Introduction. Currently, hydraulic equipment for telescopic boom equipment is widely used as working equipment for road, construction, hoisting-and-transport and mining machines. However, not all sides of the dynamic loading of the telescoping hydraulic cylinder have been studied. Research aim. The aim of the work is to study the loading of the telescoping hydraulic cylinder (MTC) taking into account the interaction with the telescopic boom during normalized rotation of the boom equipment and during subsidence of the supporting surface of the hoisting machine during the rotation of the working equipment. Methodology. To study the dynamic loading of the MTC, numerical modeling is carried out in the environment of the specialized Motion functional (complex dynamic and kinematic module) of the SolidWorks software package and the SolidWorks Simulation finite element calculation module. Results. The nature of the loading of the MCP elements was established: the time dependences of the angular displacements of the pistons, as well as the forces of counteraction of the shelves of the sections with the MTC, the walls of the sections with the trunnions of the MTC, the piston with the sleeve of the MTC in the horizontal and vertical planes were obtained. The diagram of the stress-strain state of the MCP under normalized and non-normalized loading is established. Design schemes for loading the section and the central heating circuit in the horizontal and vertical planes are developed. Conclusions. The results will improve the reliability of the MTC during operation, increase the reliability of the description of changes in the technical condition of the MTC, more reasonably determine the overhaul periods, and clarify the values of the diagnostic parameters, which contributes to the improvement of the system of maintenance and repair, as well as the design of the MTC.

Nowadays, self-propelled jib cranes equipped with telescopic jib equipment are widely used in construction, loading, unloading and installation works. Accidents of self-propelled jib cranes caused by a sudden break of a cargo rope, as well as spontaneous unloading of cargo, can be attributed to the main causes of accidents of hoisting cranes. This reason can be considered as one of the most dangerous, since sudden release of the load is characterized by unpredictability, independence from the skill of the operator and the transience of the impact. The aim of the work is to study the loading of telescopic boom equipment during sudden load removal and to propose measures to prevent or reduce the consequences of accidents caused by this type of loading. The railway crane “Sokol 80.01M” was selected as the object of study. The method of numerical experiment, carried out in the module of complex dynamic and kinematic analysis of SolidWorks Motion mechanisms was used as a research method. As a result of numerical simulation of instantaneous load removal, balancing of the telescopic boom on the sliding plates and shock interactions of the boom sections were established. The following parameters were determined: the time dependence of the sliding support reactions, the magnitude of shock interactions, and the time dependence of the boom head vibrations. It is proposed to use on a self-propelled jib cranes the “Method to increase the safety and security system of a jib crane”, which, in addition to protecting the crane from overload and from collisions of its boom or load-lifting body with various obstacles (coordinate protection), due to the presence of pyro-cartridges and their control subsystem, ensure the prevention of accidents in the event of a sudden removal of the load from the boom, as well as the protection of the hoisting machine when exposed to random external factors, damage reduction with irreversible loss of stability of the crane. The most rational parameters of the emergency power device for boom equipment were established: the time of action of the squib; the action coefficient of the squibs, the initial force of the squibs, the charge force of the emergency power device on the boom equipment.

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Introduction: Currently, mobile boom cranes equipped with telescopic boom equipment are widely used in construction, loading and unloading, as well as installation. Purpose of the study: We aimed to develop a dynamic model for a railway lifting crane, taking into account the interaction of its structural elements with each other and the bearing soil surface in a three-dimensional formulation. Methods: In the course of the study, we used Simulation and Motion modules of the SolidWorks software package, Klepikov’s non-linearly deformable soil model, and Lagrange’s equation of the second kind. Results: As a result, we developed a numerical analytical 3D model describing dynamic loading and deformation of the “mobile boom crane – foundation” system in a three-dimensional formulation. The model takes into account the following: the internal bending deformation and the interaction of the mating structural elements of a crane (telescopic sections, telescoping hydraulic cylinders, and outriggers), hoist rope rigidity, grillage (framework of sleepers) influence, elastic and plastic properties of the base platform soil, and action of inertial loads on the structural elements of the lifting crane.

Практические исследования стреловых самоходных кранов, находящихся в предельном состоянии, представляют значительные трудности, поэтому целесообразно применять компьютерное моделирование с использованием специализированных функционалов Simulation и Motion программного комплекса САПР SolidWorks и MATLAB. Разработана методика численного моделирования предельных состояний технического объекта на основе вейвлет-анализа колебательных процессов элементов конструкции в условиях ненормированного нагружения. Методика численного моделирования предельных состояний технического объекта состоит из следующей последовательности действий: геометрическое моделирование объекта, определение жесткостных характеристик конструкции, выполнение экспериментов на техническом объекте и виртуальном аналоге, обработка данных колебательного процесса и приведение динамических свойств виртуальной модели в соответствие прототипу путем получения сходимости их колебательных процессов. Для отладки созданной методики проведены исследования на физической модели объекта. Полученные результаты предоставляют возможность проводить дальнейшие численные эксперименты над виртуальной моделью технического объекта.Ключевые слова: численное моделирование, физическое моделирование, микроконтроллерная платформа Arduino Nano, стреловой самоходный кран There are significant difficulties in conducting practical studies of the limiting states of selfpropelled boom cranes, therefore it is advisable to use computer simulation with specialist Simulation and Motion functions of the CAD software SolidWorks and MATLAB. A technique is developed for the numerical simulation of limiting states of a technical object on the basis of wavelet analysis of oscillatory processes of structural elements under nonnormalized loading. The technique for the numerical simulation of the limiting states of a technical object consists of the following sequential actions: geometric modeling of the object, determining the rigidity properties of the structure, performing experiments on the