Improving the technical and economic indicators of machine building is possible by increasing their production, reducing their dimensions and masses, reducing energy consumption and reducing their reliability, which ultimately will correspond to the norm for reducing construction time (putting objects into regulatory significant ones), the labor intensity of construction and installation works and increase in capital costs for temporary buildings and structures. A separate and specific type of machines for construction are drilling machines based on industrial tractors of the T10 type. As a rule, this uses a hydraulic volumetric drive of the main working bodies. The traditional design consequence of the drilling string drive of the machine is the use of a low-torque hydraulic motor with a gearbox. At the same time, high-torque hydraulic motors have grown in domestic industrial resistance, making it possible to provide the necessary torque on the drilling rig without using a gearbox. This solution allows you to simplify the light, reduce production costs and increase the reliability of the drive in operation. This article provides a comparative analysis of some of the advantages and disadvantages of the geared and gearless variants of the drilling string drive, in relation to the mass-produced machine BTS-150.

The paper considers approaches to modeling the dynamics of a mobile cable lifting machine, the working body of which is moved along a linearly extended cable using a winch. The mobile machine consists of two spatially spaced modules placed on the slope, and is secured by a cable car. A mathematical model has been developed that takes into account the vibrations of the working body on the traction and load-bearing ropes when it moves along the slope. Numerical integration of the equations of motion is carried out. The results are analyzed.

Tracked chassis are a common variant of the implementation of the movement mechanisms of hoisting-and-transport, construction, road machines, which has a number of advantages compared to rail-wheel, pneumatic-wheel and walking mechanisms, in particular, the absence of the need to equip work sites, as well as improved driving performance when moving over rough terrain. This article proposes an inversion approach to the traction calculation of a tracked chassis, which consists in presenting its traction and bearing element in the form of a closed loop, which makes it possible to apply the basic provisions of the theory of traction calculation of continuous transport machines to determine the resistance to movement and, accordingly, tensions in the contour of the track. The proposed approach makes it possible to estimate the contribution of various motion resistances to the total tractive effort during rectilinear motion, depending on the design features of each characteristic section of the track, taking into account the redistribution of the load between different tracks of the same chassis. The results obtained can be applied both in the design of classic special machines on a tracked chassis, and in the development of prototypes of tracked vehicles with displaced load application centers, in particular, tracked chassis of mobile transport and handling rope complexes.

Single-span ropeways based on autonomous self-propelled wheeled chassis of high load capacity and cross-country capability are a promising type of mobile transport and overloading equipment for the rapid creation of logistics infrastructure for the sustainable development of hard-to-reach areas with complex natural terrain. They can also be effectively used for rapid deployment during transport operations in the foci of natural or man-made disasters. This article presents a mathematical model of the operation of a hydraulic drive with throttle control with sequential activation of adjustable throttles and a power hydraulic cylinder in relation to the mechanism of installing the end tower on the load-bearing frame of a self-propelled wheeled chassis of a mobile ropeway. The model includes a submodel of kinematic and force analysis of the end tower installation mechanism and a submodel of hydrodynamic analysis of working processes in the volumetric pumping hydraulic drive of this mechanism. The established calculated dependences make it possible to simulate the change during the time of installation of the end tower from the transport position to the working position of the basic quantitative parameters, including the speeds and accelerations of movement of the end tower and the rod of the lifting hydraulic cylinder, pressures and volumetric flow rates of the working fluid at characteristic points of the hydraulic system.

Currently, due to a decrease in the volume of possible timber extraction in relatively convenient areas characterized by favorable natural relief, the development of logging technologies and appropriate logging equipment for work on steep slopes becomes an urgent technical and economic task. This paper discusses approaches to simulation modeling of work processes occurring in structural elements and systems of rope logging machines during their operation on steep slopes. The developed approaches can be used in the development of digital twins of logging equipment.

The quick-release devices of the ends of the carrying and traction ropes, which have the load capacity required by the tension condition of the rope system and a gentle mechanical effect on the structural elements of steel ropes, make it possible to ensure the rapid deployment and dismantling of mobile ropeways in the conditions of elimination of natural or man-made emergencies. The article discusses the design of the original device that provides a reliable and quick-release connection of the ends of the ropes, and also developed a mathematical model for predicting the load capacity of the specified device. The results of the analysis of the influence of the main design parameters of the connected ropes and fasteners of the device under consideration, as well as the mechanical deformation characteristics of steel ropes on the load capacity of the quick-release device are presented. The calculated dependences for the design of a quick-release device are proposed, taking into account the loading of the rope system during the operation of a mobile ropeway, as well as a methodology for selecting the existing standard size of the connecting device for the specified operating conditions.

The work is devoted to the issue of increasing the lateral stability, handling and safety of a car with a lever-electromagnetic system of transverse stabilization. The road safety of vehicles should improve with the rapid development of vehicle dynamics. Knowledge of vehicle roll stability data is important for the development of vehicle stability systems that will improve road safety. As a result of a review of trucks and passenger vehicles, it was found that the normal anti-roll bars are used to increase lateral stability. At present, higher-class passenger cars have begun to use active stabilizers (anti-roll bars), which provide more efficient alignment of the car when cornering. The main disadvantage of a conventional anti-roll bar is the reduction in suspension travel and does not provide the necessary smoothness when cornering and when maneuvering. These movements can lead to dangerous traffic situations. Thus, unfavorable driving conditions are manifested in terms of vehicle stability and controllability, as well as a smooth ride, which determines the level of comfort during heavy cornering and maneuvering. A new vehicle active safety system has been proposed, which makes it possible to increase lateral stability. The given method of substantiating the design and operating parameters of the lever-electromagnetic lateral stabilization system, which increase the lateral stability of light-duty vans, and the results of a study on the example of a GAZelle NEXT cargo van when cornering and maneuvering are given.

The issues of optimizing the parameters of a hydraulic hammer on the basis of differentiating a complex impulse system into subsystems by drawing up differential equations for all bodies participating in motion and using the theorem on changing the kinetic energy and momentum are considered. It has been established that the force of fluid pressure is the main source of friction in the sealing unit, the value of which depends on the pressure of the working medium, the coefficient of friction of the cuff material and the size of the contact surface of the seal. The research results can be used in the development of a method for calculating the optimal parameters when designing a hydraulic hammer, and the obtained expressions can be used to establish the influence of some parameters on the efficiency of the energy conversion process as a whole, as well as for other schemes and tasks.

In modern geopolitical conditions, the transportation of energy resources and, in particular, liquefied natural gas to the Kaliningrad region has acquired key importance. The existing infrastructure facilities and technical devices, in particular the underground gas storage «Kaliningrad» and the floating Storage Regasification Unit «Marshal Vasilevskiy», make it possible to overcome the current crisis in many ways. At the same time, it should underline that the implemented method of liquified natural gas transportation to the Kaliningrad region and its regasification has different drawbacks, as a result of natural losses and imperfections of technological solutions, part of the liquefied gas may be lost. The article presents the results of a study of the causes and preliminary projected volumes of losses of liquefied natural gas during its transportation by the floating Storage Regasification Unit «Marshal Vasilevskiy» from the port of Ust-Luga to the Romanovo underground gas storage with subsequent regasification and injection into underground reservoirs. The analysis of possible technical and technological solutions allowing to reduce the volume of losses and save the transported liquefied natural gas for subsequent use is carried out.