS countries. It examines key aspects of foreign economic activity, logistical challenges, and regulatory requirements associated with the transportation of medical devices. The paper includes examples of successful deliveries and provides recommendations for optimizing logistical processes. The research enhances the efficiency and sustainability of supplies, contributing to improved access to healthcare in CIS countries.

The National Park «Elk Island» (NP LO), located in the Moscow metropolis, experiences significant anthropogenic pressure from the population and land transport.  This article analyses the theoretical foundations of sustainable development of specially protected natural areas (SPNA) in the conditions of urbanisation, considering the key factors of anthropogenic pressure on the territory of «Losiny Ostrov». Based on the analysis of existing theoretical models and practical recommendations, a strategy to reduce the technogenic impact from traffic flows is proposed, aimed at preserving biodiversity and ecological integrity of the park.