Introduction. Reducing fluctuations in the load transported by hoisting cranes with a flexible rope suspension of the load is an urgent task since it can significantly reduce the time taken to complete the operation of moving the load. A promising direction for reducing load fluctuations is to optimize the trajectory of movement of the load suspension upper point.

Materials and methods. The paper discussed the method of mathematical simulation of plane vibrations of a load moved by a crane with a horizontally moving suspension point, using the software of the MATLAB system. For modeling, the authors used the function of the MATLAB ode45 system, intended for the numerical solution of systems of non-stationary differential equations of arbitrary order.

The second-order differential equation used to describe the fluctuations of the transported load and its implementation in the form of program code was presented. Moreover, the authors demonstrated the elements of program code for the analysis and visualization of simulation results.

Results. The authors obtained and presented the series of graphs in the inclination angle’s changing of the cargo rope, the acceleration of the suspension point and the value of the objective function with the sinusoidal nature of the acceleration. The objective function was the sum of the absolute values of the deflection angle of the rope and the first derivative at the final moment of the suspension point’s movement with acceleration.

Discussion and conclusions. As a result, the paper shows that the system with energy dissipation does not reach the zero value of the objective function even by a symmetrical nature of acceleration and deceleration of the suspension point. Therefore, it is necessary to give asymmetry to the acceleration and deceleration periods of the suspension point in order to completely absorb the residual fluctuations of the load.

Introduction. Hole details are quite widely used in structures of construction and road machines. The specialists apply boring for draft, semi-fair, and in some cases for fair processing of such surfaces. This type of processing is often followed by the negative nature of oscillatory processes that leads to decrease in accuracy and in the surface quality. The paper studies the possibility of the calculation method’s usage in oscillatory processes, which allows assigning the cutting modes by providing required output parameters.

Materials and methods. The authors used the double-support beam as a design model of a boring cutter. The solution of the fluctuations’ modeling came down to definition of point movements, which corresponded to cutter top (points of application equally effective cutting forces). The authors made the definition of movements with use of Mor integrals. Therefore, the paper considered the impact of chip formation and separation due to perturbing forces.

Results. The authors carried out the calculation of forces’ values in cutting with use of the degree dependences. Moreover, the authors accepted the formation’s frequency as the frequency of the perturbing influenced structure. The frequency of the chip formation was defined on the basis of estimated dependences, which connected parameters of the tool, the cut-off layer and modes of cutting. As a result, the author received the implementations of oscillatory processes and studied the influence of different factors on vibration amplitude.

Discussion and conclusions. The authors make assessment of the received results’ adequacy by comparison with experimental data. The error doesn’t exceed 20%. The developed model considers geometrical parameters of the tool (a departure, plate corners, etc.), the modes of cutting both mechanical properties of the processed material and parameters of the chip formation. The model can be used both at design of boring operations and by optimization of the cutting modes for the purpose of productivity increase.

Introduction. Urban public transport plays an important role in modern cities. At the same time, the financial performance of public transport’s work is far from ideal. The purpose of the paper is to identify a promising area for increasing the payback of public urban passenger transport by application of different scientific methods.

Materials and methods. The paper demonstrated the significant statistical relationship between the route’s payback of public urban passenger transport and the indicators of using the capacity of passenger vehicles. Moreover, the author presented the average value of the passenger stress coefficient. The author also proposed to increase the payback of public urban passenger transport based on the use of variable-length electric buses (modular vehicles), which allowed more precise adjustment to the capacity of passenger traffic.

Results. Calculation examples showed that the use of modular passenger vehicles increased the public transport’s payback on 26%.

Discussion and conclusions. As a result, the presence of the electric bus modules’ fleet of the same capacity allows the carrier flexibly adapting the existing passenger flow capacity. Therefore, such measures increase the passenger stress coefficient, reduce the spread of its values relative to the average value and lead to the increase in the payback of public passenger transport. The author recommends to substantiate the capacity of the module, to develop technology for carrying passengers by modular vehicles and to formulate technical requirements for the module design in further research.

Introduction. Organization of high-quality training of the vehicles’ drivers is possible only with the proper formation of professional skills. Moreover, the formation of the skills is necessary for the driver to control the vehicle safety, perhaps by using simulators at the initial stage of training. The use of simulators allows automating the actions that the driver performs, while not exposing the student to risks.

Therefore, the purpose of the paper is to analyze the application of simulators in the training of the vehicles’ drivers.

Materials and methods. The paper presented the basic psycho physiological principles of the learning process, which should be taken into account when using simulators for driver training. The authors demonstrated the classification of the car simulators used for training of drivers by the information models. Existing information models of simulators were divided into two groups: reproducing only visual information, without imitation of the vestibular and simulating both visual and vestibular information. The analysis reflected the advantages and disadvantages of information models.

Results. As a result, the authors proposed two systematizing features: the view angle of the visual information and the simulation of vestibular information.

Discussion and conclusions. The research is useful not only for the further science development, but also for the selection of simulators and for the organization of the educational process in driving schools.

Introduction. Traction power of the car is used to determine its traction-speed properties. The purpose of the paper is the calculation refinement of the car traction power.

Materials and methods. The authors used the methodology of the refined calculation of the car traction power.

Results. The authors carried out the comparative analysis of the refined and traditional methods for calculating traction power. As a result, the authors obtained the refined equation for calculating the traction power, taking into account the elastic modulus, the width of the contact track, the free radius of the wheel, the deflection of the tire and the tangential friction forces in the contact zone. The largest discrepancy between the curve of the vehicle’s traction power calculated by the updated methodology and the curve of the vehicle’s traction power calculated by the traditional method was 26.8%.

Discussion and conclusions. The results of the research are useful to specialists of automobile and transport enterprises and masters of universities to compare the traction and speed properties of the various car types.

Introduction. Since the second half of the 20th century the safety in the automotive industry has been bringing to the forefront. Therefore, researches pay special attention to stability and controllability. These properties increase in a variety of ways, one of which is using of the four-wheel steering system (4WS). Foreign literature presents technical solutions on the example of sport cars and some Japanese models.

Materials and methods. The paper provided an analysis of the four-wheeled steering passenger car’s kinematics. The authors considered the turning geometry with positive and negative steering angles of rear axle, on the basis of which the researches proposed calculation formulas for determining the turning radius of the car and the angles of the wheels’ rotation. The kinematic relations used in designing a steering system with four steered wheels.

Results. The authors on the example of Volkswagen Polo calculated the turning radius and controllability depending on the steering wheels’ angles of the front and rear axles. As a result, the paper demonstrated the change in parameters and the effect on the safety and handling of the vehicle. The authors also highlighted the advantages of using a four-wheeled steering system.

Introduction. A significant proportion of the fuel pump’s faults is associated with an electric motor (about 40%), the technical condition of which is determined by the value of the electrical resistance of the winding circuit. However, direct measurement of electrical resistance without removing the vehicle is difficult. Therefore, it is possible to diagnose the performance of the electric motor (and the pump as a whole) by the amount of consumed current.

Materials and methods. The author used physical modeling of faults by adjustable resistance for acceleration of the experiment and establishment of precise limits in the efficiency of the electric motor. The criterion for the operability of an electric fuel pump was the value of the developed pressure of at least 0.25 MPa.

Results. An increase in the series-connected resistance led to a decrease in the current consumption of the pump, as well as a decrease in its performance. When the critical resistance value reached 11.2 ohms, the pump stopped working. A decrease in the resistance connected in parallel also led to a decrease in the current consumed by the pump since a significant part of it is bypassing of the electric motor through resistance. When the critical resistance value of 0.2 Ohm was reached, the pump stopped working.

Discussion and conclusions. As a result, the author develops the mathematical model of the electric motor’s efficiency, which allows determining its technical condition by the usage both the value of electrical resistance and the consumed current. Moreover, measuring the current consumed by an electric motor serves as the basis for diagnosing electric fuel pumps directly on a vehicle and reduces the labor intensity and downtime of vehicles under repair.

Introduction. An analysis of the most well-known agglomeration management models in Russia and abroad has shown that there are no comprehensive solutions in this area yet. The problem of information modeling of control actions on the state and development of the road network of these territorial entities is not well understood and requires further comprehensive research. The purpose of the paper is to formulate the most important principles and methodological approaches for building a modern information system for managing the road infrastructure of urban agglomerations.

Methods and models. The designed system based on information modeling technologies of transport interaction processes between corresponding points. The structure of the system presented on the principles of multi-agent project management. The authors identified the types of mathematical models for solving key problems in the framework of design modules by creation of an agglomeration transport framework, ensuring the regulatory requirements of the transport and operational condition of roads and by creation of conditions for the continuous and safe movement of road transport.

Results. The architecture of the “Road Network-6D BIM” developed system reflected the relations of two information processes: filling the system with knowledge and forming box solutions using a knowledge bank. The n-D modeling based on three-dimensional projections of structures (3-D) with the addition of digital modeling technologies: calendar terms, resources and financing of objects in the life cycle. The authors tested system elements during the experiment and the implementation of the project for the integrated development of the transport infrastructure of the Omsk agglomeration.

Discussion and conclusions. The implementation of the “Road Network-6D BIM” project in the proposed concept makes a definite contribution to solving the problems of managing the road network of the city agglomeration by increasing the level of intellectualization of the tasks at all stages of project management.

Introduction. The paper deals with the issues related to the implementation of the “quality” concept in the construction of reinforced concrete transport facilities linked with the scientific support during design and construction. Nowadays this problem particularly relevant in the context of the modern construction solutions, combined with the need to obtain the required properties of concrete structures and ensure the economic feasibility of construction. The aim of the research is to generalize and systematize the main methods and techniques of concrete works, which minimize the defects and cracks while the construction of transport infrastructure.

Materials and methods. On the example of different technologies used in the Russian construction over last 10 years, the authors demonstrated the developed methods of obtaining high quality concrete products taking into account tested and proved modern building materials.

Results. The results of the research formed the basis of the projects, technological regulations for the production, specifications and standards of organizations, guidelines. Moreover, the results also allowed implementing the concept of “quality” in transport construction based on obtaining defect-free reinforced concrete structures with specified properties, taking into account the use of modern building materials.

Discussion and conclusions. The research allows carrying out construction of various massiveness and extent. The obtained results form the basis of construction technology of other industrial and civil construction objects with reinforced concrete application. The paper is interesting and useful for specialists in providing defect-free construction of reinforced concrete building structures, for engineering and technical staff. The authors dedicate the research to the memory of Professor and Doctor of Technical Sciences, A.R. Solovyanchik (1938-2019).